Basalt fiber reinforced asphalt mixture based on solid waste synergy and preparation method of basalt fiber reinforced asphalt mixture

Abstract

The invention discloses a basalt fiber reinforced asphalt mixture based on solid waste synergy and a preparation method of the basalt fiber reinforced asphalt mixture, and belongs to the field of asphalt mixtures. The basalt fiber reinforced asphalt mixture based on solid waste synergy is prepared from the following raw material components in parts by mass: 1000 to 1200 parts of aggregate, 3 to 5 parts of modified basalt fiber, 50 to 73 parts of waste rubber modified asphalt, 2 to 4.38 parts of amphiphilic epoxy resin, 0.7 to 1.5 parts of curing agent and 0.06 to 0.13 part of accelerant, the modified basalt fiber is obtained by modifying triethoxysilyl butyraldehyde, 3-mercaptopropyltrimethoxysilane and allyl-1, 3-sultone, and the modified basalt fiber is prepared by modifying the triethoxysilyl butyraldehyde, the 3-mercaptopropyltrimethoxysilane and the allyl-1, 3-sultone; the amphiphilic epoxy resin is obtained by reacting dodecyl succinic anhydride, polyethylene glycol monomethyl ether 2000 and epoxy resin; m-phenylenediamine and 2-amino-4-cyanopyridine are adopted as the curing agent; n-methylimidazole is adopted as the accelerant; the asphalt mixture prepared by the invention has good rut resistance, crack resistance and water stability.

Description

Technical Field

[0001] This invention relates to asphalt mixtures, specifically to basalt fiber reinforced asphalt mixtures based on solid waste synergy and their preparation method. Background Technology

[0002] With the rapid development of my country's transportation infrastructure, heavy-load traffic, high-frequency traffic, and complex environments have placed higher demands on the performance of asphalt pavement materials. Traditional asphalt mixtures have significant shortcomings in high-temperature stability, low-temperature crack resistance, water stability, and durability. Especially in sections with frequent heavy traffic, they are prone to early-stage defects such as rutting, cracking, and spalling, seriously affecting road service life and driving safety. To improve the overall performance of asphalt mixtures, fiber reinforcement technology has been widely researched and applied. Among them, basalt fiber has become a highly regarded reinforcing material in recent years due to its excellent mechanical properties, thermal stability, chemical inertness, and environmental friendliness. Studies have shown that basalt fiber can effectively improve the high-temperature rutting resistance, low-temperature crack resistance, and fatigue resistance of asphalt mixtures.

[0003] However, while pursuing higher quality roads, low-carbon and environmentally friendly practices have become crucial factors that cannot be ignored. In order to respond to the low-carbon development strategy, reduce carbon emissions, optimize resource utilization efficiency, and improve the sustainability of road construction, integrating low-carbon concepts into the improvement of asphalt mixtures is particularly important. For example, using basalt fiber can not only significantly improve the physical properties of asphalt mixtures, but its production process is also more energy-efficient and reduces consumption compared to traditional materials, thus helping to lower the overall carbon footprint.

[0004] Existing basalt fiber reinforced asphalt mixtures still face several technical bottlenecks: on the one hand, basalt fibers tend to agglomerate and have poor dispersibility in the asphalt matrix, resulting in insufficient interfacial bonding and limiting their full reinforcement effect; on the other hand, single-fiber modification is difficult to achieve synergistic improvement of various road performance characteristics. Meanwhile, the large-scale stockpiling of industrial solid wastes such as steel slag not only occupies land resources but also poses environmental pollution risks. However, by rationally utilizing these solid waste materials, such as using them as fillers or partially replacing traditional aggregates, we can not only reduce the extraction of natural resources but also lower energy consumption and carbon dioxide emissions, promoting the recycling of building materials.

[0005] For example, steel slag has high hardness and wear resistance, which can enhance the stability of the mixture skeleton. At the same time, since it comes from industrial waste, the use of steel slag helps to reduce the environmental burden and promote the development of a low-carbon economy.

[0006] Therefore, there is an urgent need to develop a basalt fiber reinforced asphalt mixture based on solid waste synergy and its preparation method, so as to achieve a synergistic improvement in the rutting resistance, crack resistance and water stability of the basalt fiber reinforced asphalt mixture, while also emphasizing that while ensuring road quality, it is in line with the current green and low-carbon trend of social development. Summary of the Invention

[0007] The purpose of this invention is to provide a basalt fiber-reinforced asphalt mixture based on solid waste synergy and its preparation method, so as to solve the technical problems mentioned in the background art.

[0008] The technical solution to achieve the objective of this invention is: In a first aspect, the present invention provides a basalt fiber reinforced asphalt mixture based on solid waste synergy, wherein, by mass parts, the raw material components include 1000-1200 mass parts of aggregate, 3-5 mass parts of modified basalt fiber, 50-73 mass parts of waste rubber modified asphalt, 2-4.38 mass parts of amphiphilic epoxy resin, 0.7-1.5 mass parts of curing agent, and 0.06-0.13 mass parts of accelerator.

[0009] Furthermore, the modified basalt fiber is obtained by modifying basalt fiber with triethoxysilylbutyraldehyde, 3-mercaptopropyltrimethoxysilane, and propenyl-1,3-sulfonyl lactone.

[0010] Furthermore, the amphiphilic epoxy resin is obtained by reacting dodecyl succinic anhydride, polyethylene glycol monomethyl ether 2000, and epoxy resin.

[0011] Furthermore, the curing agent is obtained by combining m-phenylenediamine and 2-amino-4-cyanopyridine in a molar ratio of (2.5~3.5):(1.5~2.5).

[0012] Furthermore, the promoter is N-methylimidazole.

[0013] In a second aspect, the present invention provides a method for preparing basalt fiber reinforced asphalt mixture as described in the first aspect, comprising the following preparation steps: (1) Weigh and prepare each raw material component; (2) Weigh the modified basalt fiber and mix it with acetone at a mass-to-volume ratio of 1g:15~25mL, then ultrasonically disperse for 10~20min to obtain an acetone dispersion of the modified basalt fiber; mix the weighed amphiphilic epoxy resin, curing agent and accelerator evenly, then heat to 90~110℃ for 55~65min, then heat to 110~130℃ for 110~130min, then cool to 50~80℃ and add The aforementioned modified basalt fiber acetone dispersion was mixed evenly and reacted for 1-3 days. After removing the acetone by vacuum drying, 0.03-0.08 parts by mass of concentrated sulfuric acid were added at room temperature. The temperature was raised to 40-80℃ and reacted for 1-3 days. Then, deionized water was added dropwise while stirring at 2000-3000 r / min. After the addition was complete, shearing was continued for 15-25 min to obtain an epoxy resin emulsion with a solid content of 48-52%. The emulsion was kept at 60-70℃ for later use. (3) Heat the waste rubber modified asphalt at 175~185℃ to a molten state to obtain molten waste rubber modified asphalt; pour boiling water into the colloid mill, circulate for 55~65s and then release the water to obtain a preheated colloid mill; pour epoxy resin emulsion into the preheated colloid mill and circulate for 25~35s, then pour in the molten waste rubber modified asphalt. After the waste rubber modified asphalt is completely added, shear it in the colloid mill for 2~7min, and then cool it in a room temperature water bath to obtain emulsified asphalt. (4) After mixing the aggregate in a mixer for 2-3 minutes, heat it to 150-180℃. Add emulsified asphalt under the mixing condition, keep it warm and mix for 45-60 minutes, and then store it in a heat preservation box at 150-180℃ to obtain basalt fiber reinforced asphalt mixture.

[0014] Further, the preparation method of the amphiphilic epoxy resin is as follows: 17-18 parts by weight of polyethylene glycol monomethyl ether 2000 and 2-3 parts by weight of dodecyl succinic anhydride are heated at 95-105°C for 30-60 min and stirred for 160-200 min. After cooling to room temperature, 80 parts by weight of epoxy resin E51 and 0.21-0.23 parts by weight of triphenylphosphine are added, and the mixture is heated to 115-125°C and reacted for 160-200 min to obtain the amphiphilic epoxy resin.

[0015] Further, the preparation steps of the modified basalt fiber are as follows: Basalt fiber is placed in acetone solution at a material-to-liquid ratio of 1g:15-25mL, ultrasonically washed and dispersed at 20-30℃ for 15-25min, then filtered. The obtained solid is repeatedly washed and filtered 2-4 times with deionized water. Then, it is added to 3M hydrochloric acid solution at 58-62℃ at a mass-to-volume ratio of 1g:15-25mL, ultrasonically washed for 50-70min, and then filtered. The solid is repeatedly washed and filtered 2-4 times with deionized water and dried to obtain acidified basalt fiber. 11-12 parts by mass of triethoxysilylbutyraldehyde and 10-11 parts by mass of 3-mercaptopropyltrimethoxysilane are added to 400 parts by mass of anhydrous ethanol and stirred at 20-30℃ for 55-65min to obtain silane hydrolysate. Acidified basalt fibers were added to a silane hydrolysate at a mass-to-volume ratio of 1 g: 15-25 mL and stirred for 55-65 min. The solid was then filtered and repeatedly washed with deionized water, filtered 2-4 times, and dried to obtain pre-modified basalt fibers. Under argon protection, the pre-modified basalt fibers were placed in an acetone solution at a material-to-liquid ratio of 1 g: 15-25 mL and ultrasonically washed and dispersed at 20-30°C for 15-25 min. Then, 1.9-2 parts by mass of propylene-1,3-sulfonyl lactone and 0.1-0.11 parts by mass of benzoin dimethyl ether were added and stirred for 20-40 min. The reaction was then continued under ultraviolet light for 15-25 min. After the reaction was completed, the mixture was filtered, washed 2-4 times with n-hexane, filtered again, and vacuum dried to constant weight to obtain modified basalt fibers.

[0016] Further, the preparation steps of the waste rubber modified asphalt are as follows: 600-700 parts by weight of base asphalt are placed in an oven at 134-136℃ and fully melted. Then, 96-180 parts by weight of desulfurized waste tire rubber powder are added. The mixture is then sheared at 175-185℃ for 15-25 minutes at a shear rate of 2000-3000 r / min. Then, 0.6-0.7 parts by weight of stabilizer sulfur are added, and shearing continues for 15-25 minutes. Finally, the mixture is stirred and developed at 175-185℃ and 1000 r / min for 1.5-2.5 hours to obtain waste rubber modified asphalt.

[0017] Furthermore, the aggregate is composed of coarse aggregate, fine aggregate and mineral powder in a weight ratio of 4~5:1~2:1, the particle size of the coarse aggregate is 10~20mm, the particle size of the fine aggregate is 2~8mm; the mineral powder is limestone powder with a particle size of less than 2mm and steel slag combined in a mass ratio of 1:1.

[0018] By adopting the above technical solution, the present invention has the following beneficial effects: (1) The basalt fiber reinforced asphalt mixture based on solid waste synergy prepared by the present invention includes aggregate, modified basalt fiber, waste rubber modified asphalt, amphiphilic epoxy resin, curing agent and accelerator. Among them, the use of waste rubber modified asphalt not only improves the elasticity and toughness of asphalt and alleviates temperature sensitivity, but also realizes the high-value utilization of waste tire resources and reduces carbon emissions. The asphalt mixture prepared can significantly improve the rutting resistance, crack resistance and water stability while maintaining excellent road performance, and at the same time has low carbon and environmental protection characteristics.

[0019] (2) The modified basalt fiber of the present invention is obtained by modifying basalt fiber with triethoxysilylbutyraldehyde, 3-mercaptopropyltrimethoxysilane and propylene-1,3-sulfonyl lactone. First, triethoxysilylbutyraldehyde and 3-mercaptopropyltrimethoxysilane modify the surface of basalt fiber by reacting siloxane with the hydroxyl groups on acidified basalt fiber. Then, using mercapto-olefin click chemistry, propylene-1,3-sulfonyl lactone is efficiently grafted onto the fiber surface. The sulfonic acid groups strengthen the chemical adsorption of aggregate and polar asphalt components, and synergistically improve the interfacial bonding strength. The resulting three-dimensional network structure can effectively inhibit asphalt flow at high temperature and improve rutting resistance. At the same time, under low temperature or load, the modified basalt fiber bridges and delays crack propagation, thereby enhancing crack resistance.

[0020] (3) The amphiphilic epoxy resin of the present invention is obtained by reacting dodecyl succinic anhydride, polyethylene glycol monomethyl ether 2000 and epoxy resin. First, dodecyl succinic anhydride undergoes a ring-opening esterification reaction with the terminal hydroxyl group of polyethylene glycol monomethyl ether 2000 to generate an intermediate product containing ester bonds and free carboxyl groups. Subsequently, the carboxyl group in the intermediate product undergoes a ring-opening addition reaction with some epoxy groups in the epoxy resin molecule to combine the hydrophobic long alkyl chain in dodecyl succinic anhydride and the hydrophilic polyethylene glycol in polyethylene glycol monomethyl ether 2000. The functional structure of the chain segment is grafted onto the epoxy resin backbone to obtain an epoxy resin with amphiphilic properties. The hydrophilic end enhances the chemical adsorption with the polar groups on the surface of aggregates and fibers, while the hydrophobic end is well miscible with asphalt, significantly improving the interfacial bonding strength. Subsequently, under the action of curing agent and accelerator, the remaining epoxy groups further crosslink to form a three-dimensional network, which not only strengthens the high-temperature stability of asphalt mixtures and further improves rutting resistance, but also further inhibits the initiation and propagation of cracks under low temperature or load, thus enhancing crack resistance.

[0021] (4) In the preparation process of the basalt fiber reinforced asphalt mixture of the present invention, modified basalt fiber, amphiphilic epoxy resin, curing agent and accelerator are first mixed. The curing agent adopts a composite system of m-phenylenediamine and 2-amino-4-cyanopyridine, and the accelerator is N-methylimidazole. Under the action of curing agent and accelerator, the remaining epoxy groups of amphiphilic epoxy resin are further cross-linked to form a three-dimensional network. The propylene-1,3-sulfonyl lactone grafted on the surface of modified basalt fiber undergoes a ring-opening reaction with the accelerator N-methylimidazole to generate 1-propylsulfonic acid-3-methylimidazole inner salt type ionic liquid in situ. Under the catalytic action of 1-propylsulfonic acid-3-methylimidazole inner salt type ionic liquid, the cyano group of 2-amino-4-cyanopyridine in the curing agent undergoes a cycloaddition reaction with the aldehyde group on the surface of modified basalt fiber. The process generates triazine structures, forming an epoxy resin network with hyperbranched topological features centered on these triazine structures. The resulting cavities within the epoxy resin network facilitate the embedding and anchoring of asphalt molecules during subsequent mixing with asphalt, enhancing the compatibility and interfacial bonding between the asphalt and resin networks. Furthermore, it significantly improves the overall cohesive strength and structural stability of the asphalt binder, effectively enhancing the mixture's resistance to rutting and cracking. Simultaneously, the nitrogen atoms on the pyridine rings in the epoxy resin network can form stable coordination complexes with free metal ions released from steel slag in the aggregate, further strengthening the chemical bonding and physical anchoring at the asphalt-aggregate interface. This optimizes the density and mechanical properties of the interfacial transition zone, further improving the high-temperature stability, low-temperature crack resistance, and water stability of the asphalt mixture.

[0022] (5) The aggregate of the present invention is composed of coarse aggregate, fine aggregate and mineral powder. The coarse mineral powder is obtained by combining limestone powder and steel slag. Steel slag has high hardness, high angularity and excellent wear resistance, which can enhance the skeleton interlocking effect and improve the rutting resistance of the mixture under high temperature and heavy load conditions. At the same time, its potential hydraulic activity helps to improve the long-term stability of the interface between asphalt and aggregate, thereby improving water stability. Limestone powder has good oleophilicity and filling effect, which can effectively fill the voids, improve the rheological properties of asphalt mortar, and form a strong physicochemical adsorption with asphalt, further enhancing the interfacial adhesion. Combining limestone powder and steel slag to form mineral powder, while giving full play to their respective advantages, achieves a balance between rigid support and flexible bonding, which helps to suppress low temperature shrinkage cracking and improve crack resistance. In addition, steel slag, as a typical industrial solid waste, reduces the pollution of natural mineral mining and landfill by its resource utilization, significantly reduces carbon emissions in the material production process, and makes the mixture have low-carbon and environmentally friendly characteristics while maintaining excellent road performance. Detailed Implementation

[0023] To better understand the above technical solution, the following will provide a detailed explanation of the technical solution in conjunction with specific implementation methods.

[0024] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0025] The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0026] Polyethylene glycol monomethyl ether 2000: melting point 50~55℃, average relative molecular mass 2000, Shanghai Maclean Biochemical Technology Co., Ltd.

[0027] The epoxy resin used is epoxy resin E51, manufactured by Nantong Xingchen Synthetic Materials Co., Ltd.

[0028] Basalt fiber: average length 6mm, average diameter 17μm, oil absorption rate 1.26 times, density 2.65g / cm³ 3 It has a moisture content of 0.08% and a tensile strength of 1256 MPa.

[0029] Waste tire rubber powder: particle size 80 mesh, density 0.42 g / cm³ 3 .

[0030] Base bitumen: Penetration (25℃, 100g, 5s) is 70 (0.1mm); softening point (5℃, ring and ball method) is 47℃; ductility (10℃) is 76cm; dynamic viscosity at 60℃ is 230Pa·s; flash point is 310℃.

[0031] The desulfurizing agent is a thiophenol compound produced by Dongying Yupeng Chemical Co., Ltd.

[0032] The preparation steps of desulfurized waste tire rubber powder are as follows: Add 100 parts by weight of waste tire rubber powder and 10 parts by weight of furfural extract oil to a sealed container, mix evenly at room temperature, then add 5 parts by weight of dodecyl mercaptan and 5 parts by weight of lauric acid, mix evenly to obtain a preliminary mixture; heat the preliminary mixture to 100℃, stir at 600 r / min for 30 min to obtain a mixed rubber compound; finally, melt-extrude the mixed rubber compound using a conical twin-screw extruder, controlling the screw speed at 80 r / min, the barrel temperature at 220℃, and the extrusion time at 15 min, and then pelletize after extrusion to obtain desulfurized waste tire rubber powder.

[0033] Example 1 The preparation method of basalt fiber-reinforced asphalt mixture based on solid waste synergy includes the following preparation steps: (1) Weigh and prepare each raw material component according to the following mass parts: 1000 mass parts aggregate, 3 mass parts modified basalt fiber, 50 mass parts waste rubber modified asphalt, 2 mass parts amphiphilic epoxy resin, 0.7 mass parts curing agent, and 0.06 mass parts accelerator. (2) Weigh the modified basalt fiber and mix it with acetone at a mass-volume ratio of 1g:15mL, and then ultrasonically disperse it for 10min to obtain the acetone dispersion of the modified basalt fiber; Weigh the amphiphilic epoxy resin, curing agent and accelerator and mix them evenly, then heat it to 90℃ for 55min, then heat it to 110℃ for 110min, then cool it down to 50℃ and add the aforementioned acetone dispersion of the modified basalt fiber and mix it evenly. After reacting for 1 day, vacuum dry to remove acetone and add 0.03 parts by mass of concentrated sulfuric acid at room temperature, heat it to 40℃ and react for 1 day, then add deionized water dropwise under stirring at 2000r / min speed. After the addition is complete, continue to shear for 15min to obtain an epoxy resin emulsion with a solid content of 48%, and keep it warm at 60℃ for later use. (3) Heat the waste rubber modified asphalt to a molten state at 175℃ to obtain molten waste rubber modified asphalt; pour boiling water into the colloid mill, circulate for 55s and then release the water to obtain a preheated colloid mill; pour epoxy resin emulsion into the preheated colloid mill and circulate for 25s, then pour in the molten waste rubber modified asphalt. After the waste rubber modified asphalt is completely added, shear it in the colloid mill for 2min, and then cool it in a room temperature water bath to obtain emulsified asphalt. (4) After mixing the aggregate in a mixer for 2 minutes, heat it to 150°C. Add emulsified asphalt under the mixing condition, keep it warm and mix for 45 minutes, and then store it in a 150°C heat preservation box to obtain basalt fiber reinforced asphalt mixture.

[0034] The preparation method of amphiphilic epoxy resin is as follows: 17 parts by mass of polyethylene glycol monomethyl ether 2000 and 2 parts by mass of dodecyl succinic anhydride are heated at 95°C for 30 min and stirred for 160 min. After cooling to room temperature, 80 parts by mass of epoxy resin E51 and 0.21 parts by mass of triphenylphosphine are added, and the mixture is heated to 115°C and reacted for 160 min to obtain amphiphilic epoxy resin.

[0035] The preparation steps of modified basalt fiber are as follows: Basalt fiber is placed in acetone solution at a material-to-liquid ratio of 1g:15mL, ultrasonically washed and dispersed at 20℃ for 15min, then filtered. The obtained solid is repeatedly washed and filtered twice with deionized water. Then, it is added to 3M hydrochloric acid solution at 58℃ at a mass-to-volume ratio of 1g:15mL and ultrasonically filtered for 50min. The solid is then dried after repeated washing and filtration with deionized water to obtain acidified basalt fiber. 11 parts by mass of triethoxysilylbutyraldehyde and 10 parts by mass of 3-mercaptopropyltrimethoxysilane are added to 400 parts by mass of anhydrous ethanol and stirred at 20℃ for 55min to obtain silane hydrolysate. The acidified basalt fiber is then... Basalt fiber was added to silane hydrolysate at a mass-to-volume ratio of 1 g: 15 mL and stirred for 55 min. The solid was then filtered, washed repeatedly with deionized water, filtered twice, and dried to obtain pre-modified basalt fiber. Under argon protection, the pre-modified basalt fiber was placed in acetone solution at a material-to-liquid ratio of 1 g: 15 mL and ultrasonically washed and dispersed at 20°C for 15 min. Then, 1.9 parts by mass of propylene-1,3-sulfonyl lactone and 0.1 parts by mass of benzoin dimethyl ether were added and stirred for 20 min. The reaction was then continued under UV irradiation for 15 min. After the reaction was complete, the mixture was filtered, washed twice with n-hexane, filtered again, and vacuum dried to constant weight to obtain modified basalt fiber.

[0036] The preparation steps of waste rubber modified asphalt are as follows: 600 parts by mass of base asphalt are placed in an oven at 134℃ and melted completely. Then, 96 parts by mass of desulfurized waste tire rubber powder are added. The mixture is then sheared at 175℃ for 15 minutes at a shear rate of 2000 r / min. Next, 0.6 parts by mass of stabilizer sulfur are added, and shearing is continued for another 15 minutes. Finally, the mixture is stirred and developed at 175℃ and 1000 r / min for 1.5 hours to obtain waste rubber modified asphalt.

[0037] The aggregate consists of coarse aggregate, fine aggregate, and mineral powder in a weight ratio of 5:2:1. The coarse aggregate has a particle size of 10-20 mm, and the fine aggregate has a particle size of 2-8 mm. The mineral powder is a mixture of limestone powder with a particle size of less than 2 mm and steel slag in a mass ratio of 1:1.

[0038] The curing agent is obtained by combining m-phenylenediamine and 2-amino-4-cyanopyridine in a molar ratio of 2.5:2.5.

[0039] Example 2 The preparation method of basalt fiber-reinforced asphalt mixture based on solid waste synergy includes the following preparation steps: (1) Weigh and prepare each raw material component according to the following mass parts: 1100 mass parts aggregate, 4 mass parts modified basalt fiber, 62 mass parts waste rubber modified asphalt, 3.19 mass parts amphiphilic epoxy resin, 1.1 mass parts curing agent, and 0.1 mass parts accelerator; (2) Weigh the modified basalt fiber and mix it with acetone at a mass-volume ratio of 1g:20mL, and then ultrasonically disperse it for 15min to obtain the acetone dispersion of the modified basalt fiber; Weigh the amphiphilic epoxy resin, curing agent and accelerator and mix them evenly, then heat it to 100℃ for 60min, then heat it to 120℃ for 120min, then cool it down to 65℃ and add the aforementioned acetone dispersion of the modified basalt fiber and mix it evenly. After reacting for 2 days, vacuum dry to remove acetone and add 0.06 parts by mass of concentrated sulfuric acid at room temperature, heat it to 60℃ and react for 2 days, then add deionized water dropwise under stirring at 2500r / min speed. After the addition is complete, continue to shear for 20min to obtain an epoxy resin emulsion with a solid content of 50%, and keep it at 65℃ for later use. (3) Heat the waste rubber modified asphalt at 180°C to a molten state to obtain molten waste rubber modified asphalt; pour boiling water into the colloid mill, circulate for 60s and then release the water to obtain a preheated colloid mill; pour epoxy resin emulsion into the preheated colloid mill and circulate for 30s, then pour in the molten waste rubber modified asphalt. After the waste rubber modified asphalt is completely added, shear it in the colloid mill for 5 minutes, and then cool it in a room temperature water bath to obtain emulsified asphalt. (4) After mixing the aggregate in a mixer for 3 minutes, heat it to 180°C. Add emulsified asphalt under the mixing condition, keep it warm and mix for 60 minutes, and then store it in a 180°C heat preservation box to obtain basalt fiber reinforced asphalt mixture.

[0040] The preparation method of amphiphilic epoxy resin is as follows: 17.5 parts by mass of polyethylene glycol monomethyl ether 2000 and 2.5 parts by mass of dodecyl succinic anhydride are heated at 100℃ for 45 min and stirred for 180 min. After cooling to room temperature, 80 parts by mass of epoxy resin E51 and 0.22 parts by mass of triphenylphosphine are added, and the mixture is heated to 120℃ and reacted for 180 min to obtain amphiphilic epoxy resin.

[0041] The preparation steps of modified basalt fiber are as follows: Basalt fiber is placed in acetone solution at a material-to-liquid ratio of 1g:20mL, ultrasonically washed and dispersed at 25℃ for 20min, then filtered. The obtained solid is repeatedly washed and filtered three times with deionized water. Then, it is added to 3M hydrochloric acid solution at 60℃ at a mass-to-volume ratio of 1g:20mL and ultrasonically filtered for 60min. The solid is then dried after repeated washing and filtration with deionized water to obtain acidified basalt fiber. 11.5 parts by mass of triethoxysilylbutyraldehyde and 10.5 parts by mass of 3-mercaptopropyltrimethoxysilane are added to 400 parts by mass of anhydrous ethanol and stirred at 25℃ for 60min to obtain silane hydrolysate. The acidified basalt fiber is then added to acetone solution at a mass-to-liquid ratio of 1g:20mL and ultrasonically washed and dispersed at 25℃ for 20min. Basalt fiber was added to silane hydrolysate at a mass-to-volume ratio of 1 g: 20 mL and stirred for 60 min. The solid was then filtered, washed repeatedly with deionized water, filtered three times, and dried to obtain pre-modified basalt fiber. Under argon protection, the pre-modified basalt fiber was placed in acetone solution at a material-to-liquid ratio of 1 g: 20 mL and ultrasonically washed and dispersed at 25°C for 20 min. Then, 1.95 parts by mass of propylene-1,3-sulfonyl lactone and 0.105 parts by mass of benzoin dimethyl ether were added, stirred for 30 min, and then stirred and reacted under ultraviolet light for another 20 min. After the reaction was complete, the mixture was filtered, washed three times with n-hexane, filtered again, and vacuum dried to constant weight to obtain modified basalt fiber.

[0042] The preparation steps of waste rubber modified asphalt are as follows: 650 parts by mass of base asphalt are placed in an oven at 135℃ and melted completely. Then, 140 parts by mass of desulfurized waste tire rubber powder are added, and the mixture is sheared at 180℃ for 20 minutes at a shear rate of 2500 r / min. Then, 0.65 parts by mass of stabilizer sulfur are added, and shearing is continued for another 20 minutes. Finally, the mixture is stirred and developed at 180℃ and 1000 r / min for 2 hours to obtain waste rubber modified asphalt.

[0043] The aggregate consists of coarse aggregate, fine aggregate, and mineral powder in a weight ratio of 4.5:1.5:1. The coarse aggregate has a particle size of 10~20mm, and the fine aggregate has a particle size of 2~8mm. The mineral powder is limestone powder with a particle size of less than 2mm and steel slag combined in a mass ratio of 1:1.

[0044] The curing agent is obtained by combining m-phenylenediamine and 2-amino-4-cyanopyridine in a molar ratio of 3:2.

[0045] Example 3 The preparation method of basalt fiber-reinforced asphalt mixture based on solid waste synergy includes the following preparation steps: (1) Weigh and prepare each raw material component according to the following mass parts: 1200 mass parts aggregate, 5 mass parts modified basalt fiber, 73 mass parts waste rubber modified asphalt, 4.38 mass parts amphiphilic epoxy resin, 1.5 mass parts curing agent, and 0.13 mass parts accelerator; (2) The weighed modified basalt fiber and acetone were mixed at a mass-volume ratio of 1g:25mL, and then ultrasonically dispersed for 20min to obtain an acetone dispersion of modified basalt fiber; the weighed amphiphilic epoxy resin, curing agent and accelerator were mixed evenly, and then heated to 110℃ for 65min, then heated to 130℃ for 130min, and then cooled to 80℃ and added the aforementioned acetone dispersion of modified basalt fiber and mixed evenly. After reacting for 3 days, the acetone was removed by vacuum drying and 0.08 parts by mass of concentrated sulfuric acid was added at room temperature, and the temperature was raised to 80℃ for 3 days. Then, deionized water was added dropwise under stirring at 3000r / min. After the addition was completed, shearing was continued for 25min to obtain an epoxy resin emulsion with a solid content of 52%, which was kept warm at 70℃ for later use. (3) Heat the waste rubber modified asphalt at 185°C to a molten state to obtain molten waste rubber modified asphalt; pour boiling water into the colloid mill, circulate for 65s and then release the water to obtain a preheated colloid mill; pour epoxy resin emulsion into the preheated colloid mill and circulate for 35s, then pour in the molten waste rubber modified asphalt. After the waste rubber modified asphalt is completely added, shear it in the colloid mill for 7min, and then cool it in a room temperature water bath to obtain emulsified asphalt. (4) After mixing the aggregate in a mixer for 3 minutes, heat it to 180°C. Add emulsified asphalt under the mixing condition, keep it warm and mix for 60 minutes, and then store it in a 180°C heat preservation box to obtain basalt fiber reinforced asphalt mixture.

[0046] The preparation method of amphiphilic epoxy resin is as follows: 18 parts by mass of polyethylene glycol monomethyl ether 2000 and 3 parts by mass of dodecyl succinic anhydride are heated at 105°C for 60 min and stirred for 200 min. After cooling to room temperature, 80 parts by mass of epoxy resin E51 and 0.23 parts by mass of triphenylphosphine are added, and the mixture is heated to 125°C for 200 min to obtain amphiphilic epoxy resin.

[0047] The preparation steps of modified basalt fiber are as follows: Basalt fiber is placed in acetone solution at a material-to-liquid ratio of 1g:25mL, ultrasonically washed and dispersed at 30℃ for 25min, then filtered. The obtained solid is repeatedly washed and filtered 4 times with deionized water. Then, it is added to 3M hydrochloric acid solution at 62℃ at a mass-to-volume ratio of 1g:25mL and ultrasonically filtered for 70min. The solid is then dried after repeated washing and filtration with deionized water to obtain acidified basalt fiber. 12 parts by mass of triethoxysilylbutyraldehyde and 11 parts by mass of 3-mercaptopropyltrimethoxysilane are added to 400 parts by mass of anhydrous ethanol and stirred at 30℃ for 65min to obtain silane hydrolysate. The acidified basalt fiber is then... Basalt fiber was added to silane hydrolysate at a mass-to-volume ratio of 1 g: 25 mL and stirred for 65 min. The solid was then filtered and repeatedly washed with deionized water, filtered four times, and dried to obtain pre-modified basalt fiber. Under argon protection, the pre-modified basalt fiber was placed in acetone solution at a material-to-liquid ratio of 1 g: 25 mL and ultrasonically washed and dispersed at 30 °C for 25 min. Then, 2 parts by mass of propylene-1,3-sulfonyl lactone and 0.11 parts by mass of benzoin dimethyl ether were added and stirred for 40 min. The reaction was then continued under ultraviolet light for 25 min. After the reaction was completed, the mixture was filtered, washed four times with n-hexane, filtered again, and vacuum dried to constant weight to obtain modified basalt fiber.

[0048] The preparation steps of waste rubber modified asphalt are as follows: 700 parts by mass of base asphalt are placed in an oven at 136℃ and melted completely. Then, 180 parts by mass of desulfurized waste tire rubber powder are added, and the mixture is sheared at 185℃ for 25 minutes at a shear rate of 3000 r / min. Then, 0.7 parts by mass of stabilizer sulfur are added, and shearing is continued for another 25 minutes. Finally, the mixture is stirred and developed at 185℃ and 1000 r / min for 2.5 hours to obtain waste rubber modified asphalt.

[0049] The aggregate consists of coarse aggregate, fine aggregate, and mineral powder in a weight ratio of 4:1:1. The coarse aggregate has a particle size of 10-20 mm, and the fine aggregate has a particle size of 2-8 mm. The mineral powder is limestone powder with a particle size of less than 2 mm and steel slag combined in a mass ratio of 1:1.

[0050] The curing agent is obtained by combining m-phenylenediamine and 2-amino-4-cyanopyridine in a molar ratio of 3.5:1.5.

[0051] Comparative Example 1 The only difference between Comparative Example 1 and Example 2 is that the raw material components, by mass parts, include: 1100 parts aggregate, 4 parts basalt fiber, 62 parts waste rubber modified asphalt, 3.19 parts amphiphilic epoxy resin, 1.1 parts curing agent, and 0.1 parts accelerator. The remaining components and steps are the same as in Example 2.

[0052] Comparative Example 2 The only difference between Comparative Example 2 and Example 2 is that the modified basalt fiber is obtained by modifying basalt fiber with silane coupling agent KH550. The other components and steps are the same as in Example 2.

[0053] Comparative Example 3 The only difference between Comparative Example 3 and Example 2 is that the modified basalt fiber is obtained by modifying basalt fiber with triethoxysilyl butyral; the other components and steps are the same as in Example 2.

[0054] Comparative Example 4 The only difference between Comparative Example 4 and Example 2 is that the modified basalt fiber is obtained by modifying basalt fiber with 3-mercaptopropyltrimethoxysilane and propenyl-1,3-sulfonyl lactone. The other components and steps are the same as in Example 2.

[0055] Comparative Example 5 The only difference between Comparative Example 5 and Example 2 is that the curing agent used is only m-phenylenediamine, while the other components and steps are the same as in Example 2.

[0056] Example of effect Table 1 below shows the performance test results of basalt fiber reinforced asphalt mixtures prepared in Examples 1-3 and Comparative Examples 1-5 according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011): Table 1

[0057] Table 1 shows that the basalt fiber reinforced asphalt mixtures prepared in Examples 1-3 have good rutting resistance, crack resistance, and water stability.

[0058] The only difference between Comparative Example 1 and Example 2 is that the basalt fiber was not modified, and the basalt fiber reinforced asphalt mixture prepared had weaker rutting resistance, crack resistance and water stability.

[0059] The only difference between Comparative Example 2 and Example 2 is that the modified basalt fiber is obtained by modifying basalt fiber with silane coupling agent KH550. The basalt fiber reinforced asphalt mixture has weaker rutting resistance, crack resistance and water stability.

[0060] The only difference between Comparative Example 3 and Example 2 is that the modified basalt fiber is obtained by modifying basalt fiber with triethoxysilyl butyral. The basalt fiber reinforced asphalt mixture has weaker rutting resistance, crack resistance and water stability.

[0061] The only difference between Comparative Example 4 and Example 2 is that the modified basalt fiber is obtained by modifying basalt fiber with 3-mercaptopropyltrimethoxysilane and propenyl-1,3-sulfonyl lactone. The basalt fiber reinforced asphalt mixture prepared by this method has weaker rutting resistance, crack resistance and water stability.

[0062] The only difference between Comparative Example 5 and Example 2 is that the basalt fiber reinforced asphalt mixture prepared by using only m-phenylenediamine as the curing agent has weaker rutting resistance, crack resistance, and water stability.

[0063] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A basalt fiber-reinforced asphalt mixture based on solid waste synergy, characterized in that, By mass, the raw material components include 1000-1200 parts aggregate, 3-5 parts modified basalt fiber, 50-73 parts waste rubber modified asphalt, 2-4.38 parts amphiphilic epoxy resin, 0.7-1.5 parts curing agent, and 0.06-0.13 parts accelerator.

2. The basalt fiber reinforced asphalt mixture according to claim 1, characterized in that, The modified basalt fiber is obtained by modifying basalt fiber with triethoxysilylbutyraldehyde, 3-mercaptopropyltrimethoxysilane, and propenyl-1,3-sulfonyl lactone.

3. The basalt fiber reinforced asphalt mixture according to claim 1, characterized in that, The amphiphilic epoxy resin is obtained by reacting dodecyl succinic anhydride, polyethylene glycol monomethyl ether 2000, and epoxy resin.

4. The basalt fiber reinforced asphalt mixture according to claim 1, characterized in that, The curing agent is obtained by combining m-phenylenediamine and 2-amino-4-cyanopyridine in a molar ratio of (2.5~3.5):(1.5~2.5).

5. The basalt fiber reinforced asphalt mixture according to claim 1, characterized in that, The accelerator is N-methylimidazole.

6. The method for preparing basalt fiber reinforced asphalt mixture according to any one of claims 1 to 5, characterized in that, The preparation steps include the following: (1) Weigh and prepare each raw material component; (2) Weigh the modified basalt fiber and mix it with acetone at a mass-to-volume ratio of 1g:15~25mL, then ultrasonically disperse for 10~20min to obtain an acetone dispersion of the modified basalt fiber; mix the weighed amphiphilic epoxy resin, curing agent and accelerator evenly, then heat to 90~110℃ for 55~65min, then heat to 110~130℃ for 110~130min, then cool to 50~80℃ and add The aforementioned modified basalt fiber acetone dispersion was mixed evenly and reacted for 1-3 days. After removing the acetone by vacuum drying, 0.03-0.08 parts by mass of concentrated sulfuric acid were added at room temperature. The temperature was raised to 40-80℃ and reacted for 1-3 days. Then, deionized water was added dropwise while stirring at 2000-3000 r / min. After the addition was complete, shearing was continued for 15-25 min to obtain an epoxy resin emulsion with a solid content of 48-52%. The emulsion was kept at 60-70℃ for later use. (3) Heat the waste rubber modified asphalt at 175~185℃ to a molten state to obtain molten waste rubber modified asphalt; pour boiling water into the colloid mill, circulate for 55~65s and then release the water to obtain a preheated colloid mill; pour epoxy resin emulsion into the preheated colloid mill and circulate for 25~35s, then pour in the molten waste rubber modified asphalt. After the waste rubber modified asphalt is completely added, shear it in the colloid mill for 2~7min, and then cool it in a room temperature water bath to obtain emulsified asphalt. (4) After mixing the aggregate in a mixer for 2-3 minutes, heat it to 150-180℃. Add emulsified asphalt under the mixing condition, keep it warm and mix for 45-60 minutes, and then store it in a heat preservation box at 150-180℃ to obtain basalt fiber reinforced asphalt mixture.

7. The method for preparing basalt fiber reinforced asphalt mixture according to claim 6, characterized in that, The preparation method of the amphiphilic epoxy resin is as follows: 17-18 parts by weight of polyethylene glycol monomethyl ether 2000 and 2-3 parts by weight of dodecyl succinic anhydride are heated at 95-105℃ for 30-60 min and stirred for 160-200 min. After cooling to room temperature, 80 parts by weight of epoxy resin E51 and 0.21-0.23 parts by weight of triphenylphosphine are added, and the mixture is heated to 115-125℃ and reacted for 160-200 min to obtain the amphiphilic epoxy resin.

8. The method for preparing basalt fiber reinforced asphalt mixture according to claim 6, characterized in that, The preparation steps of the modified basalt fiber are as follows: Basalt fiber is placed in acetone solution at a material-to-liquid ratio of 1g:15-25mL, ultrasonically washed and dispersed at 20-30℃ for 15-25min, then filtered. The obtained solid is repeatedly washed with deionized water and filtered 2-4 times. Then, it is added to 3M hydrochloric acid solution at 58-62℃ at a mass-to-volume ratio of 1g:15-25mL and ultrasonically washed for 50-70min. The solid is then filtered and repeatedly washed with deionized water and filtered 2-4 times before drying to obtain acidified basalt fiber. 11-12 parts by mass of triethoxysilylbutyraldehyde and 10-11 parts by mass of 3-mercaptopropyltrimethoxysilane are added to 400 parts by mass of anhydrous ethanol and stirred at 20-30℃ for 55-65min to obtain silane hydrolysate. The acidified basalt fiber is then... Basalt fibers were added to a silane hydrolysate at a mass-to-volume ratio of 1g:15-25mL and stirred for 55-65 minutes. The solid was then filtered and washed repeatedly with deionized water. After 2-4 filtrations, the solid was dried to obtain pre-modified basalt fibers. Under argon protection, the pre-modified basalt fibers were placed in an acetone solution at a material-to-liquid ratio of 1g:15-25mL and ultrasonically washed and dispersed at 20-30℃ for 15-25 minutes. Then, 1.9-2 parts by mass of propylene-1,3-sulfonyl lactone and 0.1-0.11 parts by mass of benzoin dimethyl ether were added and stirred for 20-40 minutes. The reaction was then continued under ultraviolet light for 15-25 minutes. After the reaction was completed, the mixture was filtered, washed 2-4 times with n-hexane, filtered again, and vacuum dried to constant weight to obtain modified basalt fibers.

9. The method for preparing basalt fiber reinforced asphalt mixture according to claim 6, characterized in that, The preparation steps of the waste rubber modified asphalt are as follows: 600-700 parts by weight of base asphalt are placed in an oven at 134-136℃ and melted completely. Then, 96-180 parts by weight of desulfurized waste tire rubber powder are added. The mixture is then sheared at 175-185℃ for 15-25 minutes at a shear rate of 2000-3000 r / min. Then, 0.6-0.7 parts by weight of stabilizer sulfur are added, and shearing is continued for another 15-25 minutes. Finally, the mixture is stirred and developed at 175-185℃ and 1000 r / min for 1.5-2.5 hours to obtain waste rubber modified asphalt.

10. The method for preparing basalt fiber reinforced asphalt mixture according to claim 6, characterized in that, The aggregate is composed of coarse aggregate, fine aggregate and mineral powder in a weight ratio of 4~5:1~2:

1. The particle size of the coarse aggregate is 10~20mm, and the particle size of the fine aggregate is 2~8mm. The mineral powder is limestone powder with a particle size of less than 2mm and steel slag combined in a mass ratio of 1:1.

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