Environment-friendly asphalt pavement structure with high skid resistance and construction method thereof

Abstract

The invention discloses a high-skid-resistance environment-friendly asphalt pavement structure. The high-skid-resistance environment-friendly asphalt pavement structure comprises a base layer, a middle functional layer and a surface layer which are sequentially laid from bottom to top, wherein the surface layer comprises fiber modified waste asphalt, shape memory polymer chemical modified waste asphalt, matrix asphalt and auxiliaries which are compounded in proportion. According to the asphalt pavement structure, the skid resistance of the pavement is remarkably improved, the wear resistance and durability of the pavement are enhanced, the asphalt pavement structure has excellent heat insulation, noise reduction and drainage performance, meanwhile, good construction performance and environmental adaptability are guaranteed, the overall comprehensive performance is excellent, and the application prospect is wide. And the requirements of long-term durability and stability under different weather conditions and traffic flows can be met. The invention further discloses a construction method of the environment-friendly asphalt pavement structure with the high skid resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt pavements, and particularly to an environmentally friendly asphalt pavement structure with high anti-slip performance and its construction method. Background Art

[0002] Asphalt pavements are widely used in road construction due to their good construction performance and economy. However, there are some problems in the use of traditional asphalt pavements. Firstly, the anti-slip performance of asphalt pavements will decline due to long-term use. Especially in wet conditions, the formation of a water film will further reduce the friction between the tire and the road surface, increasing the risk of skidding. Secondly, asphalt materials will age under the long-term action of natural environmental factors (such as ultraviolet rays, oxygen, and temperature changes), resulting in hardening, embrittlement, and loss of elasticity, which will further affect the adhesion of aggregates, accelerate aggregate shedding, and reduce the anti-slip performance of the road surface. In addition, moisture and chemical substances (such as acid rain and oil stains) in the environment will corrode asphalt and aggregates, further weakening the structural performance of the road surface. Construction quality is also an important factor affecting the performance of asphalt pavements. Improper selection of aggregates, defects in construction technology, and improper temperature control will all lead to insufficient flatness and density of the road surface, affecting its anti-slip performance and durability. The frequent action of traffic loads, especially the rolling of heavy vehicles, will accelerate road surface wear, resulting in aggregate shedding and texture disappearance. These factors work together, making traditional asphalt pavements insufficient in anti-slip performance, wear resistance, durability, and environmental adaptability, and improvement is needed to meet the needs of modern transportation. Summary of the Invention

[0003] In view of the above deficiencies of the prior art, the present invention provides an environmentally friendly asphalt pavement structure with high anti-slip performance to solve the deficiencies of traditional asphalt pavements in anti-slip performance, wear resistance, durability, and environmental adaptability, especially the technical problems such as the decline of anti-slip performance in wet conditions, short service life, and environmental unfriendliness.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows: An environmentally friendly asphalt pavement structure with high anti-slip performance, 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.

[0005] As a preferred technical solution, the base layer includes the following raw materials in parts by weight: 20 - 30 parts of polystyrene foam and 70 - 80 parts of modified emulsified asphalt.

[0006] As a preferred technical solution, the intermediate functional layer comprises raw materials in the following parts by weight: 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.

[0007] As a preferred technical solution, the preparation method of the fiber-modified waste asphalt is as follows: First, the fiber is treated with hydrogen peroxide oxidation, 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 into 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 fiber-modified waste asphalt. The preparation method of the fiber-modified waste asphalt in the present invention significantly improves the performance of the waste asphalt through a series of chemical treatments. First, the fiber is surface carboxylated after being treated with hydrogen peroxide oxidation and sodium periodate, which increases the active sites of the fiber and enables 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. Third, the addition of 1H,1H,9H,9H-perfluoro-1,9-nonanediol imparts good hydrophobic properties to the modified asphalt, reducing the negative impact of moisture on the road surface performance. Finally, the participation of ethylene glycol promotes the uniformity of the reaction system and ensures the efficient progress of the modification process. These technical means work together to make the fiber-modified waste asphalt not only have excellent anti-slip performance and wear resistance, but also have good hydrophobicity and chemical stability, effectively extending the service life of the road surface and improving its stability under harsh environmental conditions.

[0008] As a preferred technical solution, 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, then polyether polyol and adamantane diol are added and stirred evenly, and then diisocyanate and a catalyst are added. The mixture is stirred and reacted at 80 °C for 2 hours to obtain the shape memory polymer chemically modified waste asphalt. In the preparation method of the shape memory polymer chemically modified waste asphalt in the present invention, through the end - hydroxyl modification treatment, the waste asphalt liquid obtains higher reaction activity, laying a 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 endows it with a shape memory function, enabling it to return to a preset shape when the temperature changes, effectively reducing road surface cracks caused by temperature changes. The use of diisocyanate and a catalyst promotes the progress of the polymerization reaction, forming a shape memory polymer network structure with good mechanical properties and chemical stability. The combined action of these technical means makes the shape memory polymer chemically modified waste asphalt not only have excellent crack resistance and shape recovery ability, but also have good wear resistance and anti - skid performance, significantly improving the durability and stability of the road surface, effectively extending the service life of the road surface, and reducing the maintenance cost.

[0009] 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.

[0010] As a preferred technical solution, the adamantane diol is at least one of 1,3 - adamantane dimethanol, 4 - methyladamantane - 1,4 - diol, and 1,4 - adamantane diol.

[0011] As a preferred technical solution, the diisocyanate is at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

[0012] As a preferred technical solution, waste residue from the production of modified titanium dioxide is also added to the surface layer raw materials. By introducing the waste residue from the production of modified titanium dioxide into the surface layer raw materials in the present invention, the recycling of resources is achieved, and at the same time, the comprehensive performance of the surface layer is significantly improved. The main component of the waste residue from the production of titanium dioxide is titanium dioxide (TiO2), and this substance plays important roles in many aspects in the surface layer. First of all, titanium dioxide has a high refractive index and good optical properties, which can improve the reflectivity of the road surface, thereby enhancing the visibility of the road surface at night or under low light conditions and contributing to improving driving safety. Secondly, titanium dioxide has excellent chemical stability and weather resistance, which can enhance the anti-aging performance of the surface layer and enable it to maintain good performance even when exposed to the natural environment for a long time. In addition, titanium dioxide has a relatively high hardness, which can improve the wear resistance and anti-skid performance of the road surface, reduce the wear of the road surface during vehicle driving, and extend the service life of the road surface. At the same time, its surface activity can improve the adhesion between asphalt and aggregates and enhance the overall stability of the surface layer. Generally speaking, adding waste residue from the production of modified titanium dioxide not only optimizes the anti-skid, 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.

[0013] As a preferred technical solution, the auxiliary agent is composed of an anti-stripping agent and an anti-aging agent.

[0014] Another aspect of the present invention is to provide a construction method for an environmentally friendly asphalt pavement structure with high anti-skid performance as described above. The construction method includes the following steps: S1: Mix 20-30 parts of polystyrene foam with 70-80 parts of modified emulsified asphalt evenly, and use a paver to lay it on the roadbed to obtain a flat and tightly bonded base layer with the roadbed. S2: Mix 25-35 parts of epoxy-modified asphalt, 110-130 parts of aggregates, 14-18 parts of mineral powder, 12-18 parts of expanded perlite particles and 8-12 parts of porous ceramic particles in proportion. After fully mixing evenly with a mixing device, use a paver to lay it on the base layer obtained in step S1 to obtain an intermediate functional layer. S3: Mix fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, and matrix asphalt in a ratio of 1:1:2. At the same time, add an appropriate amount of auxiliary agent and waste residue from the production of modified titanium dioxide, and fully mix evenly with a mixing device. Then use a paver to lay it on the intermediate functional layer obtained in step S2, and finally lay the environmentally friendly asphalt pavement structure with high anti-skid performance.

[0015] The base layer of the present invention serves as the foundation of the entire asphalt pavement structure, mainly playing the roles of support and heat insulation. By using a composite material of polystyrene foam and modified emulsified asphalt, the base layer not only provides good heat insulation performance, reducing the downward transfer of heat, but also enhances the overall structural stability. This heat insulation performance helps to reduce the impact of temperature changes on the road surface, delays the aging process of asphalt, and thus indirectly improves the anti-skid performance of the road surface. In addition, the flatness of the base layer and its tight bonding with the roadbed ensure a good laying foundation for the intermediate functional layer and the surface layer, providing guarantee for the stability and durability of the entire pavement structure.

[0016] The intermediate functional layer of the present invention, through its specific material ratio and structural design, mainly plays the roles of enhancing the overall performance of the road surface and providing specific functions. The use of epoxy-modified asphalt enhances the chemical stability and mechanical properties of asphalt, delays the aging process of the material, and at the same time improves the bonding force with aggregates. As the main aggregate, the aggregates provide high strength and good wear resistance, enhancing the bearing capacity and anti-skid performance of the road surface. Mineral powder fills the voids between the aggregates, improves the density and stability of the mixture, and further enhances the anti-cracking performance and durability of the road surface. 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 road surface, reduces the water film formed by rainwater on the road surface, and thus improves the friction between the tire and the road surface. In addition, the high modulus and shear resistance of the intermediate functional layer can effectively cope with traffic loads, reduce aggregate shedding and road surface wear, and further improve the anti-skid performance and service life of the road surface.

[0017] The surface layer of the present invention is the part directly in contact with the 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 micro-texture 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 aggregates under the action of vehicle loads and reduce the surface smoothing phenomenon. The addition of matrix asphalt ensures the flexibility and anti-cracking performance 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 influence of rainwater, enhances the interfacial bonding force between asphalt and aggregates, and thus significantly improves the anti-skid performance and durability of the road surface.

[0018] The beneficial effects of the present invention: The environmentally friendly asphalt pavement structure with high anti-skid performance of the present invention, by respectively adopting the innovative combination of polystyrene foam and modified emulsified asphalt composite material, various modified asphalts and specific additives in the base layer, intermediate functional layer and surface layer, not only significantly improves the anti-skid performance of the pavement, but also realizes the optimization of multiple functions such as heat insulation, noise reduction, drainage and wear resistance. 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, endows the pavement with high modulus and shape recovery ability, and enables it to maintain the edges and corners of the aggregate under the action of vehicle load and reduce the surface smoothing phenomenon. This design not only enhances the overall stability and durability of the pavement, but also maintains good construction performance and environmental adaptability, helps to reduce the pavement maintenance cost and improve the driving safety.

[0019] Generally speaking, 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 climate conditions and traffic flows. Specific embodiments

[0020] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variants.

[0021] Example 1 The environmentally friendly asphalt pavement structure with high anti-skid performance in this embodiment 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, and matrix asphalt compounded in a mass ratio of 1:1:2, as well as an additive added in an amount of 5% of the total mass and modified titanium dioxide production waste residue added in an amount of 10% of the total mass. The additive is composed of 3 parts by weight of anti-stripping agent polyethylene wax and 2 parts by weight of anti-aging agent 2246. The base layer includes the following raw materials in parts by weight: 25 parts of polystyrene foam and 75 parts of modified emulsified asphalt. The intermediate functional layer includes the following raw materials in parts by weight: 30 parts of epoxy modified asphalt, 120 parts of aggregate (basalt gravel), 16 parts of mineral powder (limestone powder), 15 parts of expanded perlite particles and 10 parts of porous ceramic particles.

[0022] The preparation method of the fiber-modified waste asphalt is as follows: First, the fiber material (such as polypropylene fiber) is treated in a 30% hydrogen peroxide solution at 60 °C for 2 hours, and then washed and dried with deionized water to introduce active groups such as hydroxyl and carboxyl groups. Then, 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, it is washed and dried. At the same time, the waste asphalt is heated to 120 °C to soften it, and then soaked in a 0.1 mol / L hydrochloric acid solution for 1 hour to remove impurities and activate the surface, and then washed and dried. Finally, the carboxylated fiber is mixed with the waste asphalt at a weight ratio of 1:10, and a mixed solution of 5% 1H,1H,9H,9H-perfluoro-1,9-nonanediol and 5% ethylene glycol based on the total weight of the mixture is added, and stirred and reacted at 80 °C for 2 hours. After cooling to room temperature, the fiber-modified waste asphalt is obtained.

[0023] The preparation method of the shape memory polymer chemically modified waste asphalt is as follows: After heating the waste asphalt to 120 °C to soften it, it is ultrasonically assisted and stirred in a 0.1 mol / L hydrogen peroxide solution at 80 °C for 2 hours, and then washed and dried; the obtained dried product is impregnated in ethylene glycol at a mass ratio of 1:30 and dissolved for 10 h to obtain a waste asphalt solution. Then, the waste asphalt solution is mixed and stirred evenly with 10% polyether polyol NJ-8307 and 5% 1,3-adamantanediol based on its weight, and then 10% isophorone diisocyanate (IPDI) and 0.5% catalyst dibutyltin dilaurate based on the total weight of the mixture are added, and stirred and reacted at 80 °C for 2 hours. After cooling to room temperature, the shape memory polymer chemically modified waste asphalt is obtained.

[0024] The preparation method of the modified titanium dioxide production waste residue is as follows: After washing the titanium dioxide production waste residue with clean water, it is screened through 0.075 mm and 2 mm sieves; then ferromagnetic impurities are removed by a magnetic separation device, and then the waste residue and silane coupling agent (KH-540) with a mass ratio of 100:1 are added to a tetrahydrofuran solvent (mass-to-volume ratio of 1:2) and mixed, and stirred and reacted at 80 °C for 2 hours and then dried; finally, the surface-modified waste residue is calcined at 600 °C for 2 hours.

[0025] The construction method of the environmentally friendly asphalt pavement structure with high anti-slip performance in this embodiment is as follows: S1: Mix 25 parts of polystyrene foam and 75 parts of modified emulsified asphalt evenly, and lay it on the roadbed by a paver, and compact it to a designed thickness of 0.4 cm to obtain a flat and tightly combined base layer with the roadbed.

[0026] S2: Mix 30 parts of epoxy-modified asphalt, 120 parts of aggregate (basalt gravel), 16 parts of mineral powder (limestone powder), 15 parts of expanded perlite particles and 10 parts of porous ceramic particles in proportion. After fully mixing them evenly with a mixing device, 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 the intermediate functional layer.

[0027] S3: Mix fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, and matrix asphalt in a ratio of 1:1:2. At the same time, add 5% of the total mass of additives (3 parts of anti-stripping agent and 2 parts of anti-aging agent) and 10% of the total mass of modified titanium dioxide production waste residue. Use a mixing device to fully mix them evenly, and then use a paver to lay them on the intermediate functional layer obtained in step S2, and compact them to the designed thickness of 2 cm to finally lay the environmentally friendly asphalt pavement structure with high anti-skid performance.

[0028] Example 2 The environmentally friendly asphalt pavement structure with high anti-skid performance in this example includes a base layer, an intermediate functional layer, and a surface layer laid in sequence from bottom to top. Among them, the surface layer includes fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, and matrix asphalt compounded in a mass ratio of 2:3:5, as well as additives added at 6% of the total mass and modified titanium dioxide production waste residue added at 9% of the total mass. The additive is composed of 3 parts by weight of anti-stripping agent polyethylene wax and 3 parts by weight of anti-aging agent 2246. The base layer includes the following raw materials in parts by weight: 22 parts of polystyrene foam and 78 parts of modified emulsified asphalt. The intermediate functional layer includes the following raw materials in parts by weight: 28 parts of epoxy-modified asphalt, 125 parts of aggregate (basalt gravel), 15 parts of mineral powder (limestone powder), 14 parts of expanded perlite particles and 11 parts of porous ceramic particles.

[0029] 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.

[0030] The preparation method of the shape memory polymer chemically modified waste asphalt is as follows: Heat the waste asphalt to 120 °C to soften it, and then use 0.1 mol / L hydrogen peroxide solution to perform ultrasonic-assisted stirring treatment at 80 °C for 2 hours, followed by washing and drying; Immerse the obtained dried product in ethylene glycol at a mass ratio of 1:30 and dissolve it for 10 h to obtain a waste asphalt solution. Then, mix the waste asphalt solution evenly with 12% of its weight of polyether polyol NJ-6209 and 6% of 4-methyladamantane-1,4-diol, and then add 12% of the total weight of the mixture of toluene diisocyanate (TDI) and 0.6% of the catalyst dibutyltin dilaurate, and stir and react at 80 °C for 2 hours. After cooling to room temperature, the shape memory polymer chemically modified waste asphalt is obtained.

[0031] The construction method of the environmentally friendly asphalt pavement structure with high anti-skid performance in this embodiment is as follows: S1: Mix 22 parts of polystyrene foam and 78 parts of modified emulsified asphalt evenly, and lay it on the roadbed with a paver, then compact it to the designed thickness of 0.4 cm to obtain a flat and tightly combined base layer with the roadbed.

[0032] S2: Mix 28 parts of epoxy modified asphalt, 125 parts of aggregate (basalt gravel), 15 parts of mineral powder (limestone powder), 14 parts of expanded perlite particles and 11 parts of porous ceramic particles in proportion. After fully mixing evenly with a mixing device, lay it on the base layer obtained in step S1 with a paver, and compact it to the designed thickness of 4 cm to obtain an intermediate functional layer.

[0033] S3: Mix fiber modified waste asphalt, shape memory polymer chemically modified waste asphalt, and matrix asphalt in a ratio of 2:3:5. At the same time, add 6% of the total mass of additives (3 parts of anti-stripping agent and 3 parts of anti-aging agent) and 9% of the total mass of modified titanium dioxide production waste residue. After fully mixing evenly with a mixing device, then lay it on the intermediate functional layer obtained in step S2 with a paver, and compact it to the designed thickness of 2 cm to finally lay the environmentally friendly asphalt pavement structure with high anti-skid performance.

[0034] Example 3 The environmentally friendly asphalt pavement structure with high anti-skid performance in this embodiment 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, and matrix asphalt compounded in a mass ratio of 3:2:5, as well as 7% of the total mass of additives and 8% of the total mass of modified titanium dioxide production waste residue added. The additive is composed of 4 parts by weight of anti-stripping agent polyethylene wax and 3 parts of anti-aging agent 2246. The base layer includes the following raw materials in parts by weight: 28 parts of polystyrene foam and 72 parts of modified emulsified asphalt. The intermediate functional layer includes the following raw materials in parts by weight: 32 parts of epoxy modified asphalt, 115 parts of aggregate (basalt gravel), 17 parts of mineral powder (limestone powder), 16 parts of expanded perlite particles and 9 parts of porous ceramic particles.

[0035] 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.

[0036] The preparation method of the shape memory polymer chemically modified waste asphalt is as follows: After heating the waste asphalt to 120 °C to soften it, it is ultrasonically assisted and stirred with 0.1 mol / L hydrogen peroxide solution at 80 °C for 2 hours and then washed and dried; the obtained dried product is impregnated in ethylene glycol according to a mass ratio of 1:30 and dissolved for 10 h to obtain a waste asphalt solution. Then, the waste asphalt solution is mixed and stirred evenly with 15% of polyether polyol NJ-330 and 7% of 1,4-adamantanediol by weight, and then 15% of hexamethylene diisocyanate (HDI) and 0.7% of dibutyltin dilaurate as a catalyst are added, and the mixture is stirred and reacted at 80 °C for 2 hours. After cooling to room temperature, the shape memory polymer chemically modified waste asphalt is obtained.

[0037] The construction method of the environmentally friendly asphalt pavement structure with high anti-skid performance in this embodiment is as follows: S1: Mix 28 parts of polystyrene foam and 72 parts of modified emulsified asphalt evenly, and lay them on the roadbed by a paver, and compact them to a designed thickness of 0.4 cm to obtain a flat and tightly combined base layer with the roadbed.

[0038] S2: Mix 32 parts of epoxy modified asphalt, 115 parts of aggregate (basalt gravel), 17 parts of mineral powder (limestone powder), 16 parts of expanded perlite particles and 9 parts of porous ceramic particles in proportion, and use a mixing device to mix them evenly, and then lay them on the base layer obtained in step S1 by a paver, and compact them to a designed thickness of 4 cm to obtain an intermediate functional layer.

[0039] S3: Mix fiber modified waste asphalt, shape memory polymer chemically modified waste asphalt, and matrix asphalt in a ratio of 3:2:5, and at the same time add 7% of the total mass of additives (4 parts of anti-stripping agent and 3 parts of anti-aging agent) and 8% of the total mass of modified titanium dioxide production waste residue, and use a mixing device to mix them evenly, and then lay them on the intermediate functional layer obtained in step S2 by a paver, and compact them to a designed thickness of 2 cm, and finally lay the environmentally friendly asphalt pavement structure with high anti-skid performance.

[0040] Comparative Example 1 The environmentally friendly asphalt pavement structure with high anti-skid performance in this comparative example has the same raw material composition and preparation steps as those in Example 1, except that fiber modified waste asphalt is not added to the surface layer of this comparative example.

[0041] Comparative Example 2 The environmentally friendly asphalt pavement structure with high anti-skid performance in this comparative example has the same raw material composition and preparation steps 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.

[0042] Comparative Example 3 The environmentally friendly asphalt pavement structure with high anti-skid performance in this comparative example has the same raw material composition and preparation steps as those in Example 1, except that modified titanium dioxide production waste residue is not added to the surface layer in this comparative example.

[0043] Perform performance tests on the environmentally friendly asphalt pavement structures of Examples 1 to 3 and Comparative Examples 1 to 3, and the performance results are shown in Table 1: Among them, for the anti-skid performance test: According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), place the pendulum tester on the road surface to be tested, adjust the pendulum head to make good contact with the road surface, and ensure that the swing angle and speed meet the standard requirements. Conduct multiple tests (at least 3 times), record the friction coefficient each time and calculate the average value, which is used as the anti-skid performance index of this section of the road.

[0044] For the wear resistance test: According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), place asphalt mixture specimens of standard size in the abrasion testing machine, adjust the rotation speed of the testing machine to 30 revolutions per minute, and the abrasion time is 10 minutes. After starting the testing machine, weigh the mass loss of the specimens at the end of the test, and calculate the abrasion rate accordingly.

[0045] For the durability test: According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), place the asphalt mixture specimens in the aging test chamber, set the temperature to 85°C ± 2°C, the humidity to 50% ± 5%, and age for 72 hours continuously. After the aging treatment is completed, take out the specimens for strength testing and calculate the residual strength ratio after aging.

[0046] For the water stability test: According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), completely immerse the asphalt mixture specimens in water for 48 hours. After the immersion ends, immediately conduct strength testing, and calculate the residual strength ratio by comparing the strength before and after immersion to evaluate the water stability.

[0047] For the anti-stripping performance test: According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), place the asphalt mixture specimens in the anti-stripping testing machine, set the loading force to 1000 N, and the loading time to 10 minutes to meet the standard requirements. After the loading is completed, observe the stripping situation on the surface of the specimens and calculate the stripping rate.

[0048] Table 1 Performance test results

[0049] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all these changes and improvements fall within the scope of the present invention 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; among them, the surface layer includes fiber-modified waste asphalt, shape memory polymer chemically modified waste asphalt, matrix asphalt, and additives compounded in proportion.

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

4. The environmentally friendly asphalt pavement structure with high anti-skid performance according to claim 1, characterized in that, The preparation method of the fiber-modified waste asphalt is as follows: First, the fiber is oxidized by hydrogen peroxide, and then oxidized by 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 into a container together, and a mixed solution of 1H,1H,9H,9H-perfluoro-1,9-nonanediol and ethylene glycol is added, and stirred and reacted at 80°C for 2 hours to obtain fiber-modified waste asphalt.

5. The environmentally friendly asphalt pavement structure with high anti-skid performance according to claim 1, characterized in that, The preparation method of the shape memory polymer chemically modified waste asphalt is as follows: The waste asphalt is subjected to terminal hydroxyl modification treatment to obtain a waste asphalt liquid, then polyether polyol and adamantane diol are added and stirred evenly, and then diisocyanate and a catalyst are added, and stirred and reacted at 80°C for 2 hours to obtain shape memory polymer chemically modified waste asphalt.

6. The environmentally friendly asphalt pavement structure with high anti-slip performance according to claim 5, 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.

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

8. The environmentally friendly asphalt pavement structure with high anti-slip performance according to claim 5, characterized in that, The diisocyanate is at least one of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

9. The environmentally friendly asphalt pavement structure with high anti-skid performance according to claim 1, characterized in that, Modified titanium dioxide production waste residue is also added to the raw materials of the surface layer.

10. A construction method for an environment-friendly asphalt pavement structure with high anti-slip performance as described in any one of claims 1 to 9, characterized in that, The construction method includes the following steps: S1: Mix 20 - 30 parts of polystyrene foam with 70 - 80 parts of modified emulsified asphalt evenly, and lay it on the roadbed with a paver to obtain a flat and tightly combined base layer with the roadbed. S2: Mix 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 in proportion, and use a mixing device to mix them evenly, and then lay it on the base layer obtained in step S1 with a paver to obtain an intermediate functional layer. S3: Mix the fiber-modified waste asphalt, the shape memory polymer chemically modified waste asphalt, and the matrix asphalt in a ratio of 1:1:2, and at the same time add an appropriate amount of additives and modified titanium dioxide production waste residue, and use a mixing device to mix them evenly, and then lay it on the intermediate functional layer obtained in step S2 with a paver to finally lay the environmentally friendly asphalt pavement structure with high anti-slip performance.

Images