Modified aeolian sand road base material and preparation method thereof

Abstract

The invention discloses a modified aeolian sand road base material which is composed of the following components in parts by weight: 620-635 parts of aeolian sand; 1030 to 1055 parts of fine aggregate; 3510 to 3580 parts of coarse aggregate; 230 to 265 parts of modified aeolian sand powder; 50 to 80 parts of cement; 0.32 to 0.96 part of super absorbent resin; and 425 to 525 parts of water. The modified aeolian sand is aeolian sand compositely modified by metakaolin, ardealite and triethanolamine, a sodium silicate-polyvinyl acetate composite curing agent is adopted for curing, and the modified aeolian sand has the advantages of being small in granularity, high in specific surface area, high in reaction activity, good in viscosity and the like. After being added into a base material, the material can improve the mechanical property, the volume stability and the durability of the base material, is relatively low in cost and good in economic benefit, and has good application potential in a cementing material and a pavement material.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering materials, and particularly relates to a modified aeolian sand road base material. Background Art

[0002] The characteristics of highway construction in desert areas are the extreme lack of high-quality materials, inconvenient access, and long transportation distances, which greatly increase the construction cost. Reducing the energy consumption of highway construction in desert areas and using local materials are two important goals. The rational development of natural resources includes using aeolian sand instead of stone chips as fine aggregate to prepare the road base, effectively alleviating the imbalance between supply and demand of fine aggregate, and at the same time providing a reference for the sustainable development of road building materials. Therefore, using aeolian sand to replace conventional fine aggregate to prepare the road base is an inevitable trend in the development of engineering materials, which will surely bring significant economic and social benefits. Currently, existing research mainly focuses on the macroscopic physical properties of aeolian sand and its engineering applications in the fields of road and building construction as fine aggregate. Although it reveals the origin, composition, and engineering application value of aeolian sand to a certain extent, the research on the essential properties of silicon oxides contained in aeolian sand itself and the application of its potential cementitious properties is still blank; therefore, it is necessary to conduct systematic research and development on the cementitious properties of aeolian sand; the dosage of aeolian sand in the road base mixture is relatively small, not reaching a large enough content to support the resource utilization and large-scale utilization of aeolian sand, resulting in the potential economic and social benefits of aeolian sand not being truly explored and causing serious waste of resources; there is little research on the strength characteristics, mechanical properties, road performance, etc. of cement-stabilized graded crushed stone mixtures mixed with aeolian sand; in addition, in view of the extremely dry situation in desert areas, the subgrade materials need to have high strength to ensure load-bearing, low shrinkage to prevent pavement cracking, and maximize and rationalize the dosage of aeolian sand on the basis of meeting mechanical properties. The existing technology cannot meet the requirements and further research and development are needed. Summary of the Invention

[0003] Technical Problem to be Solved: The technical problem to be solved by the present invention is to provide a modified aeolian sand road base material.

[0004] Technical Solution: A modified aeolian sand road base material is composed of the following parts by weight: Aeolian sand: 620 - 635 parts; Fine aggregate: 1030 - 1055 parts; Coarse aggregate: 3510 - 3580 parts; Modified aeolian sand powder: 230 - 265 parts; Cement: 50 - 80 parts; High water-absorbing resin: 0.32 - 0.96 parts; Water: 425 - 525 parts. Preferably, the preparation method of the modified aeolian sand powder comprises the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 750 - 850 °C for calcination and insulation, then quickly raise the temperature to 1000 - 1100 °C and keep it warm, and finally cool to obtain calcined aeolian sand; S2. Mix the calcined aeolian sand, metakaolin, and phosphogypsum powder and put them into a ball mill, and add triethanolamine for grinding to obtain a composite powder; S3. Add sodium silicate and polyvinyl acetate to deionized water, and add an emulsifier for ultrasonic stirring to obtain a sodium silicate - polyvinyl acetate emulsion; S4. Uniformly spray the sodium silicate - polyvinyl acetate emulsion on the composite powder, and obtain the modified aeolian sand powder after consolidation. Preferably, the ratio of the aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine in step S2 is 75:22.5 - 23.5:1.5 - 2.5:0.02 - 0.04; the ratio of the polyvinyl acetate and sodium silicate in step S3 is 1:2 - 2.5. Preferably, the specific surface area of the metakaolin is 672 - 678 m 2 / kg, and the contents of SiO 2 , Al 2 O 3 , Fe 2 O 3 , CaO, and MgO are 52 - 53%, 41 - 42%, 3.0 - 3.5%, 0.25 - 0.35%, and 0.15 - 0.25% respectively, and the activity coefficient is 0.21 - 0.38; preferably, the specific surface area of the modified aeolian sand powder is 300 - 350 m 2 / kg, and the particle size distribution is 1 - 100 μm. Preferably, the particle size range of the aeolian sand is 0.075 - 0.3 mm, the coefficient of uniformity is 2.1 - 2.15, the coefficient of curvature is 2.1 - 2.15, the fineness modulus is 0.25 - 0.3, the apparent density is 2.6 - 2.7 g / cm 3 , the mud content is 9.0 - 9.2%, and the water absorption rate is 0.47% - 0.72%. Preferably, the particle size range of the fine aggregate is 2.36 - 4.75 mm, its apparent density is 2.6 - 2.7 g / cm 3 , the crushing value is 19 - 19.5%, the content of needle - like and flaky particles is 14 - 14.5%, and the water absorption rate is 0.75 - 0.8%. Preferably, the particle size ranges of the coarse aggregate are 4.75 - 9.5 mm and 9.5 - 26.5 mm; among them, the apparent density of the 4.75 - 9.5 mm crushed stone is 2.7 - 2.8 g / cm 3, crushing value 17.5 - 18%, flaky and elongated particle content 13 - 14%, water absorption rate 0.75 - 0.8%; apparent density of 9.5 - 26.5 mm crushed stone is 2.6 - 2.7 g / cm 3 , crushing value 19.5 - 20.5%, flaky and elongated particle content 11.5 - 12.5%, water absorption rate 0.2 - 0.25%. Preferably, the cement is P·O 42.5 ordinary Portland cement, with a specific surface area of 3.6 - 3.7 m 2 / kg, initial setting time and final setting time are 200 - 210 min and 250 - 260 min respectively, 3d and 28d compressive and flexural strengths are 30 - 31 MPa and 50 - 51 MPa respectively, loss on ignition 3.8 - 4.0%; the mixing water required is tap water. Preferably, the superabsorbent resin includes any one or more of ionic superabsorbent resin, non - ionic superabsorbent resin and composite superabsorbent resin; the additional water absorption amount of the superabsorbent resin (superabsorbent resin dosage × water absorption ratio) is 10 - 30 times, and the particle size range is 80 - 100 mesh. Preferably, the preparation method of the modified aeolian sand road base material includes the following steps: S11. Mix aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm and mix them evenly according to the proportion, cover with plastic wrap and stuff for 5 - 7 h to fully wet the surface to obtain a wetted mixture; S12. Mix the superabsorbent resin, cement and modified aeolian sand powder evenly according to the proportion to obtain a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly, cure after static pressing to obtain the modified aeolian sand road base material. Beneficial effects: Compared with the prior art, the present invention has the following characteristics: The modified aeolian sand powder in the modified aeolian sand road base material of the present invention is prepared by high - temperature calcination + mechanical grinding, and has the characteristics of large specific surface area and strong reaction activity, which can improve the mechanical properties and shrinkage resistance of the base mixture. Aeolian sand has a loose structure, no cohesion between particles, poor water retention, and poor engineering properties. It is not suitable to be directly used as the filler for the subgrade bed bottom of the aeolian sand embankment. Therefore, it needs to be modified: grind the aeolian sand after high - temperature calcination, and add metakaolin, phosphogypsum and triethanolamine. The untreated aeolian sand has a high degree of crystallization and low activity. Heat treatment methods such as high - temperature calcination are used to remove the free water in its particles, so as to transform the stable silicon - aluminum structure into a metastable structure to improve the reaction activity of silicon - aluminum in aeolian sand. Grinding reduces the particle size of aeolian sand particles, increases the density and specific surface area, and at the same time destroys part of the SiO on the surface of aeolian sand particles 2The crystal structure changes the bond energy between crystals, generating vacancies and defects, which helps break chemical bonds, thereby reducing the reaction activation energy and making it easier to undergo a secondary hydration reaction with cement hydration products, enhancing its pozzolanic activity. Metakaolin is a typical aluminous pozzolanic material with high pozzolanic activity, and its main components are Al 2 O 3 and SiO 2 . The main component of phosphogypsum is calcium sulfate dihydrate, and the combined action of Ca 2+ and SO 4 2- can react with the active Al 2 O 3 in aeolian sand and metakaolin to produce ettringite (3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O). Phosphogypsum and triethanolamine together as a composite activator can stimulate the latent activity in aeolian sand; SO 4 2- can also displace SiO 4 2- , and SiO 4 2- reacts with Ca 2+ to form C-S-H gel, improving the mechanical properties and durability of cement-based materials; and aeolian sand has a relatively large shrinkage under the action of the activator, while SO 3 in phosphogypsum can act as an expansion source to inhibit shrinkage. In addition, triethanolamine undergoes a chemical reaction with the surface of aeolian sand particles to form a dense protective film, preventing the adhesion between particles, thereby reducing the friction between aeolian sand particles and improving the grinding efficiency. It can also act as a dispersant to evenly disperse aeolian sand particles and reduce the agglomeration phenomenon. Using chemical methods to chemically cure the ground modified aeolian sand, the use of organic-inorganic composite curing materials can make the organic materials and inorganic materials form complementary advantages, achieving a better curing effect, and further improving the mechanical properties, stability and durability of the materials. In the base material, replacing part of the cementitious material with modified aeolian sand powder can also reduce the energy consumption during cement production, lower carbon emissions, and be environmentally friendly. Adding unmodified aeolian sand particles to adjust the proportion of natural sand can improve the particle gradation of fine aggregates, making the aeolian sand graded crushed stone base more dense, reducing the production cost of the base material, and playing a positive role in the sustainable development of mineral resources and desert control. Due to its excellent water absorption - water retention - water release performance, the superabsorbent resin polymer can introduce moisture, compensate for humidity, promote the hydration degree of modified aeolian sand, and regulate the internal pore system of the mixture in the aeolian sand base mixture, enhancing the anti - shrinkage and cracking performance of the aeolian sand base mixture, ensuring the safe operation of vehicles, and extending the service life of the highway. Compared with the prior art, the present invention has the following advantages and positive effects: The present invention uses metakaolin, phosphogypsum, and triethanolamine to modify aeolian sand, which has small particle size, large specific surface area, strong reaction activity, and good viscosity, and can be used as an excellent cementitious material. The present invention uses sodium silicate - polyvinyl acetate composite curing agent to cure the modified aeolian sand, with the complementary advantages of organic and inorganic materials, increasing the water retention and adhesiveness of aeolian sand. The present invention adds superabsorbent resin, which can play the role of water absorption and water retention, improving the volume stability of the material. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is the particle size distribution diagram of modified aeolian sand. DETAILED DESCRIPTION OF THE INVENTION To further understand the present invention, the preferred embodiments of the present invention will be described below in conjunction with examples. The specific preferred examples are as follows: Example 1: A modified aeolian sand road base material is composed of the following parts by weight: Aeolian sand: 620.3 parts; Fine aggregate: 1033.7 parts; Coarse aggregate: 3515.1 parts; Modified aeolian sand powder: 232.6 parts; Cement: 77.6 parts; Superabsorbent resin: 0.32 parts; Water: 520.5 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water intake is 3.2 parts; The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and insulation, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool to obtain calcined aeolian sand; S2. Mix the calcined aeolian sand, metakaolin, and phosphogypsum powder, put them into a ball mill, and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine is 75:23:2:0.03 to obtain a composite powder. S3. Add sodium silicate and polyvinyl acetate to deionized water. The ratio of polyvinyl acetate to sodium silicate is 1:2.2, and add an emulsifier and stir ultrasonically to obtain a sodium silicate - polyvinyl acetate emulsion. S4. Evenly spray the sodium silicate - polyvinyl acetate emulsion onto the composite powder, and after consolidation, obtain the modified aeolian sand powder. The preparation method of the modified aeolian sand road base material includes the following steps: S11. Mix aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm in proportion and stir evenly. Cover with plastic wrap and let stand for 6 h to fully wet the surface to obtain a wetted mixture. S12. Mix the superabsorbent resin, cement, and modified aeolian sand powder in proportion and stir evenly to obtain a mixture. S13. Mix the mixtures obtained in S11 and S12 and stir evenly, then cure after static pressing to obtain the modified aeolian sand road base material. Example 2: A modified aeolian sand road base material consists of the following parts by weight: Aeolian sand: 626 parts; Fine aggregate: 1043.4 parts; Coarse aggregate: 3547.6 parts; Modified aeolian sand powder: 234.8 parts; Cement: 78.3 parts; Superabsorbent resin: 0.64 part; Water: 470 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water absorption is 12.8 parts. The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and insulation, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool to obtain the calcined aeolian sand. S2. Mix the calcined aeolian sand, metakaolin, and phosphogypsum powder, put them into a ball mill, and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine is 75:23:2:0.03 to obtain a composite powder. S3. Add sodium silicate and polyvinyl acetate into deionized water. The ratio of polyvinyl acetate to sodium silicate is 1:2.2. Add an emulsifier and stir ultrasonically to obtain a sodium silicate - polyvinyl acetate emulsion; S4. Uniformly spray the sodium silicate - polyvinyl acetate emulsion onto the composite powder. After consolidation, obtain the modified aeolian sand powder; The preparation method of the modified aeolian sand road base material includes the following steps: S11. Mix aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm in proportion and stir evenly. Cover with plastic wrap and let stand for 6 h to fully wet the surface to obtain a wetted mixture; S12. Mix the superabsorbent resin, cement and modified aeolian sand powder in proportion and stir evenly to obtain a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly. After static pressing, cure to obtain the modified aeolian sand road base material. Example 3: A modified aeolian sand road base material consists of the following parts by weight: Aeolian sand: 630.7 parts; Fine aggregate: 1051.1 parts; Coarse aggregate: 3573.9 parts; Modified aeolian sand powder: 236.5 parts; Cement: 78.8 parts; Superabsorbent resin: 0.96 parts; Water: 429 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water absorption is 28.8 parts; The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and insulation, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool to obtain calcined aeolian sand; S2. Put the calcined aeolian sand, metakaolin and phosphogypsum powder into a ball mill, and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder and triethanolamine is 75:23:2:0.03 to obtain a composite powder; S3. Add sodium silicate and polyvinyl acetate into deionized water. The ratio of polyvinyl acetate to sodium silicate is 1:2.2. Add an emulsifier and stir ultrasonically to obtain a sodium silicate - polyvinyl acetate emulsion; S4. Uniformly spray the sodium silicate - polyvinyl acetate emulsion onto the composite powder. After consolidation, obtain the modified aeolian sand powder; The preparation method of the modified aeolian sand road base material comprises the following steps: S11. Mix aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm and in proportion, stir evenly, cover with plastic wrap and keep the material moist for 6 h to fully wet the surface, and obtain a wetted mixture; S12. Mix superabsorbent resin, cement and modified aeolian sand powder in proportion and stir evenly to obtain a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly, cure after static pressing to obtain the modified aeolian sand road base material. Example 4: A modified aeolian sand road base material consists of the following parts by weight: Aeolian sand: 622.6 parts; Fine aggregate: 1037.6 parts; Coarse aggregate: 3528 parts; Modified aeolian sand powder: 249 parts; Cement: 62.3 parts; Superabsorbent resin: 0.62 part; Water: 429 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water absorption is 18.6 parts; The preparation method of the modified aeolian sand powder comprises the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and insulation, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool to obtain calcined aeolian sand; S2. Put the calcined aeolian sand, metakaolin and phosphogypsum powder into a ball mill, add triethanolamine and grind. The ratio of aeolian sand, metakaolin, phosphogypsum powder and triethanolamine is 75:23:2:0.03 to obtain a composite powder; S3. Add sodium silicate and polyvinyl acetate to deionized water. The ratio of polyvinyl acetate to sodium silicate is 1:2.2, and add an emulsifier and stir ultrasonically to obtain a sodium silicate - polyvinyl acetate emulsion; S4. Evenly spray the sodium silicate - polyvinyl acetate emulsion on the composite powder, and obtain the modified aeolian sand powder after consolidation; The preparation method of the modified aeolian sand road base material comprises the following steps: S11. Mix aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm and in proportion, stir evenly, cover with plastic wrap and keep the material moist for 6 h to fully wet the surface, and obtain a wetted mixture; S12. Mix the superabsorbent resin, cement, and modified aeolian sand powder in proportion and stir evenly to obtain a mixture. S13. Mix the mixtures obtained in S11 and S12 and stir evenly. After static pressing, cure to obtain the modified aeolian sand road base material. Example 5: A modified aeolian sand road base material consists of the following parts by weight: Aeolian sand: 627.2 parts; Fine aggregate: 1045.3 parts; Coarse aggregate: 3554 parts; Modified aeolian sand powder: 251 parts; Cement: 62.7 parts; Superabsorbent resin: 0.96 part; Water: 459.8 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water absorption is 9.5 parts. The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and insulation, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool to obtain calcined aeolian sand. S2. Put the calcined aeolian sand, metakaolin, and phosphogypsum powder into a ball mill, add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine is 75:23:2:0.03 to obtain a composite powder. S3. Add sodium silicate and polyvinyl acetate to deionized water. The ratio of polyvinyl acetate to sodium silicate is 1:2.2, and add an emulsifier for ultrasonic stirring to obtain a sodium silicate - polyvinyl acetate emulsion. S4. Evenly spray the sodium silicate - polyvinyl acetate emulsion on the composite powder, and obtain the modified aeolian sand powder after consolidation. The preparation method of the modified aeolian sand road base material includes the following steps: S11. Mix the aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate of 2.36 - 4.75 mm, and coarse aggregate of 4.75 - 26.5 mm in proportion and stir evenly. Cover with plastic wrap and keep the material for 6 h to fully wet the surface to obtain a wetted mixture. S12. Mix the superabsorbent resin, cement, and modified aeolian sand powder in proportion and stir evenly to obtain a mixture. S13. Mix the mixtures obtained in S11 and S12 and stir evenly. After static pressing, cure to obtain the modified aeolian sand road base material. Example 6: A modified aeolian sand road base material consists of the following parts by weight: Aeolian sand: 624.9 parts; Fine aggregate: 1041.5 parts; Coarse aggregate: 3541.1 parts; Modified aeolian sand powder: 250 parts; Cement: 62.5 parts; Superabsorbent resin: 0.32 part; Water: 480 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water intake is 6.4 parts; The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and insulation, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool to obtain calcined aeolian sand; S2. Mix the calcined aeolian sand, metakaolin, and phosphogypsum powder and put them into a ball mill, and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine is 75:23:2:0.03 to obtain a composite powder; S3. Add sodium silicate and polyvinyl acetate to deionized water. The ratio of polyvinyl acetate to sodium silicate is 1:2.2, and add an emulsifier for ultrasonic stirring to obtain a sodium silicate-polyvinyl acetate emulsion; S4. Uniformly spray the sodium silicate-polyvinyl acetate emulsion on the composite powder, and obtain the modified aeolian sand powder after consolidation; The preparation method of the modified aeolian sand road base material includes the following steps: S11. Mix the aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate of 2.36 - 4.75 mm, coarse aggregate of 4.75 - 26.5 mm in proportion and stir evenly, cover with plastic wrap and stuff for 6 h to fully wet the surface to obtain a wetted mixture; S12. Mix the superabsorbent resin, cement, and modified aeolian sand powder in proportion and stir evenly to obtain a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly, and cure after static pressing to obtain the modified aeolian sand road base material. Example 7: A modified aeolian sand road base material, which consists of the following parts by weight: Aeolian sand: 620.3 parts; Fine aggregate: 1033.9 parts; Coarse aggregate: 3515.1 parts; Modified aeolian sand powder: 258.5 parts; Cement: 51.7 parts; Superabsorbent resin: 0.96 part; Water: 520.5 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water absorption is 19.2 parts; The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and keep it warm, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool to obtain calcined aeolian sand; S2. Put the calcined aeolian sand, metakaolin, and phosphogypsum powder into a ball mill, and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine is 75:23:2:0.03 to obtain a composite powder; S3. Add sodium silicate and polyvinyl acetate to deionized water. The ratio of polyvinyl acetate to sodium silicate is 1:2.2, and add an emulsifier for ultrasonic stirring to obtain a sodium silicate-polyvinyl acetate emulsion; S4. Uniformly spray the sodium silicate-polyvinyl acetate emulsion on the composite powder, and obtain the modified aeolian sand powder after consolidation; The preparation method of the modified aeolian sand road base material includes the following steps: S11. Mix the aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm in proportion and stir evenly, cover it with plastic wrap and keep it stuffy for 6 h to fully infiltrate the surface to obtain an infiltrated mixture; S12. Mix the superabsorbent resin, cement, and modified aeolian sand powder in proportion and stir evenly to obtain a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly, cure after static pressing to obtain the modified aeolian sand road base material. Example 8: A modified aeolian sand road base material is composed of the following parts by weight: Aeolian sand: 622 parts; Fine aggregate: 1036.7 parts; Coarse aggregate: 3524.8 parts; Modified aeolian sand powder: 259.2 parts; Cement: 51.8 parts; Superabsorbent resin: 0.32 part; Water: 505.5 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water absorption is 9.6 parts; The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and keep it warm, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool to obtain calcined aeolian sand; S2. Mix the calcined aeolian sand, metakaolin, and phosphogypsum powder, put them into a ball mill, and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine is 75:23:2:0.03 to obtain a composite powder. S3. Add sodium silicate and polyvinyl acetate to deionized water. The ratio of polyvinyl acetate to sodium silicate is 1:2.2, and add an emulsifier for ultrasonic stirring to obtain a sodium silicate-polyvinyl acetate emulsion. S4. Spray the sodium silicate-polyvinyl acetate emulsion evenly on the composite powder, and obtain the modified aeolian sand powder after consolidation. The preparation method of the modified aeolian sand road base material includes the following steps: S11. Mix the aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm in proportion and stir evenly. Cover with plastic wrap and let it stand for 6 h to fully wet the surface to obtain a wetted mixture. S12. Mix the superabsorbent resin, cement, and modified aeolian sand powder in proportion and stir evenly to obtain a mixture. S13. Mix the mixtures obtained in S11 and S12 and stir evenly, then cure after static pressing to obtain the modified aeolian sand road base material. Example 9: A modified aeolian sand road base material consists of the following parts by weight: Aeolian sand: 628.3 parts; Fine aggregate: 1047.2 parts; Coarse aggregate: 3560.6 parts; Modified aeolian sand powder: 261.8 parts; Cement: 52.4 parts; Superabsorbent resin: 0.64 part; Water: 449.6 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water absorption is 6.4 parts; The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and insulation, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool to obtain the calcined aeolian sand. S2. Mix the calcined aeolian sand, metakaolin, and phosphogypsum powder, put them into a ball mill, and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine is 75:23:2:0.03 to obtain a composite powder. S3. Add sodium silicate and polyvinyl acetate into deionized water. The ratio of polyvinyl acetate to sodium silicate is 1:2.2. Add an emulsifier and stir ultrasonically to obtain a sodium silicate-polyvinyl acetate emulsion; S4. Evenly spray the sodium silicate-polyvinyl acetate emulsion onto the composite powder, and obtain the modified aeolian sand powder after consolidation; The preparation method of the modified aeolian sand road base material includes the following steps: S11. Mix aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm and mix them evenly according to the ratio. Cover with plastic wrap and keep the material moist for 6 h to fully wet the surface, and obtain a wetted mixture; S12. Mix the superabsorbent resin, cement and modified aeolian sand powder evenly according to the ratio to obtain a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly, then cure after static pressing to obtain the modified aeolian sand road base material. To further illustrate the technical effects of the present invention, the present invention also sets a comparative example, which is specifically as follows: Comparative Example 1: A base material is composed of the following parts by weight: Aeolian sand: 625.3 parts; Fine aggregate: 1050.8 parts; Coarse aggregate: 3566 parts; Metakaolin: 216.6 parts; Cement: 72.2 parts; Water: 452.3 parts; The preparation method of the base material includes the following steps: S11. Mix aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm and mix them evenly according to the ratio. Cover with plastic wrap and keep the material moist for 6 h to fully wet the surface, and obtain a wetted mixture; S12. Mix the cement and metakaolin evenly according to the ratio to obtain a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly, then cure after static pressing to obtain the base material. Comparative Example 2: A base material is composed of the following parts by weight: Aeolian sand: 630.2 parts; Fine aggregate: 1044.9 parts; Coarse aggregate: 3534 parts; Metakaolin: 244.4 parts; Cement: 61.1 parts; Water: 478.2 parts; The preparation method of the base material comprises the following steps: S11. Mix aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm in proportion and stir evenly. Cover with plastic wrap and keep the material moist for 6 h to fully wet the surface, obtaining a wetted mixture; S12. Mix cement and metakaolin in proportion and stir evenly, obtaining a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly. After static pressing, cure to obtain the base material. Comparative Example 3: A base material consists of the following parts by weight: Aeolian sand: 621.7 parts; Fine aggregate: 1044.5 parts; Coarse aggregate: 3524 parts; Metakaolin: 256 parts; Cement: 51.2 parts; Water: 433.5 parts; The preparation method of the base material comprises the following steps: S11. Mix aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm in proportion and stir evenly. Cover with plastic wrap and keep the material moist for 6 h to fully wet the surface, obtaining a wetted mixture; S12. Mix cement and metakaolin in proportion and stir evenly, obtaining a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly. After static pressing, cure to obtain the base material. Comparative Example 4: A base material consists of the following parts by weight: Aeolian sand: 632.8 parts; Fine aggregate: 1043.1 parts; Coarse aggregate: 3535 parts; Modified aeolian sand powder: 226.8 parts; Cement: 75.6 parts; Superabsorbent resin: 0.64 part; Water: 447 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water intake is 12.8 parts; The preparation method of the modified aeolian sand powder comprises the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and insulation, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool it to obtain calcined aeolian sand; S2. Put the calcined aeolian sand, metakaolin, and phosphogypsum powder into a ball mill and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine is 75:23:2:0.03 to obtain modified aeolian sand powder; The preparation method of the base material includes the following steps: S11. Mix the aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm in proportion and stir evenly. Cover it with plastic wrap and keep it stuffy for 6 h to fully infiltrate the surface to obtain an infiltrated mixture; S12. Mix the superabsorbent resin, cement, and modified aeolian sand powder in proportion and stir evenly to obtain a mixture; S13. Mix the mixtures obtained in S11 and S12 and stir evenly, then cure it under static pressure to obtain the base material. Comparative Example 5: A base material consists of the following parts by weight: Aeolian sand: 625.5 parts; Fine aggregate: 1037.5 parts; Coarse aggregate: 3562 parts; Modified aeolian sand powder: 229.8 parts; Cement: 76.6 parts; Superabsorbent resin: 0.64 part; Water: 439 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water absorption is 12.8 parts; The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and insulation, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool it to obtain calcined aeolian sand; S2. Put the calcined aeolian sand, metakaolin, and phosphogypsum powder into a ball mill and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder, and triethanolamine is 75:23:2:0.03 to obtain a composite powder; S3. Add sodium silicate to deionized water and stir ultrasonically to obtain a water glass solution; S4. Spray the water glass solution evenly on the composite powder until it is consolidated to obtain the modified aeolian sand powder; The preparation method of the base material includes the following steps: S11. Mix the aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm and mix them evenly in proportion. Cover them with plastic wrap and let them stand for 6 h to fully wet the surface, obtaining a wet-mixed material; S12. Mix the superabsorbent resin, cement and modified aeolian sand powder evenly in proportion to obtain a mixed material; S13. Mix the mixed materials obtained in S11 and S12 evenly, compact them statically and cure them to obtain the base course material. Comparative Example 6: A base course material consists of the following parts by weight: Aeolian sand: 627.3 parts; Fine aggregate: 1045.3 parts; Coarse aggregate: 3524 parts; Modified aeolian sand powder: 231.2 parts; Cement: 77.1 parts; Superabsorbent resin: 0.64 part; Water: 443 parts; The superabsorbent resin is a composite superabsorbent resin, and the additional water absorption is 12.8 parts; The preparation method of the modified aeolian sand powder includes the following steps: S1. Heat and dry the aeolian sand, raise the temperature to 800 °C for calcination and keep it warm, then quickly raise the temperature to 1050 °C and keep it warm, and finally cool it to obtain calcined aeolian sand; S2. Put the calcined aeolian sand, metakaolin and phosphogypsum powder into a ball mill, and add triethanolamine for grinding. The ratio of aeolian sand, metakaolin, phosphogypsum powder and triethanolamine is 75:23:2:0.03 to obtain a composite powder; S3. Add polyvinyl acetate to deionized water, and add an emulsifier for ultrasonic stirring to obtain a polyvinyl acetate emulsion; S4. Spray the polyvinyl acetate emulsion evenly on the composite powder until it solidifies to obtain the modified aeolian sand powder; The preparation method of the base course material includes the following steps: S11. Mix the aeolian sand with a particle size of 0.01 - 2.36 mm, fine aggregate with a particle size of 2.36 - 4.75 mm, coarse aggregate with a particle size of 4.75 - 26.5 mm and mix them evenly in proportion. Cover them with plastic wrap and let them stand for 6 h to fully wet the surface, obtaining a wet-mixed material; S12. Mix the superabsorbent resin, cement and modified aeolian sand powder evenly in proportion to obtain a mixed material; S13. Mix the mixed materials obtained in S11 and S12 evenly, compact them statically and cure them to obtain the base course material. The compaction test was carried out on the modified aeolian sand road base materials prepared in Examples 1-9. The specific method is as follows: The compaction test of the modified aeolian sand road base materials was carried out according to the method in the "Test Regulations for Inorganic Binding Material Stabilized Materials in Highway Engineering" (JTG 3441-2024), and the water content-dry density relationship curve of the modified aeolian sand road base materials was drawn to determine the optimum water content and the maximum dry density of the modified aeolian sand road base materials. It was proposed that the dosage of the cementitious material (cement + modified aeolian sand powder) was 6%. The water addition amounts in Examples 1-9 were 8.4-10.4%, 6.5-10%, 5.7-9.7%, 7.6-10.6%, 7.8-9.5%, 6.3-9.8%, 8.6-10.4%, 7.9-9.9%, and 6.2-10.5% respectively. The parameters of the compaction test equipment (referring to Method C of T0804-1) were as follows: mass of the hammer: 4.5 kg; diameter of the hammer striking surface: 50 mm; drop height of the hammer: 450 mm; size of the compaction cylinder: inner diameter 152 mm, height 170 mm, volume 2177 mL; number of hammering layers: 3 layers; number of hammering times per layer: 98 times; average unit compaction work: 2.677 J, allowing the nominal maximum particle size of 37.5 mm. Take 2000 g of representative samples one day before the test to determine the natural moisture content of the aggregate. On the day of the test, take out about 30 kg of the sieved aggregate by the quartering method, then divide it into 5 equal parts on average, calculate the water addition amount of the mixture according to the 5 predetermined different moisture contents. The water addition amount is calculated according to Equation (T0804-1), and then it is evenly sprayed on the surface of the aggregate with a sprayer and mixed evenly, and sealed in a plastic bag and left to stand for 6 h. In the formula: m w - The water addition amount in the mixture (g); m n - The mass of the aggregate in the mixture (g), and its original moisture content is w n , that is, the air-dried moisture content (%); m c - The mass of the cementitious material in the mixture (g), and its original moisture content w c ; w - The moisture content required for the mixture (%). Add the required gelling materials to the wetted mixture and thoroughly mix them to a uniform state using a small spatula, trowel, or other tools. The gelling materials should be added one by one before compacting the specimens. After mixing the specimens with cement, the compaction test should be completed within 1 hour. Take 1 / 3 of the mixture using the quartering method and add it to the test bucket. Level the surface and slightly tamp it. Set the number of hammer blows per layer to 98 and conduct the compaction of the first layer. After completing the compaction of the first layer, "roughen" the surface of the compacted layer. Repeat the above steps to conduct the compaction of the remaining two layers of specimens. After completion of compaction, push out the specimens in the bucket using a demolding device and take two representative specimens from the inside of the specimens from top to bottom and place them in an oven at 110°C to determine their moisture content. The calculation formulas for moisture content and dry density are as follows: In the formula: ρ w - Wet density of the stabilized material (g / cm 3 ); m 1 - Total weight of the test bucket and the specimen (g); m 2 - Mass of the test bucket (g); V - Volume of the test bucket (cm 3 ). In the formula: ρ d - Dry density of the specimen (g / cm 3 ); w - Moisture content of the specimen. As can be seen from Table 1, there is an optimum moisture content for each group of mixtures. When the mixture reaches the optimum moisture content, the water film wrapped on the surface of the aggregate particles plays a lubricating role, the frictional resistance between the particles is the smallest, the wetting degree of the aggregate surface is more uniform, and the mixture can reach the maximum compaction degree. The optimum moisture content and the maximum dry density of the mixture increase with the increase in the dosage of modified aeolian sand powder. This is because the modified aeolian sand powder has characteristics such as a large surface area and a low density, and during the mixing and compaction processes, the aggregates inside the mixture tend to be arranged densely under the ball effect of the modified aeolian sand powder. When superabsorbent resin is incorporated, the optimum moisture content and the maximum dry density increase, which is related to the water absorption - desorption behavior of SAP itself. With the increase in the dosage of SAP, the optimum moisture content and the maximum dry density of each group decrease, which is related to the water absorption characteristics of SAP. With the increase in the additional water content, the optimum moisture content and the maximum dry density of each group show a trend of first increasing and then decreasing. This is because when the additional water content is greater than the water absorption capacity of SAP in the mixture, it will cause an increase in the mixing water in the entire mixture system, resulting in a decrease in the optimum moisture content and the maximum dry density. 1. Unconfined compressive strength: Conduct a compressive test on the prepared modified aeolian sand road base material according to the method in the "Test Regulations for Inorganic Binding Material Stabilized Materials for Highway Engineering" (JTG 3441 - 2024). Where: Rc-unconfined compressive strength of the specimen (MPa); P-maximum pressure when the specimen is destroyed (N); A-cross-sectional area of ​​the specimen (mm 2 ); A = ΠD 2 / 4; D-diameter of the specimen (mm). The same cementitious material content was set at 6%, and the compressive strength of the modified aeolian sand road base material was compared. The experimental results are shown in Table 1. It can be seen from the test results in Table 1 that the modified aeolian sand road base material prepared by the method of the present invention can meet the compressive strength requirements of the secondary and lower road bases after curing for 7 days. Referring to the "Technical Specifications for Highway Pavement Base Construction" (JTG / T F20-2015), under the same test conditions, the compressive performance of the modified aeolian sand road base material is better than that of the cement metakaolin stabilized aeolian sand gravel. Shrinkage performance: The test uses a shrinkage box that can measure temperature and humidity changes. The facility parameters are that the temperature in the box is controlled at 20±0.5℃ and the relative humidity is 60±5%. After curing, the surface moisture of the test piece is wiped off and its initial mass is weighed. The mass m is calculated from the time of being moved into the shrinkage box. The mass m is weighed at 2h, 6h, 12h, 24h, 48h, 72h, 96h, 120h, 144h, and 168h after the start of the test. i , and collect the shrinkage displacement deformation δ i After the shrinkage is complete, place the standard specimen in an oven and dry it to a constant weight m p . Water loss rate: ω i =(m i -m i+1 ) / m p Drying shrinkage strain: ε i =δ i / l Shrinkage coefficient: α di =ε i / ω i Total shrinkage coefficient: Where: w i -i-th water loss rate (%); δ i -i-th shrinkage displacement deformation (mm); ε i -i-th shrinkage strain (με); α di -i-th shrinkage coefficient (με / %); m i - the mass of the i-th standard specimen weighed (g); l- the length of the standard specimen (mm); m p - Constant weight of standard specimen after drying (g). Table 1 Experimental results of various embodiments and comparative examples It can be seen from Table 1 that the modified aeolian sand road base material has stronger anti-dry shrinkage property than the cement-metakaolin stabilized aeolian sand gravel base. According to the "Technical Rules for Construction of Highway Pavement Base" (JTGT F20-2015), the 7-day unconfined compressive strength of highways at or below the secondary level should be greater than 2.5 MPa. From the results of the above examples, it can be seen that each group meets the specification requirements, indicating that the modified aeolian sand road base material provided by the present invention can effectively release the potential activity of aeolian sand and improve the utilization rate of aeolian sand. The 7-day unconfined compressive strength value in Example 5 reaches the maximum, which is 133.1% higher than that of the surface of the unsprayed sodium silicate-polyvinyl acetate emulsion modified aeolian sand powder in Comparative Example 4. This is because after the aeolian sand is ground, the active components such as silica and reactive alumina on the surface increase. Spraying sodium silicate-polyvinyl acetate emulsion destroys the surface structure of aeolian sand (covalent bonds such as Si-O-Si, Al-O-Al, Si-O-Al, etc.), making Ca 2+ 、Al 3+ 、Si 4+ and other active substances dissolve out, and a polycondensation reaction occurs, polymerizing to form reaction products such as calcium silicate hydrate, calcium aluminate hydrate or calcium sulfoaluminate hydrate; in addition, the calcined aeolian sand, metakaolin, phosphogypsum powder, triethanolamine, etc. produce a synergistic strengthening effect, which not only improves the grinding efficiency of the calcined aeolian sand, but also has the effects of promoting hydration, enhancing volume stability, nucleation effect and filling effect. The 7-day unconfined compressive strength in Example 2 is 115.4% higher than that in Comparative Example 3 without the modified aeolian sand powder; in addition, the average dry shrinkage coefficient at 27 days in Example 6 is 74.1% less than that in Comparative Example 1 without the modified aeolian sand powder and superabsorbent resin. This is because there is sulfur trioxide in the phosphogypsum, which produces an appropriate volume expansion to resist shrinkage. In addition, the water released by the superabsorbent resin can adjust the relative humidity inside the mixture, effectively alleviating the dry shrinkage phenomenon in the aeolian sand base. Based on the above research results, the modified aeolian sand road base material prepared by the present invention not only has excellent mechanical properties, but also can effectively inhibit shrinkage cracking in the base, extend the service life of the road surface, reduce maintenance costs, has good economic benefits, and has broad development prospects.

Claims

1. A modified aeolian sand road base material, characterized in that: The modified aeolian sand road base material is composed of the following parts by weight: Aeolian sand: 620-635 parts; Fine aggregate: 1030-1055 parts; Coarse aggregate: 3510-3580 parts; Modified aeolian sand powder: 230-265 parts; Cement: 50-80 parts; Super absorbent resin: 0.32-0.96 parts; Water: 425-525 parts.

2. The modified aeolian sand road base material according to claim 1, characterized in that: The preparation method of the modified aeolian sand powder comprises the following steps: S1. The aeolian sand is heated and dried, and the temperature is raised to 750-850°C for calcination and heat preservation, and then the temperature is quickly raised to 1000-1100°C and heat preservation, and finally cooled to obtain calcined aeolian sand; S2. The calcined aeolian sand, metakaolin, phosphogypsum powder was mixed into a ball mill and ground with triethanolamine to obtain a composite powder; S3. Sodium silicate and polyvinyl acetate were added to deionized water, and an emulsifier was added with ultrasonic stirring to obtain a water glass - polyvinyl acetate emulsion; S4. Evenly spray the water glass-polyvinyl acetate emulsion on the composite powder until it solidifies to obtain modified aeolian sand powder.

3. The modified aeolian sand road base material according to claim 2, characterized in that: The ratio of aeolian sand, metakaolin, phosphogypsum powder and triethanolamine in step S2 is 75: 22.5~23.5:1.5~2.5:0.02~0.04; the ratio of polyvinyl acetate and sodium silicate in step S3 is 1:2~2.

5.

4. The modified aeolian sand road base material according to claim 1, characterized in that: The modified aeolian sand powder has a specific surface area of ​​300 to 350 m 2 / kg, and the particle size distribution is 1 to 100 μm.

5. The modified aeolian sand road base material according to claim 1, characterized in that: The particle size of the aeolian sand is 0.075-0.3 mm, and the apparent density is 2.6-2.7 g / cm 3 The mud content is 9.0~9.2%, and the water absorption rate is 0.47%~0.72%.

6. The modified aeolian sand road base material according to claim 1, characterized in that: The particle size of the fine aggregate is between 2.36 and 4.75 mm, and its apparent density is between 2.6 and 2.7 g / cm 3 , crushing value 19-19.5%, needle-like content 14-14.5%, water absorption 0.75-0.8%.

7. The modified aeolian sand road base material according to claim 1, characterized in that: The particle size range of the coarse aggregate is 4.75-9.5 mm and 9.5-26.5 mm; the apparent density of 4.75-9.5 mm crushed stone is 2.7-2.8 g / cm 3 , crushing value 17.5-18%, needle-like content 13-14%, water absorption 0.75-0.8%; apparent density of 9.5-26.5 mm crushed stone 2.6-2.7 g / cm 3 , crushing value 19.5-20.5%, needle-like content 11.5-12.5%, water absorption 0.2-0.25%.

8. The modified aeolian sand road base material according to claim 1, characterized in that: The cement is P·O42.5 ordinary Portland cement.

9. The modified aeolian sand road base material according to claim 1, characterized in that: The super absorbent resin includes any one or more of ionic super absorbent resin, non-ionic super absorbent resin and composite super absorbent resin; the extra water intake of the super absorbent resin is 10 to 30 times, and the particle size range is 80 to 100 meshes.

10. The method for preparing the modified aeolian sand road base material according to claim 1, characterized in that: The following steps are involved: S11. Aeolian sand with a particle size of 0.01 to 2.36 mm, fine aggregate of 2.36 to 4.75 mm, and coarse aggregate of 4.75 to 26.5 mm are mixed and stirred evenly according to a certain proportion, and the mixture is covered with a plastic wrap for 5 to 7 hours to allow the surface to be fully infiltrated to obtain an infiltrated mixture; S12. The super absorbent resin, cement and modified aeolian sand powder are mixed and stirred in proportion to obtain a mixture; S13. The mixtures obtained in S11 and S12 are mixed and stirred evenly, and then subjected to static pressing and then cured to obtain a modified aeolian sand road base material.

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