An environmentally friendly asphalt pavement structure with high anti-skid performance and its construction method

Abstract

The present invention discloses an environmentally friendly asphalt pavement structure with high anti-skid performance, which includes a base layer, an intermediate functional layer, and a surface layer laid sequentially from bottom to top; wherein the surface layer includes fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, matrix asphalt, and additives compounded in proportion. The asphalt pavement structure of the present invention not only significantly improves the anti-skid performance of the pavement, but also enhances the wear resistance and durability of the pavement. It has excellent thermal insulation, noise reduction, and drainage properties, while ensuring good construction performance and environmental adaptability. The overall comprehensive performance is superior and can meet the long-term durability and stability requirements under different climatic conditions and traffic flows. The present invention also discloses a construction method for an environmentally friendly asphalt pavement structure with high anti-skid performance.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt pavement, and in particular to an environmentally friendly asphalt pavement structure with high anti-skid performance and a construction method thereof. Background Art

[0002] Asphalt pavement is widely used in road construction due to its excellent construction performance and economic efficiency. However, traditional asphalt pavements present several challenges during use. First, the skid resistance of asphalt pavements deteriorates with long-term use, especially in humid conditions, where the formation of a water film further reduces friction between tires and the road surface, increasing the risk of slippage. Second, asphalt ages under the long-term effects of environmental factors (such as ultraviolet light, oxygen, and temperature fluctuations), causing it to harden, become brittle, and lose its elasticity. This, in turn, affects aggregate adhesion, accelerates aggregate loss, and reduces the pavement's skid resistance. Furthermore, environmental moisture and chemicals (such as acid rain and oil pollution) corrode asphalt and aggregate, further weakening the pavement's structural performance. Construction quality is also a significant factor affecting asphalt pavement performance. Improper aggregate selection, flawed construction techniques, and inadequate temperature control can lead to insufficient pavement smoothness and density, compromising its skid resistance and durability. Frequent traffic loads, especially heavy vehicle traffic, accelerate pavement wear, leading to aggregate loss and loss of texture. The combined effect of these factors has resulted in deficiencies in traditional asphalt pavement in terms of skid resistance, wear resistance, durability and environmental adaptability, requiring improvement to meet the needs of modern transportation. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an environmentally friendly asphalt pavement structure with high anti-skid performance to solve the shortcomings of traditional asphalt pavements in anti-skid performance, wear resistance, durability and environmental adaptability, especially the technical problems of decreased anti-skid performance under wet conditions, short service life and environmental unfriendliness.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A highly skid-resistant, environmentally friendly asphalt pavement structure comprises a base layer, an intermediate functional layer, and a surface layer laid sequentially from bottom to top; wherein the surface layer comprises fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, matrix asphalt, and additives compounded in proportion.

[0006] As a preferred technical solution, the base layer comprises the following raw materials in parts by weight: 20 to 30 parts of polystyrene foam and 70 to 80 parts of modified emulsified asphalt.

[0007] As a preferred technical solution, the intermediate functional layer includes the following raw materials in parts by weight: 25 to 35 parts of epoxy modified asphalt, 110 to 130 parts of aggregate, 14 to 18 parts of mineral powder, 12 to 18 parts of expanded perlite particles and 8 to 12 parts of porous ceramic particles.

[0008] As a preferred technical solution, the fiber-modified waste asphalt preparation method comprises the following steps: first, the fiber is oxidized with hydrogen peroxide and then oxidized with sodium periodate to obtain surface-carboxylated fiber; concurrently, the waste asphalt is soaked in an acidic solution for a period of time; finally, the modified carboxylated fiber and waste asphalt are added to a container, and a mixed solution of 1H,1H,9H,9H-perfluoro-1,9-nonanediol and ethylene glycol is added. The mixture is stirred and reacted at 80°C for 2 hours to obtain the fiber-modified waste asphalt. The fiber-modified waste asphalt preparation method of the present invention significantly improves the properties of the waste asphalt through a series of chemical treatments. First, the fiber is surface-carboxylated after oxidation with hydrogen peroxide and treatment with sodium periodate, which increases the fiber's active sites, enabling it to form stronger chemical bonds with the waste asphalt. Second, the waste asphalt is pretreated with an acidic solution to further activate its surface and enhance its compatibility with the fiber and other modifiers. Furthermore, the addition of 1H,1H,9H,9H-perfluoro-1,9-nonanediol imparts excellent hydrophobicity to the modified asphalt, reducing the negative impact of moisture on pavement performance. Finally, the inclusion of ethylene glycol promotes uniformity in the reaction system, ensuring an efficient modification process. These combined technologies ensure that the fiber-modified waste asphalt not only exhibits excellent skid resistance and wear resistance, but also possesses excellent hydrophobicity and chemical stability, effectively extending the pavement's service life and improving its stability in harsh environmental conditions.

[0009] As a preferred technical solution, the method for preparing waste asphalt chemically modified with a shape memory polymer comprises: modifying waste asphalt with end hydroxyl groups to obtain a waste asphalt liquid; then, adding polyether polyol and adamantane diol and stirring uniformly; then, adding diisocyanate and a catalyst; and stirring the mixture at 80°C for 2 hours to obtain the shape memory polymer chemically modified waste asphalt. The method for preparing waste asphalt chemically modified with a shape memory polymer in this invention achieves higher reactivity in the waste asphalt liquid through end hydroxyl group modification, laying the foundation for subsequent chemical modification. The addition of polyether polyol and adamantane diol not only enhances the flexibility and elasticity of the modified asphalt but also imparts shape memory properties, enabling it to return to its preset shape upon temperature changes, effectively reducing pavement cracks caused by temperature fluctuations. The use of diisocyanate and catalyst promotes the polymerization reaction, forming a shape memory polymer network structure with excellent mechanical properties and chemical stability. The combined effect of these technical means enables shape memory polymer chemically modified waste asphalt to not only have excellent crack resistance and shape recovery capabilities, but also good wear resistance and anti-skid properties, significantly improving the durability and stability of the road surface, effectively extending the service life of the road surface, and reducing maintenance costs.

[0010] As a preferred technical solution, the polyether polyol is at least one of polyether polyol NJ-8307, polyether polyol NJ-6209, polyether polyol NJ-330 and polyether polyol NJ-220.

[0011] As a preferred technical solution, the adamantane diol is at least one of 1,3-adamantanedimethanol, 4-methyladamantane-1,4-diol, and 1,4-adamantanediol.

[0012] As a preferred technical solution, the diisocyanate is at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

[0013] As a preferred technical solution, the surface layer raw materials also contain modified titanium dioxide production waste residue. By incorporating modified titanium dioxide production waste residue into the surface layer raw materials, this invention achieves resource recycling while significantly improving the overall performance of the surface layer. Titanium dioxide production waste residue is primarily composed of titanium dioxide (TiO2), which plays a number of important roles in the surface layer. First, titanium dioxide has a high refractive index and excellent optical properties, which improves the reflectivity of the road surface, enhancing visibility at night or in low-light conditions, and contributing to improved driving safety. Second, titanium dioxide has excellent chemical stability and weather resistance, enhancing the surface layer's aging resistance, ensuring it maintains excellent performance even after long-term exposure to the elements. Furthermore, titanium dioxide's high hardness improves the surface's wear resistance and anti-skid properties, reducing wear during vehicle operation and extending its service life. Furthermore, its surface activity improves the adhesion between asphalt and aggregate, enhancing the overall stability of the surface layer. In summary, the addition of modified titanium dioxide production waste not only optimizes the anti-slip, wear-resistant and optical properties of the surface layer, but also brings significant environmental benefits, reflecting the dual advantages of the present invention in terms of technology and environmental protection.

[0014] As a preferred technical solution, the auxiliary agent consists of an anti-stripping agent and an anti-aging agent.

[0015] Another aspect of the present invention is to provide a construction method for the above-mentioned environmentally friendly asphalt pavement structure with high anti-skid performance, the construction method comprising the following steps:

[0016] S1: Mix 20-30 parts of polystyrene foam and 70-80 parts of modified emulsified asphalt evenly, and spread them on the roadbed using a paver to obtain a smooth base layer that is tightly bonded to the roadbed;

[0017] S2: 25-35 parts of epoxy modified asphalt, 110-130 parts of aggregate, 14-18 parts of mineral powder, 12-18 parts of expanded perlite particles, and 8-12 parts of porous ceramic particles are mixed in proportion, mixed thoroughly and evenly using a mixing device, and then paved on the base layer obtained in step S1 using a paver to obtain an intermediate functional layer;

[0018] S3: Fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, and matrix asphalt are mixed in a ratio of 1:1:2, and appropriate amounts of additives and modified titanium dioxide production waste residue are added. The mixture is fully mixed using a mixing device, and then a paver is used to lay the mixture on the intermediate functional layer obtained in step S2, and finally the environmentally friendly asphalt pavement structure with high anti-skid performance is paved.

[0019] The base layer of the present invention serves as the foundation of the entire asphalt pavement structure, primarily providing support and insulation. By utilizing a composite material of polystyrene foam and modified emulsified asphalt, the base layer not only provides excellent thermal insulation, reducing downward heat transfer, but also enhances the stability of the overall structure. This thermal insulation helps reduce the impact of temperature fluctuations on the pavement, slowing the aging process of asphalt and indirectly improving the pavement's anti-skid properties. Furthermore, the base layer's smoothness and close integration with the roadbed ensure a good foundation for the intermediate functional layer and surface layer, guaranteeing the stability and durability of the entire pavement structure.

[0020] The intermediate functional layer of the present invention mainly plays the role of enhancing the overall performance of the pavement and providing specific functions through its specific material ratio and structural design. The use of epoxy modified asphalt enhances the chemical stability and mechanical properties of the asphalt, delays the aging process of the material, and at the same time improves the adhesion with the aggregate. Aggregate, as the main aggregate, provides high strength and good wear resistance, enhancing the bearing capacity and anti-skid performance of the pavement. Mineral powder fills the gaps between the aggregates, improves the density and stability of the mixture, and further enhances the crack resistance and durability of the pavement. The addition of expanded perlite particles and porous ceramic particles not only provides good heat insulation and sound insulation effects, but also enhances the drainage performance of the pavement, reduces the water film formed by rainwater on the pavement, and thus increases the friction between the tire and the pavement. In addition, the high modulus and shear resistance of the intermediate functional layer can effectively cope with traffic loads, reduce aggregate shedding and pavement wear, and further improve the anti-skid performance and service life of the pavement.

[0021] The surface layer of the present invention is the part that is in direct contact with vehicle tires, and its performance directly affects the anti-skid performance of the road surface. The use of fiber-modified waste asphalt and shape memory polymer chemically modified waste asphalt not only enhances the microtexture and wear resistance of the road surface, but also provides high modulus and shape recovery ability, which can maintain the edges and corners of the aggregate under the action of vehicle load and reduce the surface smoothing phenomenon. The addition of matrix asphalt ensures the flexibility and crack resistance of the surface layer, while the use of additives and modified titanium dioxide production waste residue further improves the anti-skid performance and environmental protection performance of the surface layer. The hydrophobic modification of the surface layer reduces the impact of rainwater and enhances the interfacial adhesion between asphalt and aggregate, thereby significantly improving the anti-skid performance and durability of the road surface.

[0022] Beneficial effects of the present invention:

[0023] The environmentally friendly asphalt pavement structure with high anti-skid performance of the present invention not only significantly improves the anti-skid performance of the pavement, but also optimizes multiple functions such as heat insulation, noise reduction, drainage, and wear resistance by using an innovative combination of polystyrene foam and modified emulsified asphalt composite materials, multiple modified asphalts, and specific additives in the base layer, intermediate functional layer, and surface layer, respectively. In particular, the synergistic application of fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, and modified titanium dioxide production waste residue in the surface layer greatly enhances the microtexture and wear resistance of the pavement, giving the pavement a high modulus and shape recovery ability, allowing it to maintain the angularity of the aggregate under vehicle loads and reduce surface smoothing. This design not only enhances the overall stability and durability of the pavement, but also maintains good construction performance and environmental adaptability, helping to reduce pavement maintenance costs and improve driving safety.

[0024] In general, the environmentally friendly asphalt pavement structure with high anti-skid performance of the present invention not only has excellent anti-skid performance and wear resistance, but also has good environmental performance and economy, and can meet the long-term durability and stability requirements under different climatic conditions and traffic flows. DETAILED DESCRIPTION

[0025] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0026] Example 1

[0027] This example of an environmentally friendly, high-skid-resistant asphalt pavement structure comprises a base layer, an intermediate functional layer, and a surface layer, laid sequentially from bottom to top. The surface layer comprises fiber-modified waste asphalt, shape-memory polymer chemically modified waste asphalt, and base asphalt, all mixed in a mass ratio of 1:1:2. Additives comprise 5% of the total mass and 10% of the total mass of waste residue from modified titanium dioxide production. The additives consist of 3 parts by weight of polyethylene wax (an anti-stripping agent) and 2 parts of 2246 (an anti-aging agent). The base layer comprises the following raw materials in parts by weight: 25 parts polystyrene foam and 75 parts modified emulsified asphalt. The intermediate functional layer comprises the following raw materials in parts by weight: 30 parts epoxy-modified asphalt, 120 parts aggregate (basalt crushed stone), 16 parts mineral powder (limestone powder), 15 parts expanded perlite particles, and 10 parts porous ceramic particles.

[0028] The preparation method for fiber-modified waste asphalt is as follows: First, a fiber material (such as polypropylene fiber) is treated in a 30% hydrogen peroxide solution at 60°C for 2 hours, then rinsed with deionized water and dried to introduce reactive groups such as hydroxyl and carboxyl groups. Next, the fiber is placed in a 0.1 mol / L sodium periodate solution and reacted at 40°C for 2 hours to further carboxylate the fiber. After the reaction, the fiber is rinsed and dried. Simultaneously, the waste asphalt is heated to 120°C to soften it, then soaked in a 0.1 mol / L hydrochloric acid solution for 1 hour to remove impurities and activate the surface. The fiber is then rinsed and dried. Finally, the carboxylated fiber and waste asphalt are mixed in a weight ratio of 1:10. A mixed solution of 5% 1H,1H,9H,9H-perfluoro-1,9-nonanediol and 5% ethylene glycol, representing 5% of the total weight of the mixture, is added. The mixture is stirred and reacted at 80°C for 2 hours. After cooling to room temperature, the fiber-modified waste asphalt is obtained.

[0029] The preparation method for chemically modified waste asphalt with a shape memory polymer comprises heating the waste asphalt to 120°C to soften it, treating it with a 0.1 mol / L hydrogen peroxide solution at 80°C with ultrasonic-assisted stirring for 2 hours, then washing and drying it. The resulting dry product is then immersed in ethylene glycol at a mass ratio of 1:30 and dissolved for 10 hours to produce a waste asphalt liquid. The waste asphalt liquid is then mixed and stirred evenly with 10% polyether polyol NJ-8307 and 5% 1,3-adamantanedimethanol. Next, 10% isophorone diisocyanate (IPDI) and 0.5% dibutyltin dilaurate (catalyst) are added to the mixture, stirring the mixture at 80°C for 2 hours. After cooling to room temperature, the shape memory polymer chemically modified waste asphalt is obtained.

[0030] The preparation method of the modified titanium dioxide production waste residue comprises: washing the titanium dioxide production waste residue with clean water, sieving it through 0.075 mm and 2 mm sieves; removing ferromagnetic impurities using magnetic separation equipment, then adding the waste residue and a silane coupling agent (KH-540) at a mass ratio of 100:1 to a tetrahydrofuran solvent (mass-to-volume ratio of 1:2), mixing, stirring at 80°C for 2 hours, and then drying; finally, calcining the surface-modified waste residue at a high temperature of 600°C for 2 hours.

[0031] This embodiment is a construction method of the above-mentioned environmentally friendly asphalt pavement structure with high anti-skid performance, which includes the following steps:

[0032] S1: Mix 25 parts of polystyrene foam and 75 parts of modified emulsified asphalt evenly, spread them on the roadbed using a paver, and compact them to a designed thickness of 0.4 cm to obtain a flat base layer that is tightly bonded to the roadbed.

[0033] S2: Mix 30 parts of epoxy modified asphalt, 120 parts of aggregate (basalt crushed stone), 16 parts of mineral powder (limestone mineral powder), 15 parts of expanded perlite particles and 10 parts of porous ceramic particles in proportion, use a mixing equipment to fully mix them evenly, and then use a paver to lay them on the base layer obtained in step S1 and compact them to the designed thickness of 4 cm to obtain an intermediate functional layer.

[0034] S3: Fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, and base asphalt are mixed in a ratio of 1:1:2, and at the same time, 5% by weight of additives (3 parts of anti-stripping agent and 2 parts of anti-aging agent) and 10% by weight of modified titanium dioxide production waste residue are added. The mixture is thoroughly mixed using a mixing device, and then laid on the intermediate functional layer obtained in step S2 using a paver, compacted to a designed thickness of 2 cm, and finally paved to obtain the environmentally friendly asphalt pavement structure with high anti-skid performance.

[0035] Example 2

[0036] This example of an environmentally friendly, skid-resistant asphalt pavement structure comprises a base layer, an intermediate functional layer, and a surface layer, laid sequentially from bottom to top. The surface layer comprises fiber-modified waste asphalt, shape-memory polymer chemically modified waste asphalt, and base asphalt, all mixed in a mass ratio of 2:3:5. Additives comprise 6% of the total mass, and 9% of the total mass, derived from waste residue from modified titanium dioxide production. The additives consist of 3 parts by weight of polyethylene wax (an anti-stripping agent) and 3 parts of 2246 (an anti-aging agent). The base layer comprises the following raw materials in parts by weight: 22 parts polystyrene foam and 78 parts modified emulsified asphalt. The intermediate functional layer comprises the following raw materials in parts by weight: 28 parts epoxy-modified asphalt, 125 parts aggregate (basalt crushed stone), 15 parts mineral powder (limestone powder), 14 parts expanded perlite particles, and 11 parts porous ceramic particles.

[0037] The fiber-modified waste asphalt is the same as that in Example 1. The modified titanium dioxide production waste residue is the same as that in Example 1.

[0038] The preparation method for chemically modified waste asphalt with a shape memory polymer comprises heating the waste asphalt to 120°C to soften it, treating it with a 0.1 mol / L hydrogen peroxide solution at 80°C with ultrasonic-assisted stirring for 2 hours, and then washing and drying it. The resulting dry product is then immersed in ethylene glycol at a mass ratio of 1:30 and dissolved for 10 hours to produce a waste asphalt liquid. The waste asphalt liquid is then mixed and stirred evenly with 12% polyether polyol NJ-6209 and 6% 4-methyladamantane-1,4-diol, representing 12% by weight of the mixture. Next, 12% toluene diisocyanate (TDI) and 0.6% dibutyltin dilaurate as a catalyst are added to the mixture. The mixture is stirred at 80°C for 2 hours, and then cooled to room temperature to produce the shape memory polymer chemically modified waste asphalt.

[0039] This embodiment is a construction method of the above-mentioned environmentally friendly asphalt pavement structure with high anti-skid performance, which includes the following steps:

[0040] S1: Mix 22 parts of polystyrene foam and 78 parts of modified emulsified asphalt evenly, spread them on the roadbed using a paver, and compact them to a designed thickness of 0.4 cm to obtain a flat base layer that is tightly bonded to the roadbed.

[0041] S2: Mix 28 parts of epoxy modified asphalt, 125 parts of aggregate (basalt crushed stone), 15 parts of mineral powder (limestone mineral powder), 14 parts of expanded perlite particles and 11 parts of porous ceramic particles in proportion, use a mixing equipment to fully mix them evenly, and then use a paver to lay them on the base layer obtained in step S1 and compact them to the designed thickness of 4 cm to obtain an intermediate functional layer.

[0042] S3: Fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, and matrix asphalt are mixed in a ratio of 2:3:5, and at the same time, 6% by weight of additives (3 parts of anti-stripping agent and 3 parts of anti-aging agent) and 9% by weight of modified titanium dioxide production waste residue are added. The mixture is thoroughly mixed using a mixing equipment, and then laid on the intermediate functional layer obtained in step S2 using a paver, compacted to a designed thickness of 2 cm, and finally paved to obtain the environmentally friendly asphalt pavement structure with high anti-skid performance.

[0043] Example 3

[0044] This example of an environmentally friendly, skid-resistant asphalt pavement structure comprises a base layer, an intermediate functional layer, and a surface layer, laid sequentially from bottom to top. The surface layer comprises fiber-modified waste asphalt, shape-memory polymer chemically modified waste asphalt, and base asphalt, all mixed in a mass ratio of 3:2:5. Additives comprise 7% of the total mass, and 8% of the total mass, derived from waste residue from modified titanium dioxide production. The additives consist of 4 parts by weight of polyethylene wax (an anti-stripping agent) and 3 parts of 2246 (an anti-aging agent). The base layer comprises the following raw materials in parts by weight: 28 parts polystyrene foam and 72 parts modified emulsified asphalt. The intermediate functional layer comprises the following raw materials in parts by weight: 32 parts epoxy-modified asphalt, 115 parts aggregate (basalt crushed stone), 17 parts mineral powder (limestone powder), 16 parts expanded perlite particles, and 9 parts porous ceramic particles.

[0045] The fiber-modified waste asphalt is the same as that in Example 1. The modified titanium dioxide production waste residue is the same as that in Example 1.

[0046] The preparation method for chemically modified waste asphalt with a shape memory polymer is as follows: after heating the waste asphalt to 120°C to soften it, the waste asphalt is treated with a 0.1 mol / L hydrogen peroxide solution at 80°C with ultrasonic-assisted stirring for 2 hours, followed by washing and drying. The resulting dry product is immersed in ethylene glycol at a mass ratio of 1:30 and dissolved for 10 hours to obtain a waste asphalt liquid. The waste asphalt liquid is then mixed and stirred evenly with 15% polyether polyol NJ-330 and 7% 1,4-adamantanediol, representing 15% by weight of the mixture. Next, 15% hexamethylene diisocyanate (HDI) and 0.7% dibutyltin dilaurate as a catalyst are added to the mixture. The mixture is stirred at 80°C for 2 hours, and then cooled to room temperature to obtain the shape memory polymer chemically modified waste asphalt.

[0047] This embodiment is a construction method of the above-mentioned environmentally friendly asphalt pavement structure with high anti-skid performance, which includes the following steps:

[0048] S1: Mix 28 parts of polystyrene foam and 72 parts of modified emulsified asphalt evenly, spread them on the roadbed using a paver, and compact them to a designed thickness of 0.4 cm to obtain a flat base layer that is tightly bonded to the roadbed.

[0049] S2: Mix 32 parts of epoxy modified asphalt, 115 parts of aggregate (basalt crushed stone), 17 parts of mineral powder (limestone mineral powder), 16 parts of expanded perlite particles and 9 parts of porous ceramic particles in proportion, use a mixing equipment to fully mix them evenly, and then use a paver to lay them on the base layer obtained in step S1 and compact them to the designed thickness of 4 cm to obtain an intermediate functional layer.

[0050] S3: Fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, and matrix asphalt are mixed in a ratio of 3:2:5, and at the same time, 7% by weight of additives (4 parts of anti-stripping agent and 3 parts of anti-aging agent) and 8% by weight of modified titanium dioxide production waste residue are added. The mixture is thoroughly mixed using a mixing device, and then laid on the intermediate functional layer obtained in step S2 using a paver, compacted to a designed thickness of 2 cm, and finally paved to obtain the environmentally friendly asphalt pavement structure with high anti-skid performance.

[0051] Comparative Example 1

[0052] The raw material composition and preparation steps of the environmentally friendly asphalt pavement structure with high anti-skid performance in this comparative example are basically the same as those in Example 1, except that no fiber-modified waste asphalt is added to the surface layer of this comparative example.

[0053] Comparative Example 2

[0054] The raw material composition and preparation steps of the environmentally friendly asphalt pavement structure with high anti-skid performance in this comparative example are basically the same as those in Example 1, except that shape memory polymer chemically modified waste asphalt is not added to the surface layer of this comparative example.

[0055] Comparative Example 3

[0056] The raw material composition and preparation steps of the environmentally friendly asphalt pavement structure with high anti-skid performance in this comparative example are basically the same as those in Example 1, except that no waste residue from the production of modified titanium dioxide is added to the surface layer of this comparative example.

[0057] The environmentally friendly asphalt pavement structures of Examples 1 to 3 and Comparative Examples 1 to 3 were subjected to performance tests, and the performance results are shown in Table 1:

[0058] For the skid resistance test, according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), a pendulum tester is placed on the road surface to be tested. The pendulum head is adjusted to ensure good contact with the road surface, ensuring that the swing angle and speed meet the standard requirements. Multiple tests (at least three) are performed, and the friction coefficient is recorded and the average value is calculated as the skid resistance index for the road section.

[0059] Abrasion resistance testing: According to the "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), standard-sized asphalt mixture specimens were placed in an abrasion tester. The speed was adjusted to 30 rpm and the abrasion time was set to 10 minutes. After starting the tester, the mass loss of the specimens was measured at the end of the test, and the wear rate was calculated based on this.

[0060] Durability testing: According to the "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), asphalt mixture specimens were placed in an aging chamber at a set temperature of 85°C ± 2°C and a humidity of 50% ± 5% for 72 hours. After aging, the specimens were removed for strength testing, and the residual strength ratio after aging was calculated.

[0061] Water stability testing: In accordance with the "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), asphalt mixture specimens were completely immersed in water for 48 hours. Immediately after immersion, strength testing was performed. By comparing the strength before and after immersion, the residual strength ratio was calculated to assess water stability.

[0062] Anti-stripping performance testing: In accordance with the "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), asphalt mixture specimens were placed in an anti-stripping testing machine with a loading force of 1000N and a loading time of 10 minutes to ensure compliance with standard requirements. After loading, the specimen surface was observed for spalling and the spalling rate was calculated.

[0063] Table 1 Performance test results

[0064]

[0065] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention as claimed.

Claims

1. An environmentally friendly asphalt pavement structure with high anti-skid performance, characterized in that: The asphalt pavement structure includes a base layer, an intermediate functional layer and a surface layer laid in sequence from bottom to top; wherein the surface layer includes fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, matrix asphalt and additives compounded in proportion; the preparation method of the shape memory polymer chemically modified waste asphalt is as follows: the waste asphalt is subjected to end hydroxyl modification treatment to obtain waste asphalt liquid, and then polyether polyol and adamantane diol are added and stirred evenly, and then diisocyanate and a catalyst are added, and the reaction is stirred at 80°C for 2 hours to obtain the shape memory polymer chemically modified waste asphalt. Memory polymer chemically modified waste asphalt; the preparation method of the fiber-modified waste asphalt is as follows: first, the fiber is oxidized with hydrogen peroxide, and then oxidized with sodium periodate to obtain surface carboxylated fiber; at the same time, the waste asphalt is soaked in an acidic solution for a period of time; finally, the modified carboxylated fiber and the waste asphalt are added to a container together, and a mixed solution of 1H,1H,9H,9H-perfluoro-1,9-nonanediol and ethylene glycol is added, and the mixture is stirred and reacted at 80°C for 2 hours to obtain the fiber-modified waste asphalt.

2. The environmentally friendly asphalt pavement structure with high anti-skid performance according to claim 1, characterized in that: The base layer comprises the following raw materials in parts by weight: 20 to 30 parts of polystyrene foam and 70 to 80 parts of modified emulsified asphalt.

3. The environmentally friendly asphalt pavement structure with high anti-skid performance according to claim 1, characterized in that: The intermediate functional layer comprises the following raw materials in parts by weight: 25 to 35 parts of epoxy modified asphalt, 110 to 130 parts of aggregate, 14 to 18 parts of mineral powder, 12 to 18 parts of expanded perlite particles and 8 to 12 parts of porous ceramic particles.

4. The environmentally friendly asphalt pavement structure with high anti-skid performance according to claim 1, characterized in that: The polyether polyol is at least one of polyether polyol NJ-8307, polyether polyol NJ-6209, polyether polyol NJ-330 and polyether polyol NJ-220.

5. The environmentally friendly asphalt pavement structure with high anti-skid performance according to claim 1, characterized in that: The adamantane diol is at least one of 1,3-adamantanedimethanol, 4-methyladamantane-1,4-diol, and 1,4-adamantanediol.

6. The environmentally friendly asphalt pavement structure with high skid resistance according to claim 1, characterized in that: The diisocyanate is at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

7. The environmentally friendly asphalt pavement structure with high skid resistance according to claim 1, characterized in that: The surface layer raw materials are also added with waste residue from the production of modified titanium dioxide.

8. A construction method of an environmentally friendly asphalt pavement structure with high skid resistance according to any one of claims 1 to 7, characterized in that: The construction method comprises the following steps: S1: Mix 20-30 parts of polystyrene foam and 70-80 parts of modified emulsified asphalt evenly, and spread them on the roadbed using a paver to obtain a smooth base layer that is tightly bonded to the roadbed. S2: 25-35 parts of epoxy modified asphalt, 110-130 parts of aggregate, 14-18 parts of mineral powder, 12-18 parts of expanded perlite particles, and 8-12 parts of porous ceramic particles are mixed in proportion, mixed thoroughly and evenly using a mixing device, and then paved on the base layer obtained in step S1 using a paver to obtain an intermediate functional layer; S3: Fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, and matrix asphalt are mixed in a ratio of 1:1:2, and appropriate amounts of additives and modified titanium dioxide production waste residue are added. The mixture is fully mixed using a mixing device, and then a paver is used to lay the mixture on the intermediate functional layer obtained in step S2, and finally the environmentally friendly asphalt pavement structure with high anti-skid performance is paved.

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