Anti-rutting semi-flexible asphalt pavement material and preparation method thereof

Abstract

The application relates to the technical field of semi-flexible pavement preparation, and particularly discloses an anti-rutting semi-flexible asphalt pavement material and a preparation method thereof. The anti-rutting semi-flexible asphalt pavement material provided by the application comprises self-repairing grouting material, phase-change asphalt framework and composite modified asphalt; the self-repairing grouting material comprises Portland cement, nano silicon dioxide, microcapsule self-repairing agent, polyvinyl acetate latex powder, first water reducing agent and water; the phase-change asphalt framework comprises basalt aggregate, modified asphalt, polyester fiber and paraffin phase-change material microcapsules; and the composite modified asphalt comprises rubber powder, modified asphalt and compatilizer. The specific components of the semi-flexible asphalt pavement material are optimized, and the specific components of the self-repairing grouting material, the phase-change asphalt framework and the composite modified asphalt are limited, so that the anti-rutting property, the strength and the crack resistance of the semi-flexible asphalt pavement material are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of semi-flexible pavement preparation technology, and in particular to a rutting-resistant semi-flexible asphalt pavement material and its preparation method. Background Technology

[0002] With the continuous densification and upgrading of modern transportation networks, traffic flow has experienced explosive growth, especially with a significant increase in the proportion of heavy-duty trucks, container trucks, and construction machinery. This has resulted in the static loads and dynamic fatigue stresses borne by road structures far exceeding traditional design standards. Against this backdrop, the inherent temperature sensitivity of flexible pavements, represented by ordinary hot-mix asphalt mixtures, has been dramatically amplified: in hot seasons, the viscosity of the asphalt binder drops sharply, causing irreversible flow deformation of the pavement under vehicle traffic, leading to ruts, swells, and shoving cracks; while in cold seasons, the asphalt material becomes brittle due to cold shrinkage and hardening, making it difficult to withstand the combined effects of thermal shrinkage stress and traffic loads, resulting in a sharp increase in the risk of pavement cracking.

[0003] To address these issues, semi-flexible pavements, combining the driving comfort of asphalt pavements with the rigidity of cement concrete pavements, have emerged. These pavements are created by injecting specially formulated cement-based grout into a porous asphalt matrix, forming a composite structure that combines rigidity and flexibility. Their resistance to rutting is significantly higher than that of ordinary asphalt pavements. However, existing semi-flexible pavement material systems still have significant performance bottlenecks: on the one hand, while the rigid skeleton formed after the cement-based grout hydrates and hardens provides excellent high-temperature deformation resistance, its inherent brittleness and low ultimate tensile strain make the pavement prone to brittle fracture within the mortar or at the interface transition zone under low-temperature environments or heavy-load impacts. On the other hand, excessively increasing the water-cement ratio or the amount of cementitious materials in the grout to achieve early strength and high fluidity often further exacerbates volume shrinkage, inducing delamination between the grout and the asphalt matrix, thus weakening the overall strength and durability. Therefore, how to overcome the limitations of existing material design and develop a new semi-flexible pavement material that can effectively coordinate the rigidity of cement-based materials and the toughness of organic materials while achieving ultra-high temperature rutting resistance, thus possessing excellent rutting resistance, high strength and excellent crack resistance over a wide temperature range, has become a key technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] In view of this, the present invention provides a rutting-resistant semi-flexible asphalt pavement material and its preparation method. The present invention solves the problem that existing semi-flexible asphalt pavement materials cannot simultaneously possess excellent rutting resistance, strength, and crack resistance by rationally designing the composition of the rutting-resistant semi-flexible asphalt pavement material.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: This invention provides a rutting-resistant semi-flexible asphalt pavement material, comprising the following raw material components in parts by weight: 1-2 parts self-healing grout, 3-4 parts phase change asphalt skeleton and 2-3 parts composite modified asphalt; The self-healing grouting material comprises silicate cement, nano-silica, microcapsule self-healing agent, polyvinyl acetate latex powder, first water-reducing agent, and water; the phase change asphalt skeleton comprises basalt aggregate, modified asphalt, polyester fiber, and paraffin phase change material microcapsules; the composite modified asphalt comprises rubber powder, modified asphalt, and compatibilizer. The modified asphalt is epoxy resin and polyurethane resin modified asphalt; the core material of the microcapsule self-healing agent includes allyl epoxy resin, pentaerythritol tetra(3-mercaptopropionic acid) ester, 2-hydroxy-2-methyl-1-phenyl-1-propanone and polyamide.

[0006] Compared to existing technologies, the rutting-resistant semi-flexible asphalt pavement material provided by this invention utilizes nano-silica in its self-healing grout to activate the hydration reaction of silicate cement, filling the micropores of the pavement material and thus improving its density and strength. When the semi-flexible asphalt pavement material cracks, the microcapsules rupture, the core material flows out, and a curing reaction occurs under light irradiation, achieving the repair of the pavement material and significantly improving its rutting resistance and crack resistance. Polyvinyl acetate latex powder forms a flexible polymer film network in the semi-flexible asphalt pavement material, enhancing the adhesion between materials and further improving its rutting resistance and crack resistance.

[0007] Basalt aggregate in the phase change asphalt skeleton can construct a rigid skeleton structure, improving the strength of semi-flexible asphalt pavement materials; epoxy resin can enhance the cohesion of asphalt and improve its rutting resistance, while polyurethane resin gives asphalt excellent flexibility and elongation, relieving stress on semi-flexible asphalt pavement materials under fatigue load conditions, thereby improving its crack resistance; this invention uses specific substances to modify asphalt, giving it a chemical cross-linked structure that combines rigidity and flexibility, significantly improving the rutting resistance, strength, and crack resistance of semi-flexible asphalt pavement materials; the addition of polyester fiber can further prevent crack propagation in semi-flexible asphalt pavement materials, thereby improving their crack resistance; paraffin phase change material microcapsules can absorb latent heat under high temperature conditions, preventing the softening of semi-flexible asphalt pavement materials and significantly improving their rutting resistance and crack resistance.

[0008] In composite modified asphalt, rubber powder acts as a flexible filler, absorbing energy and providing resilience under stress, thus improving the crack resistance and rutting resistance of semi-flexible asphalt pavement materials. The compatibilizer further promotes the uniform dispersion and full swelling of rubber powder in the modified asphalt, forming a stable cross-linked network structure and improving the interfacial adhesion of semi-flexible asphalt pavement materials. The synergistic effect of these three factors gives semi-flexible asphalt pavement materials excellent rutting resistance, strength, and crack resistance.

[0009] Preferably, the silicate cement is P·O 42.5 grade ordinary silicate cement.

[0010] Preferably, the particle size of the nano-silica is 15~20nm.

[0011] Preferably, the microcapsule self-healing agent is purchased from CKM-202 self-healing microcapsules of Hefei Zhongke Chuangwei Technology Co., Ltd.

[0012] Preferably, the polyvinyl acetate latex powder is purchased from Shenyang Xingzhenghe Chemical Co., Ltd. as XZH redispersible latex powder.

[0013] Preferably, the first water-reducing agent is a polycarboxylate water-reducing agent from Jinan Jianhui Chemical Co., Ltd.

[0014] Preferably, the self-healing grout comprises silicate cement, nano-silica, microcapsule self-healing agent, polyvinyl acetate latex powder, first water-reducing agent and water in a mass ratio of 1:(0.0285~0.0315):(0.0475~0.0525):(0.076~0.084):(0.019~0.021):(0.399~0.441).

[0015] Preferably, the basalt aggregate has a particle size of 2.36~16mm.

[0016] More preferably, the basalt aggregate has a crushing value ≤18%, a needle-like particle content ≤15%, and a Los Angeles abrasion loss ≤22%.

[0017] The basalt aggregate provided by this invention needs to meet the requirements of the "Technical Specification for Construction of Highway Asphalt Pavement" (JTG F40) for coarse aggregates used in the surface layer.

[0018] Preferably, the modified asphalt has a viscosity of 60000~80000 Pa·s at 60℃, an asphalt ductility of 30~50 cm at 5℃, a softening point of 85~95℃, and a PG grade of 28~82.

[0019] More preferably, the modified asphalt is epoxy polyurethane modified asphalt purchased from Fenyangtang (Shanghai) Industrial Co., Ltd.

[0020] Preferably, the polyester fiber has a length of 6-12 mm, a diameter of 12-20 μm, and a tensile strength of 500-650 MPa.

[0021] This invention enhances the crack resistance and toughness of materials by selecting specific polyester fibers, preventing the paraffin phase change material microcapsules from rupturing during mixing and rolling.

[0022] Preferably, the paraffin phase change material microcapsules have a particle size of 10~100μm, a phase change temperature of 26~32℃, a coating content of ≥80%, and an enthalpy of ≥160kJ / kg.

[0023] Preferably, the paraffin phase change material microcapsules are purchased from Liaocheng Xinshengda New Energy Technology Co., Ltd.

[0024] Preferably, the phase change asphalt skeleton comprises basalt aggregate, modified asphalt, polyester fiber, and paraffin phase change material microcapsules in a mass ratio of 100:(3.3~4.3):(0.3~0.5):(0.2~0.3).

[0025] Preferably, the rubber powder is waste tire rubber powder.

[0026] Preferably, the particle size of the rubber powder is 60-80 mesh.

[0027] This invention improves the uniformity of the rubber powder's integration with modified asphalt by limiting the particle size of the rubber powder.

[0028] More preferably, the rubber powder has an ash content ≤1.5%, a carbon black content ≥28%, a rubber hydrocarbon content ≥48%, a moisture content <1%, and an iron content <0.03%.

[0029] The ash and metal content in rubber powder can affect the storage performance of semi-flexible asphalt pavement materials, and their content needs to be strictly controlled. Furthermore, by controlling the carbon black and rubber hydrocarbon content in the rubber powder, the elasticity and durability of the modified asphalt can be further guaranteed.

[0030] More preferably, the rubber powder is 60-80 mesh waste tire rubber powder purchased from Lingshou County Zhanxing Mineral Products Co., Ltd.

[0031] Preferably, the compatibilizer is an ethylene-ethyl acrylate copolymer compatibilizer purchased from Guangdong Youxin Rubber & Plastics Co., Ltd.

[0032] Preferably, the composite modified asphalt comprises rubber powder, modified asphalt, and compatibilizer in a mass ratio of 100:(19~21):(0.95~1.05).

[0033] Preferably, the rutting-resistant semi-flexible asphalt pavement material further includes the following raw material components in parts by weight: 4-5 parts of conductive cement-based grout.

[0034] More preferably, the conductive cement-based grout comprises silicate cement, carbon fiber, graphene, a second water-reducing agent, an expanding agent, and water in a mass ratio of 1:(0.00475~0.00525):(0.00285~0.00315):(0.019~0.021):(0.076~0.084):(0.38~0.42).

[0035] This invention optimizes the composition of conductive cement-based grout, ensuring the strength of semi-flexible asphalt pavement materials while also imparting a certain degree of conductivity. This allows it to be used in conjunction with a low-voltage heating system to melt snow and ice on the road surface in winter. Simultaneously, by pre-setting electrode sensors in the semi-flexible asphalt pavement material, it enables real-time detection of resistance changes, achieving early warning of pavement cracks.

[0036] More preferably, the silicate cement is P·O 42.5 grade ordinary silicate cement.

[0037] More preferably, the carbon fiber has a length of 5.4~6.6 mm and a diameter of 6.3~7.7 μm.

[0038] More preferably, the carbon fiber is polyacrylonitrile-based carbon fiber.

[0039] More preferably, the carbon fiber is T700 polyacrylonitrile-based carbon fiber purchased from Shanghai Lishuo Composite Materials Technology Co., Ltd.

[0040] More preferably, the graphene is sheet-like graphene.

[0041] More preferably, the graphene has a thickness of 1-5 nm, a sheet diameter of 5-20 μm, and a specific surface area ≥500 m². 2 / g, resistivity ≤1×10 -6 Ω·cm.

[0042] More preferably, the graphene is 30,000 mesh sheet graphene purchased from Shandong Xinbaiyi Metal Materials Co., Ltd.

[0043] More preferably, the second water-reducing agent is a polycarboxylate-based high-efficiency water-reducing agent.

[0044] More preferably, the second water-reducing agent has a water reduction rate of ≥35%, a solid content of 20%, and a chloride ion content of ≤0.02%.

[0045] More preferably, the second water-reducing agent is LT-01A polycarboxylate-based high-efficiency water-reducing agent purchased from Xingtai Lantian Fine Chemical Co., Ltd.

[0046] This invention uses a specific second water-reducing agent, which can effectively reduce the water-cement ratio while significantly improving the fluidity of the grout and ensuring its workability.

[0047] More preferably, the expanding agent is an ettringite-based expanding agent.

[0048] More preferably, the expansion agent has a 7-day restricted expansion rate ≥ 0.025% and a 28-day restricted expansion rate ≥ 0.015%.

[0049] The preferred expansion agent of this invention does not contain alkali metal components, which can compensate for the shrinkage during the hardening process of the grout and avoid cracking problems.

[0050] More preferably, the expansion agent is HCSA concrete expansion agent purchased from Zhengzhou Jianwen Special Materials Technology Co., Ltd.

[0051] This invention provides a method for preparing the above-mentioned rutting-resistant semi-flexible asphalt pavement material, comprising the following steps: S1. Weigh each component according to the mass ratio, mix the components of the self-healing grout except for water evenly, and then add water to obtain the first mixture. S2. Mix all components in the phase change asphalt skeleton evenly to obtain a second mixture; S3. Mix all components in the composite modified asphalt evenly to obtain a third mixture; S4. Mix all components except water in the conductive cement-based grouting material evenly, and then add water to obtain the fourth mixture. S5. Mix the first mixture, the second mixture, the third mixture and the fourth mixture evenly to obtain a rutting-resistant semi-flexible asphalt pavement material.

[0052] The method for preparing rutting-resistant semi-flexible asphalt pavement material provided by this invention has a simple operation process and does not require complex mixing equipment. While reducing the construction difficulty, it significantly improves the performance of the material and provides a new approach for the preparation of semi-flexible asphalt pavement materials. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0054] In the embodiments and comparative examples provided by this invention, the silicate cement is P·O42.5 grade ordinary silicate cement; the microcapsule self-healing agent is CKM-202 self-healing microcapsules purchased from Hefei Zhongke Chuangwei Technology Co., Ltd.; the polyvinyl acetate latex powder is XZH redispersible latex powder purchased from Shenyang Xingzhenghe Chemical Co., Ltd.; the first water-reducing agent is polycarboxylate water-reducing agent purchased from Jinan Jianhui Chemical Co., Ltd.; the modified asphalt is epoxy polyurethane modified asphalt purchased from Fenyangtang (Shanghai) Industrial Co., Ltd.; and the paraffin phase change material microcapsules are paraffin phase change material microcapsules purchased from Liaocheng Xinshengda New Energy Technology Co., Ltd. The following materials were used: rubber powder (60-80 mesh waste tire rubber powder) purchased from Lingshou County Zhanxing Mineral Products Co., Ltd.; compatibilizer (ethylene-ethyl acrylate copolymer compatibilizer) purchased from Guangdong Youxin Rubber & Plastics Co., Ltd.; carbon fiber (T700 polyacrylonitrile-based carbon fiber) purchased from Shanghai Lishuo Composite Materials Technology Co., Ltd.; graphene (30,000 mesh sheet graphene) purchased from Shandong Xinbaiyi Metal Materials Co., Ltd.; secondary water-reducing agent (LT-01A polycarboxylate-based high-efficiency water-reducing agent) purchased from Xingtai Lantian Fine Chemical Co., Ltd.; and expansion agent (HCSA concrete expansion agent) purchased from Zhengzhou Jianwen Special Materials Technology Co., Ltd.

[0055] Unless otherwise specified, the raw materials and reagents used in this invention are all conventional commercially available products; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0056] Example 1 This embodiment provides a rutting-resistant semi-flexible asphalt pavement material, comprising the following raw material components in parts by weight: One part self-healing grout, four parts phase change asphalt skeleton, two parts composite modified asphalt, and four parts conductive cement-based grout; The self-healing grouting material includes silicate cement in a mass ratio of 1:0.03:0.05:0.08:0.02:0.42, nano-silica with a particle size of 15~20nm, microcapsule self-healing agent, polyvinyl acetate latex powder, first water-reducing agent and water; The phase change asphalt skeleton comprises basalt aggregate, modified asphalt, polyester fiber, and paraffin phase change material microcapsules in a mass ratio of 100:4:0.4:0.2. The basalt aggregate has a particle size of 8-12 mm, a crushing value of 14%, a needle-like / flaky particle content of 15%, and a Los Angeles abrasion loss of 10%. The polyester fiber has a length of 8-10 mm, a diameter of 12-15 μm, and a tensile strength of 600 MPa. The composite modified asphalt comprises rubber powder, modified asphalt, and compatibilizer in a mass ratio of 100:20:1; The conductive cement-based grouting material comprises silicate cement, carbon fiber, graphene, a second water-reducing agent, an expansion agent, and water in a mass ratio of 1:0.005:0.003:0.02:0.078:0.4.

[0057] This embodiment also provides a method for preparing the above-mentioned rutting-resistant semi-flexible asphalt pavement material, including the following steps: S1. Weigh each component according to the mass ratio, mix the components of the self-healing grout except for water evenly, and then add water to obtain the first mixture. S2. Mix all components in the phase change asphalt skeleton evenly to obtain the second mixture; S3. Mix all components of the composite modified asphalt evenly to obtain the third mixture; S4. Mix all components of the conductive cement-based grout except water evenly, then add water to obtain the fourth mixture. S5. Mix the first mixture, the second mixture, the third mixture and the fourth mixture evenly to obtain a rutting-resistant semi-flexible asphalt pavement material.

[0058] Example 2 This embodiment provides a rutting-resistant semi-flexible asphalt pavement material, comprising the following raw material components in parts by weight: Two parts of self-healing grout, three parts of phase change asphalt skeleton, three parts of composite modified asphalt, and five parts of conductive cement-based grout; The self-healing grouting material includes silicate cement in a mass ratio of 1:0.029:0.052:0.082:0.021:0.44, nano-silica with a particle size of 15~20nm, microcapsule self-healing agent, polyvinyl acetate latex powder, first water-reducing agent and water; The phase change asphalt skeleton comprises basalt aggregate, modified asphalt, polyester fiber, and paraffin phase change material microcapsules in a mass ratio of 100:4.2:0.5:0.3. The basalt aggregate has a particle size of 4-6 mm, a crushing value of 12%, a needle-like / flaky particle content of 10%, and a Los Angeles abrasion loss of 20%. The polyester fiber has a length of 10-12 mm, a diameter of 14-16 μm, and a tensile strength of 635 MPa. The composite modified asphalt comprises rubber powder, modified asphalt, and compatibilizer in a mass ratio of 100:21:1; The conductive cement-based grouting material comprises silicate cement, carbon fiber, graphene, a second water-reducing agent, an expansion agent, and water in a mass ratio of 1:0.0049:0.0031:0.021:0.08:0.42.

[0059] This embodiment also provides a method for preparing the above-mentioned rutting-resistant semi-flexible asphalt pavement material, including the following steps: S1. Weigh each component according to the mass ratio, mix the components of the self-healing grout except for water evenly, and then add water to obtain the first mixture. S2. Mix all components in the phase change asphalt skeleton evenly to obtain the second mixture; S3. Mix all components of the composite modified asphalt evenly to obtain the third mixture; S4. Mix all components of the conductive cement-based grout except water evenly, then add water to obtain the fourth mixture. S5. Mix the first mixture, the second mixture, the third mixture and the fourth mixture evenly to obtain a rutting-resistant semi-flexible asphalt pavement material.

[0060] Example 3 This embodiment provides a rutting-resistant semi-flexible asphalt pavement material, comprising the following raw material components in parts by weight: Two parts of self-healing grout, four parts of phase change asphalt skeleton, two parts of composite modified asphalt, and five parts of conductive cement-based grout; The self-healing grouting material includes silicate cement in a mass ratio of 1:0.03:0.05:0.08:0.021:0.42, nano-silica with a particle size of 15~20nm, microcapsule self-healing agent, polyvinyl acetate latex powder, first water-reducing agent and water; The phase change asphalt skeleton comprises basalt aggregate, modified asphalt, polyester fiber, and paraffin phase change material microcapsules in a mass ratio of 100:4:0.4:0.2. The basalt aggregate has a particle size of 14-16 mm, a crushing value of 14%, a needle-like / flaky particle content of 12%, and a Los Angeles abrasion loss of 20%. The polyester fiber has a length of 10-12 mm, a diameter of 14-16 μm, and a tensile strength of 615 MPa. The composite modified asphalt comprises rubber powder, modified asphalt, and compatibilizer in a mass ratio of 100:21:1; The conductive cement-based grouting material comprises silicate cement, carbon fiber, graphene, a second water-reducing agent, an expansion agent, and water in a mass ratio of 1:0.0048:0.003:0.02:0.081:0.41.

[0061] This embodiment also provides a method for preparing the above-mentioned rutting-resistant semi-flexible asphalt pavement material, including the following steps: S1. Weigh each component according to the mass ratio, mix the components of the self-healing grout except for water evenly, and then add water to obtain the first mixture. S2. Mix all components in the phase change asphalt skeleton evenly to obtain the second mixture; S3. Mix all components of the composite modified asphalt evenly to obtain the third mixture; S4. Mix all components of the conductive cement-based grout except water evenly, then add water to obtain the fourth mixture. S5. Mix the first mixture, the second mixture, the third mixture and the fourth mixture evenly to obtain a rutting-resistant semi-flexible asphalt pavement material.

[0062] Comparative Example 1 This comparative example provides a semi-flexible asphalt pavement material, which differs from Example 1 in that: the modified asphalt in both the phase change asphalt skeleton and the composite modified asphalt is replaced with an equal amount of asphalt, namely No. 70 Grade A road petroleum asphalt purchased from Xingtai Lianhe Asphalt Sales Co., Ltd. The other components and preparation methods remain unchanged, and will not be repeated here.

[0063] Comparative Example 2 This comparative example provides a semi-flexible asphalt pavement material, which differs from Example 1 in that: the polyvinyl acetate latex powder is replaced with an equal amount of styrene-butadiene rubber powder (SBR) from Jinan Zhengxing Chemical Co., Ltd. The other components and preparation methods remain unchanged, and will not be repeated here.

[0064] The performance of the semi-flexible asphalt pavement materials provided in the embodiments and comparative examples of the present invention was tested. The rutting dynamic stability, splitting tensile strength and Marshall stability were tested according to the test methods in JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0065] The specific test results are shown in Table 1.

[0066] Table 1

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rutting-resistant semi-flexible asphalt pavement material, characterized in that, The raw material components include the following parts by mass: 1-2 parts self-healing grout, 3-4 parts phase change asphalt skeleton and 2-3 parts composite modified asphalt; The self-healing grouting material comprises silicate cement, nano-silica, microcapsule self-healing agent, polyvinyl acetate latex powder, first water-reducing agent, and water; the phase change asphalt skeleton comprises basalt aggregate, modified asphalt, polyester fiber, and paraffin phase change material microcapsules; the composite modified asphalt comprises rubber powder, modified asphalt, and compatibilizer. The modified asphalt is epoxy resin and polyurethane resin modified asphalt; the core material of the microcapsule self-healing agent includes allyl epoxy resin, pentaerythritol tetra(3-mercaptopropionic acid) ester, 2-hydroxy-2-methyl-1-phenyl-1-propanone and polyamide.

2. The rutting-resistant semi-flexible asphalt pavement material as described in claim 1, characterized in that, The self-healing grouting material comprises silicate cement, nano-silica, microcapsule self-healing agent, polyvinyl acetate latex powder, first water-reducing agent, and water in a mass ratio of 1:(0.0285~0.0315):(0.0475~0.0525):(0.076~0.084):(0.019~0.021):(0.399~0.441).

3. The rutting-resistant semi-flexible asphalt pavement material as described in claim 1 or 2, characterized in that, The particle size of the nano-silica is 15~20nm.

4. The rutting-resistant semi-flexible asphalt pavement material as described in claim 1, characterized in that, The phase change asphalt skeleton comprises basalt aggregate, modified asphalt, polyester fiber, and paraffin phase change material microcapsules in a mass ratio of 100:(3.3~4.3):(0.3~0.5):(0.2~0.3).

5. The rutting-resistant semi-flexible asphalt pavement material as described in claim 1 or 4, characterized in that, The basalt aggregate has a particle size of 2.36~16mm; The basalt aggregate has a crushing value ≤18%, a needle-like and flaky particle content ≤15%, and a Los Angeles abrasion loss ≤22%. The modified asphalt has a viscosity of 60,000~80,000 Pa·s at 60℃, an asphalt ductility of 30~50 cm at 5℃, a softening point of 85~95℃, and a PG grade of 28~82. The polyester fiber has a length of 6~12mm, a diameter of 12~20μm, and a tensile strength of 500~650MPa; The paraffin phase change material microcapsules have a particle size of 10~100μm, a phase change temperature of 26~32℃, a coating content of ≥80%, and an enthalpy of ≥160kJ / kg.

6. The rutting-resistant semi-flexible asphalt pavement material as described in claim 1, characterized in that, The composite modified asphalt comprises rubber powder, modified asphalt, and compatibilizer in a mass ratio of 100:(19~21):(0.95~1.05).

7. The rutting-resistant semi-flexible asphalt pavement material as described in claim 1 or 6, characterized in that, The particle size of the rubber powder is 60-80 mesh; The rubber powder has an ash content ≤1.5%, a carbon black content ≥28%, a rubber hydrocarbon content ≥48%, a moisture content <1%, and an iron content <0.03%.

8. The rutting-resistant semi-flexible asphalt pavement material as described in claim 1, characterized in that, The anti-rutting semi-flexible asphalt pavement material also includes the following raw material components in parts by weight: 4-5 parts of conductive cement-based grout.

9. The rutting-resistant semi-flexible asphalt pavement material as described in claim 8, characterized in that, The conductive cement-based grout comprises silicate cement, carbon fiber, graphene, a second water-reducing agent, an expanding agent, and water in a mass ratio of 1:(0.00475~0.00525):(0.00285~0.00315):(0.019~0.021):(0.076~0.084):(0.38~0.42).

10. A method for preparing a rutting-resistant semi-flexible asphalt pavement material according to any one of claims 1 to 9, comprising the following steps: S1. Weigh each component according to the mass ratio, mix the components of the self-healing grout except for water evenly, and then add water to obtain the first mixture. S2. Mix all components in the phase change asphalt skeleton evenly to obtain a second mixture; S3. Mix all components in the composite modified asphalt evenly to obtain a third mixture; S4. Mix all components except water in the conductive cement-based grouting material evenly, and then add water to obtain the fourth mixture. S5. Mix the first mixture, the second mixture, the third mixture and the fourth mixture evenly to obtain a rutting-resistant semi-flexible asphalt pavement material.

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