An environmentally friendly rubber asphalt material prepared by synergistically preparing multiple solid wastes and its preparation process

Abstract

The present application relates to the field of road engineering materials, and specifically discloses an environmentally friendly rubber asphalt material prepared by the synergistic preparation of multiple solid wastes and its preparation process. An environmentally friendly rubber asphalt material prepared by the synergistic preparation of multiple solid wastes includes the following raw materials in parts by weight: 100-140 parts of elastomer-modified asphalt, 15-25 parts of waste rubber powder, 0.5-1 parts of SBR, 1-3 parts of stabilizer, 1.5-3 parts of anti-stripping agent, 30-50 parts of multi-solid waste ceramsite, 10-14 parts of aromatic oil, and 5-15 parts of tackifier; the waste rubber powder is made by mixing and crushing waste tires and EPDM rubber, and the multi-solid waste ceramsite is made by granulating, drying, preheating, and sintering the solid waste raw materials to form a wet material, and the solid waste raw materials include copper tailings, fly ash from the incineration of domestic waste, Baiyun tailings, and sawdust. The rubber asphalt material of the present application has ceramsite made from a variety of solid waste materials, which can simultaneously achieve the advantages of high permeability, high mechanical strength, and freeze-thaw resistance.

Description

Technical Field

[0001] The present application relates to the technical field of road engineering materials, and more specifically, to an environmentally friendly rubber asphalt material prepared by synergistically preparing multiple solid wastes and a preparation process thereof. Background Art

[0002] Rubber asphalt is an asphalt binder made from scrap tires. It boasts high-temperature stability, low-temperature flexibility, aging resistance, fatigue resistance, and water damage resistance. It is an ideal environmentally friendly pavement material, primarily used in prestressed absorbing layers and surface layers in road structures. It effectively extends the pavement's service life while reducing noise, vibration, and resisting thermal and low-temperature cracking. Rubber asphalt not only provides a high-quality construction material for road construction, conserving petroleum asphalt resources, but also addresses the solid waste disposal channel, transforming scrap rubber tires into valuable assets. Therefore, producing rubber asphalt from tire rubber powder offers significant economic and social benefits.

[0003] Permeable asphalt pavement is a key pavement type in sponge city road construction, significantly reducing rainwater runoff, enhancing road skid resistance, and improving road traffic safety. However, due to the low mechanical strength of the aggregate, traditional permeable asphalt pavements often suffer from structural defects such as loosening and potholes under load. At urban intersections or on heavily trafficked roads, they are more susceptible to deformation and damage such as rutting, congestion, and cracking. Consequently, conventional permeable asphalt pavements suffer from poor overall durability.

[0004] At present, industrial solid waste is of various types and complex composition, such as blast furnace slag, steel slag, metal slag, furnace slag, coal gangue, etc. In order to achieve rational utilization of resources and sustainable development of the environment, the application of solid waste in road construction is a common method. However, solid waste is mostly used alone. For example, CN2019109400971 discloses a high-strength and durable steel slag permeable asphalt pavement structure, and CN2020111469403 discloses a coal gangue asphalt mixture. Therefore, there is currently a lack of a rubber asphalt that utilizes multiple solid waste raw materials to keep the road highly permeable while still having high resistance to rutting and deformation. Summary of the Invention

[0005] In order to make the rubber asphalt material have higher permeability and mechanical strength, and at the same time recycle and utilize a variety of solid wastes, the present application provides an environmentally friendly rubber asphalt prepared by synergistically using multiple solid wastes and a preparation process thereof.

[0006] In the first aspect, the present application provides an environmentally friendly rubber asphalt material prepared by synergistically preparing multiple solid wastes, using the following technical solutions:

[0007] An environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes, comprising the following raw materials in parts by weight: 100-140 parts of elastomer-modified asphalt, 15-25 parts of waste rubber powder, 0.5-1 part of SBR, 1-3 parts of stabilizer, 1.5-3 parts of anti-stripping agent, 30-50 parts of multi-solid waste ceramsite, 10-14 parts of aromatic oil, and 5-15 parts of tackifier;

[0008] The waste rubber powder is made by mixing and crushing waste tires and EPDM rubber in a mass ratio of 1:0.3-0.5;

[0009] The multi-solid waste ceramsite is made by adding water to solid waste raw materials to form wet materials, then granulating, drying, preheating at 340-350°C for 20-30 minutes, and sintering at 1050-1100°C for 20-30 minutes. The solid waste raw materials include copper tailings, domestic waste incineration fly ash, Baiyun tailings and sawdust in a mass ratio of 9:1:0.25-0.5:0.6-1.

[0010] By adopting the above technical solution, rubber powder is added to the elastomer-modified asphalt. Rubber powder is a powder material with a cross-linked structure. The rubber powder contains carbon black. The carbon black is uneven. The carbon black molecules have highly active activation points and unpaired electrons, which can react chemically with the asphalt. The asphalt is adsorbed on the surface of the carbon black and chemically combined, so that the asphalt is adsorbed on the surface of the carbon black and moves with the carbon black, forming a strong bond that can slip between the carbon black and the asphalt, thereby realizing the reinforcement of the elastomer-modified asphalt by the carbon black.

[0011] The main components of copper tailings are silicon dioxide, calcium oxide, iron oxide and magnesium oxide, while the content of silicon dioxide and aluminum oxide in copper tailings is relatively small, so it is necessary to add waste incineration fly ash to adjust the silicon dioxide and aluminum oxide in the tailings. Domestic waste contains a large amount of chlorine, and the incineration process will cause the redistribution of heavy metals and chlorine in the waste, resulting in the incineration fly ash having a higher pollutant concentration than the incineration bottom ash. The fly ash has a small particle size, a large specific surface area, and is hygroscopic and fluttering. The main component is calcium oxide, followed by silicon dioxide, aluminum oxide and iron oxide. Dolomite tailings contain calcium fluoride, silicon dioxide, ferric oxide, dolomite, barium sulfate and sodium pyroxene. The fluoride and alkali metal compounds therein are conducive to the formation of liquid phase at low temperature during the sintering process, reducing the sintering temperature and increasing the strength of multi-solid waste ceramsite. The decomposition of carbonate during the sintering process is conducive to increasing the porosity of multi-solid waste ceramsite and improving water permeability. The three are used in combination to adjust the silicon dioxide and aluminum oxide composition in the ceramsite, and exist in the ceramsite in the form of crystal structure and glass phase. After a series of complex chemical and physical reactions, mullite crystals are formed, which are the main component of the mechanical strength of ceramsite. However, the content of silicon dioxide and aluminum oxide should not be too high. Too high will cause the sintering temperature of the ceramsite to be high, or even explode. Therefore, the amount of copper tailings, waste incineration fly ash and Baiyun tailings is adjusted to make the product quality of the ceramsite stable. Moreover, if the content of alkali metal oxides such as calcium oxide and magnesium oxide in the fluxing components is too high, more liquid phase substances will be produced during sintering of the ceramsite, filling the internal pores, reducing the porosity of the ceramsite and increasing the particle density. Sawdust is used as the gas-producing component, which contains a certain amount of organic matter or carbonate, which decomposes at high temperature to produce carbon dioxide. At the same time, the viscous liquid phase substance produced by the fluxing component will be wrapped by the liquid phase substance as the amount of carbon dioxide and liquid increases, causing the ceramsite to expand and form a hollow structure in the internal space of the ceramsite. However, if there is too much gas-producing component, the interior of the ceramsite will be broken due to excessive expansion and too many holes. Insufficient gas-producing component will cause the ceramsite to not expand during sintering.

[0012] After granulation and drying, the solid waste raw materials are preheated, which can gradually heat the ceramsite. When entering the sintering stage, it will not explode due to sudden exposure to high temperature. If the preheating time is extended, it will decompose or produce organic matter and carbonates, etc., so that the ceramsite has a certain viscosity after entering the sintering stage, the gas generated is reduced, the expansion is reduced, and the density is increased, which is beneficial to improve the strength of the ceramsite. After sufficient preheating, it enters the sintering stage. A large amount of gas is generated inside the ceramsite, and a large amount of liquid phase appears on the surface. The gas generated inside is wrapped by the surface liquid phase to form a porous structure. The excess liquid phase is bonded and filled in the pores of the ceramsite raw material particles, which increases the strength of the ceramsite, thereby obtaining a multi-solid waste ceramsite with the advantages of large specific surface area, high water absorption rate, high cylinder pressure strength, light weight, anti-freeze, corrosion resistance, sound absorption and noise reduction, thermal insulation, etc., thereby improving the permeability of rubber asphalt while enhancing its compressive strength, improving rutting resistance and deformation resistance.

[0013] Optionally, the method for preparing the multi-solid waste ceramsite is as follows:

[0014] The copper tailings are mixed evenly with waste incineration fly ash, Baiyun tailings and wood chips to obtain solid waste raw materials;

[0015] Adding 20-30 wt% of water to the solid waste raw material and mixing them evenly to form a wet material;

[0016] Granulating the wet material to obtain raw balls with a particle size of 5-9 mm;

[0017] The raw material balls are dried at 100-110° C. for 4-5 hours, then preheated at 340-350° C. for 20-30 minutes, and sintered at 1050-1100° C. for 20-30 minutes to prepare the multi-solid waste ceramsite.

[0018] By adopting the above-mentioned technical solution and using copper tailings, waste incineration fly ash, Baiyun tailings and sawdust as raw materials to calcine expanded clay, expanded clay with pore structures of different sizes and shapes can be produced. This can greatly reduce the pollution to the land, water bodies and the environment, solve the problem of occupying land resources due to landfill accumulation, promote my country's solid waste treatment and the realization of dual carbon goals, and has obvious economic and environmental benefits.

[0019] Optionally, the multi-solid waste ceramsite is pretreated as follows:

[0020] Dissolve sodium chloride to prepare a sodium chloride solution with a concentration of 15-20 wt%, add sodium lauryl sulfate, mix well, and obtain a soaking solution, wherein the mass ratio of sodium lauryl sulfate to sodium chloride is 0.015-0.025:1;

[0021] Adding the solid waste ceramsite into the soaking solution, soaking at 35-45°C for 5-7 hours, filtering and drying to obtain the salt-loaded ceramsite;

[0022] Anhydrous ethanol and distilled water are mixed in a mass ratio of 55-60:1, the pH is adjusted to 2-3, 6.5-6.7% of hexadecyltrimethoxysilane is added, and the mixture is stirred at room temperature to obtain a spray liquid. The spray liquid is evenly sprayed on the salt-loaded ceramsite and allowed to stand at room temperature for 20-24 hours. The mass ratio of the spray liquid to the salt-loaded ceramsite is 0.1-0.2:1.

[0023] By adopting the above technical solution, the porous foaming structure inside the multi-solid waste ceramsite is dense and uniform, with good adsorption performance, rich macroscopic structure on the surface, rough and irregular, and soaked in a sodium chloride solution with a concentration of 15-20wt% at 35-45°C. At this concentration and temperature, the molecular movement rate in the solution is accelerated, and the adsorbed sodium chloride can overcome the liquid film resistance on the surface of the multi-solid waste ceramsite, which is conducive to the migration of sodium chloride along the micropores of the multi-solid waste ceramsite to the inside. Moreover, under the action of sodium dodecyl sulfate, the solid-liquid-gas interface state is improved, and the contact angle is reduced, so that it can better infiltrate and spread in the internal voids of the multi-solid waste ceramsite. After the soaking and adsorption are completed, it is dried to allow the sodium chloride to continue to crystallize in the multi-solid waste ceramsite, and the condensed and solidified sodium chloride is interlocked with the multi-solid waste ceramsite, thereby strengthening the ceramsite's absorption of sodium chloride. Adsorption makes the expanded clay and sodium chloride adhere tightly to each other, ensuring the stability of sodium chloride. Sodium chloride is continuously released in the asphalt material, inhibiting freezing and reducing freeze-thaw quality and strength loss; hexadecyltrimethoxysilane forms hexadecylsilanol after hydrolysis, which has three terminal hydroxyl groups. The three terminal hydroxyl groups can undergo intermolecular condensation reaction with the hydroxyl groups on the salt-loaded expanded clay to form silicon-oxygen chemical bonds, forming a hydrophobic film on the surface of the salt-loaded expanded clay, reducing the absorption of water by the expanded clay, reducing the retention in rubber asphalt, and reducing cracking caused by low-temperature ice crystal expansion. In addition, hexadecyltrimethoxysilane is easily hydrolyzed and condensed to form polysiloxane, which has strong tolerance to chemical substances such as acids, alkalis and salts, so that it has better protection effect in saline environment, and can reduce the corrosion of salts such as sodium chloride to multi-solid waste expanded clay and rubber asphalt materials.

[0024] Optionally, the anti-stripping agent is hydrophobically modified polyester fiber.

[0025] In winter, when moisture penetrates into the road surface, the physical frost heave effect of water causes the road surface to be subjected to expansion pressure generated by water crystallization. After repeated freezing and thawing, the overall stability of the internal structure is damaged to a certain extent. Moreover, in winter, because the road surface is frozen, when salt-based snow-melting agents are used, the salt expands on the road surface due to freezing, which will further increase the damage to the road surface. By adopting the above technical solution, the hydrophobically modified polyester fiber can be evenly distributed in the rubber asphalt and form a fiber network structure, which increases the viscosity of the rubber asphalt, enhances the cohesion of the asphalt material, and increases the grip of the asphalt on the multi-solid waste ceramsite, so that the gaps in the mixed material are well filled. If the asphalt needs to be stripped, a larger interfacial energy is required, so it can effectively alleviate the erosion of the salt solution and the stripping effect of the crystallization expansion on the bonding between the asphalt and the aggregate interface. The polyester fiber has load transfer capacity and balancing effect in the asphalt mixture, and can disperse the external load in the multi-solid waste ceramsite and rubber asphalt, thereby improving the toughness of the rubber asphalt. The three-dimensional multi-directionally distributed polyester fibers overlap each other, showing a good bridging and reinforcement effect. When the rubber asphalt is anti-icing at low temperatures using snow-melting salt, It can prevent the formation and expansion of cracks and damage when expansion cracks and damage are generated by freeze-thaw cycles in salt solutions, and can also fill gaps, increase density, and reduce freeze-thaw corrosion resistance; and the fiber ends are connected to the asphalt to form tentacles, which have the effect of anchoring and interlocking the internal structure of the asphalt material. The fiber surface and fiber roots are firmly bonded to the asphalt material, thereby strengthening the asphalt structure and obtaining a higher-strength interface layer. On the whole, the polyester fibers overlap with each other in the asphalt material to form a dense, high-tensile-strength spatial network structure, which fully plays the role of reinforcement, toughening and crack resistance, and can also limit the mutual slippage of the interface of multiple solid waste ceramsite. In addition, the hydrophobically modified polyester fiber absorbs less water, which facilitates the penetration of water and does not remain in the rubber asphalt pavement, reducing the impact of water expansion on the pavement.

[0026] Optionally, the preparation method of the hydrophobically modified polyester fiber is:

[0027] The silane-modified silica particles were mixed with butyl acetate, and ultrasonically dispersed for 20-30 minutes. Polyurea resin and curing agent were added, and the mixture was stirred to obtain a treatment solution.

[0028] The treatment liquid is sprayed on the polyester fiber, and dried at 80-85° C. for 8-10 hours to obtain the modified polyester fiber.

[0029] By adopting the above technical solution, the urea groups in the polyurea molecule are densely present, and the urea groups are centered on the C=0 group, have extremely strong hydrogen bonding, large intermolecular force, and have the advantages of corrosion resistance, high wear resistance, scratch resistance, and high ductility. After spraying, a super hydrophobic coating is formed on the surface of the polyester fiber, and the silane-modified silica particles are evenly covered on the surface of the polyurea resin, forming a rich micro-nano composite rough structure with the micron-scale skeleton and nano-scale micropores of the polyurea resin, thereby increasing the contact angle of the polyurea hydrophobic coating, making it have better hydrophobic properties, thereby enhancing the anti-freeze sticking performance of the coating, and the silica particles are treated with silane hydrophobic modification, which not only increases the particle size and reduces the surface energy, but also improves the formation of The micron-scale wrinkles and nano-scale roughness of its surface form a secondary composite structure. By capturing air, water droplets are kept in a non-wetted state. The trapped air reduces the interaction between water droplets and the surface of the polyester fiber, making it difficult for water droplets to remain on the surface of the polyester fiber and can easily slide off its surface, thereby causing water droplets to fall due to gravity and preventing them from freezing on the surface of the polyester fiber. Moreover, the gas-liquid-solid three-phase contact state on the surface of the polyester fiber effectively reduces the heat transfer efficiency, forms a thermal insulation layer, avoids water droplets from freezing, and prolongs the duration of freezing. In addition, the nanostructured pores formed by the silane-modified silica particles reduce the possibility of uneven nucleation of ice crystals, thereby reducing the adhesion of the ice layer and improving the low-temperature resistance to freezing and cracking.

[0030] Optionally, the mass ratio of the silane-modified silica particles, butyl acetate, polyurea resin and curing agent is 3-4:8-9:2-3:1-1.5; and the mass ratio of the treatment liquid to the polyester fiber is 0.1-0.3:1.

[0031] By adopting the above technical solution, the dosage of the above raw materials can make the treatment liquid evenly adhere to the surface of the polyester fiber, and the silane-modified silica particles can be firmly and evenly distributed on the polyester fiber, thereby improving the interfacial interaction force between the polyester fiber and the raw materials and enhancing the anti-cracking effect.

[0032] Optionally, the preparation method of the silane-modified silica particles is:

[0033] Anhydrous ethanol and deionized water were mixed, and glacial acetic acid was added to prepare a mixed solution A; anhydrous ethanol, silica phase change capsules and tetrabutyl titanate were mixed to prepare a solution B;

[0034] Add solution B to solution A, react at 200-220°C for 20-24 hours, centrifuge, wash, dry, and calcine at 450-500°C for 2-3 hours to obtain modified silica phase change capsules;

[0035] Anhydrous ethanol, toluene and perfluorooctyltriethoxysilane were mixed, the pH was adjusted to 9, modified silica phase change capsules were added, ultrasonicated for 20-30 minutes, stirred at 60-65° C. for 5-6 hours, centrifuged, washed and dried to obtain silane-modified silica particles.

[0036] By adopting the above technical solution, silica phase change capsules are used as carriers, and spherical titanium dioxide materials are loaded on their surface. Titanium dioxide can be evenly coated on the silica phase change capsules to form a micro-nano structure with a certain roughness, which reduces the agglomeration of titanium dioxide and controls the diameter of titanium dioxide. At the same time, the photocatalytic effect of silica capsules is improved. When the rubber asphalt material pavement is mechanically damaged or contaminated by organic matter, the super-hydrophobic property can be restored under ultraviolet irradiation. It also has good chemical stability and can reduce salt corrosion.

[0037] Fluoroalkyl silane is used to hydrophobically modify the modified silica phase change capsules. Perfluorooctyl triethoxysilane is 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane is an organic silane that can hydrolyze and cross-link in a humid environment to form a highly hydrophobic solid film. The three-dimensional waterproof structure of the mesh film effectively prevents the capillary absorption of water by the capillary pores, thereby achieving a better waterproof effect. The silicon-oxygen bond has a high bond energy, excellent weather resistance, and a long-lasting waterproof effect. The silane-modified silica particles have good hydrophobicity and are more evenly dispersed in the polyurea resin, thereby being evenly distributed on the polyester fiber, increasing the roughness of the polyester fiber, improving the interfacial force between the polyester fiber and rubber asphalt, and increasing the crack resistance.

[0038] Optionally, the wall material of the silica phase change capsule is silica, and the core material is tetradecane.

[0039] By adopting the above technical solution, tetradecane is a solid-liquid phase change material, and silica has good stability. With silica as the shell and tetradecane as the new phase change material, the decondensation of ethyl orthosilicate in an alkaline environment after hydrolysis is utilized to obtain a highly ordered three-dimensional cross-linked network structure, and the tetradecane is coated. Moreover, after hydrophobic modification by silane, the silica phase change capsules are added to the rubber asphalt, so that the rubber asphalt has phase change temperature regulating properties, can achieve anti-icing, reduce the freezing expansion of water inside the asphalt pavement, reduce the adhesion strength of ice crystals on the asphalt pavement, and easily remove ice after the road surface is frozen.

[0040] Optionally, the tackifier is selected from at least one of petroleum resin, liquid coumarone, terpene resin and rosin resin.

[0041] By adopting the above technical solution, the above tackifying resin can increase the viscosity of rubber asphalt, help to quickly fix and bond during construction, ensure long-term stability and durability, and improve the compatibility of rubber asphalt, avoid the occurrence of stratification and precipitation, and improve heat resistance.

[0042] In a second aspect, the present application provides a process for preparing an environmentally friendly rubber asphalt material by synergistically preparing multiple solid wastes, which adopts the following technical solutions:

[0043] A process for preparing an environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes comprises the following steps: mixing elastomer-modified asphalt and aromatic oil, heating to 160-170° C., adding waste rubber, and mixing and stirring for 30-40 minutes to prepare a binder;

[0044] The binder temperature is maintained at 160-170° C., and solid waste ceramsite, stabilizer, anti-stripping agent and tackifier are added, mixed and stirred for 40-60 minutes to obtain an environmentally friendly rubber asphalt material.

[0045] In summary, this application has the following beneficial effects:

[0046] 1. Since this application uses solid waste raw materials such as copper tailings, Baiyun tailings and waste incineration fly ash, which are preheated and roasted to produce multi-solid waste ceramsite with high cylinder pressure strength and good water permeability, it can enhance the water permeability of rubber asphalt materials while improving their compressive strength, increase their anti-rutting and anti-cracking capabilities, and reduce the pollution of solid waste raw materials to the environment.

[0047] 2. In this application, it is preferred to load sodium chloride in the multi-solid waste ceramsite by solution impregnation, and then use hexadecyltrimethoxysilane for hydrophobic treatment to increase the anti-icing effect of the multi-solid waste ceramsite in winter, reduce the retention of water in the asphalt material, and thus improve the freeze-thaw resistance of the asphalt pavement.

[0048] 3. This application preferably uses hydrophobically modified polyester fiber as an anti-stripping agent, which can form a fiber network structure, increase the interfacial force between the raw materials, and at the same time delay the erosion of salt snow-melting agents, reduce the expansion cracks caused by salt ice condensation in winter, enhance the toughness and crack resistance of asphalt materials, and improve freeze-thaw resistance. DETAILED DESCRIPTION

[0049] The following examples further illustrate the present application in detail.

[0050] Preparation Examples 1-4 of Multi-Solid Waste Ceramsite

[0051] The fly ash from the incineration of domestic waste in Preparation Example 1-2 was selected from a waste incineration power plant, wherein the dioxin content was ≤10 ng-TEQ / kg, and there was no risk of dioxin poisoning. The density of the sawdust was 530 kg / m3, and the ignition point was 220°C. The main chemical components of the copper tailings are shown in Table 1, and the main chemical components of the Baiyun tailings are shown in Table 2.

[0052] Preparation Example 1: (1) 900 g of copper tailings, 100 g of domestic waste incineration fly ash, 50 g of Baiyun tailings, and 100 g of sawdust were mixed uniformly and dried at 180° C. for 2 h to obtain a solid waste raw material;

[0053] (2) adding 30 wt% of water to the solid waste raw material and mixing them evenly to form a wet material;

[0054] (3) granulating the wet material to obtain raw material balls with a particle size of 9 mm;

[0055] (4) The raw material balls were dried at 110°C for 4 h, then preheated at 350°C for 20 min, and sintered at 1050°C for 30 min to produce multi-solid waste ceramsite.

[0056] Table 1 Main chemical components of copper tailings

[0057]

[0058] Table 2 Main chemical components of Baiyun tailings

[0059]

[0060] Preparation Example 2: (1) 900 g of copper tailings, 100 g of domestic waste incineration fly ash, 25 g of Baiyun tailings, and 60 g of sawdust were mixed uniformly and dried at 180° C. for 2 h to obtain a solid waste raw material;

[0061] (2) adding 20 wt% of water to the solid waste raw material and mixing them evenly to form a wet material;

[0062] (3) Granulating the wet material to obtain raw material balls with a particle size of 5 mm;

[0063] (4) The raw material balls were dried at 100°C for 5 h, then preheated at 340°C for 30 min, and sintered at 1100°C for 20 min to produce multi-solid waste ceramsite.

[0064] Preparation Example 3: The difference from Preparation Example 1 is that an equal amount of stone powder is used instead of sawdust. The calcium carbonate content in the stone powder is above 99.5%, and the density is 2700 kg / m 3 .

[0065] Preparation Example 4: The difference from Preparation Example 1 is that no dolomite tailings are added.

[0066] According to Preparation Examples 1-4, multi-solid waste ceramsite was prepared. The bulk density, apparent density, porosity, water absorption rate and cylinder compressive strength were tested with reference to GB / T17431.2-2010 "Test Methods for Light Aggregates". A 300KN universal testing press was used. The average strength of 10 multi-solid waste ceramsite pellets was taken as the test result. The compressive strength of a single pellet was calculated according to the following formula: F = 2.8P / (πd 2 ), where F is the compressive strength of a single particle of multi-solid waste ceramsite (MPa), P is the maximum instantaneous pressure of the multi-solid waste ceramsite when crushed (N), and is the diameter of the vertical pressure-bearing surface of the multi-solid waste ceramsite (mm). The test results are recorded in Table 3.

[0067] Table 3 Performance test of multi-solid waste ceramsite

[0068]

[0069] As shown in Table 3, when stone powder is used as a porogen, the calcium carbonate in it decomposes when heated, releasing a large amount of carbon dioxide. At high temperature, the stone powder can react with silicon dioxide to form calcium silicate, resulting in a decrease in the silicon dioxide content, a decrease in the content of mullite crystals, and a decrease in strength. Without adding dolomite tailings to form a liquid phase, the porosity is reduced.

[0070] Preparation Examples 5-12 of Hydrophobically Modified Polyester Fiber

[0071] Preparation Example 5: 30 g of silane-modified silica particles were mixed with 80 g of butyl acetate, ultrasonically dispersed at a power of 200 W for 30 min, 20 g of polyurea resin and 10 g of curing agent were added, and stirred evenly to prepare a treatment liquid. The polyurea resin was polyaspartic acid ester polyurea, selected from Hunan Tuochuang Polymer New Materials, model 283, and a solid content of 50%. The curing agent was selected from Covestro, Germany, model N75. The preparation method of the silane-modified silica particles was as follows: 30 ml of anhydrous ethanol, 30 ml of toluene and 2 ml of perfluorooctyltriethoxysilane were mixed, the pH was adjusted to 9, the silica particles were added, ultrasonicated for 20 h, stirred at 60 ° C for 5 h, centrifuged, washed, and dried;

[0072] The treatment liquid was evenly sprayed on the polyester fiber and dried at 85°C for 8 hours to obtain modified polyester fiber. The length of the polyester fiber was 12 mm and the diameter was 20 μm. The mass ratio of the treatment liquid to the polyester fiber was 0.3:1.

[0073] Preparation Example 6: 40 g of silane-modified silica particles were mixed with 90 g of butyl acetate, ultrasonically dispersed at a power of 200 W for 20 min, 30 g of polyurea resin and 15 g of curing agent were added, and stirred evenly to prepare a treatment liquid. The polyurea resin was polyaspartic acid ester polyurea, selected from Hunan Tuochuang Polymer New Materials, model 283, and a solid content of 50%. The curing agent was selected from Covestro, Germany, model N75. The preparation method of the silane-modified silica particles was as follows: 30 ml of anhydrous ethanol, 30 ml of toluene and 2 ml of perfluorooctyltriethoxysilane were mixed, the pH was adjusted to 9, the silica particles were added, ultrasonicated for 20 h, stirred at 60 ° C for 5 h, centrifuged, washed, and dried;

[0074] The treatment liquid was evenly sprayed on the polyester fiber and dried at 80° C. for 10 h to obtain modified polyester fiber. The polyester fiber had a length of 12 mm and a diameter of 20 μm. The mass ratio of the treatment liquid to the polyester fiber was 0.1:1.

[0075] Preparation Example 7: The difference from Preparation Example 5 is that no silane-modified silica particles are added.

[0076] Preparation Example 8: The difference from Preparation Example 5 is that the silicon dioxide particles are not subjected to silane modification treatment.

[0077] Preparation Example 9: The difference from Preparation Example 5 is that the silane-modified silica particles are prepared by the following method: 10 ml of anhydrous ethanol and deionized water are mixed in a volume ratio of 1:1, and an appropriate amount of glacial acetic acid is added to prepare a mixed solution A; 20 ml of anhydrous ethanol, 100 mg of silica phase change capsules and 500 μl of tetrabutyl titanate are mixed to prepare solution B, the wall material of the silica phase change capsules is silica, and the core material is tetradecane. The preparation method is as follows: 5 g of tetradecane, 1 g of hexadecyltrimethylammonium bromide, 30 g of deionized water and 35 g of anhydrous ethanol are mixed to obtain an emulsion, 6 g of tetraethyl orthosilicate and 12 g of ammonia water are added, and the mixture is stirred and reacted at 60°C for 5 h, filtered, washed, and vacuum dried;

[0078] Solution B was added to solution A, reacted at 200°C for 24 hours, centrifuged, washed, dried, and calcined at 500°C for 2 hours to obtain modified silica phase change capsules;

[0079] 30 ml of anhydrous ethanol, 30 ml of toluene and 2 ml of perfluorooctyltriethoxysilane were mixed, the pH was adjusted to 9, modified silica phase change capsules were added, ultrasonicated for 20 h, stirred at 60° C. for 5 h, centrifuged, washed and dried to obtain silane-modified silica particles.

[0080] Preparation Example 10: The difference from Preparation Example 5 is that silane-modified silica particles are prepared by the following method: 10 ml of anhydrous ethanol and deionized water are mixed in a volume ratio of 1:1, and an appropriate amount of glacial acetic acid is added to prepare a mixed solution A; 20 ml of anhydrous ethanol, 100 mg of silica phase change capsules, and 500 μl of tetrabutyl titanate are mixed to prepare solution B, in which the wall material of the silica phase change capsules is silica and the core material is tetradecane. The preparation method is as follows: 5 g of tetradecane, 1 g of hexadecyltrimethylammonium bromide, 30 g of deionized water, and 35 g of anhydrous ethanol are mixed to obtain an emulsion, 6 g of ethyl orthosilicate and 12 g of ammonia water are added, and the mixture is stirred and reacted at 60°C for 5 h, filtered, washed, and vacuum dried;

[0081] Solution B was added to solution A, reacted at 220°C for 20 h, centrifuged, washed, dried, and calcined at 450°C for 3 h to obtain modified silica phase change capsules;

[0082] 30 ml of anhydrous ethanol, 30 ml of toluene and 2 ml of perfluorooctyltriethoxysilane were mixed, the pH was adjusted to 9, modified silica phase change capsules were added, ultrasonicated for 30 h, stirred at 65 ° C for 6 h, centrifuged, washed and dried to obtain silane-modified silica particles.

[0083] Preparation Example 11: The difference from Preparation Example 9 is that tetrabutyl titanate is not added.

[0084] Preparation Example 12: The difference from Preparation Example 9 is that silica particles are used instead of silica phase change capsules.

[0085] Example

[0086] Example 1: An environmentally friendly rubber asphalt material prepared by the coordinated use of multiple solid wastes, the raw material amounts are shown in Table 4, wherein the elastomer modified asphalt is SBS modified asphalt, the SBS modified asphalt is selected from Foshan Chuanglixin Chemical, and the item number is ID, the waste rubber powder is obtained by mixing waste tires and EPDM rubber in a mass ratio of 1:0.5, crushing, removing iron, and grinding to 5 mm, SBR is selected from Xiamen Mingjia New Materials, model SBR1502, the stabilizer is butyl rubber, selected from Jiangsu Guanfu New Materials, brand GF2022, item number G111f8x, the anti-stripping agent is selected from Jinan Xichuan Chemical Technology, model XC-067, the multi-solid waste ceramsite is prepared according to Preparation Example 1, and the tackifier is hydrogenated C9 petroleum resin, selected from Guangzhou Linli New Materials, item number 1113, model HPR-C9100.

[0087] The preparation process of the environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes comprises the following steps: mixing elastomer-modified asphalt and aromatic oil, heating to 160°C, adding waste rubber, and mixing and stirring for 40 minutes to prepare a binder;

[0088] The binder temperature was maintained at 160° C., and solid waste ceramsite, stabilizer, anti-stripping agent and tackifier were added and mixed and stirred for 40 minutes to obtain an environmentally friendly rubber asphalt material.

[0089] Table 4 Raw material usage of environmentally friendly rubber asphalt materials

[0090]

[0091]

[0092] Example 2: An environmentally friendly rubber asphalt material prepared in a coordinated manner from multiple solid wastes, the raw material amounts are shown in Table 4, wherein the elastomer modified asphalt is SBS modified asphalt, the SBS modified asphalt is selected from Foshan Chuanglixin Chemical, with the item number ID, the waste rubber powder is obtained by mixing waste tires and EPDM rubber in a mass ratio of 1:0.5, crushing, removing iron, and grinding to 5 mm, SBR is selected from Xiamen Mingjia New Materials, model SBR1502, the stabilizer is butyl rubber, selected from Jiangsu Guanfu New Materials, brand GF2022, item number G111f8x, the anti-stripping agent is selected from Jinan Xichuan Chemical Technology, model XC-067, the multi-solid waste ceramsite is prepared according to Preparation Example 2, the tackifier is hydrogenated C9 petroleum resin, selected from Guangzhou Linli New Materials, item number 1113, model HPR-C9100.

[0093] The preparation process of the environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes comprises the following steps: mixing elastomer-modified asphalt and aromatic oil, heating to 170°C, adding waste rubber, and mixing and stirring for 30 minutes to prepare a binder;

[0094] The binder temperature was maintained at 170° C., and solid waste ceramsite, stabilizer, anti-stripping agent and tackifier were added and mixed and stirred for 30 minutes to obtain an environmentally friendly rubber asphalt material.

[0095] Example 3-4: An environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes. The difference from Example 1 is that the raw material amounts are as shown in Table 4.

[0096] Example 5: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 1 is that the multi-solid waste ceramsite is prepared by Preparation Example 3.

[0097] Example 6: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 1 is that the multi-solid waste ceramsite is prepared by Preparation Example 4.

[0098] Example 7: An environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes. The difference from Example 1 is that the ceramsite from multiple solid wastes undergoes the following pretreatment:

[0099] Sodium chloride was dissolved in deionized water to prepare a 20 wt% sodium chloride solution, sodium lauryl sulfate was added, and the mixture was mixed to obtain a soaking solution, wherein the mass ratio of sodium lauryl sulfate to sodium chloride was 0.025:1;

[0100] The solid waste ceramsite was added into the soaking solution, soaked at 45°C for 5 hours, filtered and dried to obtain the salt-loaded ceramsite;

[0101] Anhydrous ethanol and distilled water were mixed in a mass ratio of 60:1, the pH was adjusted to 3, 6.7% of hexadecyltrimethoxysilane was added, and the mixture was stirred at room temperature to obtain a spray liquid. The spray liquid was evenly sprayed on the salt-loaded ceramsite and allowed to stand at room temperature for 24 hours. The mass ratio of the spray liquid to the salt-loaded ceramsite was 0.2:1.

[0102] Example 8: An environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes. The difference from Example 1 is that the ceramsite from multiple solid wastes undergoes the following pretreatment:

[0103] Sodium chloride was dissolved in deionized water to prepare a 15 wt% sodium chloride solution, sodium lauryl sulfate was added, and the mixture was mixed to obtain a soaking solution, wherein the mass ratio of sodium lauryl sulfate to sodium chloride was 0.015:1;

[0104] The solid waste ceramsite was added into the soaking solution, soaked at 35°C for 7 hours, filtered and dried to obtain the salt-loaded ceramsite;

[0105] Anhydrous ethanol and distilled water were mixed in a mass ratio of 55:1, the pH was adjusted to 2, 6.5% of hexadecyltrimethoxysilane was added, and the mixture was stirred at room temperature to obtain a spray liquid. The spray liquid was evenly sprayed on the salt-loaded ceramsite and allowed to stand at room temperature for 20 hours. The mass ratio of the spray liquid to the salt-loaded ceramsite was 0.1:1.

[0106] Example 9: An environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes. The difference from Example 7 is that the ceramsite from multiple solid wastes undergoes the following pretreatment:

[0107] Anhydrous ethanol and distilled water were mixed in a mass ratio of 60:1, the pH was adjusted to 3, 6.7% of hexadecyltrimethoxysilane was added, and the mixture was stirred at room temperature to obtain a spray liquid. The spray liquid was evenly sprayed on the multi-solid waste ceramsite and allowed to stand at room temperature for 24 hours. The mass ratio of the spray liquid to the multi-solid waste ceramsite was 0.2:1.

[0108] Example 10: An environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes. The difference from Example 7 is that the ceramsite from multiple solid wastes undergoes the following pretreatment:

[0109] Sodium chloride was dissolved in deionized water to prepare a 20 wt% sodium chloride solution, sodium lauryl sulfate was added, and the mixture was mixed to obtain a soaking solution, wherein the mass ratio of sodium lauryl sulfate to sodium chloride was 0.025:1;

[0110] Add the solid waste ceramsite into the soaking solution, soak at 45℃ for 5h, filter and dry.

[0111] Example 11: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 7 is that the anti-stripping agent is modified polyester fiber, and the modified polyester fiber is prepared by Preparation Example 5.

[0112] Example 12: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 7 is that the anti-stripping agent is modified polyester fiber, and the modified polyester fiber is prepared by Preparation Example 6.

[0113] Example 13: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 11 is that the modified polyester fiber is made from Preparation Example 7.

[0114] Example 14: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 11 is that the modified polyester fiber is made from Preparation Example 8.

[0115] Example 15: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 11 is that the modified polyester fiber is made from Preparation Example 9.

[0116] Example 16: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 11 is that the modified polyester fiber is made from Preparation Example 10.

[0117] Example 17: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 15 is that the modified polyester fiber is made from Preparation Example 11.

[0118] Example 18: An environmentally friendly rubber asphalt material prepared by co-production of multiple solid wastes. The difference from Example 15 is that the modified polyester fiber is made from Preparation Example 12.

[0119] Comparative Example

[0120] Comparative Example 1: An environmentally friendly rubber asphalt material prepared by synergistically preparing multiple solid wastes. The difference from Example 1 is that an equal amount of filled ceramsite is used to replace the multiple solid waste ceramsite. The filled ceramsite is a commercially available product selected from Anhui Changcai Energy Saving Technology. The material is shale, clay and rice husk, with a particle size of 5-15 mm and an apparent density of 750 kg / m 3 , bulk density is 450kg / m 3, water absorption rate is 13%, porosity is 40%, and cylinder pressure strength is 2.5MPa.

[0121] Performance testing

[0122] The rubber asphalt material was prepared according to the methods in the examples and comparative examples, and the performance was tested according to the following methods. The test results are recorded in Table 5.

[0123] 1. Dynamic stability: Tested in accordance with the standard method specified in JTJ052-2000 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0124] 2. Dynamic modulus: Tested in accordance with ASTM D7552-22 "Standard Test Method for Composite Shear Modulus of Asphalt Mixtures Using Dynamic Shear Rheometer".

[0125] 3. Permeability coefficient: Test in accordance with CJJ / T135-200 "Technical Specifications for Permeable Cement Concrete Pavement".

[0126] 4. Low temperature resistance: -10°C was selected as the freeze-thaw temperature. Four parallel specimens were set for each embodiment or comparative example. The specimens were 63.5 mm in height and 101.6 mm in diameter. The rubber asphalt material was mixed evenly and then cooled and cured at room temperature for at least 12 hours. The prepared specimens were cut and the specimens were 30.5 mm in thickness and 101.6 mm in diameter. In order to better simulate the state of the rubber asphalt pavement being immersed in water in winter, the specimens were immersed in salt water and clean water at room temperature and pressure until the mass of the specimens no longer changed. The saturation time of the specimen is set to 100h; the specimen is placed in a plastic bag and injected with 10mL of Qingshui River saline solution, frozen in a low-temperature box at -20℃ for 13h, then the plastic bag is removed and placed in a 40℃ water bath to thaw for 11h, which is one freeze-thaw cycle, and a total of 8 freeze-thaw cycles are performed; after the freeze-thaw cycle is completed, the specimen is placed in a dry and ventilated place, dried at room temperature for 24h, and then placed in a low-temperature box for no less than 4h, the temperature is controlled at -10℃, loaded at a speed of 5mm / min, the test force and deformation measurement accuracy is ±1%, and the ultimate load is tested.

[0127] Table 4 Performance test of environmentally friendly rubber asphalt materials

[0128]

[0129]

[0130] Combining the data in Table 4 with Examples 1-4, it can be seen that the multi-solid waste ceramsite prepared by Preparation Example 1 and Preparation Example 2 can be made into rubber asphalt materials with high water permeability, high dynamic stability, large dynamic modulus, and strong rutting resistance and crack resistance.

[0131] In Example 5 and Example 6, the multi-solid waste ceramsite prepared in Preparation Example 3 and Preparation Example 4 was used respectively. Compared with Preparation Example 1, stone powder was used instead of sawdust, and no white cloud tailings were added. The data in Table 4 show that although the water permeability coefficient of the rubber asphalt materials prepared in Example 5 and Example 6 is increased, the dynamic stability is reduced, the dynamic modulus is decreased, and the anti-rutting ability and anti-cracking effect are deteriorated.

[0132] Compared with Example 1, Examples 7 and 8 use sodium chloride, sodium lauryl sulfate, etc. to pretreat the multi-solid waste ceramsite. It can be seen that after the freeze-thaw cycle of the rubber asphalt material under clear water conditions, the ultimate load is stronger than that of Example 1. However, due to the addition of sodium chloride, its ultimate load in the brine solution decreases due to the corrosion of the brine solution.

[0133] Compared with Example 7, Example 9 does not load sodium chloride in the multi-solid waste expanded clay. It can be seen that after 8 freeze-thaw cycles in clean water, the ultimate load increases, while the ultimate load in saline solution increases, indicating that sodium chloride can improve the anti-icing effect of rubber asphalt materials at low temperatures.

[0134] Compared with Example 7, Example 10 does not add hexadecyltrimethoxysilane. The data in Table 4 show that the water permeability coefficient of the rubber asphalt material prepared in Example 10 is reduced, and the ultimate load is reduced after the fresh water freezing cycle. The ultimate load in the saline solution also decreases, indicating that hexadecyltrimethoxysilane can increase the hydrophobicity of the rubber asphalt, reduce water retention, and reduce crystallization expansion.

[0135] Compared with Example 7, Example 11 and Example 12 also use the modified polyester fibers prepared in Preparation Examples 5 and 6 as anti-stripping agents. It can be seen that the dynamic stability and dynamic modulus of the asphalt materials prepared in Example 11 and Example 12 are increased, the water permeability coefficient is higher, the water permeability is stronger, and the freeze-thaw resistance and anti-icing effects are improved.

[0136] In Example 13, the modified polyester fiber prepared in Preparation Example 7 was used. Compared with Example 11, no silane-modified silica particles were added. The freeze-thaw resistance of the rubber asphalt material prepared in Example 13 was reduced, and the dynamic stability and dynamic modulus were reduced, indicating that silane-modified silica particles can improve the mechanical strength and anti-seepage and anti-freeze effects of the rubber asphalt material.

[0137] Example 14 uses the modified polyester fiber prepared in Preparation Example 8. Compared with Example 11, the silica particles are not treated with silane. The tensile stability and dynamic modulus of the rubber asphalt material prepared in Example 14 are slightly weakened, the permeability coefficient is reduced, and the anti-freeze-thaw effect is reduced.

[0138] Compared with Example 11, Examples 15 and 16 respectively use the modified polyester fibers prepared in Preparation Examples 9 and 10, and the silane-modified silica particles are modified silica phase change capsules. As can be seen from the data in Table 4, the materials prepared in Examples 15 and 16 have excellent anti-freezing effects and can reduce strength loss in freeze-thaw environments.

[0139] In Example 17, the modified polyester fiber prepared in Preparation Example 11 was used without adding tetrabutyl titanate. It can be seen that compared with Example 15, the strength of the rubber asphalt material prepared in Example 17 is reduced and the anti-freeze-thaw effect is weakened.

[0140] In Example 18, the modified polyester fiber prepared in Preparation Example 12 was used. Compared with Example 15, the clear water and salt water ultimate loads of the asphalt material were both reduced, indicating that silica can improve the anti-freeze-thaw effect compared with the capsule.

[0141] Comparative Example 1 uses commercially available expanded clay to replace solid waste expanded clay. It can be seen that the dynamic stability of the rubber asphalt material prepared in Comparative Example 1 decreases, the dynamic modulus decreases, the permeability coefficient is higher, and the antifreeze effect becomes worse.

[0142] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes, characterized in that: The invention comprises the following raw materials in parts by weight: 100-140 parts of SBS modified asphalt, 15-25 parts of waste rubber powder, 0.5-1 part of SBR, 1-3 parts of stabilizer, 1.5-3 parts of anti-stripping agent, 30-50 parts of multi-solid waste ceramsite, 10-14 parts of aromatic oil, and 5-15 parts of tackifier; The waste rubber powder is made by mixing and crushing waste tires and EPDM rubber in a mass ratio of 1:0.3-0.5; The multi-solid waste ceramsite is prepared by adding water to solid waste raw materials to form a wet material, then granulating, drying, preheating at 340-350° C. for 20-30 minutes, and sintering at 1050-1100° C. for 20-30 minutes. The solid waste raw materials include copper tailings, domestic waste incineration fly ash, Baiyun tailings and sawdust in a mass ratio of 9:1:0.25-0.5:0.6-1. The chemical composition of the copper tailings is as follows: 22.89wt% SiO2, 5.01wt% Al2O3, 23.93wt% CaO, 27.34wt% Fe2O3, 5.99wt% MgO, 0.78wt% KO2, 0.79wt% %NaO2, 0.22wt%TiO2, 13.05wt%Other, LOI is 1.3wt%; the main chemical components of Baiyun tailings are as follows: 14.8wt%TFe, 2.79wt%FeO, 12.43wt%SiO2, 23.93wt%CaO, 2.78wt%MgO, 0.74wt%Al2O3, 0.43wt%K2O, 1.31wt%NaO2, 13.17wt%F, 0.58wt%TiO2, 1.46wt%P, the dioxin content in the fly ash from the incineration of domestic waste is ≤10ng-TEQ / kg.

2. The environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes according to claim 1, characterized in that: The preparation method of the multi-solid waste ceramsite is as follows: The copper tailings are mixed evenly with waste incineration fly ash, Baiyun tailings and sawdust to obtain solid waste raw materials; Adding 20-30 wt% of water to the solid waste raw material and mixing them evenly to form a wet material; Granulating the wet material to obtain raw balls with a particle size of 5-9 mm; The raw material balls are dried at 100-110° C. for 4-5 hours, then preheated at 340-350° C. for 20-30 minutes, and sintered at 1050-1100° C. for 20-30 minutes to prepare the multi-solid waste ceramsite.

3. The environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes according to claim 2, characterized in that: The multi-solid waste ceramsite is pretreated as follows: Sodium chloride is dissolved to prepare a sodium chloride solution with a concentration of 15-20 wt%, sodium lauryl sulfate is added, and mixed evenly to obtain a soaking solution, wherein the mass ratio of sodium lauryl sulfate to sodium chloride is 0.015-0.025:1; Adding the solid waste ceramsite into the soaking solution, soaking at 35-45°C for 5-7 hours, filtering and drying to obtain the salt-loaded ceramsite; Anhydrous ethanol and distilled water are mixed in a mass ratio of 55-60:1, the pH is adjusted to 2-3, 6.5-6.7% of hexadecyltrimethoxysilane is added, and the mixture is stirred at room temperature to obtain a spray liquid. The spray liquid is evenly sprayed on the salt-loaded ceramsite and allowed to stand at room temperature for 20-24 hours. The mass ratio of the spray liquid to the salt-loaded ceramsite is 0.1-0.2:

1.

4. The environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes according to claim 1, characterized in that: The anti-stripping agent is hydrophobically modified polyester fiber.

5. The environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes according to claim 4, characterized in that: The preparation method of the hydrophobically modified polyester fiber: The silane-modified silica particles were mixed with butyl acetate, and ultrasonically dispersed for 20-30 minutes. Polyurea resin and curing agent were added, and the mixture was stirred to obtain a treatment solution. The treatment liquid is sprayed on the polyester fiber, and dried at 80-85° C. for 8-10 hours to obtain the modified polyester fiber.

6. The environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes according to claim 5, characterized in that: The mass ratio of the silane-modified silica particles, butyl acetate, polyurea resin and curing agent is 3-4:8-9:2-3:1-1.5; the mass ratio of the treatment liquid to the polyester fiber is 0.1-0.3:

1.

7. The environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes according to claim 5, characterized in that: Preparation method of the silane-modified silica particles: Anhydrous ethanol and deionized water were mixed, and glacial acetic acid was added to prepare a mixed solution A; anhydrous ethanol, silica phase change capsules and tetrabutyl titanate were mixed to prepare a solution B; Add solution B to solution A, react at 200-220°C for 20-24 hours, centrifuge, wash, dry, and calcine at 450-500°C for 2-3 hours to obtain modified silica phase change capsules; Anhydrous ethanol, toluene and perfluorooctyltriethoxysilane were mixed, the pH was adjusted to 9, modified silica phase change capsules were added, ultrasonicated for 20-30 minutes, stirred at 60-65° C. for 5-6 hours, centrifuged, washed and dried to obtain silane-modified silica particles.

8. The environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes according to claim 7, characterized in that: The wall material of the silica phase change capsule is silica, and the core material is tetradecane.

9. The environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes according to claim 1, characterized in that: The tackifier is selected from at least one of petroleum resin, liquid coumarone, terpene resin and rosin resin.

10. The process for preparing the environmentally friendly rubber asphalt material prepared by synergistically using multiple solid wastes according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing SBS modified asphalt and aromatic oil, heating to 160-170° C., adding waste rubber, mixing and stirring for 30-40 minutes to prepare a binder; The binder temperature is maintained at 160-170° C., and solid waste ceramsite, stabilizer, anti-stripping agent and tackifier are added, mixed and stirred for 40-60 minutes to obtain an environmentally friendly rubber asphalt material.

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