Method for preparing environment-friendly high-pervious pavement material from solid waste by comprehensive utilization

Abstract

The application discloses a kind of solid waste comprehensive utilization low-cost preparation environment-friendly high-permeable pavement material method, comprising the following steps: matrix asphalt and mineral oil are mixed and heated, waste rubber particles are added, first stirring is mixed, temperature is raised, second stirring is mixed, finally temperature is reduced, third stirring is mixed, and asphalt regenerator is obtained;After heating, add asphalt regenerator to aged asphalt, stir and mix, then cool to room temperature, and obtain regenerated asphalt mixture;Cement, regenerated asphalt mixture, waste glass, granulated blast furnace slag, silica fume, pool ash, basalt fiber are added to mixer and stirred to obtain mixture;Water reducing agent and water are mixed, then EVA emulsion is added, continue to stir, finally add mixture, stir and mix, then place in mold for molding, then demold and cure, and obtain solid waste comprehensive utilization environment-friendly.The pavement material prepared by the application not only has good mechanical properties, but also has good water permeability and low preparation cost.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a method for preparing environmentally friendly, highly permeable pavement materials at low cost through comprehensive utilization of solid waste. Background Technology

[0002] With the acceleration of urbanization, urban drainage systems are bearing increasingly heavy loads. Often during heavy rainstorms, sudden situations prevent drainage facilities from draining water in time, leading to urban flooding and traffic congestion, significantly impacting cities. Therefore, an efficient drainage method is needed to solve this problem, and permeable pavement materials were proposed to address this issue.

[0003] Traditional road materials are mainly composed of cement, asphalt, and effective aggregates. These materials require high volumetric precision and density during road construction, making drainage difficult and causing serious drainage problems. Permeable pavement materials, on the other hand, utilize a low-density microporous structure and special manufacturing processes, allowing rainwater to seep directly into the ground through the road surface. While ensuring road safety, they transform the road into a "sponge," achieving excellent drainage and permeability. This material not only effectively reduces waterlogging and pollution on urban roads during rainy weather, alleviating drainage pressure in urban areas, but also improves the urban ecological environment by lowering surface temperature and reducing ultraviolet radiation through shading. The existence of permeable pavement materials not only improves the urban environment but also significantly enhances road safety. After road completion, the extra layer of microporous structure in permeable pavement results in a higher surface friction coefficient and better anti-skid properties. This not only reduces slippery roads in rainy weather but also lowers traffic accident rates, ensuring the safety of people's travel.

[0004] While permeable pavements are popular in urban construction, several challenges remain: First, the reduced density of permeable materials may decrease their strength and durability, requiring further research and development and practical experience. Second, in situations of heavy rainfall, related mitigation measures are not yet fully developed, potentially limiting their ability to handle extreme precipitation. Furthermore, the high cost of permeable pavements prevents their widespread adoption in all urban and road environments. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a low-cost method for preparing environmentally friendly, highly permeable pavement materials by comprehensively utilizing solid waste, addressing the shortcomings of existing technologies. This invention mixes mineral oil, waste rubber particles, and base asphalt to prepare an asphalt regenerator, and regenerates aged asphalt under certain conditions. The resulting recycled asphalt mixture is used in the preparation of permeable pavement materials. This invention also uses pool ash to replace part of the silica fume in the preparation of permeable pavement materials. The pavement materials prepared by this invention not only have good mechanical properties but also good permeability and low preparation cost.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A method for preparing environmentally friendly, highly permeable pavement materials at low cost through comprehensive utilization of solid waste includes the following steps:

[0008] (1) Mix the base asphalt and mineral oil and heat them. Then add waste rubber particles, stir and mix for the first time, then heat up and stir and mix for the second time, and finally cool down and stir and mix for the third time to obtain asphalt recycling agent.

[0009] (2) After heating the aged asphalt, add the asphalt recycling agent prepared above, stir and mix, and then cool to room temperature to obtain recycled asphalt mixture;

[0010] (3) Add cement, recycled asphalt mixture, waste glass, granulated blast furnace slag, silica fume, pool ash, and basalt fiber into a mixer and stir to obtain a mixture;

[0011] (4) Mix the water-reducing agent and water evenly, then add EVA emulsion and continue stirring. Finally, add the mixture prepared above, stir and mix, place it in a mold to form, then demold and cure to obtain a solid waste comprehensive utilization environmentally friendly high permeable pavement material.

[0012] As a preferred embodiment of the above technical solution, in step (1), the base asphalt is SBS modified asphalt, the waste rubber particles are obtained by mechanical grinding of waste tires, and the average particle size is 2-3 mm. The flash point of the mineral oil is 240℃, and the Brookfield viscosity (60℃) is 441.2 mPa·s.

[0013] As a preferred embodiment of the above technical solution, in step (1), the temperature of the mixing and heating treatment is 140-150℃ and the time is 10-20 min; the temperature of the first mixing is 150℃ and the stirring speed is 1000-1200 rpm; the stirring time is 15-20 min; the temperature of the second mixing is 160℃ and the stirring speed is 4000-4500 rpm; the stirring time is 30-40 min; the temperature of the third mixing is 150℃ and the stirring speed is 500-800 rpm; the stirring time is 20-30 min.

[0014] As a preferred embodiment of the above technical solution, in step (1), the mass ratio of the matrix asphalt, mineral oil, and waste rubber particles is (4-5):(5-6):0.3.

[0015] As a preferred embodiment of the above technical solution, in step (2), the mass ratio of the aged asphalt to the asphalt recycling agent is 1:(0.03-0.05).

[0016] As a preferred embodiment of the above technical solution, in step (2), the temperature of the stirring and mixing process is 160°C, the stirring speed is 500-600 rpm, and the stirring time is 30-50 min.

[0017] As a preferred embodiment of the above technical solution, in step (3), the particle size of the waste glass is 4-5 mm.

[0018] As a preferred embodiment of the above technical solution, in step (3), the amount of each component is in parts by weight as follows: 90-100 parts of cement, 5-10 parts of recycled asphalt mixture, 60-120 parts of granulated blast furnace slag, 10-20 parts of waste glass, 15-25 parts of silica fume, 10-20 parts of pool ash, and 10-20 parts of basalt fiber.

[0019] As a preferred embodiment of the above technical solution, in step (4), the water-reducing agent is a polycarboxylate high-efficiency water-reducing agent; the solid content of the EVA emulsion is 55%, and its viscosity (25°C) is 4000 mPa·s; the pool ash comprises pool ash with an average particle size of 100 μm and pool ash with an average particle size of 50 μm, with a mass ratio of 2:1.

[0020] As a preferred embodiment of the above technical solution, in step (4), the mass ratio of the water-reducing agent, water, EVA emulsion, and mixture is (1-2):(30-40):(10-20):300.

[0021] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] This invention mixes base asphalt, mineral oil, and waste rubber granules in a specific ratio under certain conditions to obtain an asphalt rejuvenator. When used for the regeneration of aged asphalt, the mineral oil primarily improves the material's fluidity, reduces viscosity and adhesion, and also helps increase the asphalt's elastic modulus and improve its aging resistance. Waste rubber granules increase the material's strength and durability, while also improving the pavement's anti-skid and noise reduction effects. They can also reduce pavement temperature by absorbing solar radiation, thus mitigating damage caused by thermal expansion and contraction. SBS-modified asphalt increases the asphalt's adhesion and elasticity, improving the pavement's adaptability to temperature changes and traffic loads. SBS-modified asphalt also improves pavement durability and crack resistance, extending road service life. Furthermore, SBS-modified asphalt increases the asphalt's flexible modulus, improving the material's flexibility and brittleness resistance. This invention uses a self-made asphalt rejuvenator to modify aged asphalt and applies it to the preparation of permeable pavement materials. This reduces waste generation, meeting environmental protection requirements, while also improving the sustainability and resource utilization efficiency of road materials and lowering the preparation cost of permeable pavement materials.

[0023] This invention utilizes waste glass in the preparation of permeable pavement materials. When mixed with cement and recycled asphalt, the strength and stability of the pavement material are improved. Furthermore, waste glass possesses a certain degree of porosity and permeability; adding an appropriate amount of waste glass particles allows a complex porous structure to gradually form on the asphalt pavement surface, enhancing the material's permeability. In addition, the addition of waste glass increases the surface roughness of the pavement material, thereby reducing noise from passing vehicles and improving grip and anti-skid performance. Since waste glass is a type of waste material, it is difficult to degrade and dispose of naturally. Utilizing waste glass to prepare permeable pavement materials allows for resource reuse, reduces waste generation, and aligns with the concept of sustainable development.

[0024] This invention uses pond ash to replace part of the silica fume in permeable pavement materials. Pond ash is an industrial byproduct, mainly containing calcium oxide and magnesium oxide, and its main function is to improve the mechanical properties, durability, and stability of permeable pavement materials. First, the highly reactive micropowdered pond ash can promote the hardening reaction of cement in permeable pavement materials, enhancing the strength and durability of the entire concrete structure. Second, pond ash can fill the micropores in the material, improving the density and impermeability of the permeable pavement material, thereby ensuring the permeability of the pavement. By effectively controlling the dosage of each component, this invention produces a pavement material that not only has high strength but also excellent permeability. Detailed Implementation

[0025] The present invention is further illustrated below with reference to embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] In the following embodiments, the base asphalt is SBS modified asphalt; the aged asphalt is aged SBS modified asphalt; the waste rubber particles are obtained by mechanically grinding waste tires, with an average particle size of 2-3 mm; the mineral oil has a flash point of 240℃ and a Brookfield viscosity (60℃) of 441.2 mPa·s; the waste glass has a particle size of 4-5 mm; the water-reducing agent is a polycarboxylate high-efficiency water-reducing agent; the EVA emulsion has a solid content of 55% and a viscosity (25℃) of 4000 mPa·s; the pool ash comprises pool ash with an average particle size of 100 μm and pool ash with an average particle size of 50 μm, with a mass ratio of 2:1; the silicate cement is PO 52.5R silicate cement; and the granulated blast furnace slag is S95 grade with a specific surface area ≥0.36 m². 2 / g, 28d activity index greater than or equal to 70%; the silica fume is SF93, with silica content ≥85%, average particle size 0.1-0.2μm, moisture content <3%, loss on ignition <6%, pozzolanic activity index >90%, and specific surface area ≥15000m². 2 / kg; the diameter of the basalt fiber is 20-30μm and the length is 5-6mm.

[0027] Example 1

[0028] (1) Mix 40g of base asphalt and 50g of mineral oil and heat to 150℃ for 20min. Then add 3g of waste rubber particles and mix for the first time at 150℃ and 1000rpm for 20min. Then heat to 160℃ and mix for the second time at 4000rpm for 40min. Finally, cool down to 150℃ and mix for the third time at 500rpm for 30min to obtain asphalt recycling agent.

[0029] (2) Heat 30g of aged asphalt and add 0.09g of the asphalt recycling agent prepared above. Stir and mix at 160℃ and 500rpm for 50min, and then cool to room temperature to obtain recycled asphalt mixture.

[0030] (3) By weight, 90 parts of cement, 7 parts of recycled asphalt mixture, 15 parts of waste glass, 100 parts of granulated blast furnace slag, 20 parts of silica fume, 15 parts of pool ash, and 15 parts of basalt fiber are added to a mixer and stirred to obtain a mixture.

[0031] (4) By weight, mix 1.5 parts of water-reducing agent and 30 parts of water evenly, then add 15 parts of EVA emulsion and continue stirring. Finally, add 300 parts of the above-prepared mixture, stir and mix, place in a mold to form, then demold and cure to obtain a solid waste comprehensive utilization environmentally friendly high permeable pavement material.

[0032] Example 2

[0033] (1) Mix 50g of base asphalt and 60g of mineral oil and heat to 150℃ for 15min. Then add 3g of waste rubber particles and mix for the first time at 150℃ and 1200rpm for 15min. Then heat to 160℃ and mix for the second time at 4500rpm for 30min. Finally, cool down to 150℃ and mix for the third time at 800rpm for 20min to obtain asphalt recycling agent.

[0034] (2) Heat 30g of aged asphalt and add 0.15g of the asphalt recycling agent prepared above. Stir and mix at 160℃ and 600rpm for 30min, and then cool to room temperature to obtain recycled asphalt mixture.

[0035] (3) By weight, 100 parts of cement, 10 parts of recycled asphalt mixture, 18 parts of waste glass, 100 parts of granulated blast furnace slag, 20 parts of silica fume, 19 parts of pool ash, and 15 parts of basalt fiber are added to a mixer and stirred to obtain a mixture.

[0036] (4) By weight, mix 1.5 parts of water-reducing agent and 30 parts of water evenly, then add 16 parts of EVA emulsion and continue stirring. Finally, add 300 parts of the above-prepared mixture, stir and mix, place in a mold to form, then demold and cure to obtain a solid waste comprehensive utilization environmentally friendly high permeable pavement material.

[0037] Example 3

[0038] (1) Mix 45g of base asphalt and 50g of mineral oil and heat to 150℃ for 15min. Then add 3g of waste rubber particles and mix for the first time at 150℃ and 1100rpm for 20min. Then heat to 160℃ and mix for the second time at 4200rpm for 35min. Finally, cool down to 150℃ and mix for the third time at 600rpm for 30min to obtain asphalt recycling agent.

[0039] (2) Heat 30g of aged asphalt and add 0.12g of the asphalt recycling agent prepared above. Stir and mix at 160℃ and 500rpm for 40min, and then cool to room temperature to obtain recycled asphalt mixture.

[0040] (3) By weight, 98 parts of cement, 8 parts of recycled asphalt mixture, 15 parts of waste glass, 100 parts of granulated blast furnace slag, 21 parts of silica fume, 15 parts of pool ash, and 15 parts of basalt fiber are added to a mixer and stirred to obtain a mixture.

[0041] (4) By weight, mix 1.5 parts of water-reducing agent and 30 parts of water evenly, then add 14 parts of EVA emulsion and continue stirring. Finally, add 300 parts of the above-prepared mixture, stir and mix, place in a mold to form, then demold and cure to obtain a solid waste comprehensive utilization environmentally friendly high permeable pavement material.

[0042] Example 4

[0043] (1) Mix 45g of base asphalt and 55g of mineral oil and heat to 150℃ for 18min. Then add 3g of waste rubber particles and mix for the first time at 150℃ and 1200rpm for 20min. Then raise the temperature to 160℃ and mix for the second time at 4300rpm for 35min. Finally, cool down to 150℃ and mix for the third time at 700rpm for 20min to obtain asphalt recycling agent.

[0044] (2) Heat 30g of aged asphalt and add 0.12g of the asphalt recycling agent prepared above. Stir and mix at 160℃ and 550rpm for 40min, and then cool to room temperature to obtain recycled asphalt mixture.

[0045] (3) By weight, 100 parts of cement, 10 parts of recycled asphalt mixture, 16 parts of waste glass, 100 parts of granulated blast furnace slag, 20 parts of silica fume, 16 parts of pool ash, and 15 parts of basalt fiber are added to a mixer and stirred to obtain a mixture.

[0046] (4) By weight, mix 1.5 parts of water-reducing agent and 30 parts of water evenly, then add 15 parts of EVA emulsion and continue stirring. Finally, add 300 parts of the above-prepared mixture, stir and mix, place in a mold to form, then demold and cure to obtain a solid waste comprehensive utilization environmentally friendly high permeable pavement material.

[0047] Example 5

[0048] (1) Mix 48g of base asphalt and 60g of mineral oil and heat to 150℃ for 20min. Then add 3g of waste rubber particles and mix for the first time at 150℃ and 1200rpm for 20min. Then heat to 160℃ and mix for the second time at 4500rpm for 40min. Finally, cool down to 150℃ and mix for the third time at 800rpm for 30min to obtain asphalt recycling agent.

[0049] (2) Heat 30g of aged asphalt and add 0.12g of the asphalt recycling agent prepared above. Stir and mix at 160℃ and 600rpm for 50min, and then cool to room temperature to obtain recycled asphalt mixture.

[0050] (3) By weight, 100 parts of cement, 10 parts of recycled asphalt mixture, 15 parts of waste glass, 100 parts of granulated blast furnace slag, 18 parts of silica fume, 16 parts of pool ash, and 16 parts of basalt fiber are added to a mixer and stirred to obtain a mixture.

[0051] (4) By weight, mix 1.5 parts of water-reducing agent and 30 parts of water evenly, then add 16 parts of EVA emulsion and continue stirring. Finally, add 300 parts of the above-prepared mixture, stir and mix, place in a mold to form, then demold and cure to obtain a solid waste comprehensive utilization environmentally friendly high permeable pavement material.

[0052] The performance of the environmentally friendly high-permeability pavement material for comprehensive utilization of solid waste prepared in the above embodiments is tested below, and the test results are shown in Table 1.

[0053] Table 1

[0054] Permeability coefficient, mm / s 28-day compressive strength, MPa Example 1 0.65 53.5 Example 2 0.66 53.8 Example 3 0.64 52.9 Example 4 0.63 53.4 Example 5 0.65 53.6

[0055] The test results above show that the permeable pavement material prepared by this invention not only has good mechanical properties, but also excellent permeability.

[0056] Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to this invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A method for preparing environmentally friendly, highly permeable pavement materials at low cost through comprehensive utilization of solid waste, characterized in that, Includes the following steps: (1) Mix and heat the base asphalt and mineral oil, then add waste rubber particles, stir and mix for the first time, then heat up and stir and mix for the second time, and finally cool down and stir and mix for the third time to obtain asphalt recycling agent; the mass ratio of the base asphalt, mineral oil and waste rubber particles is (4-5): (5-6): 0.

3. (2) After heating the aged asphalt, add the asphalt recycling agent prepared above, stir and mix, and then cool to room temperature to obtain recycled asphalt mixture; the mass ratio of the aged asphalt to the asphalt recycling agent is 1: (0.03-0.05). (3) By weight, add 90-100 parts of cement, 5-10 parts of recycled asphalt mixture, 10-20 parts of waste glass, 60-120 parts of granulated blast furnace slag, 15-25 parts of silica fume, 10-20 parts of pool ash, and 10-20 parts of basalt fiber to a mixer and stir to obtain a mixture. (4) Mix the water-reducing agent and water evenly, then add EVA emulsion and continue stirring. Finally, add the mixture prepared above, stir and mix, place it in a mold to form, then demold and cure to obtain a solid waste comprehensive utilization environmental protection high permeability pavement material; the mass ratio of the water-reducing agent, water, EVA emulsion and mixture is (1-2): (30-40): (10-20):

300.

2. The method for preparing environmentally friendly, highly permeable pavement materials at low cost through comprehensive utilization of solid waste according to claim 1, characterized in that, In step (1), the base asphalt is SBS modified asphalt, the waste rubber particles are obtained by mechanical grinding of waste tires, and the average particle size is 2-3 mm. The flash point of the mineral oil is 240℃, and the Brinell viscosity at 60℃ is 441.2 mPa•s.

3. The method for preparing environmentally friendly, highly permeable pavement materials at low cost through comprehensive utilization of solid waste according to claim 1, characterized in that, In step (1), the temperature of the mixing and heating treatment is 140-150℃ and the time is 10-20 min; the temperature of the first mixing is 150℃ and the stirring speed is 1000-1200 rpm; the stirring time is 15-20 min; the temperature of the second mixing is 160℃ and the stirring speed is 4000-4500 rpm; the stirring time is 30-40 min; the temperature of the third mixing is 150℃ and the stirring speed is 500-800 rpm; the stirring time is 20-30 min.

4. The method for preparing environmentally friendly, highly permeable pavement materials at low cost through comprehensive utilization of solid waste according to claim 1, characterized in that, In step (2), the temperature of the stirring and mixing process is 160°C, the stirring speed is 500-600 rpm, and the stirring time is 30-50 min.

5. The method for preparing environmentally friendly, highly permeable pavement materials at low cost through comprehensive utilization of solid waste according to claim 1, characterized in that, In step (3), the particle size of the waste glass is 4-5 mm.

6. The method for preparing environmentally friendly, highly permeable pavement materials at low cost through comprehensive utilization of solid waste according to claim 1, characterized in that, In step (4), the water-reducing agent is a polycarboxylate high-efficiency water-reducing agent; the solid content of the EVA emulsion is 55%, and its viscosity at 25°C is 4000 mPa•s; the pool ash includes pool ash with an average particle size of 100 μm and pool ash with an average particle size of 50 μm, with a mass ratio of 2:1.