Soil Stabilizer and Layered Pavement Structure and Its Construction Method

Abstract

The present invention relates to the technical field of road construction, and specifically relates to a soil stabilizer, a layered road surface structure and a construction method thereof. The soil stabilizer provided by the present invention realizes the reuse of solid wastes such as waste mine soil at the construction site, and has the characteristics of low carbon and environmental protection. In this soil stabilizer, the solid waste synergistically acts with polyacrylamide, β-naphthalene sulfonate formaldehyde condensate, diethanol monoisopropanolamine, calcium chloride and amino sulfonate superplasticizer, and has good solidification ability and waterproof ability for various soils. It can aggregate and solidify loose soil particles under both dry and wet conditions, and the solidified soil has a high compaction density and compressive strength (the unconfined compressive strength after 7 days of solidification is higher than 2MP). Therefore, this soil stabilizer is an ideal low-carbon and environmentally friendly heavy-duty road construction material.

Description

Technical Field

[0001] The present invention relates to the technical field of road construction, and particularly relates to a soil solidifying agent, a layered road surface structure and a construction method thereof. Background Art

[0002] Currently, the construction of mining area transportation roads faces the dual pressures of scarce building materials and difficult treatment of waste earth and rock. Moreover, due to the special properties of heavy load, high frequency and temporary nature, it is impossible to construct and use expensive and fragile cement concrete roads and asphalt concrete roads with a relatively long construction period. Therefore, at present, most mining area transportation roads still use the mixture of waste earth and rock stripped out for simple construction, and the constructed transportation roads are mostly simple and rough mud-bound macadam roads or even dirt roads.

[0003] However, the mud-bound macadam roads and dirt roads have low pavement strength and poor stability, and are difficult to meet the transportation needs of heavy load and high frequency in mining areas. Moreover, their frost resistance, skid resistance and anti-dust effects are poor under harsh climate conditions, which leads to high road maintenance costs and low economic benefits. Summary of the Invention

[0004] In view of this, the present invention provides a soil solidifying agent, a layered road surface 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.

[0005] In a first aspect, the present invention provides a soil solidifying agent. Calculated by weight percentage of the total weight of the soil solidifying agent, the soil solidifying agent comprises the following components:

[0006] 56% - 75% of solid waste particles, 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.

[0007] The above soil solidifying agent provided by the present invention realizes the reuse of solid wastes such as waste mine soil at the construction site and has the characteristics of low carbon and environmental protection. In this soil solidifying agent, the solid waste, polyacrylamide, β-naphthalenesulfonic acid sodium formaldehyde condensate, diethanol monoisopropanolamine, calcium chloride and amino sulfonate superplasticizer work together to have good solidifying ability and waterproof ability for various soils, and can make loose soil particles aggregate and solidify under both dry and wet conditions. Moreover, the solidified soil has a high compaction density and compressive strength (the unconfined compressive strength after 7 days of solidification is higher than 2 MPa). Therefore, this soil solidifying agent is an ideal low-carbon and environmentally friendly heavy-duty road construction material.

[0008] The above soil stabilizer provided by the present invention belongs to a semi-steel and semi-flexible soil stabilizer, which can effectively improve the road strength, frost resistance, skid resistance and other properties of the mining area transportation road under heavy load and harsh climate conditions, and has a good solidification effect on various soils. For example, it can have a good solidification effect on silty clay and collapsible loess. At the same time, the soil stabilizer contains a high content of solid waste particles, makes full use of common solid waste slag, and can replace the traditional multi-dimensional graded gravel and mud-bound stone for mining area transportation roads. Using this soil stabilizer, on-site soil can be used for road construction, which not only has a simple construction method, fast construction speed, low cost, energy conservation and environmental protection, but also the solidification strength of the constructed transportation road is high, the stability is strong, there is no dust and no mud, which can better ensure the service life of the road surface itself, reduce the maintenance frequency, and is especially suitable for constructing medium- and long-term or temporary mining area transportation roads required by green mine construction, and can adapt to the new challenges and requirements of bearing heavy mining vehicles.

[0009] In an alternative embodiment, the solid waste particles include all-tailings manufactured sand, steel slag, white mud slag powder and gypsum;

[0010] Optionally, 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);

[0011] Optionally, the particle size of the all-tailings manufactured sand is 0 - 4.5 mm;

[0012] Optionally, the particle size of the white mud slag powder is 180 - 300 μm.

[0013] In the above soil stabilizer, the all-tailings manufactured sand, steel slag, white mud slag powder and gypsum are used in a specific proportion combination, which can significantly improve the hydraulic cementitious property of the material. Among them, the all-tailings manufactured sand can be prepared by crushing, sand making and screening of low-grade ores, waste rocks and waste tailing materials, and the particle size requirement of the grading is 0 - 4.5 mm. The tailings are preferably coal gangue tailings and granite tailings. In this soil stabilizer, the utilization rate of the all-tailings manufactured sand is high, which can reduce the operation and maintenance costs of the tailing pond and protect the ecological environment. The white mud is the white mud waste residue of the paper mill. The papermaking white mud is the reaction product of the alkali recovery section, mainly composed of calcium carbonate, and the silicon content is also relatively high. After grinding the calcined white mud to a certain particle size (180 - 300 μm) by using a white mud mill, the wear of the vehicle machinery can be reduced.

[0014] In the above soil stabilizer, the β-naphthalene sulfonate formaldehyde condensate has good thermal stability and acid and alkali resistance, can disperse the solid waste in the soil stabilizer, and promote the full contact between the solid waste and the soil. The amino sulfonate superplasticizer has good water-reducing and dispersing ability, can greatly reduce the hydration degree of the stabilizer, improve the particle pore structure of the solidified soil, increase its density, and improve its impermeability and freeze-thaw resistance. At the same time, the amino sulfonate polymer synthetic resin also has good light-enhancing, homogenizing, and color-preserving functions, and can significantly improve the stain resistance and wear resistance of the solidified soil.

[0015] In addition, polyacrylamide is a water-soluble polymer with strong flocculation ability, which can cause suspended substances to flocculate through electro-neutralization. At the same time, polyacrylamide can be dissolved in water in any proportion, with a fast dissolution rate, high viscosity, and good thickening, non-degradable, and good stability. Diethanol monoisopropanolamine has excellent grinding aid effect, which can not only effectively improve the 3-day strength of hydraulic cementitious raw materials, but also greatly improve the later strength.

[0016] In an optional embodiment, according to the construction cost and use of the mine transportation road, the above soil stabilizer has better use effect when used with 2% - 5% of cement auxiliary materials at the construction site, and can further improve the strength of the transportation road.

[0017] The amino sulfonate superplasticizer involved in the present invention is a modified or unmodified admixture formed by reacting and condensing p-aminobenzenesulfonic acid, sodium hydroxide, phenol, and formaldehyde as main raw materials under certain temperature conditions. Among them, the mass ratio of each main raw material can vary within a certain range. For example, the mass ratio range 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 amino sulfonate superplasticizer can be prepared by the following method:

[0018] First, add water to the reaction kettle and heat it to 45 - 60 °C, then sequentially add p-aminobenzenesulfonic acid, sodium hydroxide, and phenol to the reaction kettle, stir to dissolve them all, then dropwise add formaldehyde to the reaction kettle where the material is located, and control the dropping time within 40 - 60 min. Next, raise the temperature to 60 - 120 °C, and the reaction time is 2 - 4.5 h. Cool down to obtain a high-performance red-brown liquid superplasticizer with a concentration of 25% - 50% and an average molecular weight of 4000 - 9500.

[0019] Based on the above preparation method, various modifications can also be made to the prepared amino sulfonate superplasticizer to make it have more excellent performance in some aspects. The modification methods can be known in the field, and the present invention will not elaborate.

[0020] Second aspect, the present invention provides the use of the above soil curing agent in road construction.

[0021] In an alternative embodiment, the road is a mining area transportation road.

[0022] Third aspect, the present invention provides a layered road surface structure, which includes at least one cured layer, and the cured layer is formed by curing raw materials including soil and the above soil curing agent.

[0023] In an alternative embodiment, in the cured layer, the weight of the soil curing agent is 6-15% of the weight of the soil.

[0024] In an alternative embodiment, the layered road surface structure includes three cured layers, which are, from top to bottom, a surface layer, a base layer, and a sub-base layer; wherein,

[0025] In the surface layer, the weight of the soil curing agent is 12-15% of the weight of the soil; the thickness of the surface layer is 10-15 cm;

[0026] And / or, in the base layer, the weight of the soil curing agent is 8-10% of the weight of the soil; the thickness of the base layer is 28-33 cm;

[0027] And / or, in the sub-base layer, the weight of the soil curing agent is 6-8% of the weight of the soil; the thickness of the sub-base layer is 20-25 cm.

[0028] In an alternative embodiment, in the order from the surface layer to the sub-base layer, in each of the cured layers, the content of the solid waste particles in the soil curing agent gradually increases. In this way, the strength of the road surface structure can be effectively improved.

[0029] The above layered road surface structure provided by the present invention can make the strength of the mining area transportation road reach 18 to 23 MPa, and the vehicle will not raise dust when running, will not crack when soaked in water, will not sink under long-term load, and the soil can be taken locally on site, achieving the maximum economic benefits of resource utilization and saving a large amount of capital investment.

[0030] Fourth aspect, the present invention provides a construction method for the above layered road surface structure, including the following steps:

[0031] Based on the physical and chemical properties of the soil on the working surface, determine the optimal ratio of each component in the soil curing agent;

[0032] Based on the optimal ratio and the preset parameters of the layered road surface structure, determine the actual dosage of each component in the soil curing agent;

[0033] Pre-treat the working surface so that the particle size of the soil in the working surface is < 5 mm, the loose paving coefficient is 1.53 - 1.58, and the water content is 25 - 30%;

[0034] Spread the solid waste granular material on the working surface according to the actual dosage. After spreading, stir and replenish water to carry out mixing and material retting;

[0035] After the material retting is completed, continue to spread cement and the remaining components of the soil curing agent on the working surface according to the actual dosage. After spreading, stir and mix evenly, shape, roll and form, and cure.

[0036] In an alternative embodiment, soil can be taken on-site, tested according to the properties of the subgrade soil for construction, and the physical and chemical properties of the soil on the working surface are measured, such as soil pH value, particle analysis, bulk density, compressive strength, plasticity index, optimum moisture content, and maximum dry density.

[0037] In an alternative embodiment, the preset parameters of the layered pavement structure can be the number of cured material layers, pavement width, thickness of each cured material layer, etc.

[0038] In an alternative embodiment, when pre-treating the working surface, a rotary tiller can be used to loosen the original pavement of the working surface, loosen it 1 - 2 times, so that the particle size of the soil in the working surface is < 5 mm, spread the soil material according to a loose paving coefficient of 1.53 - 1.58, scrape the base with a grader, and measure the moisture content on-site. The watering truck and calculation personnel are coordinated to carry out water replenishment operations on the section according to the water required for the section, and supplement the moisture to 25% - 30%.

[0039] In an alternative embodiment, when carrying out the mixing and material retting, the solid waste granular material can be dry-mixed in proportion to obtain a dry-mixed mixture, and the obtained dry-mixed mixture is spread. Then, water is replenished during the stirring process of the rotary tiller to carry out mixing and material retting, and it is operated according to the "Test Regulations for Inorganic Binding Material Stabilized Materials in Highway Engineering" (TTGE51 - 2009). When constructing on-site with loaders and other mining area vehicles, the material piles shall not be rolled to avoid caking and affecting the even mixing.

[0040] In an alternative embodiment, after continuing to spread cement and the remaining components of the soil curing agent on the working surface, a rotary tiller and a road mixer can be used to stir evenly. Due to the too low moisture content, add water once again after stirring once to make the moisture fully supplement into the cured soil:

[0041] (1) Use a rotary tiller to mix and turn over the mixture evenly for no less than 3 times until the mixing color is consistent. According to the requirements of the construction thickness, determine the mixing depth, mix from both sides to the center, and reach the solidified bottom layer. Each mixing should have overlap and thorough turning, and there should be no missed mixing or cutting of the roadbed.

[0042] (2) Use a road mixer to mix. The mixing should be from both sides to the center and reach about 1 cm of the solidified bottom layer. Each mixing should have overlap and thorough turning, and there should be no missed mixing. Also, the color of the solidified soil mixture should remain consistent, and there should be no unmixed plain soil interlayer between the base course and the sub-base course.

[0043] Considering the complex conditions at the construction site, the actual water content of the working surface soil changes from time to time. During the construction process, the addition amounts of the soil solidifying material and cement should be adjusted in real time. During the mixing process, the solidifying material should not be too thick, otherwise it will affect the penetration ability of the curing agent and make it difficult to mix the materials evenly.

[0044] In an optional implementation manner, the shaping may include: after stirring and mixing evenly, use a straight wooden strip or iron strip for preliminary shaping; in the straight section, scrape from both sides to the center; in the horizontal curve section, scrape from the inside to the outside; during the shaping process, manual cooperation should be used to eliminate the segregation of coarse and fine materials.

[0045] In an optional implementation manner, the rolling and forming may include: for the mixed material after shaping, at the optimal moisture content, use a 15T vibratory roller with a rear rubber wheel and a front steel wheel to roll and form; first, statically press 1 time, then use a grader to scrape off the soil layer rolled twice on the surface, vibrate and roll 2 times, use a grader to scrape and level 1 time, and finally statically press twice for finishing. During the rolling process, when phenomena such as elastic soil, looseness, and peeling occur, corresponding treatment measures should be taken in a timely manner. In addition, in sunny and windy environments, if the moisture content is not well maintained and fish-scale patterns appear on some parts of the road surface during rolling, after rolling, sprinkle water and let it stand still for 1 h and then statically press another layer, which will have a better effect.

[0046] In an optional implementation manner, the curing may include: after the surface treatment of the mining area transportation road is completed, use straw curtains, wheat straw, grass bags, etc. for covering treatment. It is not advisable to sprinkle water immediately. Generally, start sprinkling water or soaking for curing (depending on weather changes) after 12 - 24 h. The curing period shall not be less than 7 d, sprinkle water 6 - 8 times a day to keep the surface moist. When sprinkling water, pay attention not to directly impact the road surface with water. No heavy vehicles or heavy objects are allowed during the curing period. Description of the Drawings

[0047] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0048] Figure 1 It is the structural diagram of the transportation road pavement finally constructed in the embodiment of the present invention. Specific embodiments

[0049] The following embodiments are provided to better further understand the present invention, which are not limited to the best embodiments, and do not limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior art features falls within the protection scope of the present invention.

[0050] For those not specifying the specific experimental steps or conditions in the embodiments, the operations or conditions of the conventional experimental steps described in the literature in this field can be followed. For the reagents or instruments not indicating the manufacturer, they are all conventional reagent products that can be obtained through commercial purchase.

[0051] The following further describes the present invention in detail with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present invention.

[0052] The formulations of the aminosulfonate superplasticizer involved in the embodiments and comparative examples of the present invention are 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.

[0053] Embodiment

[0054] The demonstration section of this embodiment is a transportation road located in a copper mine area, with an altitude of more than 3000 meters, an average annual precipitation of about 450 mm, and the precipitation time mainly concentrated in July to September. The original transportation road was a dirt road, and almost daily watering was required for dust prevention. The designed total length of the demonstration section of this embodiment is 2 km and the width is 6.5 m. It is required that the obtained road meet the driving requirements of 60 - 100 t load-carrying mining trucks, with a service life of 8 years. Since this copper mine area is adjacent to the ecological protection area and does not accept hardened pavements, the environmental protection requirements are high and the budget is low.

[0055] Construct the demonstration section of this embodiment according to the following steps:

[0056] (1) Physical and chemical property tests: More than 600 kg of mining area soil was taken from the construction site back to the laboratory, and indoor tests were carried out according to the properties of the subgrade soil for construction to determine the physical and chemical properties such as particle analysis, pH value and compressive strength of the soil, and the optimum moisture content and maximum dry density of the mining area soil were obtained. The test results are shown in Table 1. At the same time, through the proportioning experiment, freeze-thaw experiment and water stability experiment of the soil stabilizer for the mining area, the best proportion of each component in the soil stabilizer was determined.

[0057] Table 1 Test results of physical and chemical properties of mining area soil

[0058]

[0059] It can be seen from the particle analysis results and plasticity index in Table 1 that the soil in this copper mining area is silty clay. Through the heavy compaction test of solidified soil, the maximum dry density of the soil in this copper mining area combined with the soil stabilizer material is 1.862 g / cm 3 , and the optimum moisture content is 18.92%.

[0060] (2) Determination of preset parameters of layered pavement structure, incorporation amount and best proportion of soil stabilizer:

[0061] Surface layer: The incorporation amount of soil stabilizer is 15% of the mass of the soil to be solidified, and the surface layer thickness is 12 cm; among them, the soil stabilizer proportion is: solid waste granular material (the weight ratio of all-tailings machine-made sand, steel slag, white mud slag powder, and gypsum is 1:2.5:1.5:4) 56%, polyacrylamide 1.3%, β-naphthalenesulfonic acid sodium formaldehyde condensate 24%, diethanol monoisopropanolamine 11.0%, calcium chloride 1.2%, amino sulfonate superplasticizer 2.5%, and another 4% cement auxiliary material;

[0062] Base layer: The incorporation amount of soil stabilizer is 10% of the mass of the soil to be solidified, and the base layer thickness is 28 cm; among them, the soil stabilizer proportion is: solid waste granular material (the weight ratio of all-tailings machine-made sand, steel slag, white mud slag powder, and gypsum is 1:2.5:1.5:3) 63%, polyacrylamide 1.8%, β-naphthalenesulfonic acid sodium formaldehyde condensate 20%, diethanol monoisopropanolamine 11.0%, calcium chloride 1.0%, amino sulfonate superplasticizer 1.2%, and another 2% cement auxiliary material;

[0063] Sub-base layer: The incorporation amount of soil stabilizer is 8% of the mass of the soil to be solidified, and the sub-base layer thickness is 20 cm; among them, the soil stabilizer proportion is: solid waste granular material (the weight ratio of all-tailings machine-made sand, steel slag, white mud slag powder, and gypsum is 1:3.0:1.2:3) 65%, polyacrylamide 0.70%, β-naphthalenesulfonic acid sodium formaldehyde condensate 20%, diethanol monoisopropanolamine 11.0%, calcium chloride 2.0%, amino sulfonate superplasticizer 1.3%.

[0064] (3) The paving process plan for heavy-duty transportation roads in mines using soil stabilizers includes the following steps:

[0065] S1. According to the process parameters determined in step (2), calculate the actual amounts of raw materials such as the required soil spreading volume, cement, fully 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-naphthalenesulfonic acid sodium formaldehyde condensate, diethanol monoisopropanolamine, calcium chloride, and amino sulfonate superplasticizer, and prepare the materials for convenient paving.

[0066] S2. Excavate the roadbed, tidy up the site, set the center line and side lines on the roadbed, set a stake every 15 - 20 m, make marks on the stakes, conduct elevation measurement, mark the designed height of the road surface and the loose paving height of the mixture; then use a rotary tiller to till 2 times first to make the particle size in the mine soil < 5 mm, and pave according to a loose paving coefficient of 1.58. According to the water requirement of the section, use a water truck to cooperate with the calculation personnel to conduct the first water replenishment operation on the section, and replenish the water to 25%; after the rotary tiller stirs, use a grader to level it.

[0067] S3. Dry-mix the solid waste granular materials such as fully tailings machine-made sand, steel slag, white mud slag powder, and gypsum in proportion to obtain a dry-mixed mixture, spread the obtained dry-mixed mixture, and then conduct the second water replenishment during the stirring process of the rotary tiller, and further mix and stuff evenly.

[0068] S4. On the basis of step S3, spread polyacrylamide, β-naphthalenesulfonic acid sodium formaldehyde condensate, diethanol monoisopropanolamine, calcium chloride, amino sulfonate high molecular synthetic resin, and cement in proportion in sequence. After all spreading is completed, use a road mixer to stir evenly. The mixing should be carried out from both sides to the center and reach about 1 cm of the solidified bottom layer. Each mixing should have overlap and thorough turning, and there should be no missed mixing. Moreover, the color of the solidified soil during mixing should be kept consistent, and there should be no unmixed plain soil interlayer left between the base layer and the sub-base layer; if the water content of the solidified soil is too low, stir once more and add water once to make the water fully replenished into the solidified soil.

[0069] S5. After the mixtures in steps S3 and S4 are mixed evenly and spread, immediately conduct preliminary shaping with a straight wooden strip or iron bar. In the straight section, scrape from both sides to the center, and in the horizontal curve section, scrape from the inside to the outside.

[0070] S6. After shaping is completed, the heavy roller starts to work and compacts the soil into shape. First, it performs static compaction once, then the grader scrapes off the soil layer that has been compacted twice on the surface, vibratory compaction is carried out twice, the grader levels it once, and finally static compaction is carried out twice for finishing. The compaction degree is controlled to be greater than 95%. During the compaction process, when phenomena such as elastic soil, looseness, and peeling occur, treatment measures should be taken in a timely manner. If the moisture content is not well maintained and fish-scale patterns appear on some parts of the road surface during compaction, after compaction is completed, sprinkle water and let it stand still for 1 h, then perform static compaction for another layer, which will have a better effect;

[0071] S7. Repeat steps S1 - S6 to lay the subbase, base course, and surface course in sequence; after the surface course is treated well, build a drainage ditch with a width of 30 cm and a depth of 5 cm on the side of the solidified soil road to facilitate the drainage of road rainwater during rain and avoid damaging the road subgrade; then, cover it with materials such as straw curtains, wheat straw, and straw bags, and do not sprinkle water immediately. Start sprinkler maintenance 24 h later (depending on weather changes), and the maintenance period should not be less than 7 d. Sprinkle water 6 - 8 times a day to keep the surface moist. When sprinkling water, pay attention not to directly impact the road surface with water, and no heavy vehicles or heavy objects are allowed during the maintenance period.

[0072] The road surface structure of the transportation road finally built in this embodiment is as Figure 1 shown.

[0073] Comparative Example 1

[0074] Build a transportation road according to the method of the embodiment. The difference is that in step (2) of this comparative example, an equal amount of commercially available ordinary solidifying agent (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, 15 parts by weight of sodium silicate) is used to replace each soil solidifying agent in step (2) of the embodiment.

[0075] Comparative Example 2

[0076] Build a transportation road according to the method of the embodiment. The difference is that in step (2) of this comparative example, each soil solidifying agent does not contain polyacrylamide.

[0077] Comparative Example 3

[0078] Build a transportation road according to the method of the embodiment. The difference is that in step (2) of this comparative example, each soil solidifying agent does not contain β - naphthalene sulfonate formaldehyde condensate.

[0079] Comparative Example 4

[0080] Build a transportation road according to the method of the embodiment. The difference is that in step (2) of this comparative example, each soil solidifying agent does not contain diethanol monoisopropanolamine.

[0081] Comparative Example 5

[0082] Construct the transportation road according to the method of the embodiment, except that in step (2) of this comparative example, calcium chloride is not contained in each soil stabilizer involved.

[0083] Comparative Example 6

[0084] Construct the transportation road according to the method of the embodiment, except that in step (2) of this comparative example, high-range water reducer of aminosulfonate is not contained in each soil stabilizer involved.

[0085] Test Example

[0086] On the 7th day, 14th day, and 28th day respectively after the construction of each transportation road is completed, conduct on-site inspections, and take samples at intervals of a certain section for performance testing. The results are shown in Tables 2 to 6.

[0087] Table 2 Unconfined Compressive Strength Test Results

[0088]

[0089]

[0090] Table 3 Freeze-Thaw Test Results

[0091]

[0092] Table 4 Water Stability Test Results

[0093]

[0094] Table 5 Compressive Resilient Modulus Test Results

[0095]

[0096] Table 6 Flexural Tensile (Splitting) Strength Test Results

[0097]

[0098] It can be seen from Tables 2 to 6 that compared with the commercially available soil stabilizer, the soil stabilizer of the present invention can significantly improve the various performances of the mining area transportation road.

[0099] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A layered pavement structure, characterized in that, The layered pavement structure includes three cured material layers, which are, from top to bottom, the surface layer, the base layer, and the subbase layer; the cured material layer is formed by curing raw materials including soil and a soil curing agent; wherein, In the surface layer, the weight of the soil curing agent 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 curing agent is 8% - 10% of the weight of the soil; the thickness of the base layer is 28 - 33 cm; And / or, in the subbase layer, the weight of the soil curing agent is 6% - 8% of the weight of the soil; the thickness of the subbase layer is 20 - 25 cm; Calculated by weight percentage of the total weight of the soil curing agent, the soil curing agent includes the following components: 56% - 75% of solid waste granular material, 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 material includes 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 layered pavement structure according to claim 1, characterized in that, The particle size of the all-tailings manufactured sand is 0 - 4.5 mm.

3. The layered pavement structure according to claim 1, characterized in that, The particle size of the white mud slag powder is 180 - 300 μm.

4. The layered pavement structure according to claim 1, characterized in that, In the order from the surface layer to the subbase layer, in each of the cured layers, the content of the solid waste granular material in the soil curing agent gradually increases.

5. The construction method of the layered pavement structure according to claim 1, characterized in that, Including 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 curing agent; Based on the optimal ratio and the preset parameters of the layered pavement structure, determine the actual dosage of each component in the soil curing agent; Perform pretreatment on 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 material on the working surface, and after spreading, stir and replenish water to carry out 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 curing agent on the working surface, and after spreading, stir and mix evenly, shape, roll and form, and cure.

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