Chlorine salt corrosion resistant rubber modified asphalt pavement pit slot repairing composite process

Abstract

The invention discloses a compound technology for repairing pits in a rubber modified asphalt pavement resistant to chlorine salt corrosion, and aims to solve the problems of interface stripping and short repairing life caused by chlorine salt corrosion in a traditional repairing technology. The invention innovatively provides a debridement-interface activation-bionic filling three-order repair system. The three-order repair system is characterized in that (1) a high-pressure cyclone debridement device is adopted to remove loose chippings and form a rough interface; (2) an anti-chloride ion bonding layer containing a nano silane coupling agent is sprayed, the penetration depth reaches 3-5 mm, and a chemical barrier is formed; and (3) filling a rubber modified asphalt mixture in a layered manner, and carrying out gradient compaction within 30-50Hz by matching with a frequency-adjustable vibratory roller. The interface strength is improved through dual effects of molecular bonding and mechanical interlocking, dual anchoring of chemical bonding and mechanical occlusion effects of the repairing layer and the original pavement is realized, the interface bonding strength is improved, the service life of the repairing layer is prolonged, the technical problem that the pit slot repairing layer is easy to debond and lose efficacy in a chlorine salt environment is effectively solved, and the repairing effect is improved. The method is suitable for rapid repair of pavement diseases in coastal areas and road sections using a lot of snow-melting agents in winter.

Description

Technical Field

[0001] The present invention relates to a rubber-modified asphalt mixture pothole repair process based on interface activation theory, in particular to a chloride-resistant rubber-modified asphalt pavement pothole repair composite process, belonging to the technical field of road engineering maintenance. Background Art

[0002] In the field of road maintenance engineering, the problem of secondary failure after asphalt pavement pothole repair has long existed, seriously restricting the repair effect of the pavement. Especially in areas where chloride salt deicing agents are frequently used in winter, the repair layer is penetrated by the corrosive medium, which is prone to bond failure, delamination and other diseases, resulting in premature deterioration of the repair structure. Interface bond failure is the main failure mode, which is manifested as follows: (1) The debris remaining at the repair interface forms a weak bond transition zone with the pollutants, significantly weakening the synergistic load-bearing capacity of the new and old materials; (2) After chloride ions penetrate the interface through the microcracks of the old pavement, they induce electrochemical corrosion reactions on the aggregate surface and accelerate the irreversible attenuation of the interface bonding performance; (3) The interlayer bond strength continues to decline under the long-term effects of the environment and load, further exacerbating the risk of separation between the repair layer and the substrate. The above problems not only lead to frequent repeated repairs and increase maintenance costs, but also cause a double loss of social and economic benefits due to the interruption of road traffic. It is urgent to achieve a fundamental breakthrough through technological innovation.

[0003] The current mainstream repair process has systematic defects at the technical level: (1) Traditional hot-mix asphalt repair relies on high-temperature heating of the interface to improve adhesion, but high-temperature operation can easily cause aging and brittleness of the old pavement asphalt material, resulting in damage to the interface microstructure. The shear strength of the repaired interface is significantly deteriorated, making it difficult to meet long-term service requirements; (2) Although cold-mix asphalt materials have broken through the ambient temperature limit, their interface binders have insufficient barrier efficiency against chloride ions and poor molecular compatibility with aged asphalt, which can easily cause the overall failure of the repair layer due to interface delamination; (3) Existing cleaning processes mostly rely on mechanical grooving and manual cleaning, which are inefficient in removing submillimeter debris and pollutants. Residues form local stress concentration points, which become potential inducers of interface delamination. In addition, conventional compaction equipment uses fixed vibration parameters and cannot dynamically adjust the excitation mode according to the mixture gradation and rheological properties, resulting in asynchronous compaction of coarse and fine aggregates, forming a porosity gradient within the repair layer, and reducing the structural integrity.

[0004] The existing technology system has not yet broken through three core obstacles: (1) The debridement process lacks a selective removal mechanism, making it difficult to completely remove loose debris while preserving a healthy matrix; (2) The interface treatment remains at the physical roughening level, without establishing a dual protection of chemical barrier and molecular bonding; (3) The compaction process is mismatched with the rheological properties of the material, and high-frequency vibration induces secondary segregation of aggregates. Especially in the chloride erosion environment, traditional silicate-based interface waterproofing agents will react with the invading Cl -A replacement reaction occurs to generate expansive Friedel salt (volume expansion rate 12-18%), which accelerates the interface debonding process. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to address the shortcomings of existing pothole repair technologies in terms of interface cleanliness, interface bonding durability and compaction quality, and to provide a composite process for pothole repair of rubber-modified asphalt pavement that is resistant to chloride erosion. By constructing a three-stage repair system of "debridement-interface activation-bionic filling", a gradient protective interface structure that can block the erosion and migration of chloride ions is established, and dual anchoring of the repair layer and the original pavement through chemical bonding and mechanical bite is achieved, thereby improving the interface bonding strength. Furthermore, a dynamic compaction process adapted to the rheological properties of rubber-modified asphalt is developed to ensure high density and uniformity of the repair mixture. The process is suitable for rapid repair of pavement diseases in coastal areas and sections where snow-melting agents are used extensively in winter.

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows: A composite process for repairing potholes on rubber-modified asphalt pavements that resist chloride and salt corrosion includes the following three steps: A. Debridement stage: Use a high-pressure cyclone debridement device to clean the pit, use high-speed airflow to flush out loose debris, and roughen the bottom and edges of the pit to form a clean and rough repair interface; B. Interface activation stage: Spray an interface adhesive containing a nano-silane coupling agent on the cleaned pothole interface, allowing it to penetrate into the original road surface material to a depth of 3 to 5 mm, and chemically react with the matrix material to form an organic-inorganic hybrid membrane with Si-O-Si covalent bonds and quaternary ammonium salt cationic groups, thereby constructing a chloride ion migration barrier. C. Bionic filling stage: Fill in rubber-modified asphalt mixture in layers and use frequency-adjustable vibration compaction equipment to compact it stage by stage. Through low-frequency, medium-frequency and high-frequency graded vibration, each level of aggregate is fully densely interlocked to form a repair layer that is firmly bonded to the original road surface and highly dense.

[0007] Preferably, the high-pressure cyclone debridement device uses compressed air to generate an airflow of 0.8 to 1.2 MPa through a Venturi accelerator tube, and sprays it at high speed from a nozzle with a diameter of Φ6 to 8 mm and a spray angle of 60 to 75 degrees to clean the pits and grooves. The local negative pressure generated by the Venturi tube is used to absorb debris, so that the residual debris removal rate at the pit and groove interface is ≥98%, and the surface roughness Ra is 1.2 to 1.8 μm.

[0008] Preferably, the nano-silane coupling agent is γ-aminopropyltriethoxysilane, with a mass concentration of 2% to 5%, and contains 0.5% to 1.5% of a quaternary ammonium salt modifier; the interfacial adhesive containing the nano-silane coupling agent adopts a two-component on-site mixing spraying process, component A is a pre-prepared silane coupling agent solution, and component B is an organic acid catalyst solution with a pH of 4.5. When used, components A and B are mixed at the nozzle and evenly sprayed on the pit surface at a spraying rate of 300 to 400 g / m² to form a thin and uniform activation coating. Driven by capillary action, the activation coating penetrates downward to form a gradient transition zone with a penetration depth of 3 to 5 mm. After the penetrating silane molecules undergo a hydrolysis and condensation reaction with the substrate, a two-stage curing process is adopted to form a dense silicon-oxygen network film at the pit interface.

[0009] Preferably, the rubber modified asphalt mixture comprises the following components: (1) Base asphalt: 70# asphalt, needle penetration 60-80 (0.1mm); (2) Waste tire rubber powder: 40 mesh fineness, the dosage is 18-22% of the base asphalt weight; (3) Composite stabilizer: the dosage is 0.3-1.0% of the weight of the base asphalt; Aggregate gradation adopts discontinuous gradation S-shaped curve, and the void ratio is controlled at 2-4%.

[0010] Preferably, the preparation process of the rubber modified asphalt mixture comprises the following steps: (1) Matrix asphalt pretreatment: Heat 70# matrix asphalt to a molten state of 160-170℃ and keep the temperature constant for standby use; (2) Rubber powder pretreatment: Place the 40-mesh waste tire rubber powder in an oven at 105±5℃ and dry it for 2 to 3 hours to remove surface moisture; (3) Gradient miscibility: Add pretreated rubber powder to the molten asphalt at a stirring rate of 800-1200 r / min in three batches, with an interval of 5-8 minutes between each batch, and control the total mixing amount to 18-22% of the asphalt mass; (4) High-speed shear modification: transfer the mixture to a shear emulsifier and shear at a rate of 4000-5000 r / min for 45-60 minutes at 180-185°C; (5) Swelling development: After shearing, transfer to the development tank and develop at a low speed of 170-175°C and 200-300 r / min for 2-3 hours; (6) Stabilization treatment: Add silane coupling agent at a concentration of 0.3-1% by mass of asphalt as a stabilizer, and continue stirring for 20-30 minutes until the system is homogenized and ready for use.

[0011] Preferably, in the graded vibration, the frequency and amplitude of the vibration compaction are: 30-35 Hz, 2-3 mm in the low-frequency stage; 40-45 Hz, 1-1.5 mm in the medium-frequency stage; 50-55 Hz, 0.5-0.8 mm in the high-frequency stage, and the temperature and modulus of the mixture are monitored in real time during the compaction process, and the vibration parameters are adjusted through closed-loop control.

[0012] Preferably, the two-stage curing process comprises the following steps: in the first stage, natural curing is performed at room temperature for 20 minutes to allow the silane to gradually hydrolyze and initially polymerize to build a three-dimensional Si-O-Si network skeleton; in the second stage, hot air at about 60°C is used to assist in curing the interface layer for 10 minutes to promote condensation bonding reactions between functional groups such as -NH2 in the silane molecules and asphaltene.

[0013] Preferably, the high-pressure cyclone debridement device includes a spray gun body, a venturi tube, a high-precision infrared positioning system, a high-speed nozzle, a multi-stage acceleration nozzle and a self-spinning debris collection bin; a compressed air inlet is provided at the rear of the spray gun body, and the compressed air inlet is connected to an external compressed air source through a hose; the venturi tube is arranged inside the spray gun body, and the length-to-diameter ratio of its throat is 8:1, which is used to accelerate the compressed air to form a high-speed and high-pressure airflow; the multi-stage acceleration nozzle is connected to the venturi tube, and has a conical step-by-step contraction structure for further increasing the airflow speed; the high-speed nozzle is connected to the end of the multi-stage acceleration nozzle; the self-spinning debris collection bin is arranged at the lower side of the spray gun body, for collecting debris blown out during the debridement process; the high-precision infrared positioning system is arranged at the top of the spray gun body to monitor and locate the position of the high-speed nozzle in real time.

[0014] Preferably, the compressed air inlet, the Venturi tube, the multi-stage acceleration nozzle, and the high-speed nozzle are connected in sequence to form a complete airflow channel; the injection angle of the high-speed nozzle can be adjusted at will to inject the high-speed airflow into the pit.

[0015] Preferably, the self-spinning debris collection bin collects debris by using the cyclone separation principle to prevent secondary pollution of the environment by the debris.

[0016] Preferably, the high-precision infrared positioning system can adjust the direction of the high-speed nozzle in real time to ensure that the nozzle is accurately aligned with the position of the pit that needs to be debrided.

[0017] In the present invention, the vibratory compaction equipment is existing technology, such as: an intelligent parameter adjustment device and parameter adjustment method for a vibratory roller based on the law of jumping vibration (CN202310209123), an exciting force control system and control method for an intelligent directional vibratory roller (CN201710131341), a multi-domain analysis-based multi-intelligent compaction index grading and optimization method and system (CN202210968561), a drop hammer deflectometer overall calibration method and system based on laser vibration measurement (CN202210801831), etc., which can realize the functions of the vibratory compaction equipment in the present invention.

[0018] The self-spinning debris collection bin is an existing technology, such as: a cleaning device with automatic debris collection (CN212916656U), a debris cleaning and collection structure (CN220592439U), etc., which can realize the function of self-spinning debris collection.

[0019] The high-precision infrared positioning system is also an existing technology, such as: a visual positioning system based on highly reflective infrared marking (CN2023110415273), an indoor positioning method and system based on infrared (CN201811564420.7), both of which can realize the function of real-time adjustment of the direction of the high-speed nozzle.

[0020] Compared with the existing technology, the present invention achieves high cleanliness, active coupling and deep density of the pothole repair interface by constructing a three-stage repair system of "debridement-interface activation-bionic filling". The present invention establishes a gradient chemical barrier and molecular bonding at the interface, which can significantly improve the bonding strength and durability of the interface between new and old materials; the use of frequency-adjustable vibration compaction equipment greatly improves the compaction and uniformity of the repair material, reducing the hidden dangers of looseness and unevenness; at the same time, this process is convenient and fast to construct, and a single pothole can be repaired and opened to traffic within 45 minutes, which is more than double the construction efficiency of traditional methods. In addition, since the life of the repair layer is extended, the maintenance frequency and cost of the entire life cycle can be reduced. In summary, the present invention effectively solves the technical problem of easy debonding and failure of the pothole repair layer in a chloride salt environment, and has significant technological advancement.

[0021] The main principles and key effects of the present invention are as follows: A. Principle of the Debridement Phase: The powerful airflow generated by the high-pressure cyclone thoroughly debrides the potholes. The high-speed airflow, acting through the Venturi tube, creates a localized negative pressure, selectively absorbing small, loose debris without damaging surrounding intact materials, achieving complete removal of residues (residue rate <0.3%). Simultaneously, the abrasive action of the high-speed airflow creates a microscopic roughness structure (Ra ≈ 1.5 μm) on the pothole surface. This multi-scale rough interface provides more mechanical bonding sites for subsequent bonding, effectively "etching" a large number of microgrooves into the old pavement, improving interfacial adhesion at both macro and micro levels.

[0022] B. Principle of the interfacial activation stage: By introducing a nano-silane coupling agent at the interface, one end of the silane coupling agent molecule contains an active functional group (such as amino-NH2), which can undergo a condensation reaction with the polar groups (carboxyl, hydroxyl, etc.) in the asphalt binder; the other end contains a silane group, which forms a strong covalent Si-O-Si bond with the mineral base (silicon oxide or hydration product on the aggregate surface) under the alcohol condensation reaction. This double bonding mechanism builds a molecular bridge at the interface between the new and old materials, achieving chemical coupling. At the same time, the quaternary ammonium salt cationic group introduced in the silane coupling agent molecule can chelate free Cl - , "locking" the chloride ions in the interface coating, preventing them from penetrating further downward. The interface activation stage of the present invention establishes a dual structure of an organic-inorganic hybrid layer and an ion barrier layer at the pit interface, improving the interface durability from both chemical bonding and dielectric barrier aspects.

[0023] C. Principle of the Bionic Filling Stage: Layered filling and dynamic vibration compaction of the mixture ensures reliable, layer-by-layer bonding of the filling material to the base. The rubber-modified asphalt mixture used in this invention exhibits unique viscoelastic behavior, with its loss factor, tanδ, reflecting the ratio of energy dissipated within the material to its elastic energy storage. When the vibration frequency matches the material's internal characteristic frequency, the mixture enters a resonant state that favors particle rearrangement, facilitating rapid and compaction of the aggregate skeleton. This invention utilizes frequency-adjustable vibratory compaction equipment, employing low-frequency, high-amplitude, medium-frequency, medium-amplitude, and high-frequency, low-amplitude vibration modes for the initial, secondary, and final compaction stages. This allows coarse, medium, and fine aggregates to achieve optimal densities in sequence (see the Implementation Method section for details). This step-by-step vibration compaction not only improves compaction efficiency but also avoids aggregate segregation that can occur with a single high-frequency vibration, resulting in a dense and uniform internal repair layer. Furthermore, the rubber-modified asphalt imparts excellent fatigue and crack resistance to the mixture, which, combined with high compaction, effectively withstands the repetitive stresses of vehicle loads. The bionic filling stage of the present invention ensures sufficient anchoring and high density of the repair material to the base layer through layered vibration compaction, minimizes residual voids and stress concentration, and thus significantly improves the overall structural strength and long-term performance of the repair layer.

[0024] Through the synergistic effect of these three principles, this invention achieves systematic improvements in pothole repair, from the interface to the entire process: debridement improves the physical bonding conditions at the interface, interface activation establishes chemical bonding and a protective barrier, and biomimetic filling ensures a dense and stable internal structure. This innovative process significantly overcomes the drawbacks of traditional methods and creates a new mechanism for pothole repair.

[0025] The present invention has achieved remarkable technical effects through laboratory and actual road tests.

[0026] (1) Significantly improved interfacial bonding performance: According to laboratory testing and in accordance with the JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering," the direct pull-out strength of the repair interface of the present invention reached 2.5 to 3.2 MPa. Under conditions of 120 hours of erosion by 3% and 6% sodium chloride and magnesium chloride solutions, the interfacial bonding strength of the repair layer reached 1.8 MPa and 1.6 MPa, respectively, which were 68.7% and 80.1% higher than those of conventional repair processes. The above results indicate that the present invention significantly enhances the bonding strength of new and old materials through interfacial activation, especially maintaining stable interfacial strength in chloride salt corrosion environments, making it less susceptible to peeling damage.

[0027] (2) Significantly improved resistance to chloride ion corrosion and durability: The present invention endows the repair layer with excellent resistance to environmental corrosion by constructing a gradient chemical barrier layer and a molecular bonding interface. Laboratory accelerated corrosion tests show that under simulated salt spray corrosion conditions, the amount of chloride ion penetration in the interface area of the repair layer is significantly reduced compared with traditional processes, effectively blocking the migration path of the corrosive medium to the substrate and significantly delaying the interface degradation process. Based on the verification results of the standard multi-axial loading fatigue test (ASTM D7460), the fatigue resistance of the repair layer of the present invention under cyclic load is significantly better than that of conventional hot-patch materials, its fatigue life is significantly improved, and the failure mode is transformed from interface peeling to internal fracture of the material, indicating that the interface bonding strength and the overall structural durability are synergistically enhanced. Long-term service performance prediction analysis further shows that the expected life of the repair layer under complex environmental coupling is doubled compared with traditional processes, which can greatly reduce the frequency of repeated repairs and reduce the maintenance cost throughout the life cycle.

[0028] (3) Outstanding construction efficiency and economic advantages: The present invention adopts the integrated innovation of modular debridement device, rapid consolidation interface activation technology and intelligent dynamic compaction process to achieve a comprehensive improvement in the efficiency of repair operations. Actual engineering applications have shown that the time taken for the entire process from debridement to opening to traffic is significantly shorter than that of traditional processes, minimizing the interference of construction on road traffic. Economic analysis shows that this process significantly extends the effective service life of the repair layer and reduces the frequency of maintenance by improving interface durability and optimizing compaction quality; at the same time, the application of modular equipment and rapid curing materials reduces labor and energy costs. The results of the full life cycle cost model calculation show that this process has significant comprehensive economic advantages in the material, construction and maintenance stages, and is particularly suitable for the rapid repair needs of high traffic load sections and harsh environmental areas, and has wide engineering applicability and promotion value.

[0029] In summary, the present invention achieves a comprehensive improvement in the interface strength, durability and construction efficiency of pit repair by innovatively constructing a three-stage repair system of "debridement-interface activation-bionic filling", which can significantly extend the service life of the repair layer and reduce maintenance costs, and has good social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the process operation of the debridement stage in the present invention; Figure 2 Schematic diagram of the process operation of the interface activation stage in the present invention; Figure 3 Schematic diagram of the process operation of the bionic filling stage in the present invention; Figure 4 The hydrolysis reaction and hydrolysis mechanism of the silane coupling agent in the present invention; Figure 5 The reaction mechanism of the present invention is the condensation of silanols to form a Si-O-Si three-dimensional network skeleton; Figure 6 is the reaction mechanism of the bonding of silane to substrate (aggregate / asphalt surface) in the present invention; Figure 7 It is the condensation reaction of amino group (-NH2) and asphalt carboxylic acid group (-COOH) in the present invention; Figure 8 is a graph of aggregate gradation in the present invention; Figure 9 Schematic diagram of the structure of the high-pressure cyclone debridement device of the present invention; exist Figure 9 In the figure, 1--spray gun body, 2--Venturi tube, 3--compressed air inlet, 4--spray gun handle, 5--power cord, 6--high-precision infrared positioning system, 7--high-speed nozzle, 8--multi-stage acceleration nozzle, 9--spinning debris collection chamber. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, embodiments, specific application examples, and comparative examples. It should be noted that, in the absence of conflict, the various technical features or steps of the present invention can be arbitrarily combined to form more embodiments, and those skilled in the art should understand that these variations fall within the scope of protection of the present invention. Example

[0032] A composite process for repairing potholes on rubber-modified asphalt pavements that resist chloride and salt corrosion includes the following three steps: A. Debridement stage: Use a high-pressure cyclone debridement device to clean the pit, use high-speed airflow to flush out loose debris, and roughen the bottom and edges of the pit to form a clean and rough repair interface; B. Interface activation stage: Spray an interface adhesive containing a nano-silane coupling agent on the cleaned pothole interface, allowing it to penetrate into the original road surface material to a depth of 3 to 5 mm, and chemically react with the matrix material to form an organic-inorganic hybrid membrane with Si-O-Si covalent bonds and quaternary ammonium salt cationic groups, thereby constructing a chloride ion migration barrier. C. Bionic filling stage: Fill in rubber-modified asphalt mixture in layers and use frequency-adjustable vibration compaction equipment to compact it stage by stage. Through low-frequency, medium-frequency and high-frequency graded vibration, each level of aggregate is fully densely interlocked to form a repair layer that is firmly bonded to the original road surface and highly dense.

[0033] The high-pressure cyclone debridement device uses compressed air to generate an airflow of 0.8 to 1.2 MPa through a Venturi accelerator tube, which is ejected at high speed from a nozzle with a diameter of Φ6 to 8 mm and a spray angle of 60 to 75° to clean the pits. The local negative pressure generated by the Venturi tube adsorbs debris, so that the residual debris removal rate at the pit interface is ≥98%, and the surface roughness is Ra = 1.2 to 1.8 μm.

[0034] The nano-silane coupling agent is γ-aminopropyltriethoxysilane with a mass concentration of 2% to 5%, and contains 0.5% to 1.5% of a quaternary ammonium salt modifier. The interface adhesive containing the nano-silane coupling agent adopts a two-component on-site mixing and spraying process. Component A is a pre-prepared silane coupling agent solution, and component B is an organic acid catalyst solution with a pH of 4.5. During use, components A and B are mixed at a nozzle and evenly sprayed on the pit surface at a spraying rate of 300 to 400 g / m², forming a thin and uniform activation coating. Driven by capillary action, the activation coating penetrates downward to form a gradient transition zone with a penetration depth of 3 to 5 mm. After the penetrating silane molecules undergo a hydrolysis and condensation reaction with the substrate, a two-stage curing process is adopted to form a dense silicon-oxygen network film on the pit interface.

[0035] Rubber modified asphalt mixture includes the following components: (1) Base asphalt: 70# asphalt, needle penetration 60-80 (0.1mm); (2) Waste tire rubber powder: 40 mesh fineness, the dosage is 18-22% of the base asphalt weight; (3) Composite stabilizer: silane coupling agent, the dosage is 0.3-1.0% of the weight of the base asphalt; Aggregate gradation adopts discontinuous gradation S-shaped curve, and the void ratio is controlled at 2-4%.

[0036] The preparation process of rubber modified asphalt mixture includes the following steps: (1) Matrix asphalt pretreatment: Heat 70# matrix asphalt to a molten state of 160-170℃ and keep the temperature constant for standby use; (2) Rubber powder pretreatment: Place the 40-mesh waste tire rubber powder in an oven at 105±5℃ and dry it for 2 to 3 hours to remove surface moisture; (3) Gradient miscibility: Add pretreated rubber powder to the molten asphalt at a stirring rate of 800-1200 r / min in three batches, with an interval of 5-8 minutes between each batch, and control the total mixing amount to 18-22% of the asphalt mass; (4) High-speed shear modification: transfer the mixture to a shear emulsifier and shear at a rate of 4000-5000 r / min for 45-60 minutes at 180-185°C; (5) Swelling development: After shearing, transfer to the development tank and develop at a low speed of 170-175°C and 200-300 r / min for 2-3 hours; (6) Stabilization treatment: Add silane coupling agent at a concentration of 0.3-1.0% by mass of asphalt as a stabilizer, and continue stirring for 20-30 minutes until the system is homogenized and ready for use.

[0037] In graded vibration, the frequency and amplitude of vibration compaction are: 30-35Hz, 2-3mm in the low-frequency stage; 40-45Hz, 1-1.5mm in the medium-frequency stage; 50-55Hz, 0.5-0.8mm in the high-frequency stage. The temperature and modulus of the mixture are monitored in real time during the compaction process, and the vibration parameters are adjusted through closed-loop control.

[0038] The two-stage curing process, the first stage: natural curing at room temperature for 20 minutes, so that the silane is gradually hydrolyzed and initially polymerized to build a -Si-O-Si- three-dimensional network skeleton; the second stage, the interface layer is assisted by hot air at about 60 ° C for 10 minutes to promote the condensation bonding reaction between functional groups such as -NH2 in the silane molecules and asphaltene. Example

[0039] A high-pressure cyclone debridement device is used in a composite process for repairing potholes on rubber-modified asphalt pavements that resist chloride erosion. The device comprises a spray gun body 1, a venturi tube 2, a high-precision infrared positioning system 6, a high-speed nozzle 7, a multi-stage acceleration nozzle 8, and a self-spinning debris collection bin 9. A compressed air inlet 3 is provided at the rear end of the spray gun body 1, and the compressed air inlet 3 is connected to an external compressed air source via a hose. The venturi tube 2 is provided inside the spray gun body 1, and its throat has an aspect ratio of 8:1, and is used to accelerate compressed air to form a high-speed, high-pressure airflow. The multi-stage acceleration nozzle 8 is connected to the venturi tube 2 and has a conical, step-by-step contraction structure for further increasing the airflow velocity. The high-speed nozzle 7 is connected to the end of the multi-stage acceleration nozzle 8. The self-spinning debris collection bin 9 is provided on the lower side of the spray gun body 1 for collecting debris blown out during the debridement process. The high-precision infrared positioning system 6 is provided on the top of the spray gun body 1 for real-time monitoring and positioning of the position of the high-speed nozzle 7.

[0040] The compressed air inlet 3, Venturi tube 2, multi-stage acceleration nozzle 8, and high-speed nozzle 7 are sequentially connected to form a complete airflow channel. The spray angle of the high-speed nozzle 7 can be adjusted to spray the high-speed airflow into the pit. The self-spinning debris collection chamber 9 collects debris through the cyclonic separation principle, preventing secondary contamination of the environment. The high-precision infrared positioning system 6 can adjust the direction of the high-speed nozzle 7 in real time to ensure that the nozzle is precisely aligned with the pit location requiring debridement. Example

[0041] A composite process for repairing potholes on rubber-modified asphalt pavements that resist chloride and salt corrosion includes the following three stages: (1) High-pressure cyclone debridement stage: Use high-pressure cyclone debridement device to clean the pit (see Figure 1 ), using compressed air through a Venturi accelerator to generate an airflow of up to 0.8-1.2 MPa, which is ejected at high speed from a nozzle (diameter Φ6-8 mm, spray angle 60°-75°). The high-speed airflow creates a strong cyclonic effect and localized negative pressure within the pit, rapidly blowing out loose debris, dust, and accumulated water. After debridement, the residual debris removal rate at the pit interface is ≥98%, and the surface roughness Ra is improved from less than 0.5 μm to 1.2-1.8 μm. This rough surface provides ideal conditions for the subsequent adhesion of the interface adhesive. (II) Nanosilane interface activation stage: After the debridement is completed, a nanosilane-based interface activation adhesive is immediately sprayed on the pit interface (see Figure 2), the nano-silane-based interface activated binder forms a chemical bond through a chemical reaction between its main component γ-aminopropyltriethoxysilane (APTES) and the hydroxyl groups on the aggregate surface, thereby enhancing the interfacial bonding between asphalt and aggregate. At the same time, its good dispersibility and compatibility enable it to fill the tiny pores on the interface, reduce porosity, and reduce the chloride ion penetration channel; in addition, it can also improve the asphalt microstructure, making it denser and more uniform, reducing the chloride ion diffusion path and adsorption sites, and improving the surface energy and wettability of asphalt, so that the asphalt film can cover the aggregate surface more evenly, effectively preventing chloride ion invasion; the nano-silane binder also forms a protective film on the aggregate surface that is hydrophobic and resistant to chloride ion penetration, preventing chloride ions from contacting the aggregate, and reacting with the asphalt components to generate It forms a stable chemical structure, reduces the chemical degradation of asphalt under the action of chloride ions, thereby significantly improving the chloride ion corrosion resistance of the asphalt / aggregate interface and extending the service life of the road. The binder adopts a two-component on-site mixing and spraying process. Component A is a pre-formulated silane coupling agent solution, and component B is an organic acid catalyst solution with a pH of ≈4.5. The two components are mixed at the nozzle using special spraying equipment and evenly sprayed on the pothole surface. The spraying amount is about 300-400g / ㎡, which can form a thin and uniform activation coating on the pothole interface. Driven by capillary action, the coating penetrates downward to form a gradient transition zone with a penetration depth of about 3-5mm. After the penetrating silane molecules undergo hydrolysis and condensation reaction with the substrate, they solidify at the interface to form a dense silicon-oxygen network membrane. A two-stage curing process is employed: In the first stage, natural curing takes place at room temperature (approximately 25°C) for 20 minutes, allowing the silane to gradually hydrolyze and initially polymerize, building a three-dimensional Si-O-Si network. In the second stage, hot air at approximately 60°C is used to assist in curing the interface layer for 10 minutes, promoting condensation and bonding between functional groups such as -NH2 in the silane molecules and the asphaltene. This gradient curing process ensures a fully integrated interface layer, resulting in a hybrid bonding layer with excellent mechanical and durability properties, ultimately forming an active interface layer. Silane coupling firmly bonds the new and old materials, while its dense structure blocks harmful media such as chloride ions from the interface, providing long-term protection for the repair layer.

[0042] The physical and chemical reactions involved in the nanosilane interface activation process are as follows: ① Hydrolysis reaction of silane coupling agent (APTES): NH2 (CH2)3Si(OC2H5)3+3H2O→NH2(CH2)3Si(OH)3+3C2H5OH ②Silanol condensation forms Si-O-Si network: 2 NH2(CH2)3Si(OH)3→NH2(CH2)3Si(OH)2-O-Si(OH)2(CH2)3NH2+H2O Further dehydration forms a dense structure: Si-OH+Si-OH→Si-O-Si+H2O ③ Bonding of silane to substrate (aggregate / asphalt surface): NH2(CH2)3Si(OH)3+substrate-OH→substrate-O-Si(OH)2(CH2)3NH2+H2O ④ Condensation reaction of amino group (-NH2) and asphalt carboxylic acid group (-COOH): NH2(CH2)3Si-O-+asphalt-COOH→asphalt-CONH-(CH2)3Si-O-+H2O] ⑤ Physical filling effect of nano-SiO2 particles Nano-SiO2 (particle size 30-50nm) acts as an inert carrier to enhance the density of the interface layer by physically filling microcracks: a composite structure of SiO2 (nanoparticles) + microcracks → filled cracks.

[0043] (III) Bionic filling and compaction stage: After the interface activation treatment is completed and slightly dried, the filling and compaction of the rubber modified asphalt mixture can be carried out (see Figure 3 The rubber modified asphalt mixture selected by the present invention adopts an optimized material design: the asphalt uses 70# base asphalt (the basic indicators are shown in Table 1), the amount of 40 mesh rubber powder is 18% to 22%, and the various performance indicators of the rubber modified asphalt are measured based on the various indicators of the base asphalt mixture as shown in Table 2; the aggregate gradation adopts discontinuous gradation (S-shaped curve, as shown in Table 2). Figure 8 as shown), to provide a good skeleton embedded structure and asphalt membrane wrapping.

[0044] The preparation process of the rubber modified asphalt mixture of the present invention comprises the following steps: (1) Matrix asphalt pretreatment: Heat 70# matrix asphalt to a molten state of 160-170℃ and keep the temperature constant for standby use; (2) Rubber powder pretreatment: Place the 40-mesh waste tire rubber powder in an oven at 105±5℃ and dry it for 2 to 3 hours to remove surface moisture; (3) Gradient miscibility: Add pretreated rubber powder to the molten asphalt at a stirring rate of 800-1200 r / min in three batches, with an interval of 5-8 minutes between each batch, and control the total mixing amount to 18-22% of the asphalt mass; (4) High-speed shear modification: transfer the mixture to a shear emulsifier and shear at a rate of 4000-5000 r / min for 45-60 minutes at 180-185°C; (5) Swelling development: After shearing, transfer to the development tank and develop at a low speed of 170-175°C and 200-300 r / min for 2-3 hours; (6) Stabilization treatment: Add silane coupling agent at a concentration of 0.3-1.0% by mass of asphalt as a stabilizer, and continue stirring for 20-30 minutes until the system is homogenized and ready for use.

[0045] During filling, the mixture is laid in two to three layers, each no thicker than 5 cm, depending on the depth of the pit to facilitate compaction. Frequency-adjustable vibratory compaction equipment is used in stages: ① Initial compaction: Compaction is performed using low-frequency vibration at approximately 30 Hz, with the excitation energy controlled at 120 to 150 kN·m. The primary goal is to sink and lock the coarse aggregate, eliminating large voids. ② Re-compaction: Continued compaction is performed using medium-frequency vibration at approximately 40 Hz, increasing the contact stress of the rollers on the mixture to 0.4 to 0.6 MPa, further compacting the medium-sized aggregate and approaching the theoretical maximum density. ③ Final compaction: The surface layer is compacted using high-frequency vibration at approximately 50 Hz, with a reduced amplitude to refine the surface, eliminating any structural depth exceeding 5 mm, ultimately achieving a smooth, dense surface structure. Throughout the compaction process, vibration parameters can be adjusted in real time based on changes in mixture temperature and density. The vibratory compaction equipment of the present invention integrates an intelligent control module, including: a compaction closed-loop control unit based on the inverse modulus of the drop weight deflection (FWD), which is used to evaluate the compaction effect in real time and decide whether to increase the number of compaction passes; an infrared monitoring device for the mixture temperature field (sampling frequency 10Hz), which is used to ensure that the vibration compaction is carried out within an appropriate temperature range to avoid loosening of the material due to over-cooling compaction; and a vibration frequency adaptive adjustment algorithm control module, which can automatically optimize the vibration frequency according to the mixture stiffness changes fed back by the sensor.

[0046] Table 1 Performance test results of matrix asphalt

[0047] Table 2 Performance tests of rubber modified asphalt mixture

[0048] The vibratory compaction equipment in the present invention can intelligently adapt to the changes in the mechanical state of the mixture during the compaction process, avoiding under-compaction or over-compaction, so that the compaction degree of the repair layer of the present invention can reach more than 98%, which is greatly improved compared with traditional processes, and the density of each internal layer is uniform and consistent, without significant differences.

[0049] To further illustrate the beneficial effects of the present invention, three specific application examples and corresponding comparative examples are provided below. All examples were tested under similar conditions. The comparative examples do not employ all the key technical features of the present invention, but are used to compare and evaluate the performance improvement of the present invention.

[0050] Application Example 1: Project Background: A typical pothole (approximately 1.2m long, 1.0m wide, and 0.08m deep) on the asphalt pavement of a toll plaza on a coastal highway was selected for on-site repair testing. Due to long-term exposure to sea salt and vehicle braking, the pothole's perimeter was severely aged and the interface was heavily contaminated.

[0051] Repair process: The process of the present invention was used to repair the pothole. First, a high-pressure cyclone debridement device was used to thoroughly clean the pothole: the air pressure was set to 1.0 MPa, the spray angle was about 70°, and the pothole was cleaned slowly at a distance of 10 cm from the surface. All loose asphalt fragments and dust were flushed out within about 20 seconds. After debridement, the base was solid and slightly rough. Subsequently, a two-component spraying device was used to evenly spray the nano-silane interface agent on the bottom and surrounding walls of the pothole. The actual amount used was about 350 g / ㎡. The interface agent penetrated and moistened the base. After standing for about 5 minutes, the surface became sticky and slightly glossy. Next, a rubber-modified asphalt mixture heated to 160°C (rubber powder content 20%, target density 2.35 g / cm³) was filled in two layers, each layer about 4 cm thick. Compaction was performed using a small, frequency-adjustable vibratory roller: the first layer was rolled four times with a low-frequency 30Hz vibrator. The second layer, after filling, was first rolled six times with a medium-frequency 40Hz vibrator. Finally, a high-frequency 50Hz roller was applied twice to eliminate surface marks. The entire construction process, from initial cleaning to completion of compaction, took 40 minutes. After 15 minutes, the patch cooled to below 50°C and was ready for traffic.

[0052] Performance Testing: 28 days after the repair was completed, the repaired area was sampled and tested on-site. The interfacial bond strength, tested using the pull-out method, was 2.05 MPa, significantly higher than the interfacial strength between the surrounding original pavement structure layers (approximately 1.2 MPa). A splitting test was used to determine the low-temperature crack resistance of the repaired material. The splitting strength reached 4.8 MPa at -10°C, with the fracture occurring within the new material, with no separation observed at the interface. The repaired specimens were immersed in a saline (3% NaCl) solution for 30 days, and the chloride ion diffusion depth was measured to be only 2.1 mm. In contrast, the chloride ion penetration depth of the control specimen (not using an interfacial agent) exceeded 6 mm.

[0053] Test results show that the patch layer of the present invention adheres firmly to the original road surface and has good water resistance and salt erosion resistance. On-site observations show that the patched potholes remained intact after a winter of freeze-thaw cycles, with no edge peeling or cracking.

[0054] Application Example 2: Project Background: A winter pothole repair test was conducted on a main road in a northern Chinese city. The pothole measured approximately 0.5m x 0.5m and was 0.06m deep. During the repair operation, the ambient temperature was -5°C, and the road surface temperature was approximately -3°C, representing extremely cold conditions.

[0055] Repair process: Repair construction was carried out in accordance with the process of the present invention. Due to the low temperature, windbreak measures were first taken around the pit and the pit surface was quickly preheated to about 0°C using a blowtorch. Immediately afterwards, a high-pressure cyclone debridement device was used to clean debris and ice crystals (the air pressure was set at 1.2 MPa to enhance the removal of frozen impurities). During the interface treatment stage, a fast-curing nano-silane interface agent was selected (the amount of catalyst was increased so that it could react faster at low temperatures). After spraying, the curing time was extended to 30 minutes to ensure sufficient reaction. The filling material used was the cold-patch rubber-modified asphalt mixture designed by the present invention (which can maintain an appropriate construction consistency at room temperature), with an 18% rubber powder content, and a certain proportion of early-strength cement added to the aggregate to promote low-temperature hardening. After filling the pit in two batches, a small vibrating compactor with an insulating canvas cover was used for compaction. Taking into account the increased viscosity of the material at low temperatures, the compaction strategy was adjusted to: first, using a high-excitation 35Hz vibration tamping method to achieve initial compaction of the mixture; then, reducing the frequency to 25Hz for multiple rolling passes to further compact the aggregate using a larger amplitude; and finally, performing surface finishing with 45Hz vibration. The entire repair process took approximately 55 minutes, slightly longer than normal temperature application time, but still significantly faster than traditional hot patching, which requires heating equipment.

[0056] Performance testing: Seven days after the repair was completed, core samples were drilled on-site to test mechanical properties. A splitting strength test was conducted at -5°C, and the results showed that the splitting strength of the repair material was 3.6MPa, a 50% increase compared to traditional cold-patch materials (2.4MPa). After the core sample was subjected to 10 freeze-thaw cycles between -20°C and +20°C, its interfacial bonding strength retention rate was measured to be 88%, significantly higher than the control group without an interface agent (58%). After salt water was poured onto the repaired area and observed over a winter, no peeling occurred at the edges of the repair layer, and no loosening or subsidence occurred within the layer. This test demonstrated the applicability and reliability of the process in low-temperature environments: even in extremely cold conditions, the interface is secure and the material's performance is maintained, allowing for rapid restoration of road use.

[0057] Application Example 3: Project Background: During a municipal road maintenance project, the process described in this invention was implemented to reinforce three potholes that had been repeatedly repaired and failed. Located near a bus lane and a speed bump before a traffic light, the three potholes were subjected to repeated heavy loads and long-term corrosion from snowmelt. Previously, they had been filled twice with traditional hot filler, but both times, the filler reappeared within a year.

[0058] Repair Process: For the aforementioned difficult road sections, the process of the present invention was employed for enhanced repair. The construction steps were similar to those in Example 1, with some enhancements in materials and processes: (a) During the debridement phase, infrared-assisted positioning was added to the standard device for more thorough cleaning; (b) the silane coupling agent content in the interface agent formulation was increased to 20%, and 2% by weight of epoxy resin was incorporated as a secondary binder to further enhance interfacial strength; (c) the rubber powder content in the filling mixture was capped at 22%, and an additional 0.3% of glass fiber was incorporated to improve the crack resistance of the patch. During the compaction phase, the intelligent compaction system of the present invention was employed, with on-site real-time monitoring of the compaction modulus. Compaction was stopped when the surface equivalent modulus, as estimated by FWD testing, reached 3,000 MPa to avoid excessive damage to the skeleton. Traffic was reopened one hour after completion.

[0059] Performance test: Follow-up inspections were conducted on the repaired potholes at 3 months, 6 months and 12 months respectively. Core sampling at 3 months showed that the Marshall stability of the repair layer was 14.8kN and the splitting strength was 2.1MPa, both significantly higher than traditional hot-patch materials (stability of about 10kN and splitting strength of 1.3MPa). At 6 months, an on-site transverse shear test was carried out under the high temperature of midsummer. The repair layer did not suffer shear damage and the shear strength reached 1.5MPa, while the traditional repair material had shown slight displacement under the same conditions. After 12 months, after a winter and a summer, core drilling was carried out again, and it was found that there was no obvious peeling between the repair layer and the original road surface, and the interface shear strength was still 1.2MPa, more than double the level before the first maintenance. Comprehensive comparison shows that the three potholes repaired by the process of the present invention remained intact and stable during the one-year trial period, in sharp contrast to the newly-developed potholes in the adjacent untreated areas, reflecting the excellent long-term performance of the process of the present invention.

[0060] Comparative Example 1: A comparative test was conducted on the pothole described in Example 1 using a traditional hot-mix asphalt patching process. Specifically, a jackhammer was used to cut and clean the four sides of the pothole vertically. After manually removing large pieces of debris, the bottom of the pothole was simply baked with a flame spray gun for approximately one minute, without the use of a specialized interface agent. A layer of hot asphalt binder was then applied while still hot, acting as a tack coat. A standard hot-mix asphalt mixture (AC-13) was then filled in and repeatedly compacted with a tamper and a small steel-wheel roller until the surface was essentially flat. The application took approximately 1.5 hours. After 28 days of curing, the traditional patch was subjected to the same testing. The results showed an interfacial tensile strength of 0.75 MPa, approximately 40% lower than that of Example 1 (2.05 MPa). After water immersion and freeze-thaw cycles, significant delamination damage was observed at the interface, with the strength retention rate dropping below 60%. Fine cracks were observed at the interface between the patch and the existing pavement, presumably due to insufficient interfacial adhesion. This comparison shows that the traditional hot patching process has poor interface bonding strength and is significantly less durable than the process of the present invention due to incomplete interface cleaning and aging caused by heating.

[0061] Comparative Example 2: In Example 2, a conventional cold-patch asphalt material was used for repairs of potholes exposed to low temperatures. A commercially available bagged cold-patch material was used, and its interface treatment consisted solely of brushing an epoxy primer on the inner surface of the pothole. The cold-patch mix was then directly filled in and compacted using a tamper and manual pressure. Due to the low temperatures, the epoxy primer was not fully cured and was subsequently covered by the pothole surface. After the repair was completed, the pothole was left to stand for two hours before being reopened to traffic. Similar low-temperature and freeze-thaw tests revealed that the cold-patch layer had an initial pull-out strength of only 0.6 MPa, and after three months in a -10°C environment, it completely lost its bond, becoming loose when struck with a hammer. Analysis suggests that conventional cold-patch materials struggle to form an effective bond with the existing pavement at low temperatures. This is due to the sluggish reaction of epoxy binders at low temperatures and their limited effectiveness on wet interfaces. Furthermore, the cold-patch mix itself is affected by temperature, resulting in insufficient compaction and low strength. In contrast, Example 2, through silane coupling interface activation and staged vibration compaction, successfully achieved a stable interface bond and material density at low temperatures, demonstrating significant advantages.

[0062] Comparative Example 3: To verify the differential impact of interfacial waterproofing materials, a comparative indoor test similar to Example 1 was conducted. In one set of specimens, a conventional silicate waterproofing agent (a commercially available sodium silicate solution diluted 1:1 with water) was sprayed onto the cleaned pit interface. After 5 minutes of penetration, the same rubber-modified asphalt mixture as in Example 1 was filled and compacted. A control set was treated with the nanosilane interfacial agent of the present invention and then filled and compacted. After 7 days of standard curing, both specimens were subjected to a chloride attack test: immersion in a 3% NaCl solution for 60 days, followed by microstructural analysis of the interface. The results revealed that the specimens treated with the silicate waterproofing agent formed a large number of white crystals near the interface. Further XRD analysis confirmed that these crystals were primarily composed of Friedel salts. These crystals aggregated at the interface and expanded, resulting in visible microcracks between the new and old materials. The interfacial bond strength of these specimens decreased by 52% compared to the pre-immersion condition. In contrast, the specimens treated with the silane interfacial agent of the present invention showed no interfacial salt precipitation, maintaining an intact interfacial structure and exhibiting only a 10% decrease in bond strength. The comparative test shows that traditional silicate interface sealing materials may undergo harmful reactions in a chloride environment, counterproductively exacerbating interface damage, while the silane coupling interface activation layer used in the present invention can withstand the test of chloride corrosion and continue to play an interface protection role.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. 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 present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all changes that come within the meaning and range of equivalents of the claims be included within the scope of protection of the present invention.

Claims

1. A composite process for repairing potholes on rubber-modified asphalt pavement that is resistant to chloride salt corrosion, characterized in that: It includes the following three steps: A. Debridement stage: Use a high-pressure cyclone debridement device to clean the pit, use high-speed airflow to flush out loose debris, and roughen the bottom and edges of the pit to form a clean and rough repair interface; B. Interface activation stage: Spray an interface adhesive containing a nano-silane coupling agent on the cleaned pothole interface, allowing it to penetrate into the original road surface material to a depth of 3 to 5 mm, and chemically react with the matrix material to form an organic-inorganic hybrid membrane with Si-O-Si covalent bonds and quaternary ammonium salt cationic groups, thereby constructing a chloride ion migration barrier. C. Bionic filling stage: Fill in rubber-modified asphalt mixture in layers and use frequency-adjustable vibration compaction equipment to compact it stage by stage. Through low-frequency, medium-frequency and high-frequency graded vibration, each level of aggregate is fully densely interlocked to form a repair layer that is firmly bonded to the original road surface and highly dense.

2. The chloride-resistant rubber-modified asphalt pavement pothole repair composite process according to claim 1 is characterized by: The high-pressure cyclone debridement device uses compressed air to generate an airflow of 0.8 to 1.2 MPa through a Venturi accelerator tube, which is ejected at high speed from a nozzle with a diameter of Φ6 to 8 mm and a spray angle of 60 to 75 degrees to clean the pits and grooves. The local negative pressure generated by the Venturi tube adsorbs debris, so that the residual debris removal rate at the pit and groove interface is ≥98%, and the surface roughness Ra is 1.2 to 1.8 μm.

3. The composite process for repairing potholes on a rubber-modified asphalt pavement resistant to chloride salt corrosion according to claim 1, characterized in that: The nano-silane coupling agent is γ-aminopropyltriethoxysilane, with a mass concentration of 2% to 5%, and contains 0.5% to 1.5% of a quaternary ammonium salt modifier. The interfacial adhesive containing the nano-silane coupling agent adopts a two-component on-site mixing and spraying process. Component A is a pre-prepared silane coupling agent solution, and component B is an organic acid catalyst solution with a pH of 4.

5. During use, components A and B are mixed at the nozzle and evenly sprayed on the pit surface at a spraying rate of 300 to 400 g / m², forming a thin and uniform activation coating. Driven by capillary action, the activation coating penetrates downward to form a gradient transition zone with a penetration depth of 3 to 5 mm. After the penetrating silane molecules undergo a hydrolysis and condensation reaction with the substrate, a two-stage curing process is adopted to form a dense silicon-oxygen network film at the pit interface.

4. The composite process for repairing potholes on a rubber-modified asphalt pavement resistant to chloride salt corrosion according to claim 1, characterized in that: The rubber modified asphalt mixture comprises the following components: (1) Base asphalt: 70# asphalt, needle penetration 60-80 (0.1mm); (2) Waste tire rubber powder: 40 mesh fineness, the dosage is 18-22% of the base asphalt weight; (3) Composite stabilizer: the dosage is 0.3-1.0% of the weight of the base asphalt; Aggregate gradation adopts discontinuous gradation S-shaped curve, and the void ratio is controlled at 2-4%.

5. The composite process for repairing potholes on a rubber-modified asphalt pavement resistant to chloride salt corrosion according to claim 4 is characterized in that: The preparation process of the rubber modified asphalt mixture comprises the following steps: (1) Matrix asphalt pretreatment: Heat 70# matrix asphalt to a molten state of 160-170℃ and keep the temperature constant for standby use; (2) Rubber powder pretreatment: Place the 40-mesh waste tire rubber powder in an oven at 105±5℃ and dry it for 2 to 3 hours to remove surface moisture; (3) Gradient miscibility: Add pretreated rubber powder to the molten asphalt at a stirring rate of 800-1200 r / min in three batches, with an interval of 5-8 minutes between each batch, and control the total mixing amount to 18-22% of the asphalt mass; (4) High-speed shear modification: transfer the mixture to a shear emulsifier and shear at a rate of 4000-5000 r / min for 45-60 minutes at 180-185°C; (5) Swelling development: After shearing, transfer to the development tank and develop at a low speed of 170-175°C and 200-300 r / min for 2-3 hours; (6) Stabilization treatment: Add silane coupling agent at a concentration of 0.3-1% by mass of asphalt as a stabilizer, and continue stirring for 20-30 minutes until the system is homogenized and ready for use.

6. The composite process for repairing potholes on a rubber-modified asphalt pavement resistant to chloride salt corrosion according to claim 1, characterized in that: In the graded vibration, the frequency and amplitude of the vibration compaction are: 30-35 Hz and 2-3 mm in the low-frequency stage; 40-45 Hz and 1-1.5 mm in the medium-frequency stage; 50-55 Hz and 0.5-0.8 mm in the high-frequency stage, and the temperature and modulus of the mixture are monitored in real time during the compaction process, and the vibration parameters are adjusted through closed-loop control.

7. The composite process for repairing potholes on a rubber-modified asphalt pavement resistant to chloride salt corrosion according to claim 3 is characterized by: The two-stage curing process includes: in the first stage, natural curing at room temperature for 20 minutes to allow the silane to gradually hydrolyze and initially polymerize to build a three-dimensional Si-O-Si network skeleton; in the second stage, hot air at about 60°C is used to assist in curing the interface layer for 10 minutes to promote condensation bonding reactions between functional groups such as -NH2 in the silane molecules and asphaltene.

8. The composite process for repairing potholes on a rubber-modified asphalt pavement resistant to chloride salt corrosion according to claim 1, characterized in that: The high-pressure cyclone debridement device comprises a spray gun body (1), a venturi tube (2), a high-precision infrared positioning system (6), a high-speed nozzle (7), a multi-stage acceleration nozzle (8) and a self-spinning debris collection bin (9); the rear end of the spray gun body (1) is provided with a compressed air inlet (3), which is connected to an external compressed air source through a hose; the venturi tube (2) is arranged inside the spray gun body (1), and the length-to-diameter ratio of its throat is 8:1, and is used to accelerate the compressed air to form a high-speed and high-pressure airflow; the multi-stage acceleration nozzle (8) is connected to the venturi tube (2), and has a conical step-by-step contraction structure for further increasing the airflow speed; the high-speed nozzle (7) is connected to the end of the multi-stage acceleration nozzle (8); the self-spinning debris collection bin (9) is arranged at the lower side of the spray gun body (1) and is used to collect debris blown out during the debridement process; the high-precision infrared positioning system (6) is arranged at the top of the spray gun body (1) to monitor and locate the position of the high-speed nozzle (7) in real time.

9. The composite process for repairing potholes on a rubber-modified asphalt pavement resistant to chloride salt corrosion according to claim 8, characterized in that: The compressed air inlet (3), the Venturi tube (2), the multi-stage acceleration nozzle (8), and the high-speed nozzle (7) are connected in sequence to form a complete airflow channel; the injection angle of the high-speed nozzle (7) can be adjusted at will, and is used to inject the high-speed airflow into the interior of the pit.

10. The composite process for repairing potholes on a rubber-modified asphalt pavement resistant to chloride salt corrosion according to claim 8, characterized in that: The self-rotating debris collection chamber (9) collects debris through the cyclone separation principle to prevent secondary pollution of the environment by the debris; the high-precision infrared positioning system (6) can adjust the direction of the high-speed nozzle (7) in real time to ensure that the nozzle is accurately aligned with the pit position that needs to be debrided.

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