High durability highway subgrade repairing composite grouting material and preparation method thereof

Abstract

The application relates to the field of concrete, in particular to a high-durability composite grouting material for repairing highway subgrades and a preparation method thereof. The material is prepared from the following raw materials in parts by weight: silica fume 30-40 parts; aluminum sulfate cement 150-250 parts; Portland cement 50-100 parts; redispersible latex powder 13-18 parts; quartz sand 100-200 parts; modified material 10-28 parts; processing aid 10-30 parts; and water 40-60 parts. The modified material is composed of silica aerogel particles, pre-dispersed aramid short fiber pulp and activated rheological aid. The material prepared by the above scheme has better construction fluidity, is convenient for filling gaps and cavities, has high bearing capacity, meets the requirement of rapid traffic, has excellent anti-freezing and salt corrosion resistance, and has a freezing loss rate and a salt corrosion resistance rate both lower than 10%, can maintain good performance in multiple harsh environments, and the silica aerogel particles and the pre-dispersed aramid short fiber pulp construct a stable structure system, and cooperate with other raw materials to improve the comprehensive performance and service life of the material.

Description

Technical Field

[0001] This application relates to the field of concrete, and more specifically, to a high-durability composite grouting material for highway subgrade repair and its preparation method. Background Technology

[0002] In the field of transportation infrastructure construction and maintenance, grouting materials play an irreplaceable role as a key engineering material. With the booming development of the transportation industry, the demand for highway construction and maintenance is increasing daily. Highways bear enormous traffic volumes and heavy-load transportation tasks, and the stability and durability of their roadbeds directly affect road safety and smooth traffic flow. Grouting materials, through pressure injection, can fill structural cracks, pores, and other defects, not only restoring structural integrity but also enhancing structural strength and stability.

[0003] In highway construction, it helps improve the quality of the roadbed and ensures the initial construction quality of the road; during maintenance, it can promptly repair roadbed damage and extend the service life of the road. Compared with other ordinary building repair materials, grouting materials used for highway roadbed repair need to have superior performance to meet the requirements of high-load, high-frequency traffic flow on highways, such as good fluidity, excellent wear resistance, and outstanding durability. These properties are crucial for ensuring the safe and stable operation of highways.

[0004] Currently, various types of grouting materials are available on the market, including common types such as cement-based grouting materials, polymer grouting materials, and chemical grouting materials. Cement-based grouting materials are widely used in some conventional engineering fields due to their advantages such as wide availability of raw materials and low cost. They are typically composed of cement, aggregates, and additives, and hardening and strength gain are achieved through the hydration reaction of cement. Polymer grouting materials, with their good bonding properties and certain flexibility, are also used in some projects. They are mainly composed of polymers and can adapt to structural deformation to a certain extent. Chemical grouting materials, with their excellent permeability and filling properties, are used in specific engineering scenarios. They are generally composed of chemical agents and can penetrate deep into tiny pores. However, these existing grouting materials have gradually revealed many shortcomings in practical applications.

[0005] In terms of fluidity, some grouting materials are difficult to fill evenly into the fine cracks and complex pores of the roadbed during construction, resulting in incomplete filling and ineffective reinforcement. For example, some cement-based grouting materials are too viscous and have poor fluidity at low water-cement ratios, making it difficult to penetrate into the small defects inside the roadbed; while at high water-cement ratios, they are prone to bleeding and segregation, affecting the grouting quality. Abrasion resistance is also a major shortcoming of existing grouting materials. Frequent vehicle traffic on highways and constant friction between tires and the roadbed surface require grouting materials with good abrasion resistance to withstand long-term wear.

[0006] However, many traditional grouting materials are prone to surface wear and peeling after long-term use, leading to a decrease in the smoothness of the roadbed surface. This not only affects driving comfort but also accelerates roadbed damage. Durability is also a prominent issue for existing materials. In high-altitude and cold regions, drastic temperature changes can cause freeze-thaw cycles in grouting materials, gradually loosening their internal structure and reducing their strength. In saline soil areas and coastal regions, the soil and air contain large amounts of corrosive media such as chloride ions and sulfates. These media can erode the cement hydration products in the grouting materials, causing them to expand and crack, thus losing their original performance. In areas where de-icing salt is used, the chemical components in the de-icing salt can also corrode the grouting materials, further shortening their service life. Overall, existing grouting materials are insufficient in terms of fluidity, wear resistance, and durability to meet the requirements for highway roadbed repair in diverse and harsh environments. Summary of the Invention

[0007] To address the shortcomings of existing grouting materials in terms of fluidity, abrasion resistance, and durability in meeting the requirements for highway subgrade repair under diverse and harsh environments, this application provides a high-durability composite grouting material for highway subgrade repair and its preparation method.

[0008] In a first aspect, a high-durability composite grouting material for highway subgrade repair is composed of the following raw materials in parts by weight: 30-40 parts silica fume; 150-250 parts aluminum sulfate cement; 50-100 parts silicate cement; 13-18 parts redispersible latex powder; 100-200 parts quartz sand; 10-28 parts modifier; 10-30 parts processing aid; and 40-60 parts water; wherein the modifier is composed of silica aerogel particles, predispersed aramid short fiber pulp, and activated rheology modifier.

[0009] By adopting the above technical solutions, the material flowability during construction is stabilized at over 300mm, facilitating the filling of gaps and voids and improving construction efficiency and quality; the 1-day compressive strength can reach over 30MPa, providing high load-bearing capacity in a short time after repair, meeting the requirements for rapid traffic opening; it exhibits outstanding wear resistance, resisting wear caused by long-term vehicle operation and reducing long-term wear and tear; it demonstrates excellent freeze-thaw resistance and salt corrosion resistance, with both freeze-thaw loss rate and salt corrosion resistance rate below 10%, maintaining good performance even in diverse and harsh environments; the silica aerogel particles and pre-dispersed aramid short fiber pulp construct a stable structural system, which, in combination with other raw materials, enhances the overall performance and service life of the material.

[0010] Preferably, the activating dispersant is one or more of the following: polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxy-terminated, 3-(tris(hydroxymethyl)methyl)amino-1-propanesulfonic acid, and rosin-modified marinic acid resin dispersion.

[0011] By adopting the above technical solutions, α-methoxy end-capping of polyethylene oxide-polypropylene oxide-polyethylene oxide can reduce the interfacial tension between materials, promote the dispersion of raw material particles, and prevent agglomeration; 3-(tris(hydroxymethyl)methyl)amino-1-propanesulfonic acid can stabilize the pH value of the system, providing a suitable chemical environment for the reaction and dispersion of raw materials; rosin-modified marinic acid resin dispersion can enhance the coating and dispersion effect on solid particles. These activating dispersants can promote the uniform dispersion of silica aerogel particles and pre-dispersed aramid short fiber pulp in the system, ensuring that the stable structural system constructed by the two can be uniformly distributed throughout the material. At the same time, they enhance the compatibility and bonding force between the modified material and other raw materials such as silica fume, aluminum sulfate cement, silicate cement, redispersible latex powder, and quartz sand, synergistically improving the comprehensive performance of composite grouting materials, such as fluidity, compressive strength, wear resistance, and salt corrosion resistance, ensuring the durability of the material in various harsh environments. Furthermore, the combination of silica fume, aluminum sulfate cement, silicate cement, redispersible latex powder, quartz sand, modifiers, processing aids, and water ensures stable material flowability, excellent early strength, outstanding wear resistance, and superior resistance to freezing and salt corrosion, meeting the needs of highway subgrade repair.

[0012] Preferably, the activating dispersant is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxy-terminated, 3-(tris(hydroxymethyl)methyl)amino-1-propanesulfonic acid, and rosin-modified marinic acid resin dispersion in a weight ratio of 1:(0.5-1):(0.5-2).

[0013] By adopting the above technical solution, the α-methoxy-terminated polyoxyethylene-polyoxypropylene-polyoxyethylene, 3-(tris(hydroxymethyl)methyl)amino-1-propanesulfonic acid, and rosin-modified marinic acid resin dispersion, compounded at a weight ratio of 1:(0.5-1):(0.5-2), produces a significant synergistic effect, which can promote material dispersion more efficiently and stably for a longer period of time. The modified material formed by this compounded activating dispersant and silica aerogel particles and pre-dispersed aramid short fiber pulp can more thoroughly promote the uniform dispersion of silica aerogel particles and pre-dispersed aramid short fiber pulp in the system, ensuring the uniform distribution of the stable structural system constructed by the two, greatly enhancing the compatibility and bonding force of the modified material with other raw materials such as silica fume, aluminum sulfate cement, silicate cement, redispersible latex powder, and quartz sand, and further synergistically improving the comprehensive performance of composite grouting materials such as fluidity, compressive strength, wear resistance, and salt corrosion resistance, and more reliably ensuring the durability of materials in various harsh environments. In addition, the synergistic effect of silica fume, aluminum sulfate cement, and silicate cement gives the material excellent early strength, meeting the requirements for rapid traffic opening; the activation rheology aids in redispersible latex powder and modified materials stabilize the material's flowability, improving construction efficiency and quality; the combination of quartz sand and predispersed aramid short fiber pulp gives the material outstanding wear resistance; and the synergistic effect of silica aerogel particles, predispersed aramid short fiber pulp, and silica fume gives the material excellent freeze-thaw resistance and salt corrosion resistance.

[0014] Preferably, the modified material is composed of silica aerogel particles, pre-dispersed aramid short fiber pulp and activating agent in a weight ratio of (2-5):(1-3):1.

[0015] By adopting the above technical solution, the modified material is composed of silica aerogel particles, pre-dispersed aramid short fiber pulp, and activating agents in a specific weight ratio. This is combined with silica fume, aluminum sulfate cement, silicate cement, redispersible latex powder, quartz sand, processing aids, and water to ensure the composite grouting material has a stable flowability of over 300mm, easily filling gaps and voids, improving construction efficiency and quality. Its 1-day compressive strength can reach over 30MPa, providing high load-bearing capacity in a short time. It exhibits outstanding wear resistance, reducing long-term wear and tear. Furthermore, it demonstrates excellent freeze-thaw resistance and salt corrosion resistance, with both freeze-thaw loss and salt corrosion rates below 10%, ensuring the material's durability in diverse and harsh environments. This specific ratio also makes the stable structural system constructed from silica aerogel particles and pre-dispersed aramid short fiber pulp more rational, further enhancing the material's overall performance and service life.

[0016] Preferably, the processing aid is a combination of one or more of the following: an expanding agent, a water-reducing agent, an early-strength agent, a retarder, and an antifreeze agent.

[0017] By adopting the above technical solution, the composite grouting material, whose processing aids consist of one or more of the following: expanding agent, water-reducing agent, early strength agent, retarder, and antifreeze agent, can be combined with silica fume, aluminum sulfate cement, silicate cement, redispersible latex powder, quartz sand, modifier, and water to adjust the material's expansion performance, fluidity, early strength development rate, setting time, and antifreeze performance. This meets the usage requirements under different construction environments and conditions, further improving the material's applicability and comprehensive performance in highway subgrade repair.

[0018] Preferably, the expanding agent is one or a combination of multiple of the following: calcium sulfoaluminate expanding agents, calcium aluminate expanding agents, calcium oxide expanding agents, and magnesium oxide expanding agents.

[0019] By adopting the above technical solution, using one or more of the following as expansion agents—calcium sulfoaluminate, calcium aluminate, calcium oxide, and magnesium oxide—and combining them with silica fume, aluminum sulfate cement, silicate cement, redispersible latex powder, quartz sand, modifiers, other processing aids, and water, the high-durability composite grouting material for highway subgrade repair can better exert its expansion effect. This helps compensate for the shrinkage of the material during the hardening process, improves the density and integrity of the material, further enhances its freeze-thaw resistance and salt corrosion resistance, and ensures the durability of the material in diverse and harsh environments.

[0020] Preferably, the water-reducing agent is a lignin sulfonate and / or naphthalene sulfonate formaldehyde polymer.

[0021] By adopting the above technical solution, the composite grouting material is composed of silica fume, aluminum sulfate cement, silicate cement, redispersible latex powder, quartz sand, modifier, processing aid, and water in specific weight parts. The modifier is composed of silica aerogel particles, predispersed aramid short fiber pulp, and activated rheology modifier, which makes the material have stable fluidity, excellent early strength, outstanding wear resistance, and excellent antifreeze and salt corrosion resistance. The water-reducing agent is made of lignin sulfonate and / or naphthalene sulfonate formaldehyde polymer, which can reduce the water consumption of the material, improve the fluidity of the grout and the convenience of construction, and at the same time help to improve the strength and durability of the material.

[0022] Preferably, the early strength agent is one or more of calcium chloride, sodium sulfate, nitrate, and triethanolamine.

[0023] By adopting the above technical solution, one or more of calcium chloride, sodium sulfate, nitrate, and triethanolamine are used as early-strength agents. These agents work together with silica fume, aluminum sulfate cement, silicate cement, redispersible latex powder, quartz sand, a modifier composed of silica aerogel particles, pre-dispersed aramid short fiber pulp, and activated rheology modifiers, a processing aid composed of one or more of expansive agents, water-reducing agents, early-strength agents, retarders, and antifreeze agents, and water. This results in a high-durability composite grouting material for highway subgrade repair exhibiting excellent early strength, with a 1-day compressive strength exceeding 30 MPa. This meets the requirements for rapid traffic opening and reduces the impact of road maintenance on traffic.

[0024] Preferably, the sustained-release agent is one or a combination of tartaric acid, citric acid and its salts, and sodium gluconate.

[0025] By adopting the above technical solution, one or more of tartaric acid, citric acid and its salts, and sodium gluconate are used as a slow-release agent. These are combined with silica fume, aluminum sulfate cement, silicate cement, redispersible latex powder, quartz sand, modifiers, processing aids composed of one or more of expansion agents, water-reducing agents, early-strength agents, retarders, and antifreeze agents, and water, in a composite grouting material composed of specific weight parts. This slow-release effect, combined with the precise proportioning and synergistic effect of other raw materials, results in stable material flowability, excellent early strength, outstanding wear resistance, and superior antifreeze and salt corrosion resistance. Overall, this improves the material's comprehensive performance and service life in the complex and ever-changing highway subgrade environment.

[0026] Secondly, a grouting material for highway subgrade repair is prepared by the following method: 15-25 parts by weight of aluminum sulfate cement, 5-10 parts by weight of silicate cement, 1-3 parts by weight of expansion agent, 0.5-1.5 parts by weight of water-reducing agent, 0.5-2 parts by weight of early-strength agent, 0.1-0.5 parts by weight of retarder, 1-8 parts by weight of modifier, and 1-3 parts by weight of processing aid are weighed and mixed evenly to obtain the grouting material.

[0027] By adopting the above-mentioned technical solution and utilizing the raw material formula of this application, combined with a preparation method that weighs aluminum sulfate cement, silicate cement, expanding agent, water-reducing agent, early-strength agent, retarder, modifier, and processing aid in specific weight parts and mixes them evenly, a highly durable composite grouting material for highway subgrade repair can be prepared. This material possesses stable fluidity, excellent early strength, outstanding wear resistance, and superior frost resistance and salt corrosion resistance. This preparation method is simple to operate, ensures uniform mixing of all raw materials, allows the material to leverage the advantages of precise proportions and synergistic effects of each raw material, improves construction efficiency and quality, meets the needs of rapid traffic opening, reduces the impact of road maintenance on traffic, reduces material wear during long-term use, and ensures the durability of the material in diverse and harsh environments.

[0028] In summary, this application includes at least one of the following beneficial technical effects: 1. It has good construction convenience and the fluidity is stable at over 300mm. The lubricating and dispersing effect of redispersible latex powder, combined with water and other powder raw materials, and the activating rheology aid in the modified material promotes uniform mixing of materials. It can easily fill gaps and voids, and improve construction efficiency and quality. 2. Excellent early strength, with a 1-day compressive strength of over 30 MPa. The synergistic effect of aluminum sulfate cement and silicate cement enables the material to have a high load-bearing capacity in a short time, meeting the requirements for rapid traffic opening and reducing the impact on traffic. 3. Excellent wear resistance: Quartz sand, as a hard aggregate, improves hardness and wear resistance, while pre-dispersed aramid short fiber pulp forms a network structure to enhance wear resistance and reduce long-term wear. 4. Excellent antifreeze and salt corrosion resistance, with both the antifreeze loss rate and salt corrosion resistance rate being less than 10%. The synergistic effect of silica aerogel particles, pre-dispersed aramid short fiber pulp and silica fume maintains good performance and improves durability in various harsh environments. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the embodiments.

[0030] Redispersible latex powder, Yushan Zehe New Material Technology Co., Ltd., model 8029; Silica aerogel particles, AP series aerogel powder AP-15 from Suzhou Zhuona Nanotechnology Co., Ltd.; Rhenogran P91-40 / NBR is a predispersed aramid short fiber pulp (model: Twaron®) based on nitrile rubber. Polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxyl-terminated, molecular formula: CH3O[C2H4O n [C3H6O] m [C2H4O] n Where n is 10-30 and m is 20-30; Rosin-modified marinic acid resin dispersion is obtained by dissolving 1 part by weight of rosin-modified marinic acid resin in 1 part by weight of anhydrous ethanol. The manufacturer and model of the rosin-modified marinic acid resin is Xiamen Weier Chemical Co., Ltd. WMS-2175, and the acid value is 160-175 mgKOH / g. Example

[0031] Example 1 A high-durability composite grouting material for highway subgrade repair is prepared by the following method: Weigh out 35 parts silica fume, 200 parts aluminum sulfate cement, 73 parts silicate cement, 15 parts redispersible latex powder, 155 parts quartz sand, 20 parts processing aids, and 22 parts modifiers by weight, mix them evenly, then add 50 parts water and mix evenly to obtain the grouting material.

[0032] The modified material consists of silica aerogel particles, pre-dispersed aramid short fiber pulp, and activating agents in a weight ratio of 2:1:1. The activating dispersant consists of polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxy-terminated and 3-(tris(hydroxymethyl)methyl)amino-1-propanesulfonic acid in a weight ratio of 1:1. The processing aids consist of an expanding agent, a water-reducing agent, an early-strength agent, a retarder, and an antifreeze agent in a weight ratio of 1:0.2:0.1:1.7:1. The expanding agent is a calcium sulfoaluminate-based expanding agent. The water-reducing agent is sodium lignosulfonate. The early-strength agent is calcium chloride. The slow-release agent is sodium gluconate.

[0033] Example 2-3 The difference between Examples 2-3 and Example 1 lies in the amount of raw materials used, as detailed below: Table 1. Raw material usage (parts by weight) for Examples 1-3

[0034] Example 4

[0035] The difference between Example 4 and Example 1 is that the activating dispersant is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxy-terminated and rosin-modified marinic acid resin dispersion in a weight ratio of 1:1.

[0036] Example 5 The difference between Example 5 and Example 1 is that the activating dispersant is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxy-terminated, 3-(tris(hydroxymethyl)methyl)amino-1-propanesulfonic acid, and rosin-modified marinic acid resin dispersion in a weight ratio of 1:1:1.

[0037] Example 6 The difference between Example 6 and Example 1 is that the activating dispersant is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxy-terminated, 3-(tris(hydroxymethyl)methyl)amino-1-propanesulfonic acid, and rosin-modified marinic acid resin dispersion in a weight ratio of 1:1:2.

[0038] Example 7 The difference between Example 7 and Example 1 is that the activating dispersant is polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxy end-capped.

[0039] Example 8 The difference between Example 8 and Example 1 is that the activating dispersant is a rosin-modified marinic acid resin dispersion.

[0040] Comparative Example

[0041] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the pre-dispersed aramid short fiber pulp was replaced with an equal amount of silica aerogel particles.

[0042] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that silica aerogel particles are replaced in equal amounts with pre-dispersed aramid short fiber pulp.

[0043] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the activating rheology modifier is silica aerogel particles.

[0044] Performance testing Experimental sample preparation: Molding mold: Pour the mixed grouting material obtained in Examples 1-8 and Comparative Examples 1-3 into a standard-sized mold, usually a 40mm×40mm×160mm mold. During the pouring process, care should be taken to avoid generating air bubbles. The surface can be smoothed with a scraper.

[0045] Vibration compaction: Slightly vibrate the mold to remove air bubbles in the mixture and ensure the compactness of the test block. The vibration time should not be too long to avoid material delamination.

[0046] Curing process: Place the mold in an environment with a temperature of 25℃ and a relative humidity of 50% for 24 hours to cure and shape; Curing treatment: The cured mold is placed in a curing chamber for curing treatment, and then demolded to obtain test samples for the following experiments; the specific curing conditions are as follows: Sample 1: Cured for 1 day at a relative humidity of 85%; Sample 2: Cured for 7 days at a relative humidity of 85%; Sample 3: Cured for 28 days at a relative humidity of 85%.

[0047] 1) Flowability The grouting materials obtained in Examples 1-8 and Comparative Examples 1-3 were tested for fluidity according to GB / T 50448-2015. A fluidity ≥300mm was considered qualified, otherwise it was unqualified. 2) Compressive strength The compressive strength of samples 1-3 was tested according to GB / T 17671-2021.

[0048] Strength grade: Grade A > 70 MPa; 60 MPa < Grade B ≤ 70 MPa; 50 MPa < Grade C ≤ 60 MPa; 40 MPa < Grade D ≤ 50 MPa; 30 MPa < Grade E ≤ 40 MPa; Grade F ≤ 30 MPa; 3) Wear resistance Test according to JC / T 421-2004. Wear resistance ≤ 2.0 kg / m 2 If so, it is recorded as qualified; otherwise, it is unqualified.

[0049] 4) Durability performance: Salt resistance test: Conduct accelerated corrosion test in a standard salt spray chamber using salt spray corrosion test. Put sample 3 into the salt spray chamber, use 10% sodium chloride solution, control the temperature at 37 °C, the test time is 10 days. After taking it out, place it in an environment with a temperature of 25 °C and a relative humidity of 50% for 24 h, and then test the compressive strength (sample 3) and wear resistance according to the test standards in 2)-3), and calculate the loss rate after corrosion resistance test (1 - the value after test divided by the value after test and then multiplied by 100%).

[0050] Cold and corrosion resistance: Refer to the relevant test requirements for low-temperature environment in "Technical Specification for Application of Cementitious Grouting Materials" (GB / T 50448-2015) for sample 3 to conduct cold and heat cycling. The cycling temperature is from -20 °C to 20 °C, and 8 h is a cycle period. Cycle 100 times. After taking it out, place it in an environment with a temperature of 25 °C and a relative humidity of 50% for 24 h, and then test the compressive strength (sample 3) and wear resistance according to the test standards in 2)-3), and calculate the loss rate after cold resistance test (1 - the value after test divided by the value after test and then multiplied by 100%).

[0051] Loss rate grade: Grade I ≤ 10%; 10% < Grade II ≤ 20%; Grade III ≤ 20%.

[0052] The above data are specifically shown in Table 2; Table 2 Experimental data of Examples 1-8 and Comparative Examples 1-3

[0053] Combined with Example 1 and Comparative Examples 1-3 and Table 2, it can be seen that the fluidity of Example 1 is qualified (above 300 mm), the compressive strength grade is higher than that of Comparative Examples 1-3, and the wear resistance is ≤ 2.0 kg / m 2The following components are used for a durability grade of 10% < Grade II ≤ 20%; Specific components include: 30-40 parts silica fume; 150-250 parts aluminum sulfate cement; 50-100 parts silicate cement; 13-18 parts redispersible latex powder; 100-200 parts quartz sand; 10-28 parts modifier; 10-30 parts processing aid; and 40-60 parts water. The modifier is composed of silica aerogel particles, pre-dispersed aramid short fiber pulp, and activated rheology modifier. The resulting grouting material exhibits superior performance for highway subgrade repair, providing excellent flowability, mechanical properties, and durability.

[0054] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-durability composite grouting material for highway subgrade repair, characterized in that, It consists of the following raw materials in parts by weight: 30-40 parts silica fume; 150-250 parts of aluminum sulfate cement; 50-100 parts of silicate cement; 13-18 parts of redispersible latex powder; 100-200 parts of quartz sand; 10-28 parts of modified material; Processing aids 10-30 parts; 40-60 parts water; The modified material consists of silica aerogel particles, pre-dispersed aramid short fiber pulp, and activated rheology modifiers.

2. The composite grouting material for high-durability highway subgrade repair according to claim 1, characterized in that: The activating dispersant is one or more of the following: polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxy-terminated, 3-(tris(hydroxymethyl)methyl)amino-1-propanesulfonic acid, and rosin-modified marinic acid resin dispersion.

3. The composite grouting material for high-durability highway subgrade repair according to claim 2, characterized in that: The activating dispersant is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide α-methoxy-terminated, 3-(tris(hydroxymethyl)methyl)amino-1-propanesulfonic acid, and rosin-modified marinic acid resin dispersion in a weight ratio of 1:(0.5-1):(0.5-2).

4. A high-durability composite grouting material for highway subgrade repair according to claim 1, characterized in that: The modified material is composed of silica aerogel particles, pre-dispersed aramid short fiber pulp and activating agent in a weight ratio of (2-5):(1-3):

1.

5. The composite grouting material for high-durability highway subgrade repair according to claim 1, characterized in that: The processing aids consist of an expanding agent, a water-reducing agent, and an early-strength agent. A combination of one or more of the following: retarder and antifreeze.

6. The composite grouting material for high-durability highway subgrade repair according to claim 5, characterized in that: The expanding agent is one or a combination of multiple types of calcium sulfoaluminate expanding agents, calcium aluminate expanding agents, calcium oxide expanding agents, and magnesium oxide expanding agents.

7. The composite grouting material for high-durability highway subgrade repair according to claim 5, characterized in that: The water-reducing agent is a lignin sulfonate and / or naphthalene sulfonate formaldehyde polymer.

8. The composite grouting material for high-durability highway subgrade repair according to claim 5, characterized in that: The early strength agent is one or more of calcium chloride, sodium sulfate, nitrate, and triethanolamine.

9. A composite grouting material for high-durability highway subgrade repair according to claim 5, characterized in that: The sustained-release agent is one or more of tartaric acid, citric acid and its salts, and sodium gluconate.

10. A grouting material for highway subgrade repair according to any one of claims 1-9, characterized in that, It is prepared by the following method: Weigh out aluminum sulfate cement, silicate cement, expanding agent, water-reducing agent, early strength agent, retarder, modifier, and processing aid according to the weight parts, mix them evenly to obtain the grouting material.

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