Soil solidifying agent, layered pavement structure and construction method therefor

Abstract

Provided are a soil solidifying agent, a layered pavement structure and a construction method therefor. The provided soil solidifying agent can achieve reutilization of solid waste such as waste mineral soil in construction sites and has the characteristics of being low-carbon and environmentally-friendly. In the soil solidifying agent, solid waste, polyacrylamide, a sodium β-naphthalene sulfonate-formaldehyde condensate, N,N-bis(2-hydroxyethyl)isopropanolamine, calcium chloride and a sulfamate high-efficiency water reducing agent achieve a synergistic effect, so that the soil solidifying agent has good solidifying and waterproof capabilities on various types of soil, and can aggregate and solidify loose soil particles no matter under dry conditions or wet conditions, and furthermore, the solidified soil has high compaction density and compressive strength. Therefore, the soil solidifying agent is an ideal low-carbon environmentally-friendly material for heavy-load road construction.

Description

Soil solidifying agent, layered pavement structure and construction method thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2023, with application number 202311861836.6 and invention name “Soil solidifier and layered pavement structure and construction method thereof”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of road construction, and in particular to a soil solidifying agent, a layered pavement structure and a construction method thereof. Background Art

[0004] Currently, the construction of haul roads in mining areas faces the dual pressures of a shortage of building materials and the difficulty of handling waste soil and rock. Furthermore, due to the heavy loads, high frequency, and temporary nature of mining, it is impossible to build and use expensive, fragile, and time-consuming cement concrete and asphalt concrete roads. Therefore, most mining haul roads are still constructed using a simple mixture of stripped waste soil and rock. After construction, most of the haul roads are simple, rough mud-bound gravel roads or even dirt roads.

[0005] However, the pavement strength of mud-bound gravel roads and dirt roads is low and their stability is poor, making it difficult to meet the heavy-load and high-frequency transportation needs of mining areas. In addition, they are less resistant to thawing, freezing, skidding and dust in harsh climatic conditions, which leads to high road maintenance costs and low economic benefits. Summary of the Invention

[0006] In view of this, the present application provides a soil solidifier, a layered pavement structure and a construction method thereof to solve the problems of low pavement strength and poor stability of mining area transportation roads in the prior art.

[0007] In a first aspect, the present application provides a soil solidifying agent, which comprises the following components, calculated by weight percentage based on the total weight of the soil solidifying agent:

[0008] 56% to 75% of solid waste pellets, 0.65% to 6.4% of polyacrylamide, 20% to 27% of sodium beta-naphthalenesulfonate formaldehyde condensate, 11% to 14% of diethanol monoisopropanolamine, 1% to 2.5% of calcium chloride and 0.7% to 2.5% of aminosulfonate high-efficiency water reducer.

[0009] The above-mentioned soil solidifier provided by the present application realizes the reuse of solid wastes such as abandoned mineral soil at the construction site, and has the characteristics of low carbon and environmental protection. In the soil solidifier, solid wastes work synergistically with polyacrylamide, sodium β-naphthalenesulfonate formaldehyde condensate, diethanol monoisopropanolamine, calcium chloride and aminosulfonate high-efficiency water reducer, and has good curing ability and waterproof ability for all kinds of soils. It can aggregate and solidify loose soil particles under dry or wet conditions, and the solidified soil has a high compaction density and compressive strength (the unconfined compressive strength is higher than 2MP 7 days after curing). Therefore, the soil solidifier is an ideal low-carbon and environmentally friendly heavy-duty road construction material.

[0010] The soil solidifier provided in this application is a semi-steel and semi-flexible soil solidifier, which can effectively improve the road strength, freeze-thaw resistance, and anti-skid properties of mining transportation roads when used under heavy loads and harsh climate conditions. It has a good solidification effect on all types of soil. For example, it can have a good solidification effect on silty clay and collapsible loess. At the same time, the soil solidifier contains a high content of solid waste granular materials, which makes full use of common solid waste slag and can replace traditional mining transportation roads with multi-dimensional graded crushed stone and mudstone. Using this soil solidifier, it is possible to realize on-site soil excavation for road construction. Not only is the construction method simple, the construction speed fast, the cost low, and energy-saving and environmentally friendly, but the transportation road after construction has high solidification strength, strong stability, no dust, and no mud. It can better ensure the service life of the road surface itself and reduce the maintenance frequency. It is especially suitable for the construction of medium- and long-term or temporary mining transportation roads required by green mine construction, and can adapt to the new challenges and new requirements of carrying heavy mining vehicles.

[0011] In an optional embodiment, the solid waste granular material includes whole tailings machine-made sand, steel slag, white mud slag powder and gypsum;

[0012] Optionally, the weight ratio of the whole tailings machine-made sand, the steel slag, the white mud slag powder and the gypsum is 1:(2.5-3.0):(1.2-1.5):(3.0-4.0);

[0013] Optionally, the particle size of the whole tailings machine-made sand is 0 to 4.5 mm;

[0014] Optionally, the particle size of the white mud slag powder is 180 to 300 μm.

[0015] In the soil solidifier, whole tailings machine-made sand, steel slag, white mud slag powder, and gypsum are combined in specific proportions to significantly enhance the hydraulic cementing properties of the material. Whole tailings machine-made sand can be obtained by crushing, sand making, and screening low-grade ore, waste rock, and abandoned tailings. The grading requirement is a particle size of 0 to 4.5 mm. The tailings can be selected from coal gangue tailings and granite tailings. In this soil solidifier, the utilization rate of whole tailings machine-made sand is high, which can reduce the operating and maintenance costs of tailings ponds and protect the ecological environment. White mud is the waste residue of paper mills. Papermaking white mud is a reaction product of the alkali recovery section. Its main component is calcium carbonate and has a relatively high silicon content. Using a white mud grinder to grind the calcined white mud to a certain particle size (180 to 300 μm) can reduce wear on vehicle machinery.

[0016] In the soil solidifier, the sodium β-naphthalenesulfonate formaldehyde condensate exhibits excellent thermal stability and acid and alkali resistance, dispersing solid waste within the soil solidifier and ensuring full contact between the solid waste and the soil. The aminosulfonate high-efficiency water reducer exhibits excellent water-reducing and dispersing capabilities, significantly reducing the hydration level of the solidifier, improving the particle pore structure of the solidified soil, increasing its density, and enhancing its impermeability and freeze-thaw resistance. Furthermore, the sodium aminosulfonate polymeric synthetic resin exhibits excellent gloss enhancement, homogenization, and color retention, significantly improving the stain resistance and abrasion resistance of the solidified soil.

[0017] Furthermore, polyacrylamide is a water-soluble polymer with strong flocculating properties, capable of flocculating suspended matter through electrical neutralization. It is also soluble in water in any proportion, exhibiting rapid dissolution, high viscosity, and resistance to degradation and excellent stability during thickening. Diethanol monoisopropanolamine has an excellent grinding aid effect, effectively improving not only the three-day strength of hydraulic cementitious materials but also significantly enhancing their later-stage strength.

[0018] In an optional embodiment, based on the construction cost and purpose of the mine transportation road, the soil solidifier is preferably used with 2% to 5% cement auxiliary material at the construction site to further improve the strength of the transportation road.

[0019] The aminosulfonate superplasticizer involved in this application is a modified or unmodified admixture prepared by reacting and condensing p-aminobenzenesulfonic acid, sodium hydroxide, phenol, and formaldehyde as the main raw materials under certain temperature conditions. The mass ratio of each main raw material can vary within a certain range. For example, the mass ratio of each main raw material can be: 100 parts of p-aminobenzenesulfonic acid, 50-180 parts of sodium hydroxide, 120-210 parts of phenol, 200-600 parts of formaldehyde, and 3000-8000 parts of water. The aminosulfonate superplasticizer can be prepared by the following method:

[0020] First, add water into the reactor and heat it to 45-60°C. Then, add p-aminobenzenesulfonic acid, sodium hydroxide, and phenol to the reactor in sequence and stir to dissolve them completely. Then, add formaldehyde dropwise to the reactor where the materials are located. The addition time is controlled at 40-60 minutes. Next, heat it to 60-120°C, react for 2-4.5 hours, and cool it down to obtain a reddish-brown liquid high-performance water reducer with a concentration of 25%-50% and an average molecular weight of 4000-9500.

[0021] Based on the above preparation method, the prepared aminosulfonate high-efficiency water reducer can be modified in various ways to make it have better performance in certain aspects. The modification methods are known in the art and will not be described in detail in this application.

[0022] In a second aspect, the present application provides the use of the above-mentioned soil solidifying agent in road construction.

[0023] In an optional embodiment, the road is a mining transportation road.

[0024] In a third aspect, the present application provides a layered pavement structure, which includes at least one solidified material layer, wherein the solidified material layer is formed by solidifying raw materials including soil and the above-mentioned soil solidifying agent.

[0025] In an optional embodiment, in the solidified material layer, the weight of the soil solidifying agent is 6-15% of the weight of the soil.

[0026] In an optional embodiment, the layered pavement structure includes three layers of solidified material, which are, from top to bottom, a surface layer, a base layer, and a subbase layer; wherein,

[0027] In the surface layer, the weight of the soil solidifier is 12-15% of the weight of the soil; the thickness of the surface layer is 10-15 cm;

[0028] and / or, in the base layer, the weight of the soil solidifier is 8-10% of the weight of the soil; the thickness of the base layer is 28-33 cm;

[0029] And / or, in the subbase layer, the weight of the soil solidifier is 6-8% of the weight of the soil; and the thickness of the subbase layer is 20-25 cm.

[0030] In an optional embodiment, the content of the solid waste particles in the soil solidifying agent gradually increases in each solidified layer from the surface layer to the subbase layer, thereby effectively improving the strength of the pavement structure.

[0031] The above-mentioned layered pavement structure provided in this application can make the strength of the mining area transportation road reach 18 to 23MPa, and it will not raise dust when the vehicle runs, the blisters will not crack, and it will not sink under long-term load. The soil can be taken on site, thereby maximizing the economic benefits of resource utilization and saving a lot of capital investment.

[0032] In a fourth aspect, the present application provides a method for constructing the above-mentioned layered pavement structure, comprising the following steps:

[0033] Determine the optimal ratio of the components in the soil solidifier based on the physical and chemical properties of the soil at the working surface;

[0034] Determining the actual amount of each component in the soil solidifying agent based on the optimal ratio and the preset parameters of the layered pavement structure;

[0035] Pre-treating the working surface so that the soil particle size in the working surface is less than 5 mm, the loose laying coefficient is 1.53 to 1.58, and the moisture content is 25 to 30%;

[0036] Spreading the solid waste pellets on the working surface according to the actual amount, stirring and adding water after spreading to mix and suffocate the material;

[0037] After the suffocation is completed, cement and the remaining components of the soil solidifier are continued to be spread on the working surface according to the actual amount. After the spreading is completed, stirring, mixing, shaping, rolling and curing are carried out.

[0038] In an optional embodiment, soil can be collected on site and tested according to the properties of the construction roadbed soil to measure the physical and chemical properties of the working surface soil, such as soil pH, particle analysis, bulk density, compressive strength, plasticity index, optimum moisture content and maximum dry density.

[0039] In an optional embodiment, the preset parameters of the layered pavement structure may be the number of cured material layers, the pavement width, the thickness of each cured material layer, etc.

[0040] In an optional embodiment, when performing the pretreatment on the working surface, a rotary tiller can be used to loosen the original road surface of the working surface, loosening it 1 to 2 times so that the particle size of the soil in the working surface is less than 5 mm, and the soil material is spread according to a loosening coefficient of 1.53 to 1.58. The base is leveled with a grader, and the moisture content is measured on site. According to the amount of water required for the road section, a sprinkler truck is used in conjunction with calculation personnel to replenish water to the road section to replenish the water to 25% to 30%.

[0041] In an alternative embodiment, during the mixing and saturation, the solid waste pellets can be dry-mixed in proportion to obtain a dry mix, which is then spread. Water is then added during the agitation process with a rotary tiller, and the mixing and saturation are continued in accordance with the "Testing Procedure for Stabilized Inorganic Binders for Highway Engineering" (TTGE51-2009). During on-site mixing, loaders and other mining vehicles must not crush the pile to prevent lumps and affect uniform mixing.

[0042] In an optional embodiment, after continuing to spread cement and the remaining components of the soil solidifier on the working surface, a rotary tiller and a road mixer may be used to mix them evenly. Since the moisture content is too low, water may be added again after mixing once to fully replenish the moisture into the solidified soil.

[0043] (1) Use a rotary tiller to mix the mixture evenly and thoroughly for at least 3 times, and make sure the mixture has a uniform color. The mixing depth should be determined based on the construction thickness requirements, and the mixture should be mixed from both sides to the center until the solidified bottom layer is reached. Each mixing should be overlapped and thoroughly turned, and no missing parts should be allowed, and the roadbed should not be cut.

[0044] (2) Use a road mixer to mix the soil. Mix from both sides toward the center and reach about 1 cm below the solidified bottom layer. Each mixing should be done with overlapping and thorough mixing. No missing mixes should be allowed. The color of the solidified soil should remain consistent. No unmixed soil layer should be left between the base layer and the subbase layer.

[0045] Taking into account the complex conditions of the construction site, the actual moisture content of the soil on the working surface changes from time to time. The amount of soil solidifying materials and cement added should be adjusted in real time during the construction process. The solidifying materials should not be too concentrated during the mixing process, otherwise it will affect the penetration ability of the curing agent and make it difficult to mix the materials evenly.

[0046] In an optional embodiment, the shaping may include: after stirring and mixing, using straight wooden or iron bars for preliminary shaping; in straight sections, it should be scraped from both sides to the center; in flat curved sections, it should be scraped from the inside to the outside; during the shaping process, manual cooperation should be used to eliminate the segregation of coarse and fine materials.

[0047] In an optional embodiment, the rolling and shaping process may include: the shaped mixture should be rolled and shaped at the optimal moisture content using a 15T vibratory roller with rear rubber wheels and front steel wheels; first statically compacting the mixture once, then removing the top layer of soil that has been rolled twice with a scraper, vibrating and rolling the mixture twice, scraping the surface with a scraper once, and finally statically compacting the mixture twice to finish. During the rolling process, if elastic soil, looseness, or peeling occur, timely measures should be taken. In addition, on sunny and windy days, if the moisture content is not maintained well and fish scale patterns appear on some road surfaces, after the rolling process, watering and letting it sit for 1 hour before statically compacting the surface for a further layer will achieve better results.

[0048] In an optional embodiment, the maintenance may include: After the surface treatment of the mining area haul road is completed, it should be covered with straw mats, wheat straw, straw bags, etc. Watering should not be done immediately. Generally, watering or soaking maintenance should begin 12 to 24 hours later (depending on weather conditions). The maintenance period should not be less than 7 days, and water should be sprayed 6 to 8 times per day to keep the surface moist. When watering, be careful not to directly impact the road surface with water. Heavy vehicles and heavy objects are not allowed to enter the road during the maintenance period. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0050] FIG1 is a pavement structure diagram of the transport road finally constructed in an embodiment of the present application. DETAILED DESCRIPTION

[0051] The following examples are provided to further better understand the present application, but are not limited to the best implementation mode described herein, and do not limit the content and protection scope of the present application. Any product identical or similar to the present application obtained by anyone under the inspiration of the present application or by combining the features of the present application with other prior arts shall fall within the scope of protection of the present application.

[0052] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in this field can be used. If the manufacturer of the reagents or instruments is not specified, they are all commercially available conventional reagents.

[0053] The present application is further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in this application.

[0054] The formula of the aminosulfonate high-efficiency water reducer involved in the examples and comparative examples of the present application is as follows: 1 kg of p-aminobenzenesulfonic acid, 1.2 kg of sodium hydroxide, 1.9 kg of phenol, 5.5 kg of formaldehyde, and 55 kg of water.

[0055] Example

[0056] The demonstration road section in this example is a haul road located within a copper mining area. Located at an altitude of over 3,000 meters, it receives an average annual rainfall of approximately 450 mm, with rainfall primarily concentrated between July and September. The existing haul road is a dirt road, requiring near-daily watering and dust control. The demonstration road section in this example is designed to be 2 km long and 6.5 m wide. The road is required to accommodate 60-100 t mining trucks and have an eight-year service life. Because the copper mining area is adjacent to an ecological and environmental protection zone, hardened pavement is not acceptable, environmental protection requirements are high, and the budget is relatively low.

[0057] The demonstration road section of this embodiment is constructed according to the following steps:

[0058] (1) Physical and chemical property test: More than 600 kg of mining soil was weighed from the construction site and brought back to the laboratory. Indoor tests were conducted based on the properties of the construction roadbed soil. The soil's physical and chemical properties, such as particle analysis, pH value, and compressive strength, were measured to obtain the optimal moisture content and maximum dry density of the mining soil. The test results are shown in Table 1. At the same time, the optimal ratio of each component in the soil solidifier was determined through mining soil solidifier ratio tests, freeze-thaw tests, and water stability tests.

[0059] Table 1 Test results of physical and chemical properties of soil in the mining area

[0060] The particle analysis results and plasticity index in Table 1 show that the soil in the copper mining area is silty clay. The maximum dry density of the soil in the copper mining area combined with the soil solidifier material is 1.862 g / cm 3 , the optimal moisture content is 18.92%.

[0061] (2) Determination of preset parameters of layered pavement structure, amount of soil solidifier added and optimal ratio:

[0062] Surface layer: The amount of soil solidifier added is 15% of the mass of the soil to be solidified, and the surface layer thickness is 12 cm. The soil solidifier ratio is: 56% solid waste aggregate (the weight ratio of whole tailings machine-made sand, steel slag, white mud slag powder, and gypsum is 1:2.5:1.5:4), 1.3% polyacrylamide, 24% sodium β-naphthalenesulfonate formaldehyde condensate, 11.0% diethanol monoisopropanolamine, 1.2% calcium chloride, 2.5% aminosulfonate high-efficiency water reducer, and 4% cement auxiliary material.

[0063] Base layer: The amount of soil solidifier added is 10% of the mass of the soil to be solidified, and the base layer thickness is 28cm. The soil solidifier ratio is: 63% solid waste aggregate (the weight ratio of whole tailings machine-made sand, steel slag, white mud slag powder, and gypsum is 1:2.5:1.5:3), 1.8% polyacrylamide, 20% sodium β-naphthalenesulfonate formaldehyde condensate, 11.0% diethanol monoisopropanolamine, 1.0% calcium chloride, 1.2% aminosulfonate high-efficiency water reducer, and 2% cement auxiliary material.

[0064] Subbase layer: The amount of soil solidifier added is 8% of the mass of the soil to be solidified, and the thickness of the subbase layer is 20 cm; among them, the ratio of soil solidifier is: solid waste aggregate (the weight ratio of whole tailings machine-made sand, steel slag, white mud slag powder and gypsum is 1:3.0:1.2:3) 65%, polyacrylamide 0.70%, sodium β-naphthalenesulfonate formaldehyde condensate 20%, diethanol monoisopropanolamine 11.0%, calcium chloride 2.0%, aminosulfonate high-efficiency water reducer 1.3%.

[0065] (3) The process scheme for paving heavy-load transportation roads in mines using soil solidifiers includes the following steps:

[0066] S1. According to the process parameters determined in step (2), the actual amount of raw materials such as the required paving soil, cement, whole tailings machine-made sand (particle size not exceeding 4.5 mm), steel slag, white mud slag powder (particle size of 180-300 μm), gypsum, polyacrylamide, β-naphthalenesulfonate formaldehyde condensate, diethanol monoisopropanolamine, calcium chloride, and aminosulfonate superplasticizer is calculated, and the materials are prepared for paving;

[0067] S2. Excavate the roadbed, prepare the site, lay out the center line and side lines on the roadbed, set up stakes every 15-20 meters, mark the stakes, conduct elevation measurements, and mark the design height of the road surface and the loose-laying height of the mixture. Then, use a rotary tiller to till the soil twice to reduce the particle size in the mining area to less than 5mm. Then, spread the mixture according to the loose-laying coefficient of 1.58. Based on the required water volume of the road section, use a sprinkler truck in conjunction with calculation personnel to carry out the first watering operation on the road section, replenishing the water content to 25%. After stirring with the rotary tiller, use a grader to level the road.

[0068] S3, dry-mixing the whole tailings machine-made sand, steel slag, white mud slag powder, gypsum and other solid waste particles in proportion to obtain a dry mixed material, and spreading the obtained dry mixed material, and then adding water for the second time during the stirring process of the rotary tiller, and further uniformly mixing and stuffing the material;

[0069] S4, on the basis of step S3, polyacrylamide, sodium β-naphthalenesulfonate formaldehyde condensate, diethanol monoisopropanolamine, calcium chloride, sodium sulfamate polymer synthetic resin and cement are paved in sequence according to the proportion. After all paving is completed, a road mixer is used to stir evenly. Mixing should be mixed from both sides to the center and reach about 1 cm of the solidified bottom layer. Each mixing should have overlapping and turning through, and no leakage should be allowed. The color of the solidified soil mixing should remain consistent, and no unmixed plain soil interlayer should be left between the base and the subbase. If the moisture content of the solidified soil is too low, continue stirring once and add water once so that the moisture is fully supplemented in the solidified soil.

[0070] S5. After the mixtures in steps S3 and S4 are evenly mixed and spread, use straight wooden or iron strips to perform preliminary shaping immediately. In straight sections, the surface should be leveled from both sides to the center. In flat curved sections, the surface should be leveled from the inside to the outside.

[0071] S6. After the shaping is completed, the heavy roller starts working and uses the heavy roller to roll and shape the road surface. First, static compaction is performed once, and then the scraper removes the surface soil layer that has been rolled twice, and then the vibratory roller is used to roll twice, and the scraper is used to scrape the surface once. Finally, static compaction is performed twice to finish the surface, and the compaction degree is controlled to be greater than 95%. During the rolling process, if elastic soil, looseness, or peeling occurs, timely treatment measures should be taken. If the moisture content is not maintained well and fish scales appear on some road surfaces, after the rolling is completed, sprinkle water and wait for 1 hour before static compaction for a better effect.

[0072] S7. Repeat steps S1-S6, laying the subbase, base, and surface layers in sequence. After the surface layer is prepared, build a 30cm wide and 5cm deep drainage ditch on the side of the solidified soil to facilitate rainwater drainage from the road during rain and avoid damage to the roadbed. Then, cover the road with straw mats, wheat straw, straw bags, etc. Do not water it immediately. Start watering and curing after 24 hours (depending on weather conditions). The curing period should not be less than 7 days, and water 6-8 times a day to keep the surface moist. When watering, be careful not to directly impact the road surface with water, and do not allow heavy vehicles or heavy objects to enter during the curing period.

[0073] The pavement structure of the transport road finally constructed in this embodiment is shown in FIG1 .

[0074] Comparative Example 1

[0075] The transport road was constructed according to the method of the embodiment, except that in step (2) of this comparative example, the soil solidifying agents in step (2) of the embodiment were replaced by equal amounts of commercially available common solidifying agents (2 parts by weight of lime, 8 parts by weight of cement, 45 parts by weight of potassium chloride, 36 parts by weight of calcium chloride, and 15 parts by weight of sodium silicate).

[0076] Comparative Example 2

[0077] The transport road was constructed according to the method of the embodiment, except that the soil solidifying agents involved in step (2) of this comparative example did not contain polyacrylamide.

[0078] Comparative Example 3

[0079] The transport road was constructed according to the method of the embodiment, except that the soil solidifying agents involved in step (2) of this comparative example did not contain sodium β-naphthalenesulfonate formaldehyde condensate.

[0080] Comparative Example 4

[0081] The transport road was constructed according to the method of the embodiment, except that, in step (2) of this comparative example, the soil solidifying agents involved did not contain diethanol monoisopropanolamine.

[0082] Comparative Example 5

[0083] The transport road was constructed according to the method of the embodiment, except that in step (2) of this comparative example, the soil solidifying agents involved did not contain calcium chloride.

[0084] Comparative Example 6

[0085] The transport road was constructed according to the method of the embodiment, except that in step (2) of this comparative example, the soil solidifying agents involved did not contain aminosulfonate high-efficiency water reducing agent.

[0086] Test Case

[0087] On-site inspections were carried out on the 7th, 14th and 28th days after the completion of construction of each transport road. Samples were taken at every other section for performance testing. The results are shown in Tables 2 to 6.

[0088] Table 2 Unconfined compressive strength test results

[0089] Table 3 Freeze-thaw test results

[0090] Table 4 Water stability test results

[0091] Table 5 Test results of compressive rebound modulus

[0092] Table 6 Flexural tensile (splitting) strength test results

[0093] It can be seen from Tables 2 to 6 that, compared with commercially available soil solidifiers, the soil solidifier of the present application can significantly improve the various performances of mining area transportation roads.

[0094] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A soil stabilizer, characterized in that, The soil stabilizer comprises the following components in terms of weight percentage of the total weight of the soil stabilizer: 56% - 75% of solid waste granular materials, 0.65% - 6.4% of polyacrylamide, 20% - 27% of β-naphthalenesulfonic acid sodium formaldehyde condensate, 11% - 14% of diethanol monoisopropanolamine, 1% - 2.5% of calcium chloride, and 0.7% - 2.5% of amino sulfonate superplasticizer; The solid waste granular materials include all-tailings manufactured sand, steel slag, white mud slag powder, and gypsum; The weight ratio of the all-tailings manufactured sand, the steel slag, the white mud slag powder, and the gypsum is 1:(2.5 - 3.0):(1.2 - 1.5):(3.0 - 4.0).

2. The soil stabilizer according to claim 1, wherein, The particle size of the all-tailings manufactured sand is 0 - 4.5 mm.

3. The soil stabilizer according to claim 1, characterized in that, The particle size of the white mud slag powder is 180 - 300 μm. Use of the soil stabilizer according to any one of claims 1 to 3 in road construction.

5. The use according to claim 4, characterized in that, The road is a mining area transportation road.

6. A layered pavement structure, characterized in that, The layered pavement structure includes at least one cured layer, and the cured layer is formed by curing raw materials including soil and the soil stabilizer according to any one of claims 1 to 3.

7. The layered pavement structure according to claim 6, characterized in that, In the cured layer, the weight of the soil stabilizer is 6 - 15% of the weight of the soil.

8. The layered pavement structure according to claim 6 or 7, characterized in that, The layered pavement structure includes three cured layers, which are, from top to bottom, the surface layer, the base layer, and the sub-base layer; wherein, In the surface layer, the weight of the soil stabilizer is 12 - 15% of the weight of the soil; the thickness of the surface layer is 10 - 15 cm; And / or, in the base layer, the weight of the soil stabilizer is 8 - 10% of the weight of the soil; the thickness of the base layer is 28 - 33 cm; And / or, in the sub-base layer, the weight of the soil stabilizer is 6 - 8% of the weight of the soil; the thickness of the sub-base layer is 20 - 25 cm.

9. The layered pavement structure according to claim 8, characterized in that, In the order from the surface layer to the sub-base layer, in each of the cured layers, the content of the solid waste granular materials in the soil stabilizer gradually increases.

10. A method for constructing the layered pavement structure according to any one of claims 6 to 9, characterized in that, Comprising the following steps: Based on the physical and chemical properties of the soil on the working surface, determine the optimal ratio of each component in the soil stabilizer; Based on the optimal ratio and the preset parameters of the layered pavement structure, determine the actual dosage of each component in the soil stabilizer; Pre-treat the working surface so that the particle size of the soil in the working surface < 5 mm, the loose paving coefficient is 1.53 - 1.58, and the water content is 25 - 30%; According to the actual dosage, spread the solid waste granular materials on the working surface, and after spreading, stir and add water to perform mixing and material retting; After the material retting is completed, according to the actual dosage, continue to spread cement and the remaining components in the soil stabilizer on the working surface, and after spreading, stir and mix evenly, shape, roll and form, and cure.

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