Rubber powder modified asphalt composition for rapidly repairing pavement as well as preparation and application methods of rubber powder modified asphalt composition

Abstract

The invention relates to the field of road engineering materials, in particular to a rubber powder modified asphalt composition for quickly repairing a road surface and a preparation and application method thereof, and the rubber powder modified asphalt composition comprises the following components in parts by mass: 100 parts of matrix asphalt; 10 to 20 parts of activated rubber powder; 1-3 parts of a fast emulsifier; 25 to 40 parts of a water phase system; 1-3 parts of a micro-expansion auxiliary agent; 1-5 parts of a quick-drying binder; wherein the micro-expansion auxiliary agent is matched with the quick-drying binder, and is used for counteracting shrinkage stress generated when the quick-drying binder is cured through a controlled expansion reaction under the action of a water phase system. According to the invention, the combination of super-early traffic opening and excellent long-term service performance is realized, the extremely high efficiency of opening traffic within 30 minutes is realized, the traffic jam and social economic cost caused by road maintenance are greatly reduced, and the method is particularly suitable for rapid first-aid repair of urban main roads, expressways and other scenes with extremely high traffic efficiency requirements.

Description

Technical Field

[0001] This invention relates to the field of road engineering materials, and specifically to a rubber-modified asphalt composition for rapid road surface repair, as well as its preparation and application methods. Background Technology

[0002] Asphalt pavement has become the mainstream paving form for urban roads, highways and rural roads due to its advantages such as high smoothness, good driving comfort and convenient construction. With the acceleration of urbanization and the explosive growth of traffic volume, asphalt pavement has been subjected to the dual effects of heavy vehicles, high frequency of rolling and extreme weather for a long time, and the problems of potholes, cracks and peeling of asphalt pavement are becoming increasingly serious.

[0003] Traditional repair techniques primarily rely on hot patching, whose core advantage lies in the good compatibility between hot asphalt mixtures and old pavement asphalt. A stable structure can be formed within 1-2 days after repair, exhibiting strong durability, making it suitable for large-scale, planned pavement maintenance projects. However, it suffers from problems such as long construction cycles, complex operations, strong equipment dependence, and high energy consumption, especially in low-temperature, humid, or emergency situations where timely repairs are difficult to carry out. To address these challenges, cold patching asphalt materials have been proposed and widely applied.

[0004] However, existing cold patch materials generally suffer from the following problems, resulting in insufficient repair quality and long-term stability, making it difficult to meet the maintenance requirements of high-demand pavements: Existing cold patch materials rely on the slow demulsification and curing of asphalt emulsions, requiring 3-7 days of curing before normal traffic can resume; in rainy areas, warning signs need to be set up repeatedly during the curing period, and the repair layer is prone to deformation due to accidental vehicle traffic, leading to a high rate of secondary repairs; the asphalt emulsion in cold patch materials has insufficient wetting properties at the interface with the old pavement, especially when the old pavement surface is dusty or damp, making it difficult to achieve the required bonding strength. After 1-3 months of traffic resumption, delamination is likely to occur at the interface between the repair layer and the old pavement. The asphalt film of existing cold-patch materials is thin and lacks anti-water stripping components. Under the action of rainwater soaking or freeze-thaw cycles, the Marshall stability will decrease, and the loosening rate of the repaired area within one year is much higher than that of hot-patch materials. The asphalt emulsion and aggregate in cold-patch materials are prone to segregation, and the storage period is only 3 to 6 months. After the storage period, the aggregate will sink and the asphalt will float, resulting in insufficient uniformity of the material after on-site mixing. At the same time, the types and amounts of emulsifiers vary greatly among different manufacturers. Some products have a slow curing speed due to excessive emulsifier, or the emulsion breaks down too quickly due to insufficient emulsifier, resulting in large fluctuations in on-site construction quality.

[0005] Therefore, there is an urgent need to develop a rubber powder emulsified asphalt repair material and its supporting construction structure that features rapid curing, high initial strength, good adhesion, strong durability, and wide environmental adaptability.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the present invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The first objective of this invention is to provide a rubber-modified asphalt composition for rapid road repair. The material composition and structural design enable efficient and rapid repair of road defects, and are particularly suitable for treating shallow damage such as sudden potholes and surface spalling.

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A rubber-modified asphalt composition for rapid road surface repair, comprising the following components in parts by weight: 100 parts base asphalt; 10-20 parts activated rubber powder; 1-3 parts rapid emulsifier; 25-40 parts aqueous system; 1-3 parts micro-expansion additive; 1-5 parts fast-drying binder; Among them, the micro-expansion additive is used in combination with the fast-drying adhesive to counteract the shrinkage stress generated during the curing of the fast-drying adhesive through a controlled expansion reaction under the action of the aqueous system.

[0009] The micro-expansion additive undergoes a hydration reaction in an aqueous system to generate Ca(OH)2 and Mg(OH)2, accompanied by volume expansion. During the curing process of the fast-drying adhesive, shrinkage stress is generated due to water evaporation and polymer film formation. By adjusting the composition and conditions, the hydration reaction of the micro-expansion additive is synchronized with the curing process of the fast-drying adhesive. The expansion stress of the micro-expansion additive precisely offsets this shrinkage, thereby reducing internal stress concentration.

[0010] This invention effectively prevents cracking or detachment of the repair layer due to shrinkage, and improves the adhesion strength and volume stability with the old pavement. Simultaneously, the composition achieves rapid curing, allowing traffic to resume within 30 minutes, significantly reducing the impact of road maintenance on traffic.

[0011] Preferably, the micro-expansion agent is a composite powder of CaO and MgO, wherein the mass ratio of CaO to MgO is 70~85:15~30. The reactive powders of CaO and MgO can form a microcrystalline structure during water absorption, enhancing the pore-filling and structural support properties of the material. CaO hydrates faster than MgO. When the two are combined at a mass ratio of 70~85:15~30, CaO provides rapid initial expansion, while MgO provides sustained expansion in the later stages, forming a stepped expansion curve. This better matches the curing shrinkage of the fast-drying adhesive, improving the overall density and early support capacity of the material, and effectively preventing secondary settling and cracking.

[0012] Preferably, the composite powder is coated with stearic acid at a coating amount of 0.5-2%. After coating, the median D50 particle size of the powder is 5-20 μm, and the D98 particle size is ≤50 μm. Its initial hydration activity reaches its peak in 30℃ deionized water within 5-15 minutes. The stearic acid coating forms a hydrophobic layer on the powder, delaying the contact between water molecules and the powder, preventing premature hydration of the micro-expansion additive before storage or application, ensuring that the expansion reaction occurs when needed. Particle size control increases the specific surface area and reaction efficiency of the powder, resulting in a more uniform distribution of expansion stress, which helps to improve the stability and performance consistency of the repair material.

[0013] Preferred fast-drying adhesive is a low-temperature film-forming acrylic copolymer emulsion, which has an initial setting time of less than 15 minutes at room temperature and reaches structural strength within 2 hours. The fast-drying adhesive provides rapid initial bonding force, enabling the repair material to gain strength in a short time and support early traffic loads. The acrylic emulsion has good flexibility and adhesion, which helps to improve the bonding between the repair layer and the old pavement and resist stress caused by temperature changes, significantly improving the bonding strength and water stripping resistance of the new and old materials.

[0014] Preferably, a small amount of inorganic salts or stabilizers can be further added to the aqueous phase system to enhance the emulsification stability and workability of the system. The aqueous phase system comprises the following components in parts by weight: 100 parts water; 0.1-0.5 parts pH adjuster; 0.5-2 parts stability aid; and 0-1 parts demulsifier. This ensures the storage stability and workability of the composition.

[0015] Preferably, the pH adjuster is hydrochloric acid or acetic acid, which is used to adjust the pH value of the aqueous system to 2-4 in order to maintain the stability of the asphalt emulsion and prevent flocculation or demulsification during the asphalt emulsification process. Preferably, the stabilizing agent is polyvinyl alcohol or sodium carboxymethyl cellulose. The stabilizing agent prevents the emulsion from separating by thickening or emulsifying, thus extending the emulsion life. As a preferred demulsifier, CaCl2 is used, which allows the emulsion to demulsify rapidly after compaction, promoting early strength formation.

[0016] Preferably, the activated rubber powder is made from 60-mesh waste tire rubber granules through graft modification with a silane coupling agent. It possesses good dispersibility and polar reactivity, improving interfacial compatibility with asphalt matrix and binders. The amount of silane coupling agent used is 1-3% of the rubber granule mass. The silane coupling agent is KH-550 or KH-570. The silane coupling agent undergoes hydrolysis and condensation reactions on the surface of the rubber granules, forming siloxane bonds that bond with the rubber surface. Simultaneously, the functional groups at the other end react with the polar components in the asphalt, achieving graft modification. This improves the compatibility between the rubber powder and asphalt, giving the modified asphalt better high-temperature stability and low-temperature crack resistance. Furthermore, the use of waste tire rubber powder achieves resource utilization, making it environmentally friendly and economical.

[0017] Preferably, the activated rubber powder is prepared by the following method: A silane coupling agent was dissolved in an ethanol-water mixture, and the pH was adjusted to 4.5 to obtain an ethanol-water solution of the silane coupling agent, wherein the concentration of the silane coupling agent was 2.0 wt%. 60-mesh waste tire rubber powder was cleaned and dried, and then sprayed with the ethanol-water solution of the silane coupling agent at 80-85℃ for 40-60 min. Subsequently, it was dried and cured at 100-110℃ to obtain activated rubber powder.

[0018] Preferred fast-acting emulsifiers are cationic emulsifiers. Cationic emulsifiers utilize electrostatic adsorption between the positively and negatively charged aggregate surfaces, allowing the asphalt emulsion to quickly and firmly coat the aggregate surface and adhere tightly to the cleaned pit interface, ensuring excellent durability and waterproofing of the repair layer. For example, 1631 chlorine-based fast-cracking cationic asphalt emulsifier, whose main component is hexadecyltrimethylammonium chloride, is suitable for applications requiring normal temperature construction and rapid traffic reopening.

[0019] As a preferred option, the rubber-modified asphalt composition, after being compacted at 25°C, can be opened to traffic within 30 minutes, significantly improving maintenance efficiency and reducing traffic congestion. Its bonding strength with the original pavement is not less than 1.2 MPa, ensuring a firm bond between the repair layer and the old pavement. Its water stripping resistance rate is not less than 90%, providing excellent waterproof performance and extending the service life of the pavement.

[0020] The second objective of this invention is to provide a method for preparing a rubber-modified asphalt composition for rapid road repair. The resulting composition can be premixed, packaged, and transported in a factory. At the construction site, it can be rapidly mixed with graded aggregate at room temperature and directly filled into cleaned potholes, then compacted and leveled. The material initially sets within 15 minutes and can be opened to traffic within 2 hours.

[0021] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A method for preparing a rubber powder modified asphalt composition for rapid road surface repair includes the following steps: S1 Heat 100 parts of base asphalt to 115~125℃, slowly add 10~20 parts of activated rubber powder, stir for more than 30 minutes to form a homogeneous rubber asphalt premix B; S2 cools the rubber asphalt premix B to 55~65℃, then adds 1~3 parts of cationic emulsifier and 25~40 parts of aqueous system in sequence, and stirs and emulsifies thoroughly to form an emulsion base material to prevent the asphalt from curing too early. S3 involves pre-mixing 1-3 parts of micro-expansion additive with 1-5 parts of fast-drying binder to form a slurry-like premix A; this avoids the micro-expansion additive from directly contacting the aqueous phase and prematurely hydrating. S4. Add the slurry premix A to the emulsion base material obtained in step S2, and shear and stir for 8-15 minutes to form a rubber powder modified asphalt composition.

[0022] This preparation method ensures the compatibility of the components and the controllability of the reaction. The stepwise processing prevents premature hydration of the micro-expansion additive and premature curing of the fast-drying binder, ensuring the storage stability and workability of the composition. The emulsification process makes the material easy to apply and compact.

[0023] The third objective of this invention is to provide a method for applying a rubber-modified asphalt composition for rapid road repair, wherein the composition is mixed with graded aggregates to prepare an asphalt mixture for rapid repair of road surface distress areas.

[0024] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A method for applying a rubber-modified asphalt composition for rapid road surface repair includes the following steps: Cut, reshape, and clean the damaged areas of the road surface to create regular potholes, ensuring that the interface is free of loose material and moisture; Apply an interface adhesive evenly to the cleaned pit surface and sidewalls. The interface adhesive is a fast-drying adhesive in the composition or an acrylic emulsion compatible with it. After spraying, let it stand for 3-5 minutes until it is surface dry. The rubber-modified asphalt composition is mixed with dry graded aggregate to form an asphalt mixture. The asphalt mixture is then filled into the treated pit, leveled, and compacted. After compaction and leveling, a surface sealing layer is applied to the repaired area. After curing in a natural environment for no more than 30 minutes, the area can be opened to traffic.

[0025] As a preferred method, manual compaction or small vibratory compaction equipment is used to ensure that the structural density is ≥95%.

[0026] Preferably, the aggregate is 3-5mm graded crushed stone; in the asphalt mixture, the mass ratio of base asphalt to aggregate is 1:2-3. This ensures that the asphalt mixture has good workability, mechanical strength and durability, supports rapid compaction and early strength development in rapid repair scenarios, and provides sufficient resistance to rutting and water damage.

[0027] Compared with the prior art, the present invention has the following beneficial effects: In this invention, the synergistic effect of the micro-expansion additive and the fast-drying adhesive allows the fast-drying adhesive to achieve rapid initial setting at room temperature, meeting the basic requirements for rapid repair. The controlled expansion reaction initiated by the micro-expansion additive in the aqueous system precisely matches the shrinkage rhythm and amount of the fast-drying adhesive. The stress generated by moderate expansion cancels out the shrinkage stress, fundamentally preventing the generation of micro-cracks during the curing stage and ensuring that the repair layer has a dense and void-free internal structure after curing. Furthermore, it enhances the interfacial adhesion between the repair layer and the original pavement, helping to improve the overall bonding strength and reduce the risk of delamination.

[0028] This invention combines ultra-early traffic opening with excellent long-term service performance. Due to the presence of a fast-drying binder and a controllable demulsification aqueous phase system in the system, the material can quickly form initial strength after compaction, overcoming the shortcomings of traditional hot-mix asphalt requiring long cooling time or emulsified asphalt requiring long demulsification and dehydration time. It achieves extremely high operational efficiency of opening traffic within 30 minutes, greatly reducing traffic congestion and socio-economic costs caused by road maintenance. It is particularly suitable for rapid emergency repairs in scenarios with extremely high requirements for traffic efficiency, such as urban main roads and highways. Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, features, and effects of a rubber-modified asphalt composition for rapid road surface repair, and its preparation and application methods, are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0030] The commercially available sources of each component used in the experiment are shown in Table 1 below: Table 1 Example 1: A rubber-modified asphalt composition for rapid road surface repair, comprising the following components in parts by weight: 100 parts base asphalt; 15 parts activated rubber powder; 2.5 parts rapid emulsifier; 30 parts aqueous system; 1.5 parts micro-expansion additive; 3 parts fast-drying binder; The micro-expansion additive, used in conjunction with the fast-drying adhesive, counteracts the shrinkage stress generated during the curing of the fast-drying adhesive through a controlled expansion reaction in an aqueous system. The micro-expansion additive is a composite powder of CaO and MgO, with a mass ratio of 80:20. The composite powder is coated with stearic acid at a level of 1.5%. After coating, the median D50 particle size is 15 μm, and the D98 particle size is ≤50 μm. Its initial hydration activity reaches its peak in 30℃ deionized water within 10 minutes. The fast-drying adhesive is a low-temperature film-forming acrylic copolymer emulsion with an initial setting time of less than 15 minutes at room temperature and reaches structural strength within 2 hours.

[0031] The aqueous phase system comprises the following components in parts by weight: 100 parts water; 0.3 parts hydrochloric acid; 1.2 parts polyvinyl alcohol; and 0.5 parts CaCl2.

[0032] The activated rubber powder is made from 60-mesh waste tire rubber particles through KH-550 graft modification. The activated rubber powder is prepared by the following method: KH-550 is dissolved in an ethanol-water mixture, and the pH is adjusted to 4.5 to obtain a silane coupling agent ethanol-water solution, wherein the concentration of KH-550 is 2.0wt%; the 60-mesh waste tire rubber powder is cleaned and dried, and then sprayed with the silane coupling agent ethanol-water solution at 80℃ for 50 min, and then dried and cured at 105℃ to obtain the activated rubber powder.

[0033] The fast-acting emulsifier is 1631 chlorine-type fast-cracking cationic asphalt emulsifier, whose main component is hexadecyltrimethylammonium chloride, and it is suitable for construction at room temperature and for rapid opening to traffic.

[0034] A method for preparing a rubber powder modified asphalt composition for rapid road surface repair includes the following steps: S1 Heat 100 parts of base asphalt to 120°C, and slowly add 15 parts of activated rubber powder while continuously stirring. Stir for more than 30 minutes to form a homogeneous rubber asphalt premix B. S2 cools the rubber asphalt premix B to 60°C, then adds 2.5 parts of cationic emulsifier and 30 parts of aqueous system in sequence, and stirs and emulsifies thoroughly to form an emulsion base material to prevent the asphalt from curing too early; S3 involves pre-mixing 1.5 parts of micro-expansion additive with 3 parts of fast-drying binder to form a slurry-like premix A; this avoids the micro-expansion additive from directly contacting the aqueous phase and prematurely hydrating. S4. Add the slurry premix A to the emulsion base material obtained in step S2, and shear and stir for 10 minutes to form a rubber powder modified asphalt composition.

[0035] Three potholes were selected in a typical aging asphalt road area in a northern city for repair testing. The depth of the potholes was approximately 3-5 cm, and the area was 0.3-0.5 m². During construction, the air temperature was 12℃ and the relative humidity was approximately 65%, which is a cold and damp environment in early spring. The application method of this rubber-modified asphalt composition for rapid road repair includes the following steps: Use a joint cutter to cut and reshape the damaged areas of the road surface (such as potholes, peeling, etc.) and clean up loose particles, dust and water to form regular potholes and ensure that there are no loose materials and moisture at the interface. After cleaning, the surface and sidewalls of the pit are uniformly sprayed with an interface adhesive, which is a fast-drying adhesive in the composition or an acrylic emulsion compatible with it. After spraying, let it stand for 5 minutes until it is surface dry. The rubber-modified asphalt composition is mixed with dry graded aggregate at a mass ratio of 1:2.5 to form an asphalt mixture. The asphalt mixture is then filled into the treated pits and spread and leveled in layers using manual shovels. Subsequently, it is compacted 2-3 times using a plate compactor and vibratory roller to ensure that the structural density is ≥95%. After compaction and leveling, a surface sealing layer is applied to the repaired area. After curing in a natural environment for no more than 30 minutes, the area can be opened to traffic.

[0036] Example 2: The difference between this embodiment and Embodiment 1 is that, 100 parts of base asphalt; 20 parts of activated rubber powder; 3 parts of fast emulsifier; 25 parts of aqueous system; 1 part of micro-expansion additive; 1 part of fast-drying binder; the rest are the same as in Example 1, and will not be repeated here.

[0037] Example 3: The difference between this embodiment and Embodiment 1 is that, 100 parts of base asphalt; 10 parts of activated rubber powder; 1 part of fast emulsifier; 40 parts of aqueous system; 3 parts of micro-expansion additive; 5 parts of fast-drying binder; the rest are the same as in Example 1, and will not be repeated here.

[0038] Comparative Example 1: Using traditional cold patching materials, specifically including: 100 parts base asphalt (70# road petroleum asphalt); 10 parts rubber powder (unmodified 60-mesh waste tire rubber powder); 2 parts emulsifier (ordinary slow-cracking cationic asphalt emulsifier, such as slow-cracking CRS-1); 30 parts aqueous system (100 parts water, 0.2 parts hydrochloric acid, 0.5 parts polyvinyl alcohol, excluding CaCl2); aggregate: graded crushed stone, with a mass ratio of 1:2.5 to asphalt (similar to the example).

[0039] The difference between this comparative example and Example 1 is that it does not use micro-expansion additives and fast-drying binders. The preparation method of this rubber powder modified asphalt composition includes the following steps: S1 Heat 100 parts of base asphalt to 120°C, and slowly add 15 parts of activated rubber powder while continuously stirring. Stir for more than 30 minutes to form a homogeneous rubber asphalt premix B. S2 cools the rubber asphalt premix B to 60°C, then adds 2.5 parts of cationic emulsifier and 30 parts of aqueous system in sequence, and stirs and emulsifies thoroughly to form an emulsion base material to prevent the asphalt from curing too early; S3. The emulsion base material obtained in step S2 is sheared and stirred for 10 minutes to form a uniform rubber powder modified asphalt composition.

[0040] Performance testing The asphalt mixtures prepared by mixing the rubber-modified asphalt composition in the examples with graded aggregates were compared with those in the comparative example. The results are shown in Table 2 below: Table 2. Comparison of some performance indicators of asphalt mixtures in the examples and comparative examples. Note: -- indicates that the standard test cannot be carried out due to poor material properties or inability to be effectively molded.

[0041] Table 2 shows the test results: the asphalt mixture in this example has a short initial setting time, and its compressive strength reaches the standard within 2 hours, demonstrating good rapid molding capability. After 7 days of water immersion, the peeling rate of the bonding layer meets the water loss resistance requirements of the "Highway Maintenance Technical Specifications". After 14 days of curing, no delamination, bulging, or cracking was observed after 50 simulated manual compaction cycles, exhibiting excellent field stability and environmental adaptability. The cold-mix repair asphalt mixture prepared using the rubber-modified asphalt composition proposed in this invention for road repair not only has a short construction time and convenient operation, enabling effective repair in a short time, but also exhibits good overall waterproofing, wear resistance, and environmental adaptability. Furthermore, the mixture meets the relevant specifications in terms of stability and flowability.

[0042] In Comparative Example 1, a traditional cold patching material was used, and its performance indicators were inferior to those of the other examples. This is because the material relies on the slow natural demulsification of emulsified asphalt and lacks a rapid curing and anti-shrinkage mechanism, resulting in low early strength, slow molding, and poor interfacial adhesion.

[0043] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A rubber-modified asphalt composition for rapid road surface repair, characterized in that, The components include the following parts by weight: 100 parts base asphalt; 10-20 parts activated rubber powder; 1-3 parts rapid emulsifier; 25-40 parts aqueous system; 1-3 parts micro-expansion additive; 1-5 parts fast-drying binder; The micro-expansion additive works in conjunction with the fast-drying adhesive to counteract the shrinkage stress generated during the curing of the fast-drying adhesive through a controlled expansion reaction under the action of the aqueous system.

2. The rubber-modified asphalt composition for rapid road surface repair according to claim 1, characterized in that, The micro-expansion additive is a composite powder of CaO and MgO, wherein the mass ratio of CaO to MgO is 70~85:15~30.

3. The rubber-modified asphalt composition for rapid road surface repair according to claim 2, characterized in that, The composite powder is coated with stearic acid with a coating amount of 0.5-2%. After coating, the median D50 particle size of the powder is 5-20 μm, the D98 particle size is ≤50 μm, and its initial hydration activity reaches its peak in 30℃ deionized water in 5-15 min.

4. The rubber-modified asphalt composition for rapid road surface repair according to claim 1, characterized in that, The fast-drying adhesive is a low-temperature film-forming acrylic copolymer emulsion, and its initial setting time at room temperature is less than 15 minutes.

5. The rubber-modified asphalt composition for rapid road surface repair according to claim 1, characterized in that, The aqueous phase system comprises the following components in parts by weight: 100 parts water; pH adjuster 0.1~0.5 parts; Stabilizing agent 0.5-2 parts; demulsifier 0-1 part.

6. The rubber-modified asphalt composition for rapid road surface repair according to claim 1, characterized in that, The activated rubber powder is made from 60-mesh waste tire rubber particles through graft modification with a silane coupling agent, and the amount of the silane coupling agent is 1-3% of the mass of the rubber particles.

7. The rubber-modified asphalt composition for rapid road surface repair according to claim 1, characterized in that, After being compacted at 25°C, the modified asphalt composition can be opened to traffic within 30 minutes, with a bonding strength to the original road surface of not less than 1.2 MPa and a water stripping resistance of not less than 90%.

8. The method for preparing the rubber-modified asphalt composition for rapid road surface repair according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1 Heat the base asphalt to 115~125℃, slowly add activated rubber powder, stir for more than 30 minutes to form a homogeneous rubber asphalt premix B; S2 cools the rubber asphalt premix B to 55~65℃, then adds the cationic emulsifier and the aqueous system in sequence, and stirs and emulsifies thoroughly to form an emulsion base material; S3 pre-mixes the micro-expansion additive with the fast-drying binder to form a slurry-like premix A; S4. The slurry premix A is added to the emulsion base material and sheared and stirred for 8-15 minutes to form a rubber powder modified asphalt composition.

9. The method of applying the rubber-modified asphalt composition for rapid road repair according to any one of claims 1 to 7, characterized in that, The following steps are included: Cut, reshape, and clean the damaged areas of the road surface; Apply an interface adhesive evenly to the cleaned pit surface and sidewalls, and allow it to stand until surface dry after spraying. The rubber-modified asphalt composition is mixed with dry aggregate to form an asphalt mixture, which is then filled into a treated pit, leveled, and compacted. Apply a surface sealant to the repaired area, and then allow it to cure in a natural environment for no more than 30 minutes before opening it to traffic.

10. The method of applying the rubber-modified asphalt composition for rapid road surface repair according to claim 9, characterized in that, In the asphalt mixture, the mass ratio of the base asphalt to the aggregate is 1:2~3.

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