Hydrophobic gel material for roadbed humidity control in high-cold areas and its preparation and application

Abstract

The present invention belongs to the field of cementitious materials, and relates to a hydrophobic gel material for regulating the humidity of roadbed in high-cold areas, and its preparation and application. The following steps are included: S1: clearing and compacting the surface layer of the foundation; S2: preparing a hydrophobic gel material; S3: mixing and laying the hydrophobic gel material with soil materials to form a first layer of hydrophobic improved roadbed; S4: continuing to lay plain soil on the surface of the hydrophobic improved roadbed; S5: laying a hydrophobic gel material on the top surface of the plain soil roadbed to form a second layer of hydrophobic improved roadbed; S6: continuing to lay a pavement structure on the surface of the second layer of hydrophobic improved roadbed. The present invention combines the lotus leaf bionic principle and polymer polymerization technology to lay the hydrophobic gel material in layers inside the roadbed, which can prevent capillary action and water infiltration while reinforcing the soil body, thereby avoiding the occurrence of highway diseases; it solves the problem of diseases caused by the influence of dry-wet cycles and freeze-thaw cycles during the service of highway roadbeds in high-cold areas.

Description

Technical Field

[0001] The invention belongs to the field of gelling materials, and particularly relates to a hydrophobic gel material for regulating humidity of roadbed in high-cold areas and its preparation and application. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Due to the influence of temperature and altitude changes, highway subgrade construction and operation and maintenance in high-altitude and cold regions face great challenges. The active depth of seasonal frozen soil along highways in high-altitude and cold regions is about 4m, and the bottom temperature is about -3.2℃-0℃. The freeze-thaw cycle has a strong impact on the subgrade. Under the combined action of capillary action and temperature gradient, the subgrade structure itself and the subgrade soil rich in capillary pores undergo water migration inside the subgrade, freeze to form flaky ice lenses, and the subgrade undergoes frost heave and separation. At the same time, after melting, it causes diseases such as water-rich mud on the subgrade. The freeze-thaw cycle of the subgrade has seriously affected the service life of regional roads and increased the cost of road maintenance. Traditional improvement methods mainly aim to improve the strength of the subgrade, and use methods such as filler improvement and construction optimization to improve it. However, the ecosystem in high-altitude and cold regions is sensitive and fragile. Once damaged, it will be extremely difficult to recover. Large-scale gravel replacement is difficult to avoid the impact on the surrounding environment.

[0004] Therefore, it is urgent to solve the problem of road subgrade diseases caused by dry-wet cycles and freeze-thaw cycles during service in high-altitude and cold regions. Summary of the invention

[0005] In order to solve the problem of diseases caused by dry-wet cycles and freeze-thaw cycles during the service of highway subgrades in high-cold areas, the present invention proposes a hydrophobic gel material for regulating the humidity of subgrades in high-cold areas and its application method. In the case of lack of materials such as stone for filling subgrades in high-cold areas, the present invention uses local materials to carry out research on reducing subgrade frost damage from the aspect of subgrade hydrophobicity, deeply analyzes the evolution mechanism of service performance damage of highway subgrades in high-cold areas, and proposes a technology for improving the service toughness of subgrades throughout their life cycle. The present invention combines the hydrophobicity of organic silicon materials with the adhesion of solid waste cementitious materials to improve the properties of roadbed soil. When the organic silicon material contacts soil particles, a super hydrophobic film is formed. The steel slag-based rock and soil curing agent makes the film and soil particles tightly connected to form a dense and stable structure, which can drain the water outside the roadbed when it tries to flow into the roadbed, thereby realizing the active regulation of "balanced humidity", which reduces the free water replenishment of the soil inside the roadbed, ensures that the regional roadbed is not affected by dry-wet cycles and freeze-thaw cycles, and at the same time improves the stability of the internal structure of the regional roadbed soil, so that the regional roadbed is always in a reasonable and healthy service state, thereby reducing the occurrence of regional highway diseases.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a hydrophobic gel material for regulating the humidity of roadbed in high-cold areas, which is composed of the following raw materials in parts by weight: 0.5-1 part of nano-type hydrophobic material, 90-95 parts of steel slag-based rock and soil curing agent;

[0008] 0.5-1 part of nano hydrophobic material, 90-95 parts of steel slag-based rock and soil curing agent;

[0009] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5-8 parts of sodium methyl silicate solution, 6-20 parts of silane modifier, 0.5-1 part of ethylene glycol, and 50-100 parts of nano silica sol;

[0010] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14-16 parts of steel slag powder, 5-7 parts of slag, and 7-9 parts of desulfurized gypsum.

[0011] Among them, the main component of sodium methyl silicate solution is sodium methyl silicate, which is an organic compound with the molecular formula CH5SiO3Na. It is a colorless liquid with a relative density of 1.23-1.26. It is a rigid building waterproof material with good permeability and crystallinity. The silanol group in its molecular structure can react with the silanol group in the silicate material to dehydrate and crosslink, thereby achieving the "reverse capillary effect" to form an excellent hydrophobic layer, and at the same time has the function of micro-expansion and increasing density. It is often used as a waterproofing agent for concrete, limestone, gypsum products, red bricks, sandstone, stucco, plaster, bricks and tiles and other materials.

[0012] Silane modifiers are organic compounds containing silicon bonds. Their molecular structure contains active groups at one end, which can react chemically with the active groups on the surface of the material, combining the silane molecules with the surface of the material to form a chemical bond. At the other end, it contains hydrophobic groups, which can change the hydrophobicity of the surface of the material, thereby affecting the properties of the material.

[0013] The modification principle of silane modifier is: silane modifier can improve the water resistance, high temperature resistance and wear resistance of materials by forming a hydrophobic layer on the surface of the material. Silane modifier is widely used in the fields of building materials, plastics, rubber, coatings, etc. In the field of building materials, silane modifier can be used to improve the impermeability of cement, reduce cracking and improve durability.

[0014] Ethylene glycol is also known as glycol and 1,2-ethylene glycol. Its chemical formula is (CH2OH)2, and it is the simplest diol. Ethylene glycol is a colorless, odorless, sweet-tasting liquid with low toxicity to animals. Ethylene glycol is miscible with water and acetone, but has a low solubility in ethers. It is used as a solvent and antifreeze.

[0015] The principle of action of ethylene glycol in antifreeze is mainly based on: ethylene glycol has the property of lowering the freezing point temperature of water. By mixing with water, ethylene glycol can lower the temperature required for water to transform from liquid to solid, thereby preventing water from freezing at low temperatures. Specifically, ethylene glycol interacts with water, reducing the degree of freedom of water, making it more difficult to form ice crystals. For example, a 20% ethylene glycol solution can lower the freezing point temperature of water to -9°C, while a 30% v / v ethylene glycol solution can lower the freezing point temperature of water to -20°C. When the content of ethylene glycol is 68% v / v, the freezing point can be lowered to -68°C.

[0016] Nano silica sol is a colloidal solution, odorless and non-toxic. Silica sol is a dispersion of nano-scale silicon dioxide particles in water or solvent. SiO2 (silicon dioxide) in silica sol contains a large amount of water and hydroxyl groups. There are different ways to prepare silica sol. The most commonly used methods are ion exchange, one-step hydrolysis of silicon powder, silane hydrolysis, etc. Silica sol has the characteristics of a certain amount of film-forming dissolution, and its water resistance and heat resistance are significantly better than organic coatings. The coating film is dense and hard, does not generate static electricity, and various dust in the air is difficult to adhere. The fine particles in nano silica sol have a strong penetration force on the base layer, can penetrate into the base layer through capillaries, and can react with calcium hydroxide in the concrete base layer to form calcium silicate, which has a strong bonding force.

[0017] The steel slag-based rock and soil solidifying agent of the present invention is a fully solid waste cementitious material. Among them, steel slag is a by-product in the steelmaking process. It is composed of various oxides formed by oxidation of impurities such as silicon, manganese, phosphorus, and sulfur in pig iron during the smelting process, and salts generated by the reaction of these oxides with solvents. Steel slag contains a variety of useful components (in mass percentage): 2%-8% metallic iron, 40%-60% calcium oxide, 3%-10% magnesium oxide, and 1%-8% manganese oxide, so it can be used as a raw material for steel metallurgy. The mineral composition of steel slag is mainly tricalcium silicate, followed by dicalcium silicate, dicalcium ferrite and free calcium oxide. Steel slag is clinker, a remelting phase, and has a low melting temperature. When remelted, the liquid phase is formed early and has good fluidity. Steel slag is divided into electric furnace slag, open-hearth slag and converter slag.

[0018] Through fine grinding, the activity of industrial waste slag is improved and it is added as a concrete admixture into the sixth component of concrete - mineral fine admixture. Fine grinding not only reduces the particle size of slag powder, increases its specific surface area, and further hydrates the f-CaO (free calcium oxide) in the slag powder to improve the stability of the slag powder, but also changes the lattice structure and surface physical and chemical properties of the steel slag, converting the grinding energy into the internal energy and surface energy of the slag powder, thereby improving the cementitious properties of the steel slag.

[0019] Slag is a by-product of the blast furnace ironmaking process. During the ironmaking process, iron oxide is reduced to metallic iron at high temperatures, and impurities such as silicon dioxide and aluminum oxide in the iron ore react with lime and other substances to form a molten material with silicates and aluminosilicates as the main components. After quenching, it becomes a loose, porous granular material, which is blast furnace slag, or slag for short.

[0020] The chemical composition of slag includes oxides such as CaO (calcium oxide), SiO2, Al2O3 (aluminum oxide), MgO (magnesium oxide), MnO (manganese oxide), Fe2O3 (iron oxide) and a small amount of sulfides such as CaS (calcium sulfide) and MnS (manganese sulfide). Generally speaking, the content of CaO, SiO2 and Al2O3 accounts for more than 90%. The chemical composition of slag is basically the same as that of cement, except that the CaO content is lower and the SiO2 content is higher. In addition, alkaline slag with a higher CaO content also contains components such as dicalcium silicate, so the slag itself has weak hydraulic properties.

[0021] Desulfurized gypsum is also called flue gas desulfurized gypsum and sulfur gypsum. Its main component is the same as natural gypsum, which is CaSO4·2H2O (calcium sulfate dihydrate), with a content of ≥93wt%. Desulfurized gypsum is a byproduct of the FGD (flue gas desulfurization) process. The FGD process is a technology that uses lime-limestone to recover sulfur dioxide from flue gas from coal or oil combustion. This technology is to grind lime-limestone into slurry, and pass the dust-removed flue gas containing SO2 (sulfur dioxide) through a slurry scrubber to remove SO2. The lime slurry reacts with SO2 to produce calcium sulfate and calcium sulfite. Calcium sulfite is oxidized to calcium sulfate to obtain industrial byproduct gypsum, called desulfurized gypsum, which is widely used in building materials and other industries.

[0022] The difference between desulfurized gypsum powder and general gypsum powder lies in the difference in physical composition. Desulfurized gypsum powder also contains silicon dioxide, sodium oxide, calcium carbonate, calcium sulfite, limestone, calcium chloride, magnesium chloride, etc. Compared with other gypsum powders, desulfurized gypsum powder has the characteristics of being renewable, small in particle size, stable in composition, less in harmful impurities, and high in purity.

[0023] Based on the above-mentioned nano-hydrophobic material and steel slag-based rock and soil curing agent, the present invention also explores the components such as silane modifiers required in the hydrophobic cementitious material. It has been verified that the silane modifier is a mixture of heptadecafluorodecyltrimethoxysilane and dimethyldichlorosilane. When the mass ratio of the two is 1-5:5-15, the hydrophobicity of the hydrophobic cementitious material is significantly improved, resulting in a synergistic effect.

[0024] In order to provide a stable sodium methyl silicate solution, the present invention studies a method for preparing the sodium methyl silicate solution. Preferably, the method for preparing the sodium methyl silicate solution comprises:

[0025] Dissolving sodium silicate in water to hydrolyze it to obtain a sodium silicate solution;

[0026] The sodium silicate solution is mixed with methanol, and heated to 90° C.-95° C. for reaction. After the reaction is completed, water is added, and the mixture is filtered to obtain the product.

[0027] Sodium silicate, commonly known as sodium silicate, is an inorganic substance with the chemical formula Na2O·nSiO2. Its aqueous solution is commonly known as water glass and is a mineral binder. It is a soluble inorganic silicate with a wide range of uses.

[0028] According to the physical state, it can be divided into two categories: liquid sodium silicate and solid sodium silicate. Liquid sodium silicate is distinguished according to the different ratios of quartz sand and alkali and the different types of alkali. It appears as a viscous liquid, and the colors of different brands are significantly different, ranging from colorless to gray-black. Solid sodium silicate is an intermediate product, and most of it appears light blue. Na2O·nSiO2 formed by dry casting is blocky and transparent, while Na2O·nSiO2 formed by wet water quenching is granular and can only be used after being converted into liquid Na2O·nSiO2.

[0029] Methanol, also known as hydroxymethane, wood alcohol or wood spirit, is an organic compound and the simplest saturated monohydric alcohol with a chemical formula of CH3OH / CH4O. The molecular weight is 32.04 and the boiling point is 64.7℃. Methanol is also known as "wood alcohol" and "wood spirit". Methanol is very light, highly volatile, colorless, flammable, and has a very similar smell to ethanol (drinking wine). However, unlike ethanol, methanol is highly toxic and cannot be drunk. It is usually used as a solvent, antifreeze, fuel or ethanol denaturant, and can also be used to produce biodiesel through ester exchange reaction.

[0030] In order to provide a sodium methyl silicate solution, the present invention explores the ratio of the sodium silicate to methanol. Preferably, the mass ratio of the sodium silicate to methanol is 1-2:4.

[0031] In order to provide a stable nano-silica sol, the present invention studies a preparation method of the nano-silica sol. Preferably, the preparation method of the nano-silica sol comprises:

[0032] The elemental silicon is subjected to a hydration reaction with water in the presence of sodium hydroxide, and after the reaction is completed, the silicon is allowed to stand for a treatment and filtered to obtain the silicon.

[0033] Silicon is a chemical element with the chemical symbol Si. Its atomic number is 14 and its relative atomic mass is 28.0855. It is a hard and brittle crystalline solid, a tetravalent metalloid and a semiconductor. There are two allotropes of silicon, amorphous silicon and crystalline silicon. It belongs to the third period of the periodic table, the metalloid element of group IVA.

[0034] Silicon is also a very common element. In nature, it is usually in the form of complex silicates or silicon dioxide, widely found in rocks, gravel, and dust. Silicon ranks eighth in the universe in terms of reserves. It is widely distributed in dust, sand, planets, and planets in various forms of silicon dioxide (silicates) or silicates. More than 90% of the earth's crust is silicate minerals, making silicon the second most abundant element in the earth's crust (about 28% by mass), second only to oxygen.

[0035] Sodium hydroxide, also known as caustic soda, caustic soda, caustic soda, and flake caustic soda, is an inorganic compound with the chemical formula NaOH and a relative molecular weight of 39.9970.

[0036] Sodium hydroxide is highly alkaline and corrosive. It can be used as an acid neutralizer, complex masking agent, precipitant, precipitation masking agent, color developer, saponifier, peeling agent, detergent, etc. It has a wide range of uses.

[0037] In order to provide a nano-silica sol, the present invention further explores the ratio of the elemental silicon, sodium hydroxide and water. Preferably, the mass ratio of the elemental silicon, sodium hydroxide and water is 5-10:10-20:20-30.

[0038] The second aspect of the present invention provides a method for preparing the hydrophobic gel material for controlling the humidity of roadbed in high-cold areas, comprising:

[0039] The sodium methyl silicate solution, the silane modifier, ethylene glycol and the nano-silica sol are mixed evenly to obtain a nano-type hydrophobic material;

[0040] The steel slag powder, slag and desulfurized gypsum are mixed evenly to obtain a steel slag-based rock and soil solidifying agent;

[0041] The nanometer hydrophobic material is mixed evenly with the steel slag-based rock soil solidifying agent to obtain the solidified material.

[0042] The present invention has been verified by multiple tests and has shown that: when the hydrophobic cementitious material prepared by the above method comes into contact with soil particles, a super hydrophobic film is formed, and the steel slag-based rock and soil curing agent makes the film and soil particles closely connected to form a dense and stable structure. The dense and stable structure can not only reduce the downward seepage of the road surface, but also reduce the capillary water rise at the bottom of the roadbed; thereby, the internal moisture content of the regional roadbed is effectively controlled, thereby improving the effective stress of the regional roadbed and the service life of the road.

[0043] The present invention also studies the mixing method of the above components. Preferably, the sodium methyl silicate solution, silane modifier, ethylene glycol and nano silica sol are mixed under stirring.

[0044] In order to further improve the hydrophobic effect of the hydrophobic gelling material, the present invention studies the stirring speed. Preferably, the stirring speed is 100 r / min-200 r / min.

[0045] In order to further improve the hydrophobic effect of the hydrophobic gelling material, the present invention studies the stirring time. Preferably, the stirring time is 10 min-15 min.

[0046] In order to further improve the hydrophobic effect of the hydrophobic gelling material, the present invention studies the particle size of the steel slag powder. Preferably, the particle size of the steel slag powder ranges from 1 μm to 100 μm.

[0047] In order to further improve the hydrophobic effect of the hydrophobic cementitious material, the present invention studies the particle size of slag. Preferably, the particle size of the slag is in the range of 1 μm to 100 μm.

[0048] In order to further improve the hydrophobic effect of the hydrophobic gelling material, the present invention studies the particle size of the desulfurized gypsum. Preferably, the particle size of the desulfurized gypsum is in the range of 1 μm to 100 μm.

[0049] In order to further improve the hydrophobic effect of the hydrophobic gelling material, the present invention studies the preparation method of the silane modifier. Preferably, the preparation method of the silane modifier comprises: uniformly mixing heptadecafluorodecyltrimethoxysilane and dimethyldichlorosilane to obtain.

[0050] In view of the sensitive and fragile ecosystem in high-altitude cold regions, it is extremely difficult to recover once it is destroyed, and it is difficult to avoid the impact on the surrounding environment by replacing large-scale gravel. In a third aspect, the present invention provides an application of the above-mentioned hydrophobic gel material for regulating the humidity of the roadbed in high-altitude cold regions in roadbed construction, including:

[0051] Clear and compact the surface of the foundation;

[0052] The hydrophobic gel material for controlling the humidity of the roadbed in the high-cold region is mixed with soil material to form a hydrophobic gelling material modified soil material;

[0053] The roadbed is laid in layers, and when the first layer of roadbed soil is filled, the hydrophobic cementitious material modified soil material is used for laying, and after the laying is completed, the soil material is compacted to obtain the first layer of hydrophobic improved roadbed;

[0054] Continue to lay soil material on the upper part of the first layer of hydrophobic improved roadbed, and compact it until it is laid to the designed roadbed height to obtain the soil material roadbed;

[0055] Laying the hydrophobic cementitious material modified soil material on the top surface of the soil roadbed and compacting it to form a second layer of hydrophobic improved roadbed;

[0056] After the highway slope is brushed, the hydrophobic cementitious material modified soil is laid and compacted to obtain a complete hydrophobic roadbed structure.

[0057] In order to better improve the active control capability of roadbed moisture balance in high-cold areas, the present invention studies the dosage of hydrophobic gelling materials. Preferably, the dosage of the hydrophobic gelling materials for controlling the moisture balance of roadbed in high-cold areas is 1%-3% of the soil mass.

[0058] In order to better improve the active control capability of balanced humidity of roadbed in high-cold areas, the present invention studies the laying thickness of the first layer of hydrophobic improved roadbed. Preferably, the laying thickness of the first layer of hydrophobic improved roadbed is 10cm-20cm.

[0059] In order to better improve the active control ability of roadbed balanced humidity in high-cold areas, the present invention studies the compaction time interval of the first layer of hydrophobic improved roadbed. Preferably, during the laying process of the first layer of hydrophobic improved roadbed, compaction is carried out at an interval of 1-1.5 days after the laying is completed to ensure that the hydrophobic improved roadbed raw materials fully react with the roadbed soil.

[0060] In order to better improve the active control capability of the roadbed balanced humidity in high-cold areas, the present invention studies the laying thickness of the second layer of hydrophobic improved roadbed. Preferably, the laying thickness of the second layer of hydrophobic improved roadbed is 10cm-20cm.

[0061] In order to better improve the active control ability of roadbed balanced moisture in high-cold areas, the present invention studies the compaction time interval of the first layer of hydrophobic improved roadbed. Preferably, during the laying process of the second layer of hydrophobic improved roadbed, compaction is carried out after 2-2.5 days of laying.

[0062] Beneficial effects of the present invention

[0063] (1) The nano-type super-hydrophobic material prepared by the present invention forms a super-hydrophobic film when in contact with soil particles, and the steel slag-based rock soil curing agent makes the film and soil particles closely connected to form a dense and stable structure. The water contact angle of the prepared nano-hydrophobic material is 145.6°. The dense and stable structure can not only reduce the downward seepage of the road surface, but also reduce the capillary water rise at the bottom of the roadbed; thereby effectively controlling the internal moisture content of the regional roadbed, thereby increasing the effective stress of the regional roadbed and the service life of the road.

[0064] (2) The present invention closely connects the roadbed soil with the hydrophilic groups in the organosilicon. At this time, the hydrophobic groups in the organosilicon face outward, forming a methyl-based phase interface, which produces a hydrophobic effect, thereby achieving effective hydrophobicity on the surface of the roadbed soil, ensuring the fluctuation range of the moisture content inside the roadbed, and thus effectively avoiding road cracking caused by shrinkage of the roadbed soil and diseases caused by dry-wet cycles, thereby improving the main bearing capacity of the roadbed during service;

[0065] (3) The present invention combines the hydrophobic properties of silicone materials with the adhesive properties of solid waste cementitious materials to improve the properties of roadbed soil. It can drain away moisture from the outside of the roadbed when it attempts to flow into the roadbed, thereby reducing the free water supply to the soil inside the roadbed, ensuring that the regional roadbed is not affected by dry-wet cycles and freeze-thaw cycles. At the same time, it improves the stability of the internal structure of the regional roadbed soil, so that the regional roadbed is always in a reasonable and healthy service state, thereby reducing the occurrence of regional highway diseases.

[0066] (4) The preparation method of the present invention is simple, practical and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the exemplary embodiments of the present invention and their description are used to explain the present invention, and do not constitute improper limitations on the present invention.

[0068] Figure 1 The present invention is a flow chart of the hydrophobic gel material construction method for controlling roadbed humidity in high-cold areas.

[0069] Figure 2 Schematic diagram of the drainage roadbed paving structure; 1. Drainage roadbed, 2. Bare soil roadbed.

[0070] Figure 3 It is the contact angle of the soil surface after adding the hydrophobic gel material in Example 1 of the present invention. DETAILED DESCRIPTION

[0071] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0072] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those of ordinary skill in the art. The terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0073] Regarding the use of “the”: Unless the context clearly indicates otherwise, the singular forms “a”, “an” and “the” as used herein are intended to include the plural forms as well.

[0074] All numerical designations, such as pH, temperature, time, concentration, amount and molecular weight, including ranges, are approximate and may vary by (+) or (-) increments of 0.1 or 1.0 where appropriate. It will be understood that all numerical designations may be preceded by the term "about", although this is not always expressly stated.

[0075] Regarding "range statements": As will be understood by those skilled in the art, for any and all purposes, particularly in terms of providing a written description, all ranges disclosed herein also encompass any and all possible subranges and combinations of subranges thereof. Any listed range can be readily identified as fully described, and the same range can be broken down into at least equal halves, thirds, quarters, fifths, tenths, etc. As a non-limiting example, each range discussed herein can be readily broken down into a lower third, a middle third, an upper third, etc.

[0076] Those skilled in the art will also understand that all language, such as "at most," "at least," "greater than," "less than," etc., are inclusive of the recited numbers and refer to ranges that can subsequently be subdivided into the sub-ranges discussed above.

[0077] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0078] Terminology explanation:

[0079] "Active regulation of balanced roadbed humidity" means that when water invades the roadbed, the improved roadbed has a waterproof function, which can actively resist the invasion of water and maintain the balanced humidity of the roadbed.

[0080] The present invention will be further described in detail below in conjunction with specific embodiments. It should be noted that the specific embodiments are intended to explain the present invention rather than to limit it.

[0081] In the following examples, all raw materials and reagents are commercially available products.

[0082] Example 1

[0083] A hydrophobic gel material for regulating the humidity of roadbed in high-cold areas and a preparation method thereof, wherein the hydrophobic gelling material is composed of the following raw materials in parts by weight: 0.5 parts of nano hydrophobic material and 90 parts of steel slag-based rock and soil curing agent.

[0084] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5 parts of sodium methyl silicate solution, 1 part of heptadecafluorodecyltrimethoxysilane, 5 parts of dimethyldichlorosilane, 0.5 parts of ethylene glycol, and 50 parts of nano silica sol;

[0085] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14 parts of steel slag powder, 5 parts of slag, and 7 parts of desulfurized gypsum.

[0086] The preparation method comprises:

[0087] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0088] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a mass ratio of sodium silicate to methanol of 1:4, and heated to 95° C. for reaction. After the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0089] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 5:10:30. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0090] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9 during the mixing process to obtain a nano-hydrophobic material.

[0091] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0092] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0093] Example 2

[0094] like Figure 1 , Figure 2 As shown, a construction method of a hydrophobic gel material for controlling the humidity of a roadbed in a high-cold region comprises the following steps:

[0095] S1: Clear and compact the surface of the foundation;

[0096] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0097] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0098] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level. When the groundwater supply is sufficient, the dosage of the nano hydrophobic cementitious material is 3wt%, and in other cases, the dosage can be controlled at 1wt%.

[0099] S5: compact the roadbed with hydrophobic cementitious material modified soil according to the construction specifications. When the groundwater supply is sufficient, the laying thickness is 20 cm, and the laying thickness is 10 cm under other working conditions, forming the first layer of hydrophobic improved roadbed, which mainly prevents capillary action at the bottom of the roadbed in high-cold areas;

[0100] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it is laid to the designed height of the roadbed to form a plain soil roadbed 2;

[0101] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5. When the rainfall in the area is large, the laying thickness is designed to be 20 cm. When the rainfall is small, the laying thickness is 10 cm, forming a second layer of hydrophobic improved roadbed;

[0102] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0103] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete drainage roadbed 1 is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0104] In this embodiment, in step S2, the area is ordinary frozen soil, and the hydrophobic gelling material prepared in Example 1 is used.

[0105] In step S4, the amount of the hydrophobic gelling material is selected to be 3%.

[0106] In this embodiment, the laying thickness in step S5 is 20 cm.

[0107] In step S5, after laying the first hydrophobic improved roadbed, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0108] In this embodiment, the laying thickness in step S7 is 20 cm.

[0109] In step S7, hydrophobic improved roadbed material is laid on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and then proceed to step S8.

[0110] Example 3

[0111] A hydrophobic gel material for regulating the humidity of roadbed in high-cold areas and a preparation method thereof, wherein the hydrophobic gelling material is composed of the following raw materials in parts by weight: 1 part of nano-type hydrophobic material and 92.5 parts of steel slag-based rock and soil curing agent.

[0112] The nano hydrophobic material is composed of the following raw materials in parts by weight: 7.5 parts of sodium methyl silicate solution, 3 parts of heptadecafluorodecyltrimethoxysilane, 12.5 parts of dimethyldichlorosilane, 1 part of ethylene glycol, and 100 parts of nano silica sol;

[0113] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 16 parts of steel slag powder, 7 parts of slag, and 9 parts of desulfurized gypsum.

[0114] The preparation method comprises:

[0115] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0116] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a sodium silicate to methanol mass ratio of 2.5:4, heated to 95° C. for reaction, and after the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0117] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 10:20:25. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0118] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9 during the mixing process to obtain a nano-hydrophobic material.

[0119] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0120] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0121] Example 4

[0122] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0123] S1: Clear and compact the surface of the foundation;

[0124] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0125] The area is saline soil, and the hydrophobic gelling material prepared in Example 3 is used;

[0126] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0127] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level.

[0128] S5: compacting the roadbed with hydrophobic cementitious material modified soil according to the construction specifications to form the first layer of hydrophobic improved roadbed, which is mainly used to prevent capillary action at the bottom of the roadbed in high-cold areas;

[0129] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it is laid to the designed height of the roadbed to form a plain soil roadbed 2;

[0130] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5 to form a second layer of hydrophobic improved roadbed;

[0131] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0132] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete drainage roadbed 1 is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0133] In this embodiment, in step S4, the amount of the hydrophobic gelling material is selected to be 2%.

[0134] The laying thickness in step S5 is 20 cm.

[0135] In step S5, after laying the first hydrophobic improved roadbed, step S6 is carried out 1.5 days later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0136] The laying thickness in step S7 is 20 cm.

[0137] In this embodiment, in step S7, hydrophobic improved roadbed material is laid on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After 2.5 days, step S8 is continued.

[0138] Example 5

[0139] A hydrophobic gel material for regulating the humidity of roadbed in high-cold areas and a preparation method thereof, wherein the hydrophobic gelling material is composed of the following raw materials in parts by weight: 0.75 parts of nano hydrophobic material and 95 parts of steel slag-based rock and soil curing agent.

[0140] The nano hydrophobic material is composed of the following raw materials in parts by weight: 8 parts of sodium methyl silicate solution, 5 parts of heptadecafluorodecyltrimethoxysilane, 15 parts of dimethyldichlorosilane, 1 part of ethylene glycol, and 80 parts of nano silica sol;

[0141] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14 parts of steel slag powder, 5 parts of slag, and 7 parts of desulfurized gypsum.

[0142] The preparation method comprises:

[0143] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0144] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a sodium silicate to methanol mass ratio of 1:2, heated to 95° C. for reaction, and after the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0145] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 8:20:20. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0146] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9 during the mixing process to obtain a nano-hydrophobic material.

[0147] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0148] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0149] Example 6

[0150] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0151] S1: Clear and compact the surface of the foundation;

[0152] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0153] The area is loess, and the hydrophobic gelling material prepared in Example 5 is used;

[0154] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0155] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level.

[0156] S5: compacting the roadbed with hydrophobic cementitious material modified soil according to the construction specifications to form the first layer of hydrophobic improved roadbed, which is mainly used to prevent capillary action at the bottom of the roadbed in high-cold areas;

[0157] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it is laid to the designed height of the roadbed to form a plain soil roadbed 2;

[0158] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5 to form a second layer of hydrophobic improved roadbed;

[0159] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0160] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete drainage roadbed 1 is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0161] In this embodiment, the dosage of the hydrophobic gelling material in step S4 is 1.5%.

[0162] The laying thickness in step S5 is 20 cm.

[0163] In step S5, after laying the first hydrophobic improved roadbed, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0164] The laying thickness of step S7 is designed to be 20 cm.

[0165] In step S7, hydrophobic improved roadbed material is laid on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and then proceed to step S8.

[0166] Example 7

[0167] A hydrophobic gel material for regulating the humidity of roadbed in high-cold areas and a preparation method thereof, wherein the hydrophobic gelling material is composed of the following raw materials in parts by weight: 0.5 parts of nano hydrophobic material and 90 parts of steel slag-based rock and soil curing agent.

[0168] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5 parts of sodium methyl silicate solution, 1 part of heptadecafluorodecyltrimethoxysilane, 5 parts of dimethyldichlorosilane, 0.5 parts of ethylene glycol, and 50 parts of nano silica sol;

[0169] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14 parts of steel slag powder, 5 parts of slag, and 7 parts of desulfurized gypsum.

[0170] The preparation method comprises:

[0171] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0172] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a mass ratio of sodium silicate to methanol of 1:4, and heated to 95° C. for reaction. After the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0173] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 5:10:30. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0174] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9.1 during the mixing process to obtain a nano-hydrophobic material.

[0175] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0176] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0177] Example 8

[0178] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0179] S1: Clear and compact the surface of the foundation;

[0180] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0181] The area is common frozen soil, and the hydrophobic gelling material prepared in Example 7 is used;

[0182] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0183] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level. When the groundwater supply is sufficient, the dosage of the nano hydrophobic cementitious material is 3wt%, and in other cases, the dosage can be controlled at 1wt%.

[0184] S5: compact the roadbed with hydrophobic cementitious material modified soil according to the construction specifications. When the groundwater supply is sufficient, the laying thickness is 20 cm, and the laying thickness is 10 cm under other working conditions, forming the first layer of hydrophobic improved roadbed, which mainly prevents capillary action at the bottom of the roadbed in high-cold areas;

[0185] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it is laid to the designed height of the roadbed to form a plain soil roadbed 2;

[0186] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5. When the rainfall in the area is large, the laying thickness is designed to be 20 cm. When the rainfall is small, the laying thickness is 10 cm, forming a second layer of hydrophobic improved roadbed;

[0187] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0188] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete drainage roadbed 1 is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0189] In this embodiment, in step S4, the amount of the hydrophobic gelling material is selected to be 1%.

[0190] In this embodiment, the laying thickness in step S5 is 20 cm.

[0191] In step S5, after laying the first hydrophobic improved roadbed, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0192] In this embodiment, the laying thickness in step S7 is 20 cm.

[0193] In step S7, hydrophobic improved roadbed material is laid on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and then proceed to step S8.

[0194] Example 9

[0195] A hydrophobic gel material for regulating the humidity of roadbed in high-cold areas and a preparation method thereof, wherein the hydrophobic gelling material is composed of the following raw materials in parts by weight: 0.5 parts of nano hydrophobic material and 90 parts of steel slag-based rock and soil curing agent.

[0196] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5 parts of sodium methyl silicate solution, 1 part of heptadecafluorodecyltrimethoxysilane, 5 parts of dimethyldichlorosilane, 0.5 parts of ethylene glycol, and 50 parts of nano silica sol;

[0197] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14 parts of steel slag powder, 5 parts of slag, and 7 parts of desulfurized gypsum.

[0198] The preparation method comprises:

[0199] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0200] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a mass ratio of sodium silicate to methanol of 1:4, and heated to 95° C. for reaction. After the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0201] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 5:10:30. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0202] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 8.9 during the mixing process to obtain a nano-hydrophobic material.

[0203] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0204] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0205] Example 10

[0206] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0207] S1: Clear and compact the surface of the foundation;

[0208] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0209] The area is common frozen soil, and the hydrophobic gelling material prepared in Example 9 is used;

[0210] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0211] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level. When the groundwater supply is sufficient, the dosage of the nano hydrophobic cementitious material is 3wt%, and in other cases, the dosage can be controlled at 1wt%.

[0212] S5: compact the roadbed with hydrophobic cementitious material modified soil according to the construction specifications. When the groundwater supply is sufficient, the laying thickness is 20 cm, and the laying thickness is 10 cm under other working conditions, forming the first layer of hydrophobic improved roadbed, which mainly prevents capillary action at the bottom of the roadbed in high-cold areas;

[0213] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it is laid to the designed height of the roadbed to form a plain soil roadbed 2;

[0214] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5. When the rainfall in the area is large, the laying thickness is designed to be 20 cm. When the rainfall is small, the laying thickness is 10 cm, forming a second layer of hydrophobic improved roadbed;

[0215] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0216] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete drainage roadbed 1 is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0217] In this embodiment, in step S4, the amount of the hydrophobic gelling material is selected to be 2%.

[0218] In this embodiment, the laying thickness in step S5 is 20 cm.

[0219] After the first hydrophobic improved roadbed is laid in step S5, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0220] In this embodiment, the laying thickness in step S7 is 20 cm.

[0221] Step S7 is to lay hydrophobic improved roadbed materials on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and proceed to step S8.

[0222] Embodiment 11

[0223] A hydrophobic gel material for regulating the humidity of roadbed in high-cold areas and a preparation method thereof, wherein the hydrophobic gelling material is composed of the following raw materials in parts by weight: 0.5 parts of nano hydrophobic material and 90 parts of steel slag-based rock and soil curing agent.

[0224] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5 parts of sodium methyl silicate solution, 1 part of heptadecafluorodecyltrimethoxysilane, 5 parts of dimethyldichlorosilane, 0.5 parts of ethylene glycol, and 50 parts of nano silica sol;

[0225] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14 parts of steel slag powder, 5 parts of slag, and 7 parts of desulfurized gypsum.

[0226] The preparation method comprises:

[0227] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0228] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a mass ratio of sodium silicate to methanol of 1:4, and heated to 95° C. for reaction. After the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0229] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 5:10:30. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0230] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9.2 during the mixing process to obtain a nano-hydrophobic material.

[0231] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0232] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0233] Example 12

[0234] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0235] S1: Clear and compact the surface of the foundation;

[0236] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0237] The area is common frozen soil, and the hydrophobic gelling material prepared in Example 11 is used;

[0238] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0239] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level. When the groundwater supply is sufficient, the dosage of the nano hydrophobic cementitious material is 3wt%, and in other cases, the dosage can be controlled at 1wt%.

[0240] S5: compact the roadbed with hydrophobic cementitious material modified soil according to the construction specifications. When the groundwater supply is sufficient, the laying thickness is 20 cm, and the laying thickness is 10 cm under other working conditions, forming the first layer of hydrophobic improved roadbed, which mainly prevents capillary action at the bottom of the roadbed in high-cold areas;

[0241] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it is laid to the designed height of the roadbed to form a plain soil roadbed 2;

[0242] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5. When the rainfall in the area is large, the laying thickness is designed to be 20 cm. When the rainfall is small, the laying thickness is 10 cm, forming a second layer of hydrophobic improved roadbed;

[0243] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0244] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete drainage roadbed 1 is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0245] In this embodiment, in step S4, the amount of the hydrophobic gelling material is selected to be 3%.

[0246] In this embodiment, the laying thickness in step S5 is 10 cm.

[0247] In step S5, after laying the first hydrophobic improved roadbed, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0248] In this embodiment, the laying thickness in step S7 is 10 cm.

[0249] In step S7, hydrophobic improved roadbed material is laid on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and then proceed to step S8.

[0250] Comparative Example 1

[0251] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0252] S1: Clear and compact the surface of the foundation;

[0253] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0254] When the area is ordinary frozen soil, the hydrophobic cementitious material is composed of the following raw materials in parts by weight: 0.5 parts of nano-type hydrophobic material and 90 parts of steel slag-based rock and soil solidifying agent.

[0255] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5 parts of sodium methyl silicate solution, 1 part of heptadecafluorodecyltrimethoxysilane, 5 parts of dimethyldichlorosilane, 0.5 parts of ethylene glycol, and 50 parts of nano silica sol;

[0256] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 5 parts of slag and 7 parts of desulfurized gypsum.

[0257] The preparation method comprises:

[0258] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0259] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a mass ratio of sodium silicate to methanol of 1:4, and heated to 95° C. for reaction. After the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0260] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 5:10:30. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0261] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9 during the mixing process to obtain a nano-hydrophobic material.

[0262] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0263] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0264] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0265] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level. When the groundwater supply is sufficient, the dosage of the nano hydrophobic cementitious material is 3wt%, and in other cases, the dosage can be controlled at 1wt%.

[0266] S5: compact the roadbed with hydrophobic cementitious material modified soil according to the construction specifications. When the groundwater supply is sufficient, the laying thickness is 20 cm, and the laying thickness is 10 cm under other working conditions, forming the first layer of hydrophobic improved roadbed, which mainly prevents capillary action at the bottom of the roadbed in high-cold areas;

[0267] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it reaches the designed height of the roadbed;

[0268] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5. When the rainfall in the area is large, the laying thickness is designed to be 20 cm. When the rainfall is small, the laying thickness is 10 cm, forming a second layer of hydrophobic improved roadbed;

[0269] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0270] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete hydrophobic roadbed structure is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0271] In this embodiment, the dosage of the hydrophobic gelling material in step S4 is 3%.

[0272] In this embodiment, the laying thickness in step S5 is 20 cm.

[0273] In step S5, after laying the first hydrophobic improved roadbed, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0274] In this embodiment, the laying thickness in step S7 is 20 cm.

[0275] In step S7, hydrophobic improved roadbed material is laid on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and then proceed to step S8.

[0276] Comparative Example 2

[0277] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0278] S1: Clear and compact the surface of the foundation;

[0279] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0280] When the area is ordinary frozen soil, the hydrophobic cementitious material is composed of the following raw materials in parts by weight: 0.5 parts of nano-type hydrophobic material and 90 parts of steel slag-based rock and soil solidifying agent.

[0281] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5 parts of sodium methyl silicate solution, 1 part of heptadecafluorodecyltrimethoxysilane, 5 parts of dimethyldichlorosilane, 0.5 parts of ethylene glycol, and 50 parts of nano silica sol;

[0282] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14 parts of steel slag powder and 7 parts of desulfurized gypsum.

[0283] The preparation method comprises:

[0284] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0285] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a mass ratio of sodium silicate to methanol of 1:4, and heated to 95° C. for reaction. After the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0286] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 5:10:30. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0287] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9 during the mixing process to obtain a nano-hydrophobic material.

[0288] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0289] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0290] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0291] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level. When the groundwater supply is sufficient, the dosage of the nano hydrophobic cementitious material is 3wt%, and in other cases, the dosage can be controlled at 1wt%.

[0292] S5: compact the roadbed with hydrophobic cementitious material modified soil according to the construction specifications. When the groundwater supply is sufficient, the laying thickness is 20 cm, and the laying thickness is 10 cm under other working conditions, forming the first layer of hydrophobic improved roadbed, which mainly prevents capillary action at the bottom of the roadbed in high-cold areas;

[0293] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it reaches the designed height of the roadbed;

[0294] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5. When the rainfall in the area is large, the laying thickness is designed to be 20 cm. When the rainfall is small, the laying thickness is 10 cm, forming a second layer of hydrophobic improved roadbed;

[0295] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0296] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete hydrophobic roadbed structure is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0297] In this embodiment, the dosage of the hydrophobic gelling material in step S4 is 3%.

[0298] In this embodiment, the laying thickness in step S5 is 20 cm.

[0299] In step S5, after laying the first hydrophobic improved roadbed, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0300] In this embodiment, the laying thickness in step S7 is 20 cm.

[0301] In step S7, hydrophobic improved roadbed material is laid on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and then proceed to step S8.

[0302] Comparative Example 3

[0303] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0304] S1: Clear and compact the surface of the foundation;

[0305] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0306] When the area is ordinary frozen soil, the hydrophobic cementitious material is composed of the following raw materials in parts by weight: 0.5 parts of nano-type hydrophobic material and 90 parts of steel slag-based rock and soil solidifying agent.

[0307] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5 parts of sodium methyl silicate solution, 1 part of heptadecafluorodecyltrimethoxysilane, 5 parts of dimethyldichlorosilane, 0.5 parts of ethylene glycol, and 50 parts of nano silica sol;

[0308] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14 parts of steel slag powder and 5 parts of slag.

[0309] The preparation method comprises:

[0310] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0311] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a mass ratio of sodium silicate to methanol of 1:4, and heated to 95° C. for reaction. After the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0312] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 5:10:30. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0313] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9 during the mixing process to obtain a nano-hydrophobic material.

[0314] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0315] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0316] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0317] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level. When the groundwater supply is sufficient, the dosage of the nano hydrophobic cementitious material is 3wt%, and in other cases, the dosage can be controlled at 1wt%.

[0318] S5: compact the roadbed with hydrophobic cementitious material modified soil according to the construction specifications. When the groundwater supply is sufficient, the laying thickness is 20 cm, and the laying thickness is 10 cm under other working conditions, forming the first layer of hydrophobic improved roadbed, which mainly prevents capillary action at the bottom of the roadbed in high-cold areas;

[0319] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it reaches the designed height of the roadbed;

[0320] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5. When the rainfall in the area is large, the laying thickness is designed to be 20 cm. When the rainfall is small, the laying thickness is 10 cm, forming a second layer of hydrophobic improved roadbed;

[0321] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0322] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete hydrophobic roadbed structure is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0323] In this embodiment, the dosage of the hydrophobic gelling material in step S4 is 3%.

[0324] In this embodiment, the laying thickness in step S5 is 20 cm.

[0325] In step S5, after laying the first hydrophobic improved roadbed, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0326] In this embodiment, the laying thickness in step S7 is 20 cm.

[0327] In step S7, hydrophobic improved roadbed material is laid on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and then proceed to step S8.

[0328] Comparative Example 4

[0329] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0330] S1: Clear and compact the surface of the foundation;

[0331] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0332] When the area is ordinary frozen soil, the hydrophobic cementitious material is composed of the following raw materials in parts by weight: 0.5 parts of nano-type hydrophobic material and 90 parts of steel slag-based rock and soil solidifying agent.

[0333] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5 parts of sodium methyl silicate solution, 6 parts of heptadecafluorodecyltrimethoxysilane, 0.5 parts of ethylene glycol, and 50 parts of nano silica sol;

[0334] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14 parts of steel slag powder, 5 parts of slag, and 7 parts of desulfurized gypsum.

[0335] The preparation method comprises:

[0336] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0337] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a mass ratio of sodium silicate to methanol of 1:4, and heated to 95° C. for reaction. After the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0338] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 5:10:30. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0339] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9 during the mixing process to obtain a nano-hydrophobic material.

[0340] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0341] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0342] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0343] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level. When the groundwater supply is sufficient, the dosage of the nano hydrophobic cementitious material is 3wt%, and in other cases, the dosage can be controlled at 1wt%.

[0344] S5: compact the roadbed with hydrophobic cementitious material modified soil according to the construction specifications. When the groundwater supply is sufficient, the laying thickness is 20 cm, and the laying thickness is 10 cm under other working conditions, forming the first layer of hydrophobic improved roadbed, which mainly prevents capillary action at the bottom of the roadbed in high-cold areas;

[0345] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it reaches the designed height of the roadbed;

[0346] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5. When the rainfall in the area is large, the laying thickness is designed to be 20 cm. When the rainfall is small, the laying thickness is 10 cm, forming a second layer of hydrophobic improved roadbed;

[0347] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0348] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete hydrophobic roadbed structure is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0349] In this embodiment, the dosage of the hydrophobic gelling material in step S4 is 3%.

[0350] In this embodiment, the laying thickness in step S5 is 20 cm.

[0351] In step S5, after laying the first hydrophobic improved roadbed, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0352] In this embodiment, the laying thickness in step S7 is 20 cm.

[0353] In step S7, hydrophobic improved roadbed material is laid on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and then proceed to step S8.

[0354] Comparative Example 5

[0355] A construction method of a hydrophobic gel material for controlling roadbed humidity in high-cold areas comprises the following steps:

[0356] S1: Clear and compact the surface of the foundation;

[0357] S2: Prepare hydrophobic materials with different raw material ratios for different soils to improve the applicability of the materials;

[0358] When the area is ordinary frozen soil, the hydrophobic cementitious material is composed of the following raw materials in parts by weight: 0.5 parts of nano-type hydrophobic material and 90 parts of steel slag-based rock and soil solidifying agent.

[0359] The nano hydrophobic material is composed of the following raw materials in parts by weight: 5 parts of sodium methyl silicate solution, 6 parts of dimethyldichlorosilane, 0.5 parts of ethylene glycol, and 50 parts of nano silica sol;

[0360] The steel slag-based rock soil solidifying agent is composed of the following raw materials in parts by weight: 14 parts of steel slag powder, 5 parts of slag, and 7 parts of desulfurized gypsum.

[0361] The preparation method comprises:

[0362] (1) Add sodium silicate into deionized water and stir it to fully dissolve;

[0363] (2) The sodium silicate solution prepared in step (1) and methanol are mixed in a mass ratio of sodium silicate to methanol of 1:4, and heated to 95° C. for reaction. After the reaction is completed, deionized water is added and filtered to obtain a sodium methyl silicate solution.

[0364] (3) Hydration reaction of elemental silicon with pure water under the catalysis of sodium hydroxide, wherein the mass ratio of elemental silicon, sodium hydroxide and water is 5:10:30. After the reaction is completed, the reaction is allowed to stand and filtered to obtain nano-silica sol.

[0365] (4) Mix sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol, and stir the mixed solution at high speed at room temperature at a stirring speed of 100 r / min for 15 minutes. At the same time, the pH value needs to be controlled at 9 during the mixing process to obtain a nano-hydrophobic material.

[0366] (5) taking steel slag powder with a particle size range of 1 μm-100 μm, slag with a particle size range of 1 μm-100 μm, and desulfurized gypsum with a particle size range of 1 μm-100 μm, and mixing them evenly to obtain a steel slag-based rock and soil solidifying agent;

[0367] (6) The nanometer hydrophobic material prepared in step (4) is mixed with the steel slag-based rock soil solidifying agent prepared in step (5) to obtain a hydrophobic cementitious material.

[0368] S3: The roadbed is laid in layers according to the construction standard specification "Technical Analysis of Roadbed Construction and Special Roadbed Treatment";

[0369] S4: When the first layer of roadbed soil is filled, the hydrophobic cementitious material is mixed with the soil material to obtain the hydrophobic cementitious material modified soil material, and the soil material is paved. The paving quality is adjusted according to the local groundwater level. When the groundwater supply is sufficient, the dosage of the nano hydrophobic cementitious material is 3wt%, and in other cases, the dosage can be controlled at 1wt%.

[0370] S5: compact the roadbed with hydrophobic cementitious material modified soil according to the construction specifications. When the groundwater supply is sufficient, the laying thickness is 20 cm, and the laying thickness is 10 cm under other working conditions, forming the first layer of hydrophobic improved roadbed, which mainly prevents capillary action at the bottom of the roadbed in high-cold areas;

[0371] S6: Continue to lay plain soil on the upper part of the drainage improved roadbed and compact it until it reaches the designed height of the roadbed;

[0372] S7: Continue to lay a second layer of waterproof layer on the top surface of the plain soil roadbed. The waterproof layer is mainly used to prevent rainfall from infiltrating the top of the roadbed. The laying method is the same as step S5. When the rainfall in the area is large, the laying thickness is designed to be 20 cm. When the rainfall is small, the laying thickness is 10 cm, forming a second layer of hydrophobic improved roadbed;

[0373] S8: Continue construction on top of the second layer of drainage-improved roadbed according to the construction specifications;

[0374] S9: After the highway slope is brushed, the slope is treated for drainage. The treatment method is still paving. The paving method and thickness are the same as step S5, and finally a complete hydrophobic roadbed structure is formed to achieve active control of the balanced humidity of the roadbed in high-altitude and cold areas, and ensure the long-term service performance of the highway roadbed.

[0375] In this embodiment, the dosage of the hydrophobic gelling material in step S4 is 3%.

[0376] In this embodiment, the laying thickness in step S5 is 20 cm.

[0377] After the first hydrophobic improved roadbed is laid in step S5, step S6 is carried out one day later to ensure that the hydrophobic improved roadbed material fully reacts with the roadbed soil.

[0378] In this embodiment, the laying thickness in step S7 is 20 cm.

[0379] Step S7 is to lay hydrophobic improved roadbed materials on the top of the plain soil roadbed to form a second layer of hydrophobic improved roadbed. After paving, wait for 2 days and proceed to step S8.

[0380] The hydrophobic cementitious material modified soil prepared in step S4 of each embodiment 2, 4, 6, 8, 10, 12 and comparative examples 1-5 was taken as a sample, and its contact angle was tested, and the mixed material was subjected to sample pressing according to the on-site compaction degree. The contact angle is the contact angle between the soil and water after flattening. Based on the measurement of the contact angle, the waterproof function of the roadbed can be evaluated, and then whether the roadbed has the ability of "actively regulating the balanced humidity".

[0381] The relevant test results are shown in Table 1.

[0382] Table 1 Contact angle measurement results of examples and comparative examples

[0383]

[0384] Figure 3 is the soil surface contact angle after the hydrophobic gel material is added in Example 2. From the comparison of Examples 2, 4, and 6, it can be seen that for different soil materials, the hydrophobic gelling material of the present invention can achieve a better hydrophobic effect, thereby realizing active regulation of the balanced humidity of the regional roadbed.

[0385] From the comparison of Examples 2, 8 and 10, it can be seen that as the amount of the hydrophobic cementitious material decreases, the hydrophobic effect decreases, but the hydrophobicity is still relatively good.

[0386] From the comparison between Examples 2 and 12, it can be seen that the paving thickness is selected according to whether the groundwater recharge is sufficient, so as to ensure that the roadbed has better hydrophobicity under various working conditions.

[0387] From the comparison between Example 2 and Comparative Examples 1-3, it can be seen that the steel slag-based rock soil curing agent composed of steel slag powder, slag, and desulfurized gypsum is compounded with nano-type hydrophobic materials to obtain a better hydrophobic effect.

[0388] From the comparison between Example 2 and Comparative Examples 4 and 5, it can be seen that, compared with single organosilicon, a better hydrophobic effect can be obtained by compounding dimethyldichlorosilane and heptadecafluorodecyltrimethoxysilane.

[0389] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydrophobic gel material for regulating roadbed humidity in high-cold areas, characterized in that: The method is composed of the following raw materials in parts by weight: 0.5-1 part of nano hydrophobic material and 90-95 parts of steel slag-based rock and soil curing agent; The nano hydrophobic material is composed of the following raw materials in parts by weight: 5-8 parts of sodium methyl silicate solution, 6-20 parts of silane modifier, 0.5-1 part of ethylene glycol, and 50-100 parts of nano silica sol; The steel slag-based rock soil curing agent is composed of the following raw materials in parts by weight: 14-16 parts of steel slag powder, 5-7 parts of slag, and 7-9 parts of desulfurized gypsum; The silane modifier is a mixture of heptadecafluorodecyltrimethoxysilane and dimethyldichlorosilane, and the mass ratio of the two is 1-5:5-15.

2. The hydrophobic gel material for regulating roadbed humidity in high-cold areas according to claim 1, characterized in that: The preparation method of the sodium methyl silicate solution comprises: Dissolving sodium silicate in water to hydrolyze it to obtain a sodium silicate solution; The sodium silicate solution is mixed with methanol, and heated to 90° C.-95° C. for reaction. After the reaction is completed, water is added, and the mixture is filtered to obtain the product.

3. The hydrophobic gel material for regulating roadbed humidity in high-cold areas as claimed in claim 2, characterized in that: The mass ratio of the sodium silicate to methanol is 1-2:

4.

4. The hydrophobic gel material for regulating roadbed humidity in high-cold areas as claimed in claim 1, characterized in that: The preparation method of the nano silica sol comprises: The elemental silicon is subjected to a hydration reaction with water in the presence of sodium hydroxide, and after the reaction is completed, the silicon is allowed to stand for a treatment and filtered to obtain the silicon.

5. The hydrophobic gel material for regulating roadbed humidity in high-cold areas as claimed in claim 4, characterized in that: The mass ratio of the elemental silicon, sodium hydroxide and water is 5-10:10-20:20-30.

6. A method for preparing a hydrophobic gel material for regulating roadbed humidity in high-cold areas according to any one of claims 1 to 5, characterized in that: include: The sodium methyl silicate solution, the silane modifier, ethylene glycol and the nano-silica sol are mixed evenly to obtain a nano-type hydrophobic material; The steel slag powder, slag and desulfurized gypsum are mixed evenly to obtain a steel slag-based rock and soil solidifying agent; The nanometer hydrophobic material is mixed evenly with the steel slag-based rock soil solidifying agent to obtain the solidified material.

7. The method for preparing a hydrophobic gel material for controlling roadbed humidity in high-cold areas as claimed in claim 6, characterized in that: The sodium methyl silicate solution, silane modifier, ethylene glycol and nano silica sol are mixed under stirring.

8. The method for preparing a hydrophobic gel material for regulating roadbed humidity in high-cold areas as claimed in claim 7, characterized in that: The stirring speed is 100r / min-200r / min.

9. The method for preparing a hydrophobic gel material for regulating roadbed humidity in high-cold areas as claimed in claim 7, characterized in that: The stirring time is 10 min-15 min.

10. The method for preparing a hydrophobic gel material for controlling roadbed humidity in high-cold areas as claimed in claim 6, characterized in that: The particle size of the steel slag powder is in the range of 1 μm to 100 μm.

11. The method for preparing a hydrophobic gel material for controlling roadbed humidity in high-cold areas according to claim 6, characterized in that: The particle size of the slag is in the range of 1 μm to 100 μm.

12. The method for preparing a hydrophobic gel material for controlling roadbed humidity in high-cold areas according to claim 6, characterized in that: The particle size of the desulfurized gypsum ranges from 1 μm to 100 μm.

13. The method for preparing a hydrophobic gel material for controlling roadbed humidity in high-cold areas as claimed in claim 6, characterized in that: The preparation method of the silane modifier comprises: uniformly mixing heptadecafluorodecyltrimethoxysilane and dimethyldichlorosilane to obtain the silane modifier.

14. An application of the hydrophobic gel material for controlling roadbed humidity in high-cold areas according to any one of claims 1 to 5 in roadbed construction, characterized in that: include: Clear and compact the surface of the foundation; The hydrophobic gel material for controlling the humidity of the roadbed in high-cold areas according to any one of claims 1 to 5 is mixed with soil to form a hydrophobic gelling material modified soil; The roadbed is laid in layers, and when the first layer of roadbed soil is filled, the hydrophobic cementitious material modified soil material is used for laying, and after the laying is completed, the soil material is compacted to obtain the first layer of hydrophobic improved roadbed; Continue to lay soil material on the upper part of the first layer of hydrophobic improved roadbed, and compact it until it is laid to the designed roadbed height to obtain the soil material roadbed; Laying the hydrophobic cementitious material modified soil material on the top surface of the soil roadbed and compacting it to form a second layer of hydrophobic improved roadbed; After the highway slope is brushed, the hydrophobic cementitious material modified soil is laid and compacted to obtain a complete hydrophobic roadbed structure.

15. The use of the hydrophobic gel material for regulating roadbed humidity in high-cold areas in roadbed construction as claimed in claim 14, characterized in that: The dosage of the hydrophobic gel material for controlling the humidity of the roadbed in the high-cold area is 1%-3% of the mass of the soil material.

16. The use of the hydrophobic gel material for regulating roadbed humidity in high-cold areas as claimed in claim 14 in roadbed construction, characterized in that: The laying thickness of the first layer of hydrophobic improved roadbed is 10cm-20cm.

17. The use of the hydrophobic gel material for regulating roadbed humidity in high-cold areas in roadbed construction as claimed in claim 14, characterized in that: During the laying process of the first layer of hydrophobic improved roadbed, compaction is carried out after an interval of 1-1.5 days.

18. The use of the hydrophobic gel material for regulating roadbed humidity in high-cold areas in roadbed construction as claimed in claim 14, characterized in that: The laying thickness of the second layer of hydrophobic improved roadbed is 10cm-20cm.

19. The use of the hydrophobic gel material for regulating roadbed humidity in high-cold areas in roadbed construction as claimed in claim 14, characterized in that: During the laying process of the second layer of hydrophobic improved roadbed, compaction is carried out after an interval of 2-2.5 days after the laying is completed.

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