Resin asphalt concrete for steel bridge deck ERS pavement and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and particularly relates to resin asphalt concrete for steel bridge deck ERS pavement and a preparation method of the resin asphalt concrete. The invention discloses resin asphalt concrete for steel bridge deck ERS pavement. The resin asphalt concrete comprises a component A, a component B and a component C, the component A comprises a component I and a component II; the component B comprises a component I, a component II and broken stone; the component I comprises the following raw materials: epoxy resin, SBS modified asphalt and benzyl alcohol; the component II comprises the following raw materials: SBS modified asphalt, a curing agent, a curing accelerator, benzyl alcohol and modified polyacrylonitrile fibers; the component C is prepared from the following raw materials: SBS modified asphalt, coarse aggregate, fine aggregate, mineral powder and a wear-resistant agent. The ERS steel bridge deck pavement system is used as a frame, the obtained concrete has good wear resistance and deformation resistance, and the service life of the concrete is prolonged. In addition, the obtained concrete has good anti-seepage performance, and the effect of protecting a steel bridge deck is achieved.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, specifically relating to a resin asphalt concrete for ERS pavement of steel bridge decks and its preparation method. Background Technology

[0002] Steel bridge deck paving is one of the key technologies and challenges in bridge engineering, with extremely complex operating environments and stress characteristics. Steel box girder bridge decks offer advantages such as light weight, large span, and good seismic performance, making them widely used in long-span bridges. However, steel bridge decks have relatively low stiffness, leading to significant local stress concentration under repeated vehicle loads, especially heavy and overloaded loads, making them prone to bending and torsional deformation. Furthermore, the physical and mechanical properties of steel and asphalt concrete pavement differ greatly, resulting in significant shear and peel stresses between the pavement layer and the steel plate under the combined effects of temperature changes and traffic loads. In addition, steel bridge decks are directly exposed to the external environment, facing corrosion from rainwater, de-icing salt, and other corrosive media, placing extremely stringent requirements on the waterproofing, corrosion resistance, and durability of the pavement system. Therefore, steel bridge deck pavement layers not only need excellent mechanical properties, good interlayer bonding, and the ability to adapt to the deformation of the steel plate, but also must possess high water tightness and durability.

[0003] Traditional steel bridge deck paving solutions, such as high-performance asphalt concrete, cast-in-place asphalt concrete, and epoxy asphalt concrete, each have their applications in practice, but they also have certain limitations. Ordinary modified asphalt concrete lacks sufficient high-temperature deformation resistance, making it prone to rutting and shoving under high temperatures and heavy loads in summer; at low temperatures, it is relatively brittle and prone to cracking. Its bond with the steel plate relies on a waterproof adhesive layer, which is susceptible to slippage or delamination under complex stress. Cast-in-place asphalt concrete has relatively poor high-temperature stability, and may experience flow deformation in hot regions. Furthermore, due to the need for high-temperature construction, it requires strict control of equipment and processes. Epoxy asphalt concrete is relatively brittle, making the control of construction temperature and time windows extremely demanding. Insufficient toughness may lead to brittle cracking under certain conditions, and repair is difficult.

[0004] To comprehensively address the aforementioned issues, the ERS pavement system, as a composite structure, has emerged and been successfully applied. Despite significant advancements in structural design, the performance of resin-modified asphalt concrete still has room for continuous optimization. Currently, the epoxy asphalt mixtures commonly used in ERS pavement systems may still face the risk of microcrack initiation and propagation under long-term fatigue loads. Furthermore, how to further improve the overall wear resistance, impermeability, and deformation resistance of the pavement layer to cope with increasing heavy traffic volume and extend road maintenance cycles is a crucial direction for current technological research and development.

[0005] Therefore, developing a composite material that can form a strong interfacial bond with epoxy resin asphalt matrix, is uniformly dispersed, and has excellent crack resistance and deformation resistance is of great significance for improving the long-term service performance of ERS pavement system. Summary of the Invention

[0006] The primary objective of this invention is to provide resin-modified asphalt concrete for ERS paving of steel bridge decks. The concrete obtained by this invention exhibits excellent wear resistance and deformation resistance, effectively resisting crack propagation and extending its service life. Furthermore, the concrete obtained by this invention possesses excellent impermeability, effectively reducing water penetration and minimizing water erosion of the steel bridge deck, thus protecting it.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A resin asphalt concrete for ERS pavement of steel bridge decks includes component A, component B, and component C; Component A includes component I and component II, and the mass ratio of component I to component II is 1:(1-1.1). Component B includes component I, component II and crushed stone, wherein the weight ratio of component I, component II and crushed stone is 1:1:(3-5). Component I comprises the following raw materials in parts by weight: 50-60 parts epoxy resin, 20-30 parts SBS modified bitumen, and 5-10 parts benzyl alcohol. Component II comprises the following raw materials in parts by weight: 10-20 parts of SBS modified bitumen, 20-30 parts of curing agent, 1-5 parts of curing accelerator, 5-10 parts of benzyl alcohol, and 8-15 parts of modified polyacrylonitrile fiber. Component C comprises the following raw materials in parts by weight: 10-20 parts of SBS modified bitumen, 15-20 parts of coarse aggregate, 20-30 parts of fine aggregate, 25-35 parts of mineral powder, and 5-8 parts of abrasion resistant agent. The preparation process of the modified polyacrylonitrile fiber is as follows: (1) Take polyacrylonitrile fiber and place it in an aqueous solution of sodium hydroxide. After heating and reacting, it is washed with water, acid washed and dried to obtain pretreated polyacrylonitrile fiber. (2) Add the pretreated polyacrylonitrile fiber from step (1) to the solvent, then add 1,2-dimethyl-4-aminopiperidine, and heat to react to obtain aminated polyacrylonitrile fiber; (3) The aminated polyacrylonitrile fiber from step (2) is immersed in a silane coupling agent solution to obtain modified polyacrylonitrile fiber.

[0008] Further, in step (1), the ratio of the amount of polyacrylonitrile fiber to the aqueous solution of sodium hydroxide is 1g:25-30mL, and the mass concentration of the aqueous solution of sodium hydroxide is 5-10%; the temperature of the heating reaction is 80-90℃, and the time is 70-80min.

[0009] Further, in step (2), the mass ratio of the pretreated polyacrylonitrile fiber, 1,2-dimethyl-4-aminopiperidine, and solvent is 1:(0.4-0.6):(100-120), and the solvent is DMF; the heating reaction temperature is 70-80℃, and the time is 1-2h.

[0010] Further, in step (3), the ratio of the amount of the aminated polyacrylonitrile fiber to the silane coupling agent solution is 1g:50-80mL, and the mass concentration of the silane coupling agent solution is 25-35%; the silane coupling agent in the silane coupling agent solution is KH550, and the solvent is anhydrous ethanol; the soaking time is 30-60min.

[0011] Further, the preparation process of the wear-resistant agent is as follows: nano-silica and silane coupling agent are added to mixed solution A, stirred at 40-50℃ for 40-60 min, the product is collected, and the product and mullite whiskers are added to mixed solution B, stirred at 40-50℃ for 30-40 min to obtain the wear-resistant agent.

[0012] Further, the ratio of the amount of nano-silica, silane coupling agent, and mixed solution A is 1g:0.3-0.5g:80-100mL; the ratio of the amount of the product, mullite whiskers, and mixed solution B is 1g:1-2g:80-100mL; the silane coupling agent is KH550; and both mixed solution A and mixed solution B are prepared from ethanol and water in a volume ratio of (3-4):1.

[0013] Further, the epoxy resin is 618 epoxy resin; the curing agent is a polyetheramine curing agent; the curing accelerator is 2-methylimidazole; the coarse aggregate is crushed stone with a particle size of 5-15 mm; the fine aggregate is river sand with a mud content of less than 0.5% and a particle size of 0.25-3 mm; the mineral powder is limestone mineral powder with a particle size of 0.15-0.6 mm; and the crushed stone in component B has a particle size of 5-15 mm.

[0014] The second objective of this invention is to provide a method for preparing resin-modified asphalt concrete for ERS pavement of steel bridge decks. This preparation method is efficient, stable, and easy to promote in engineering, and has significant theoretical and practical value for improving the service life and reliability of steel bridge deck pavement in my country, reducing costs, and supporting the high-quality development of transportation infrastructure.

[0015] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for preparing resin asphalt concrete for ERS pavement of steel bridge decks includes the following steps: S1. According to the formula, epoxy resin, SBS modified asphalt, and benzyl alcohol are mixed evenly to obtain component I; SBS modified asphalt, curing agent, curing accelerator, benzyl alcohol, and modified polyacrylonitrile fiber are mixed evenly to obtain component II; then components I and II are mixed and stirred according to the formula to obtain component A. S2. Mix component I, component II, and crushed stone evenly according to the ratio to obtain component B; S3. Mix the SBS modified asphalt, coarse aggregate, fine aggregate, mineral powder, and abrasion-resistant agent in component C according to the specified ratio. S4. During paving, apply component A evenly to the steel bridge surface, and then lay component B and component C in sequence.

[0016] This invention uses the existing ERS cold-mix epoxy steel bridge deck pavement system as a framework to comprehensively improve the mechanical properties and deformation resistance of concrete, extending its service life. Component A serves as the bonding layer, providing strong adhesion. The added modified polyacrylonitrile fibers, after surface treatment, exhibit good compatibility with epoxy resin, effectively transferring and dispersing stress, improving the material's toughness, crack resistance, and deformation resistance, reducing stress concentration, resisting crack propagation, and resulting in good durability and a long service life.

[0017] Component B is a high-strength, rigid structural layer. The rough crushed stone surface provides significant internal friction and interlocking force, preventing the asphalt layer from sliding on the steel bridge deck. This greatly improves the overall stiffness of the pavement system and effectively distributes wheel loads.

[0018] Component C is the topmost functional surface layer. This layer directly bears vehicle loads, wear, and environmental effects; the added abrasion-resistant agents improve the pavement's wear resistance and deformation resistance, enabling it to withstand repeated deformations of the steel bridge deck without easily cracking, extending the pavement maintenance cycle and reducing maintenance costs. Simultaneously, this layer has extremely low porosity, acting as a perfect waterproof and corrosion-resistant barrier, reducing water penetration and thus protecting the underlying structure.

[0019] The beneficial technical effects of this invention are as follows: 1. This invention relates to a resin asphalt concrete for ERS paving of steel bridge decks. Modified polyacrylonitrile fibers are added to component II. First, the polyacrylonitrile fibers are treated with an alkali solution to increase surface roughness and the presence of active groups such as carboxyl groups on the fiber surface. Next, 1,2-dimethyl-4-aminopiperidine is used for surface grafting, introducing stable amide bonds. The heterocyclic structure has a certain degree of elasticity, effectively transferring and dispersing stress, and improving the mechanical properties of the material. Finally, a silane coupling agent is used for modification to improve compatibility with epoxy resin and prevent fiber agglomeration. The modified polyacrylonitrile fibers form a network structure in the epoxy resin asphalt mixture, improving the stability of the mixture, significantly enhancing the material's resistance to deformation, resisting crack propagation, and extending its service life.

[0020] 2. The wear-resistant agent added in this invention can improve the wear resistance and deformation resistance of the road surface, extend the road maintenance cycle, and reduce maintenance costs. It can also fully fill the microscopic voids and cracks in the asphalt mixture, improve the structural density, reduce water penetration, and protect the steel bridge deck.

[0021] 3. This invention provides an efficient, stable, and easily engineering-promoted preparation method, which has significant theoretical and practical value for improving the lifespan and reliability of steel bridge deck paving in my country, reducing the total life-cycle cost, and supporting the high-quality development of transportation infrastructure. Attached Figure Description

[0022] Figure 1 This is a scanning electron microscope image of the modified polyacrylonitrile fiber obtained in Example 1 of the present invention; Figure 2 This is a scanning electron microscope image of the wear-resistant agent obtained in Example 1 of the present invention. Detailed Implementation

[0023] The following is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention. Specific conditions not specified in the embodiments are performed according to conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, all reagents or instruments used are conventional products obtained through commercial channels.

[0024] The epoxy resin used in this invention is 618 epoxy resin; The curing agent of this invention is a polyetheramine curing agent with an amine value of 400-440 mgKOH / g and a viscosity (40℃) of 1500-3000 mPa·s. The curing accelerator of this invention is 2-methylimidazole; The coarse aggregate of this invention is crushed stone with a particle size of 5-15mm; The fine aggregate of this invention is river sand with a mud content of less than 0.5% and a particle size of 0.25-3mm; The mineral powder of this invention is limestone mineral powder with a particle size of 0.15-0.6 mm; The crushed stone particle size in component B of this invention is 5-15 mm; The polyacrylonitrile fibers of this invention have a diameter of 15-18 μm; The mullite whiskers of this invention have a length of 5-10 μm and a diameter of 100-300 nm.

[0025] Example 1 A resin asphalt concrete for steel bridge deck ERS (resin asphalt composite system) paving, comprising component A, component B, and component C; Component A includes component I and component II, wherein the mass ratio of component I to component II is 1:1.05; Component B includes component I, component II and crushed stone, wherein the weight ratio of component I, component II and crushed stone is 1:1:4; Component I comprises the following raw materials in parts by weight: 55 parts epoxy resin, 25 parts SBS modified bitumen, and 8 parts benzyl alcohol. Component II comprises the following raw materials in parts by weight: 15 parts SBS modified bitumen, 25 parts curing agent, 3 parts curing accelerator, 8 parts benzyl alcohol, and 12 parts modified polyacrylonitrile fiber. Component C comprises the following raw materials in parts by weight: 15 parts SBS modified bitumen, 18 parts coarse aggregate, 25 parts fine aggregate, 30 parts mineral powder, and 7 parts abrasion resistant agent.

[0026] The preparation process of the modified polyacrylonitrile fiber in this embodiment is as follows: (1) Take polyacrylonitrile fiber and place it in an aqueous solution of sodium hydroxide (8wt%). The ratio of the amount of polyacrylonitrile fiber to the aqueous solution of sodium hydroxide is 1g:25mL. Heat the solution at 85℃ for 75min. After washing with water, acid washing and drying, pretreated polyacrylonitrile fiber is obtained. (2) The pretreated polyacrylonitrile fibers from step (1) were added to N,N-dimethylformamide (DMF), and then 1,2-dimethyl-4-aminopiperidine was added. The mass ratio of the pretreated polyacrylonitrile fibers, 1,2-dimethyl-4-aminopiperidine, and DMF was 1:0.5:110. The mixture was then heated at 75°C for 1.5 h. After filtration, washing, and drying, aminated polyacrylonitrile fibers were obtained. (3) Take KH550 (γ-aminopropyltriethoxysilane) and add it to anhydrous ethanol to obtain a KH550 solution with a concentration of 30wt%. Add the aminated polyacrylonitrile fiber from step (2) to the KH550 solution, wherein the ratio of the aminated polyacrylonitrile fiber to the KH550 solution is 1g:70mL. Soak for 45min. After filtration, washing and drying, the modified polyacrylonitrile fiber is obtained. Figure 1 This is an electron microscope image of modified polyacrylonitrile fibers.

[0027] The preparation process of the wear-resistant agent in this embodiment is as follows: A mixed solution of ethanol and water is prepared in advance at a volume ratio of 3.5:1. Nano-silica and KH550 are added to the mixed solution of ethanol and water, wherein the volume ratio of nano-silica, KH550, and the mixed solution is 1g:0.4g:90mL. The mixture is then stirred at 45°C for 50 minutes, and the product is collected. The product and mullite whiskers are added to the mixed solution of ethanol and water, wherein the volume ratio of the product, mullite whiskers, and the mixed solution is 1g:1.5g:90mL. The mixture is then stirred at 45°C for 35 minutes, washed with deionized water, and vacuum dried to obtain the wear-resistant agent. Figure 2 This is an electron microscope image of the wear-resistant agent.

[0028] A method for preparing resin asphalt concrete for ERS pavement of steel bridge decks includes the following steps: S1. According to the formula, epoxy resin, SBS modified asphalt, and benzyl alcohol are mixed evenly to obtain component I; SBS modified asphalt, curing agent, curing accelerator, benzyl alcohol, and modified polyacrylonitrile fiber are mixed evenly to obtain component II; then components I and II are mixed and stirred according to the formula to obtain component A. S2. Mix component I, component II, and crushed stone evenly according to the proportion to obtain component B; S3. Mix the SBS modified asphalt, coarse aggregate, fine aggregate, mineral powder, and abrasion-resistant agent in component C according to the specified ratio. S4. During paving, component A is evenly coated on the steel bridge surface to form an adhesive layer; then component B is laid; finally, component C is laid.

[0029] Example 2 A resin asphalt concrete for ERS pavement of steel bridge decks includes component A, component B, and component C; Component A includes component I and component II, wherein the mass ratio of component I to component II is 1:1; Component B includes component I, component II and crushed stone, wherein the weight ratio of component I, component II and crushed stone is 1:1:3; Component I comprises the following raw materials in parts by weight: 50 parts epoxy resin, 20 parts SBS modified bitumen, and 5 parts benzyl alcohol. Component II comprises the following raw materials in parts by weight: 10 parts SBS modified bitumen, 20 parts curing agent, 1 part curing accelerator, 5 parts benzyl alcohol, and 8 parts modified polyacrylonitrile fiber. Component C comprises the following raw materials in parts by weight: 10 parts SBS modified bitumen, 15 parts coarse aggregate, 20 parts fine aggregate, 25 parts mineral powder, and 5 parts abrasion resistant agent.

[0030] The preparation process of the modified polyacrylonitrile fiber in this embodiment is as follows: (1) Take polyacrylonitrile fiber and place it in an aqueous solution of sodium hydroxide (5wt%). The ratio of the amount of polyacrylonitrile fiber to the aqueous solution of sodium hydroxide is 1g:25mL. Heat the solution at 80℃ for 80min. After washing with water, acid washing and drying, pretreated polyacrylonitrile fiber is obtained. (2) The pretreated polyacrylonitrile fiber from step (1) was added to DMF, and then 1,2-dimethyl-4-aminopiperidine was added. The mass ratio of the pretreated polyacrylonitrile fiber, 1,2-dimethyl-4-aminopiperidine, and DMF was 1:0.4:100. The mixture was then heated at 70°C for 2 hours. After filtration, washing, and drying, aminated polyacrylonitrile fiber was obtained. (3) Add KH550 to anhydrous ethanol to obtain a KH550 solution with a concentration of 25wt%. Add the aminated polyacrylonitrile fiber from step (2) to the KH550 solution, wherein the ratio of the aminated polyacrylonitrile fiber to the KH550 solution is 1g:50mL. Soak for 30min. After filtration, washing and drying, the modified polyacrylonitrile fiber is obtained.

[0031] The preparation process of the wear-resistant agent in this embodiment is as follows: A mixed solution of ethanol and water at a volume ratio of 3:1 is prepared beforehand. Nano-silica and KH550 are added to the mixed solution of ethanol and water, wherein the ratio of nano-silica, KH550, and the mixed solution is 1g:0.3g:80mL. The mixture is then stirred at 40℃ for 40min, and the product is collected. The product and mullite whiskers are added to the mixed solution of ethanol and water, wherein the ratio of the product, mullite whiskers, and the mixed solution is 1g:1g:80mL. The mixture is then stirred at 40℃ for 40min, washed with deionized water, and vacuum dried to obtain the wear-resistant agent.

[0032] A method for preparing resin asphalt concrete for ERS pavement of steel bridge decks, the specific steps of which are the same as in Example 1.

[0033] Example 3 A resin asphalt concrete for ERS pavement of steel bridge decks includes component A, component B, and component C; Component A comprises component I and component II, wherein the mass ratio of component I to component II is 1:1.1; Component B includes component I, component II and crushed stone, wherein the weight ratio of component I, component II and crushed stone is 1:1:5; Component I comprises the following raw materials in parts by weight: 60 parts epoxy resin, 30 parts SBS modified bitumen, and 10 parts benzyl alcohol. Component II comprises the following raw materials in parts by weight: 20 parts SBS modified bitumen, 30 parts curing agent, 5 parts curing accelerator, 10 parts benzyl alcohol, and 15 parts modified polyacrylonitrile fiber. Component C comprises the following raw materials in parts by weight: 20 parts SBS modified bitumen, 20 parts coarse aggregate, 30 parts fine aggregate, 35 parts mineral powder, and 8 parts abrasion resistant agent.

[0034] The preparation process of the modified polyacrylonitrile fiber in this embodiment is as follows: (1) Take polyacrylonitrile fiber and place it in an aqueous solution of sodium hydroxide (10wt%). The ratio of the amount of polyacrylonitrile fiber to the aqueous solution of sodium hydroxide is 1g:30mL. Heat the solution at 90℃ for 70min. After washing with water, acid washing and drying, pretreated polyacrylonitrile fiber is obtained. (2) The pretreated polyacrylonitrile fiber from step (1) was added to DMF, and then 1,2-dimethyl-4-aminopiperidine was added. The mass ratio of the pretreated polyacrylonitrile fiber, 1,2-dimethyl-4-aminopiperidine, and DMF was 1:0.6:120. The mixture was then heated at 80°C for 1 hour. After filtration, washing, and drying, aminated polyacrylonitrile fiber was obtained. (3) Add KH550 to anhydrous ethanol to obtain a KH550-containing solution with a concentration of 35wt%. Add the aminated polyacrylonitrile fiber from step (2) to the KH550-containing solution, wherein the ratio of the aminated polyacrylonitrile fiber to the KH550-containing solution is 1g:80mL. Soak for 60min. After filtration, washing, and drying, the modified polyacrylonitrile fiber is obtained.

[0035] The preparation process of the wear-resistant agent in this embodiment is as follows: A mixed solution of ethanol and water at a volume ratio of 4:1 is prepared beforehand. Nano-silica and KH550 are added to the mixed solution of ethanol and water, wherein the ratio of nano-silica, KH550, and the mixed solution is 1g:0.5g:100mL. The mixture is then stirred at 50℃ for 30min, and the product is collected. The product and mullite whiskers are added to the mixed solution of ethanol and water, wherein the ratio of the product, mullite whiskers, and the mixed solution is 1g:2g:100mL. The mixture is then stirred at 50℃ for 40min, washed with deionized water, and vacuum dried to obtain the wear-resistant agent.

[0036] A method for preparing resin asphalt concrete for ERS pavement of steel bridge decks, the specific steps of which are the same as in Example 1.

[0037] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the modified polyacrylonitrile fiber is replaced with polyacrylonitrile fiber, while the rest is the same as Example 1.

[0038] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that step (2) of the modified polyacrylonitrile fiber preparation process is omitted, and the aminated polyacrylonitrile fiber in step (3) is replaced with the polyacrylonitrile fiber pretreated in step (1); otherwise, it is consistent with Example 1.

[0039] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the wear-resistant agent is replaced with mullite whiskers; otherwise, they are the same as Example 1.

[0040] Test case To investigate the performance of the resin-modified asphalt concrete for steel bridge deck ERS pavement obtained in Examples 1-3 and Comparative Examples 1-3 of this invention, the following tests were conducted: (1) The fracture strength, elongation at break, and pull-out strength of the adhesive layers formed by component A in Examples 1-3 and Comparative Examples 1-2 were tested in accordance with the standard JT / T1131-2017 at a test temperature of 25℃. The test results are shown in Table 1.

[0041] (2) The permeability coefficient (T0730-2025 asphalt mixture permeability test), rutting dynamic stability at 60℃, and Marshall stability at 60℃ of component C in Examples 1-3 and Comparative Example 3 were tested according to the test methods in JTG 3410-2025 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The test results are shown in Table 2.

[0042] (3) The wear amount of component C in Examples 1-3 and Comparative Example 3 was tested using a universal friction and wear tester. The load was controlled at 50 N, the rotation speed at 180 r / min, and the test time at 2 h. The test results are shown in Table 2.

[0043] As shown in Table 1, the adhesive layer formed by component A of this invention has good mechanical properties and toughness, which helps to extend the service life of the material. The adhesive layers of Examples 1-3 have higher breaking strength, elongation at break, and pull-out strength compared to Comparative Examples 1-2. In Comparative Example 1, the modified polyacrylonitrile fiber was replaced with polyacrylonitrile fiber without modification, resulting in a significant decrease in the mechanical properties of the material. Comparative Example 2 omitted step (2) of the modified polyacrylonitrile fiber preparation process, i.e., omitted the grafting of 1,2-dimethyl-4-aminopiperidine, and its mechanical properties were inferior to the adhesive layer obtained in Example 1. This demonstrates that the modified polyacrylonitrile fiber added in this invention plays an important role in improving the mechanical properties, elasticity, and resistance to deformation of the material.

[0044] Table 2 shows that the dynamic stability and Marshall stability of the concrete obtained in Examples 1-3 of this invention are higher than those in Comparative Example 3 (where the abrasion-resistant agent was replaced with mullite whiskers). This indicates that the asphalt mixture has strong stability, is not easily rutted, effectively resists deformation, and ensures the structural stability of the pavement under load. The wear amount and permeability coefficient of Examples 1-3 are lower than those of Comparative Example 3, indicating that the compactness and water damage resistance of the pavement structure are superior to those of the comparative example. Their abrasion resistance, Marshall stability, rutting dynamic stability, and permeability coefficient are all significantly reduced. In summary, the abrasion-resistant agent added in this invention improves the abrasion resistance, deformation resistance, and water permeability resistance of concrete.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. The basic principles and main features of the present invention have been described above with specific implementation schemes. Based on the present invention, some modifications or substitutions can be made, but these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of protection claimed by the present invention.

Claims

1. A resin asphalt concrete for steel bridge deck ERS pavement, characterized by, Includes component A, component B, and component C; Component A includes component I and component II, and the mass ratio of component I to component II is 1:(1-1.1). Component B includes component I, component II and crushed stone, wherein the weight ratio of component I, component II and crushed stone is 1:1:(3-5). Component I comprises the following raw materials in parts by weight: 50-60 parts epoxy resin, 20-30 parts SBS modified bitumen, and 5-10 parts benzyl alcohol. Component II comprises the following raw materials in parts by weight: 10-20 parts of SBS modified bitumen, 20-30 parts of curing agent, 1-5 parts of curing accelerator, 5-10 parts of benzyl alcohol, and 8-15 parts of modified polyacrylonitrile fiber. Component C comprises the following raw materials in parts by weight: 10-20 parts of SBS modified bitumen, 15-20 parts of coarse aggregate, 20-30 parts of fine aggregate, 25-35 parts of mineral powder, and 5-8 parts of abrasion resistant agent. The preparation process of the modified polyacrylonitrile fiber is as follows: (1) Take polyacrylonitrile fiber and place it in an aqueous solution of sodium hydroxide. After heating and reacting, it is washed with water, acid washed and dried to obtain pretreated polyacrylonitrile fiber. (2) Add the pretreated polyacrylonitrile fiber from step (1) to the solvent, then add 1,2-dimethyl-4-aminopiperidine, and heat to react to obtain aminated polyacrylonitrile fiber; (3) The aminated polyacrylonitrile fiber from step (2) is immersed in a silane coupling agent solution to obtain modified polyacrylonitrile fiber.

2. The resin asphalt concrete for steel bridge deck ERS pavement according to claim 1, characterized by, In step (1), the ratio of the amount of polyacrylonitrile fiber to the aqueous solution of sodium hydroxide is 1g:25-30mL, and the mass concentration of the aqueous solution of sodium hydroxide is 5-10%; the heating reaction temperature is 80-90℃ and the time is 70-80min.

3. The resin asphalt concrete for steel bridge deck ERS pavement according to claim 1, characterized by, In step (2), the mass ratio of the pretreated polyacrylonitrile fiber, 1,2-dimethyl-4-aminopiperidine, and solvent is 1:(0.4-0.6):(100-120), and the solvent is DMF; the heating reaction temperature is 70-80℃, and the time is 1-2h.

4. The resin asphalt concrete for steel bridge deck ERS pavement according to claim 1, characterized by, In step (3), the ratio of the amount of aminated polyacrylonitrile fiber to the silane coupling agent solution is 1g:50-80mL; the mass concentration of the silane coupling agent solution is 25-35%; the silane coupling agent in the silane coupling agent solution is KH550, and the solvent is anhydrous ethanol; the soaking time is 30-60min.

5. The resin asphalt concrete for steel bridge deck ERS pavement according to claim 1, wherein The preparation process of the wear-resistant agent is as follows: nano-silica and silane coupling agent are added to mixed solution A, stirred at 40-50℃ for 40-60 min, the product is collected, and the product and mullite whiskers are added to mixed solution B, stirred at 40-50℃ for 30-40 min to obtain the wear-resistant agent.

6. The resin asphalt concrete for steel bridge deck ERS pavement according to claim 1, wherein The ratio of the amount of nano-silica, silane coupling agent, and mixed solution A is 1g:0.3-0.5g:80-100mL; the ratio of the amount of the product, mullite whiskers, and mixed solution B is 1g:1-2g:80-100mL; the silane coupling agent is KH550; both mixed solution A and mixed solution B are prepared from ethanol and water in a volume ratio of (3-4):

1.

7. The resin asphalt concrete for steel bridge deck ERS pavement according to claim 6, characterized in that, The epoxy resin is 618 epoxy resin; the curing agent is polyetheramine curing agent; the curing accelerator is 2-methylimidazole; the coarse aggregate is crushed stone with a particle size of 5-15 mm; the fine aggregate is river sand with a mud content of less than 0.5% and a particle size of 0.25-3 mm; the mineral powder is limestone mineral powder with a particle size of 0.15-0.6 mm; the crushed stone in component B has a particle size of 5-15 mm.

8. A method of preparing a resinous bituminous concrete for ERS deck pavement of a steel bridge according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. According to the formula, epoxy resin, SBS modified asphalt, and benzyl alcohol are mixed evenly to obtain component I; SBS modified asphalt, curing agent, curing accelerator, benzyl alcohol, and modified polyacrylonitrile fiber are mixed evenly to obtain component II. Then, components I and II are mixed and stirred according to the formula to obtain component A; S2. Mix component I, component II, and crushed stone evenly according to the proportion to obtain component B; S3. Mix the SBS modified asphalt, coarse aggregate, fine aggregate, mineral powder, and abrasion-resistant agent in component C according to the specified ratio. S4. During paving, apply component A evenly to the steel bridge surface, and then lay component B and component C in sequence.

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