Highly viscous ultra-thin overlay asphalt for pavement maintenance and method of construction

Abstract

The present application relates to the technical field of asphalt, in particular to a high-viscosity ultra-thin overlay asphalt for road maintenance and a construction method thereof, the asphalt comprises the following raw materials in parts by weight: 55-60 parts of base asphalt, 8-11 parts of terpene resin, 7-10 parts of SBS elastomer, 4-7 parts of silicate cement, 5-8 parts of modified fiber agent, 4-7 parts of functional agent, 2-4 parts of silane agent, and 2-4 parts of aggregate; the ultra-thin overlay asphalt of the present application adopts base asphalt, terpene resin, SBS elastomer, silicate cement and aggregate, and is mixed with modified fiber agent and functional agent; through the coordination and mutual assistance of the raw materials, the crack resistance, bonding strength and compressive strength of the obtained ultra-thin overlay asphalt are improved in coordination, and the weather resistance and stability of the product are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of asphalt technology, specifically to a high-viscosity ultra-thin overlay asphalt for road maintenance and its construction method. Background Technology

[0002] With increasing traffic loads and extended service life, municipal roads and highways often suffer from defects such as cracks, ruts, and surface loosening, requiring overlay maintenance to restore their road performance. Ultra-thin overlays (thickness ≤ 5cm) have become one of the mainstream maintenance solutions due to their small workload, low cost, and minimal impact on traffic. However, existing high-viscosity ultra-thin overlay asphalt exhibits poor crack resistance. Furthermore, improving crack resistance can easily compromise bond strength and compressive strength. Additionally, the product suffers from poor weather resistance, limiting its usability. Therefore, this invention provides further improvements. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the purpose of this invention is to provide a high-viscosity ultra-thin overlay asphalt for road maintenance and a construction method thereof, so as to solve the problems mentioned in the background art.

[0004] The present invention solves the technical problem by adopting the following technical solution: This invention provides a high-viscosity, ultra-thin overlay asphalt for road maintenance, wherein the asphalt comprises the following raw materials in parts by weight: 55-60 parts base asphalt, 8-11 parts terpene resin, 7-10 parts SBS elastomer, 4-7 parts silicate cement, 5-8 parts modified fiber agent, 4-7 parts functional agent, 2-4 parts silane agent, and 2-4 parts aggregate.

[0005] Preferably, the SBS elastomer is SBS-g-MAH; the base asphalt is 70# asphalt; the aggregate is crushed stone and sand with a mass ratio of 1:(2-3), the crushed stone is crushed stone with a particle size of 10-15mm; the sand has a particle size of 0.2-0.5mm; and the silane agent is silane coupling agent KH560.

[0006] Preferably, the modification method of the modified fiber agent is as follows: S01: Stir graphene thoroughly in a sufficient amount of potassium permanganate solution with a mass fraction of 10-15%, then wash with water, filter and dry. Sonicate the dried graphene and ultrasonic liquid at a weight ratio of 5:(7-9). After ultrasonication, obtain an ultrasonic liquid containing graphene. S02: Silicon carbide fiber and basalt fiber are compounded in a weight ratio of 3:2, and then added to an ultrasonic liquid containing graphene in a volume of 5-8 times the total weight of silicon carbide fiber for impregnation treatment. After impregnation, the mixture is filtered and dried to obtain a fiber-graphene hybrid agent. S03: Fiber-graphene hybrid agent and modified material are ball-milled at a weight ratio of (11-15):7, with a ball milling speed of 1200-1500 r / min for 2 hours. After ball milling, the mixture is filtered and dried to obtain the modified fiber agent.

[0007] Preferably, the ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment lasts for 1 hour; the impregnation pressure of the impregnation treatment is 10-15MPa, and the impregnation lasts for 1 hour.

[0008] Preferably, the ultrasonic fluid comprises the following raw materials in parts by weight: 2-5 parts β-cyclodextrin, 1-2 parts silane coupling agent KH550, 4-7 parts carbon nanotubes, 2-3 parts mullite powder, and 5-8 parts 85% ethanol aqueous solution.

[0009] Preferably, the modified material is prepared by mixing 5-8 parts of kaolin, 2-5 parts of lanthanum oxide and 4-7 parts of nanocellulose liquid evenly to obtain the modified material; the nanocellulose liquid is prepared by mixing nanocellulose and sodium lignosulfonate solution at a weight ratio of 2:(5-8).

[0010] Preferably, the sodium lignosulfonate solution has a mass fraction of 5-8%.

[0011] Preferably, the preparation method of the functional agent is as follows: S11: Add 2-5 parts of titanium dioxide, 5-8 parts of dolomite, and 1-2 parts of potassium feldspar to 7-10 parts of sodium alginate solution and stir until homogeneous to obtain the first functional liquid; S12: Mix 5-8 parts of calcium sulfate whiskers, 2-4 parts of calcined talc powder and 2-3 parts of yttrium nitrate solution evenly to obtain the second functional liquid; S13: Stir silica in a sufficient amount of 5% hydrochloric acid solution until uniform, then wash with water, filter and dry. The dried silica and the first functional liquid are subjected to primary ball milling at a weight ratio of 11:(5-7). After ball milling, the first grinding liquid is obtained. S14: The primary grinding fluid and the secondary functional fluid are subjected to secondary ball milling at a weight ratio of 7:(3-5). After ball milling, the mixture is filtered and dried to obtain the functional agent.

[0012] Preferably, the sodium alginate solution has a mass fraction of 5-8%; and the yttrium nitrate solution has a mass fraction of 2-5%.

[0013] Preferably, the ball milling speed for the first-stage ball milling process is 1050-1150 r / min, and the milling time is 2 h; the ball milling speed for the second-stage ball milling process is 750-850 r / min, and the milling time is 5 h.

[0014] This invention also provides a construction method for high-viscosity ultra-thin overlay asphalt for road maintenance, comprising the following steps: First, weigh the raw materials according to the weight proportions, mix the raw materials evenly to obtain high-viscosity ultra-thin overlay asphalt, spread the high-viscosity ultra-thin overlay asphalt to the road base, the paving thickness is 2-4cm, preheat the paver screed to 170-180℃, the paving speed is 2-3m / min, then use an 8-10t steel wheel roller to compact it 2-4 times, and finally cure it naturally for 12 hours.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The ultra-thin overlay asphalt of this invention uses base asphalt, terpene resin and SBS elastomer, along with silicate cement, aggregate raw materials, and blending modifiers and functional agents. Through the coordination and synergistic effect of the raw materials, the crack resistance, bonding strength and compressive strength of the ultra-thin overlay asphalt are improved in a coordinated manner, and the weather resistance and stability of the product are significantly improved. In the SO1 step of the modified fiber agent, the active performance of graphene is optimized through oxidation treatment and ultrasonic dispersion. Potassium permanganate oxidizes graphene, which can introduce oxygen-containing active groups on the graphene surface, making it change from "inert" to "active", making it easier to combine with the components in the ultrasonic fluid (such as silane coupling agent KH550), laying the foundation for subsequent fiber attachment. Step S02 involves fiber blending and high-pressure impregnation to create a "performance complement" between silicon carbide fiber and basalt fiber, while simultaneously loading functional components such as graphene. Silicon carbide fiber is heat-resistant and rigid, which can enhance the fiber agent's resistance to deformation; basalt fiber has good toughness and impact resistance, which can enhance crack resistance. The blending of the two avoids the defects of single fibers being "rigid enough but brittle" or "tough enough but soft". The silane coupling agent KH550 in the ultrasonic fluid acts as a "bridge," connecting the active groups of fibers / graphene at one end and the organic components of asphalt at the other, significantly improving the interfacial bonding force between the fiber agent and asphalt. At the same time, the carbon nanotubes and mullite powder in the ultrasonic fluid complement each other, enhancing the product's performance. The components of the modified material and ultrasonic fluid also add anti-aging and structural stabilizing functions to the fiber agent, improving the overall durability of the asphalt. The kaolin in the modified material can enhance the structural stability of the fiber agent and prevent softening and deformation at high temperatures. Lanthanum oxide can inhibit the aging reaction of asphalt and extend its service life. The combination of nanocellulose and sodium lignosulfonate dispersion can further improve the toughness of the fiber agent and strengthen its crack resistance. The silica in the functional agent is activated and dispersed by hydrochloric acid solution, and then improved by ball milling with the first and second functional liquids. The titanium dioxide, dolomite, potassium feldspar and other raw materials in the first functional liquid are blended and formulated to enhance the performance of the system. At the same time, calcium sulfate whiskers and calcined talc are added to the raw material system for further blending. As a result, the reinforcing effect of the functional agent and the modified fiber agent is enhanced, and the performance of the product is further improved. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] This embodiment describes a high-viscosity, ultra-thin overlay asphalt for road maintenance, comprising the following raw materials by weight: 55-60 parts base asphalt, 8-11 parts terpene resin, 7-10 parts SBS elastomer, 4-7 parts silicate cement, 5-8 parts modified fiber agent, 4-7 parts functional agent, 2-4 parts silane agent, and 2-4 parts aggregate.

[0018] In this embodiment, the SBS elastomer is SBS-g-MAH; the base asphalt is 70# asphalt; the aggregate is crushed stone and sand with a mass ratio of 1:(2-3), the crushed stone is crushed stone with a particle size of 10-15mm; the sand has a particle size of 0.2-0.5mm; and the silane agent is silane coupling agent KH560.

[0019] The modification method of the modified fiber agent in this embodiment is as follows: S01: Stir graphene thoroughly in a sufficient amount of potassium permanganate solution with a mass fraction of 10-15%, then wash with water, filter and dry. Sonicate the dried graphene and ultrasonic liquid at a weight ratio of 5:(7-9). After ultrasonication, obtain an ultrasonic liquid containing graphene. S02: Silicon carbide fiber and basalt fiber are compounded in a weight ratio of 3:2, and then added to an ultrasonic liquid containing graphene in a volume of 5-8 times the total weight of silicon carbide fiber for impregnation treatment. After impregnation, the mixture is filtered and dried to obtain a fiber-graphene hybrid agent. S03: Fiber-graphene hybrid agent and modified material are ball-milled at a weight ratio of (11-15):7, with a ball milling speed of 1200-1500 r / min for 2 hours. After ball milling, the mixture is filtered and dried to obtain the modified fiber agent.

[0020] In this embodiment, the ultrasonic power for ultrasonic treatment is 350-400W, and the ultrasonic treatment lasts for 1 hour; the impregnation pressure for impregnation treatment is 10-15MPa, and the impregnation lasts for 1 hour.

[0021] The ultrasonic fluid in this embodiment comprises the following raw materials in parts by weight: 2-5 parts β-cyclodextrin, 1-2 parts silane coupling agent KH550, 4-7 parts carbon nanotubes, 2-3 parts mullite powder, and 5-8 parts 85% ethanol aqueous solution.

[0022] The modified material in this embodiment is prepared by mixing 5-8 parts of kaolin, 2-5 parts of lanthanum oxide and 4-7 parts of nanocellulose liquid evenly to obtain the modified material; the nanocellulose liquid is prepared by mixing nanocellulose and sodium lignosulfonate solution at a weight ratio of 2:(5-8).

[0023] The sodium lignosulfonate solution in this embodiment has a mass fraction of 5-8%.

[0024] The preparation method of the functional agent in this embodiment is as follows: S11: Add 2-5 parts of titanium dioxide, 5-8 parts of dolomite, and 1-2 parts of potassium feldspar to 7-10 parts of sodium alginate solution and stir until homogeneous to obtain the first functional liquid; S12: Mix 5-8 parts of calcium sulfate whiskers, 2-4 parts of calcined talc powder and 2-3 parts of yttrium nitrate solution evenly to obtain the second functional liquid; S13: Stir silica in a sufficient amount of 5% hydrochloric acid solution until uniform, then wash with water, filter and dry. The dried silica and the first functional liquid are subjected to primary ball milling at a weight ratio of 11:(5-7). After ball milling, the first grinding liquid is obtained. S14: The primary grinding fluid and the secondary functional fluid are subjected to secondary ball milling at a weight ratio of 7:(3-5). After ball milling, the mixture is filtered and dried to obtain the functional agent.

[0025] In this embodiment, the sodium alginate solution has a mass fraction of 5-8%; the yttrium nitrate solution has a mass fraction of 2-5%.

[0026] In this embodiment, the ball milling speed for the first-stage ball milling process is 1050-1150 r / min, and the ball milling time is 2 hours; the ball milling speed for the second-stage ball milling process is 750-850 r / min, and the ball milling time is 5 hours.

[0027] This embodiment describes a construction method for high-viscosity ultra-thin overlay asphalt used for road maintenance, comprising the following steps: First, weigh the raw materials according to the weight proportions, mix the raw materials evenly to obtain high-viscosity ultra-thin overlay asphalt, spread the high-viscosity ultra-thin overlay asphalt to the road base, the paving thickness is 2-4cm, preheat the paver screed to 170-180℃, the paving speed is 2-3m / min, then use an 8-10t steel wheel roller to compact it 2-4 times, and finally cure it naturally for 12 hours.

[0028] Example 1. This embodiment describes a high-viscosity, ultra-thin overlay asphalt for road maintenance, comprising the following raw materials by weight: 55 parts base asphalt, 8 parts terpene resin, 7 parts SBS elastomer, 4 parts silicate cement, 5 parts modified fiber agent, 4 parts functional agent, 2 parts silane agent, and 2 parts aggregate.

[0029] In this embodiment, the SBS elastomer is SBS-g-MAH; the base asphalt is 70# asphalt; the aggregate is crushed stone and sand with a mass ratio of 1:2, the crushed stone is 10mm in diameter, the sand has a particle size of 0.2mm, and the silane agent is silane coupling agent KH560.

[0030] The modification method of the modified fiber agent in this embodiment is as follows: S01: Stir graphene thoroughly in a sufficient amount of 10% potassium permanganate solution, then wash with water, filter, and dry. Sonicate the dried graphene and ultrasonic fluid at a weight ratio of 5:7. After sonication, obtain an ultrasonic fluid containing graphene. S02: Silicon carbide fiber and basalt fiber are compounded in a weight ratio of 3:2, and then added to an ultrasonic liquid containing graphene in a volume of 5 times the total amount of silicon carbide fiber for impregnation treatment. After impregnation, the mixture is filtered and dried to obtain a fiber-graphene hybrid agent. S03: The fiber-graphene hybrid agent and the modified material were ball-milled at a weight ratio of 11:7 at a speed of 1200 r / min for 2 hours. After the ball milling was completed, the mixture was filtered and dried to obtain the modified fiber agent.

[0031] In this embodiment, the ultrasonic power for ultrasonic treatment is 350W, and the ultrasonic treatment lasts for 1 hour; the impregnation pressure for impregnation treatment is 10MPa, and the impregnation lasts for 1 hour.

[0032] The ultrasonic fluid in this embodiment comprises the following raw materials in parts by weight: Two parts of β-cyclodextrin, one part of silane coupling agent KH550, four parts of carbon nanotubes, two parts of mullite powder, and five parts of 85% ethanol aqueous solution.

[0033] The modified material in this embodiment is prepared by mixing 5 parts of kaolin, 2 parts of lanthanum oxide and 4 parts of nanocellulose liquid evenly to obtain the modified material; the nanocellulose liquid is prepared by mixing nanocellulose and sodium lignosulfonate solution at a weight ratio of 2:5.

[0034] The sodium lignosulfonate solution in this embodiment has a mass fraction of 5%.

[0035] The preparation method of the functional agent in this embodiment is as follows: S11: Add 2 parts titanium dioxide, 5 parts dolomite, and 1 part potassium feldspar to 7 parts sodium alginate solution and stir until homogeneous to obtain the first functional liquid; S12: Mix 5 parts calcium sulfate whiskers, 2 parts calcined talc powder and 2 parts yttrium nitrate solution evenly to obtain the second functional liquid; S13: Stir silica in a sufficient amount of 5% hydrochloric acid solution until homogeneous, then wash with water, filter and dry. Perform primary ball milling on the dried silica and the first functional liquid at a weight ratio of 11:5. After ball milling, the first grinding liquid is obtained. S14: The primary grinding fluid and the secondary functional fluid are subjected to secondary ball milling at a weight ratio of 7:3. After ball milling, the mixture is filtered and dried to obtain the functional agent.

[0036] In this embodiment, the sodium alginate solution has a mass fraction of 5%; the yttrium nitrate solution has a mass fraction of 2%.

[0037] In this embodiment, the ball milling speed for the first-stage ball milling process is 1050 r / min, and the ball milling time is 2 hours; the ball milling speed for the second-stage ball milling process is 750 r / min, and the ball milling time is 5 hours.

[0038] This embodiment describes a construction method for high-viscosity ultra-thin overlay asphalt used for road maintenance, comprising the following steps: First, weigh the raw materials according to the weight proportions, mix the raw materials evenly to obtain high-viscosity ultra-thin overlay asphalt, spread the high-viscosity ultra-thin overlay asphalt to the road base layer with a paving thickness of 2cm, preheat the screed of the paver to 170℃, pave at a speed of 2m / min, then use an 8t steel wheel roller to compact it twice, and finally cure it naturally for 12 hours.

[0039] Example 2. This embodiment describes a high-viscosity, ultra-thin overlay asphalt for road maintenance, comprising the following raw materials by weight: 60 parts base asphalt, 11 parts terpene resin, 10 parts SBS elastomer, 7 parts silicate cement, 8 parts modified fiber agent, 7 parts functional agent, 4 parts silane agent, and 4 parts aggregate.

[0040] In this embodiment, the SBS elastomer is SBS-g-MAH; the base asphalt is 70# asphalt; the aggregate is crushed stone and sand with a mass ratio of 1:3, the crushed stone has a particle size of 15mm, the sand has a particle size of 0.5mm, and the silane agent is silane coupling agent KH560.

[0041] The modification method of the modified fiber agent in this embodiment is as follows: S01: Stir graphene thoroughly in a sufficient amount of 15% potassium permanganate solution, then wash with water, filter, and dry. Sonicate the dried graphene and ultrasonic fluid at a weight ratio of 5:9. After sonication, obtain an ultrasonic fluid containing graphene. S02: Silicon carbide fiber and basalt fiber are compounded in a weight ratio of 3:2, and then added to an ultrasonic liquid containing graphene at a weight of 8 times the total weight of silicon carbide fiber for impregnation treatment. After impregnation, the mixture is filtered and dried to obtain a fiber-graphene hybrid agent. S03: The fiber-graphene hybrid agent and the modified material were ball-milled at a weight ratio of 15:7 at a speed of 1500 r / min for 2 hours. After the ball milling was completed, the mixture was filtered and dried to obtain the modified fiber agent.

[0042] In this embodiment, the ultrasonic power for ultrasonic treatment is 400W, and the ultrasonic treatment lasts for 1 hour; the impregnation pressure for impregnation treatment is 15MPa, and the impregnation lasts for 1 hour.

[0043] The ultrasonic fluid in this embodiment comprises the following raw materials in parts by weight: Five parts of β-cyclodextrin, two parts of silane coupling agent KH550, seven parts of carbon nanotubes, three parts of mullite powder, and eight parts of 85% ethanol aqueous solution.

[0044] The modified material in this embodiment is prepared by mixing 8 parts of kaolin, 5 parts of lanthanum oxide and 7 parts of nanocellulose liquid evenly to obtain the modified material; the nanocellulose liquid is prepared by mixing nanocellulose and sodium lignosulfonate solution at a weight ratio of 2:8.

[0045] The sodium lignosulfonate solution in this embodiment has a mass fraction of 8%.

[0046] The preparation method of the functional agent in this embodiment is as follows: S11: Add 5 parts titanium dioxide, 8 parts dolomite, and 2 parts potassium feldspar to 10 parts sodium alginate solution and stir until homogeneous to obtain the first functional liquid; S12: Mix 8 parts calcium sulfate whiskers, 4 parts calcined talc powder and 3 parts yttrium nitrate solution evenly to obtain the second functional liquid; S13: Stir silica in a sufficient amount of 5% hydrochloric acid solution until homogeneous, then wash with water, filter and dry. Perform primary ball milling on the dried silica and the first functional liquid at a weight ratio of 11:7. After ball milling, the first grinding liquid is obtained. S14: The primary grinding fluid and the secondary functional fluid are subjected to secondary ball milling at a weight ratio of 7:5. After ball milling, the mixture is filtered and dried to obtain the functional agent.

[0047] In this embodiment, the sodium alginate solution has a mass fraction of 8%; the yttrium nitrate solution has a mass fraction of 5%.

[0048] In this embodiment, the ball milling speed for the first-stage ball milling process is 1150 r / min, and the ball milling time is 2 hours; the ball milling speed for the second-stage ball milling process is 850 r / min, and the ball milling time is 5 hours.

[0049] This embodiment describes a construction method for high-viscosity ultra-thin overlay asphalt used for road maintenance, comprising the following steps: First, weigh the raw materials according to the weight proportions, mix the raw materials evenly to obtain high-viscosity ultra-thin overlay asphalt, spread the high-viscosity ultra-thin overlay asphalt to the road base, the paving thickness is 4cm, the screed of the paver is preheated to 180℃, the paving speed is 3m / min, then a 10t steel wheel roller is used for final compaction 4 times, and finally natural curing is carried out for 12 hours.

[0050] Example 3. This embodiment describes a high-viscosity, ultra-thin overlay asphalt for road maintenance, comprising the following raw materials by weight: 57.5 parts base asphalt, 9 parts terpene resin, 8.5 parts SBS elastomer, 5.5 parts silicate cement, 6.5 parts modified fiber agent, 5.5 parts functional agent, 3 parts silane agent, and 3 parts aggregate.

[0051] In this embodiment, the SBS elastomer is SBS-g-MAH; the base asphalt is 70# asphalt; the aggregate is crushed stone and sand with a mass ratio of 1:2.5, the crushed stone has a particle size of 12.5mm, the sand has a particle size of 0.35mm, and the silane agent is silane coupling agent KH560.

[0052] The modification method of the modified fiber agent in this embodiment is as follows: S01: Stir graphene thoroughly in a sufficient amount of 12.5% ​​potassium permanganate solution, then wash with water, filter, and dry. Sonicate the dried graphene and ultrasonic fluid at a weight ratio of 5:8. After sonication, obtain an ultrasonic fluid containing graphene. S02: Silicon carbide fiber and basalt fiber are compounded in a weight ratio of 3:2, and then added to an ultrasonic liquid containing graphene at a weight ratio of 6.5 times the total weight of silicon carbide fiber for impregnation treatment. After impregnation, the mixture is filtered and dried to obtain a fiber-graphene hybrid agent. S03: The fiber-graphene hybrid agent and the modified material were ball-milled at a weight ratio of 13:7 at a speed of 1350 r / min for 2 hours. After the ball milling was completed, the mixture was filtered and dried to obtain the modified fiber agent.

[0053] In this embodiment, the ultrasonic power for ultrasonic treatment is 375W, and the ultrasonic treatment lasts for 1 hour; the impregnation pressure for impregnation treatment is 12.5MPa, and the impregnation lasts for 1 hour.

[0054] The ultrasonic fluid in this embodiment comprises the following raw materials in parts by weight: 3.5 parts β-cyclodextrin, 1.5 parts silane coupling agent KH550, 5.5 parts carbon nanotubes, 2.5 parts mullite powder, and 6.5 parts 85% ethanol aqueous solution.

[0055] The modified material in this embodiment is prepared by mixing 6.5 parts of kaolin, 3.5 parts of lanthanum oxide and 5.5 parts of nanocellulose liquid evenly to obtain the modified material; the nanocellulose liquid is prepared by mixing nanocellulose and sodium lignosulfonate solution at a weight ratio of 2:6.5.

[0056] The sodium lignosulfonate solution in this embodiment has a mass fraction of 6.5%.

[0057] The preparation method of the functional agent in this embodiment is as follows: S11: Add 3.5 parts of titanium dioxide, 6.5 parts of dolomite, and 1.5 parts of potassium feldspar to 8 parts of sodium alginate solution and stir until homogeneous to obtain the first functional liquid; S12: Mix 6.5 parts of calcium sulfate whiskers, 3 parts of calcined talc powder and 2.5 parts of yttrium nitrate solution evenly to obtain the second functional liquid; S13: Stir silica in a sufficient amount of 5% hydrochloric acid solution until homogeneous, then wash with water, filter and dry. Perform primary ball milling on the dried silica and the first functional liquid at a weight ratio of 11:6. After ball milling, the first grinding liquid is obtained. S14: The primary grinding fluid and the secondary functional fluid are subjected to secondary ball milling at a weight ratio of 7:4. After ball milling, the mixture is filtered and dried to obtain the functional agent.

[0058] In this embodiment, the sodium alginate solution has a mass fraction of 6.5%; the yttrium nitrate solution has a mass fraction of 3.5%.

[0059] In this embodiment, the ball milling speed for the first-stage ball milling process is 1100 r / min, and the ball milling time is 2 hours; the ball milling speed for the second-stage ball milling process is 800 r / min, and the ball milling time is 5 hours.

[0060] This embodiment describes a construction method for high-viscosity ultra-thin overlay asphalt used for road maintenance, comprising the following steps: First, weigh the raw materials according to the weight proportions, mix the raw materials evenly to obtain high-viscosity ultra-thin overlay asphalt, spread the high-viscosity ultra-thin overlay asphalt to the road base layer with a paving thickness of 3cm, preheat the paver screed to 1750℃, pave at a speed of 2.5m / min, then use a 9t steel wheel roller to compact it three times, and finally cure it naturally for 12 hours.

[0061] Comparative Example 1. Unlike Example 3, no modified fiber agent was added.

[0062] Comparative Example 2. Unlike Example 3, no graphene-containing ultrasonic liquid was added during the preparation of the modified fiber agent.

[0063] Comparative Example 3. Unlike Example 3, no nanotubes and mullite powder were added in the preparation of the graphene-containing ultrasonic fluid.

[0064] Comparative Example 4. Unlike Example 3, no modifier was added during the preparation of the modified fiber agent.

[0065] Comparative Example 5. Unlike Example 3, no functional agents were added.

[0066] Comparative Example 6. Unlike Example 3, dolomite and potassium feldspar were not added to the functional agent.

[0067] Comparative Example 7. Unlike Example 3, calcium sulfate whiskers and calcined talc were not added to the functional agent.

[0068] Examples 1-3 and Comparative Examples 1-7 underwent routine performance tests for crack resistance, bond strength, and compressive strength, while weather resistance was also tested (products were tested at UV intensity of 500 W / m). The irradiation was performed for 48 hours, followed by 12 hours at 75°C. This constituted one cycle, which was repeated 10 times. The test results are shown in the table below.

[0069] As can be seen from Examples 1-3 and Comparative Examples 1-7, the product of the present invention can achieve coordinated improvement in crack resistance, bonding strength and compressive strength, while the product has significant stability under weathering conditions. If neither of the modified fiber agent nor the functional agent is added to the product, the product's performance will deteriorate significantly. By using the combination of the two, the product's performance will be most significantly improved. In the preparation of modified fiber agents, no graphene-containing ultrasonic fluid was added; in the preparation of graphene ultrasonic fluid, no nanotubes and mullite powder were added; in the preparation of modified fiber agents, no modifiers were added; in the functional agents, no dolomite and potassium feldspar were added; and in the functional agents, no calcium sulfate whiskers and calcined talc were added. The performance of the products all tended to deteriorate. Only the modified fiber agents and functional agents obtained by the method of this invention have the most significant performance effects.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0071] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-viscosity, ultra-thin overlay asphalt for road maintenance, characterized in that, The asphalt comprises the following raw materials in parts by weight: 55-60 parts base asphalt, 8-11 parts terpene resin, 7-10 parts SBS elastomer, 4-7 parts silicate cement, 5-8 parts modified fiber agent, 4-7 parts functional agent, 2-4 parts silane agent, and 2-4 parts aggregate.

2. The high-viscosity ultra-thin overlay asphalt for road maintenance according to claim 1, characterized in that, The SBS elastomer is SBS-g-MAH; the base asphalt is 70# asphalt; the aggregate is selected as crushed stone and sand with a mass ratio of 1:(2-3), the crushed stone is crushed stone with a particle size of 10-15mm; the sand has a particle size of 0.2-0.5mm; the silane agent is silane coupling agent KH560.

3. The high-viscosity ultra-thin overlay asphalt for road maintenance according to claim 1, characterized in that, The modification method of the modified fiber agent is as follows: S01: Stir graphene thoroughly in a sufficient amount of potassium permanganate solution with a mass fraction of 10-15%, then wash with water, filter and dry. Sonicate the dried graphene and ultrasonic liquid at a weight ratio of 5:(7-9). After ultrasonication, obtain an ultrasonic liquid containing graphene. S02: Silicon carbide fiber and basalt fiber are compounded in a weight ratio of 3:2, and then added to an ultrasonic liquid containing graphene in a volume of 5-8 times the total weight of silicon carbide fiber for impregnation treatment. After impregnation, the mixture is filtered and dried to obtain a fiber-graphene hybrid agent. S03: Fiber-graphene hybrid agent and modified material are ball-milled at a weight ratio of (11-15):7, with a ball milling speed of 1200-1500 r / min for 2 hours. After ball milling, the mixture is filtered and dried to obtain the modified fiber agent.

4. The high-viscosity ultra-thin overlay asphalt for road maintenance according to claim 3, characterized in that, The ultrasonic treatment uses an ultrasonic power of 350-400W for 1 hour; the impregnation treatment uses an impregnation pressure of 10-15MPa for 1 hour.

5. The high-viscosity ultra-thin overlay asphalt for road maintenance according to claim 3, characterized in that, The modified material is prepared by mixing 5-8 parts of kaolin, 2-5 parts of lanthanum oxide and 4-7 parts of nanocellulose liquid evenly to obtain the modified material. The nanocellulose solution is prepared by mixing nanocellulose and sodium lignosulfonate solution at a weight ratio of 2:(5-8).

6. The high-viscosity ultra-thin overlay asphalt for road maintenance according to claim 5, characterized in that, The sodium lignosulfonate solution has a mass fraction of 5-8%.

7. The high-viscosity ultra-thin overlay asphalt for road maintenance according to claim 1, characterized in that, The preparation method of the functional agent is as follows: S11: Add 2-5 parts of titanium dioxide, 5-8 parts of dolomite, and 1-2 parts of potassium feldspar to 7-10 parts of sodium alginate solution and stir until homogeneous to obtain the first functional liquid; S12: Mix 5-8 parts of calcium sulfate whiskers, 2-4 parts of calcined talc powder and 2-3 parts of yttrium nitrate solution evenly to obtain the second functional liquid; S13: Stir silica in a sufficient amount of 5% hydrochloric acid solution until uniform, then wash with water, filter and dry. The dried silica and the first functional liquid are subjected to primary ball milling at a weight ratio of 11:(5-7). After ball milling, the first grinding liquid is obtained. S14: The primary grinding fluid and the secondary functional fluid are subjected to secondary ball milling at a weight ratio of 7:(3-5). After ball milling, the mixture is filtered and dried to obtain the functional agent.

8. The high-viscosity ultra-thin overlay asphalt for road maintenance according to claim 7, characterized in that, The sodium alginate solution has a mass fraction of 5-8%; the yttrium nitrate solution has a mass fraction of 2-5%.

9. The high-viscosity ultra-thin overlay asphalt for road maintenance according to claim 7, characterized in that, The ball milling process for the first-stage ball milling is carried out at a speed of 1050-1150 r / min for 2 hours; the ball milling process for the second-stage ball milling is carried out at a speed of 750-850 r / min for 5 hours.

10. A construction method for high-viscosity ultra-thin overlay asphalt for road maintenance as described in any one of claims 1-9, characterized in that, Includes the following steps: First, weigh the raw materials according to the weight proportions, mix the raw materials evenly to obtain high-viscosity ultra-thin overlay asphalt, spread the high-viscosity ultra-thin overlay asphalt to the road base, the paving thickness is 2-4cm, preheat the paver screed to 170-180℃, the paving speed is 2-3m / min, then use an 8-10t steel wheel roller to compact it 2-4 times, and finally cure it naturally for 12 hours.

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