A rubber modified asphalt pavement pothole repair composite process resistant to chloride salt attack

Abstract

The application discloses a kind of anti-chlorine salt erosion rubber modified asphalt pavement pit slot repair composite process, in view of the interface peeling caused by chlorine salt erosion in traditional repair process, short repair life problem, innovatively proposes the three-stage repair system of "debridement-interface activation-bionic filling": (1) rough interface is formed by using high-pressure cyclone debridement device to remove loose debris;(2) spray anti-chloride bonding layer containing nano-silane coupling agent, the depth of penetration reaches 3-5mm, forms chemical barrier;(3) layered filling rubber modified asphalt mixture, the gradient compaction is implemented in 30-50Hz of adjustable frequency vibrating road roller.The application improves the interface strength by molecular bonding and mechanical interlocking dual action, realizes the dual anchoring of chemical bonding and mechanical engagement effect of repair layer and original pavement, improves the interface bonding strength, prolongs the service life of repair layer, effectively solves the technical problem that pit slot repair layer is easy to debond and fails in chlorine salt environment, and is suitable for the rapid repair of pavement diseases in coastal areas and road sections where deicing agent is used a lot in winter.

Description

Technical Field

[0001] This invention relates to a pothole repair process for rubber-modified asphalt mixtures based on interface activation theory, specifically a composite process for repairing potholes in rubber-modified asphalt pavements that resists chloride salt erosion, belonging to the field of road engineering maintenance technology. Background Technology

[0002] In the field of road maintenance engineering, the problem of secondary failure after pothole repair of asphalt pavement has long existed, which seriously restricts the repair effect of the pavement. Especially in areas where chloride salt de-icing agents are frequently used in winter, the repair layer is easily affected by the penetration of corrosive media, resulting in defects such as bonding failure and delamination, leading to premature deterioration of the repair structure. Interface bonding failure is the main failure mode, which is manifested as follows: (1) The debris and pollutants remaining at the repair interface form a weak bonding transition zone, which significantly weakens the synergistic bearing capacity of the new and old materials; (2) After chloride ions penetrate into the interface through the micro-cracks of the old pavement, they induce electrochemical corrosion reaction on the surface of the aggregate, accelerating the irreversible decay of the interface bonding performance; (3) The interlayer bonding strength continues to decline under the long-term effects of the environment and load, further aggravating the risk of separation between the repair layer and the substrate. The above problems not only cause 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, which urgently needs to be fundamentally broken through through technological innovation.

[0003] The current mainstream repair process has systemic 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 is prone to aging and embrittlement of old pavement asphalt materials, resulting in damage to the microstructure of the interface, and the shear strength of the repaired interface is significantly deteriorated, making it difficult to meet the requirements of long-term service; (2) Although cold-mix asphalt materials break through the environmental temperature limit, their interface binder has insufficient blocking effect on chloride ions and poor molecular compatibility with aged asphalt, which easily leads to the overall failure of the repair layer due to interface delamination; (3) Existing cleaning processes mostly rely on mechanical grooving, manual cleaning and other means, which have low efficiency in removing sub-millimeter-level debris and pollutants, and the residue forms local stress concentration points, which become potential causes of interface peeling. In addition, conventional compaction equipment uses fixed vibration parameters and cannot dynamically adjust the excitation mode according to the gradation and rheological characteristics of the mixture, resulting in asynchronous compaction of coarse and fine aggregates, forming a porosity gradient inside the repair layer, reducing the overall structure.

[0004] The existing technology system has not yet overcome three major obstacles: (1) the debridement process lacks a selective removal mechanism, making it difficult to completely remove loose debris while preserving the healthy matrix; (2) interface treatment remains at the level of physical roughening, 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 causes secondary segregation of aggregate. Especially in the chloride erosion environment, traditional silicate-based interface waterproofing agents will react with the invading Cl -A displacement reaction occurs, generating expansive Friedel salts (volume expansion rate 12-18%), which accelerates the interfacial debinding process. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the shortcomings of existing pothole repair technologies in terms of interface cleanliness, interface adhesion durability, and compaction quality. This invention provides a composite process for repairing potholes in rubber-modified asphalt pavements that resists chloride ion erosion. By constructing a three-stage repair system of "debris removal - interface activation - biomimetic filling," a gradient protective interface structure is established to block chloride ion erosion and migration. This achieves dual anchoring through chemical bonding and mechanical interlocking between the repair layer and the original pavement, improving interface adhesion strength. Furthermore, a dynamic compaction process adapted to the rheological properties of rubber-modified asphalt is developed, ensuring high density and uniformity of the repair mixture. This method is suitable for rapid repair of pavement defects in coastal areas and sections where de-icing agents are used extensively in winter.

[0006] The technical solution adopted by this invention to solve the technical problem is as follows: A composite process for repairing potholes in rubber-modified asphalt pavements resistant to chloride salt erosion includes the following three steps: A. Debridement stage: The pit is cleaned using a high-pressure cyclone debridement device. Loose debris is flushed out by high-speed airflow, and the bottom and edges of the pit are roughened to form a clean but rough repair interface. B. Interface activation stage: Spray an interface binder containing nano-silane coupling agent onto the cleaned pothole interface, allowing it to penetrate into the original pavement material to a depth of 3-5 mm, and react chemically with the matrix material to form an organic-inorganic hybrid film with Si-O-Si covalent bonds and quaternary ammonium salt cationic groups, thereby constructing a chloride ion migration barrier layer. C. Bionic filling stage: Rubber-modified asphalt mixture is filled in layers and compacted in stages using frequency-adjustable vibration compaction equipment. Through low-frequency, medium-frequency, and high-frequency graded vibration, the aggregates at each level are fully compacted and interlocked to form a repair layer that is firmly bonded to the original pavement 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, which is then sprayed 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, resulting in a debris removal rate of ≥98% at the pit interface and a surface roughness Ra of 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% quaternary ammonium salt modifier; the interface binder 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 pH=4.5. During use, components A and B are mixed at the nozzle and then sprayed evenly on the surface of the pit at a spraying speed of 300 to 400 g / m² to form a thin and uniform activated coating. This activated coating penetrates downward under the drive of capillary action to form a gradient transition zone with a penetration depth of 3 to 5 mm. After the penetrated silane molecules undergo 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, penetration 60-80 (0.1mm); (2) Waste tire rubber powder: 40 mesh fineness, the dosage is 18-22% of the weight of the base asphalt; (3) Composite stabilizer: The dosage is 0.3% to 1.0% of the weight of the base asphalt; The aggregate gradation adopts a 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 includes the following steps: (1) Pretreatment of base asphalt: Heat 70# base asphalt to 160-170℃ to a molten state and keep it at a constant temperature for later use; (2) Pretreatment of rubber powder: Place 40-mesh waste tire rubber powder in an oven at 105±5℃ and dry for 2-3 hours to remove surface moisture; (3) Gradient mixing: Under the condition of stirring speed of 800-1200 r / min, the pretreated rubber powder is added to the molten asphalt in three batches, with an interval of 5-8 minutes between each batch, and the total amount is controlled to be 18-22% of the asphalt mass; (4) High-speed shearing modification: Transfer the mixture to a shear emulsifier and shear it at 4000-5000 r / min for 45-60 minutes at 180-185℃; (5) Swelling and development: After shearing, transfer to a development tank and develop at low speed for 2-3 hours at 170-175℃ and 200-300r / min; (6) Stabilization treatment: Add 0.3-1% of the mass of asphalt as a silane coupling agent as a stabilizer, and continue stirring for 20-30 minutes until the system is homogenized before use.

[0011] Preferably, in the graded vibration, the vibration compaction frequency and amplitude are as follows: 30-35Hz and 2-3mm in the low-frequency stage; 40-45Hz and 1-1.5mm in the medium-frequency stage; and 50-55Hz and 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.

[0012] Preferably, the two-stage curing process includes the following stages: First stage: natural curing at room temperature for 20 minutes to allow silane to gradually hydrolyze and initially polymerize to build a -Si-O-Si- three-dimensional network framework; Second stage: using hot air at about 60°C to assist in curing the interface layer for 10 minutes to promote the condensation and bonding reaction between functional groups such as -NH2 in 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 accelerating nozzle, and a spinning debris collection chamber. The spray gun body has a compressed air inlet at its tail, which is connected to an external compressed air source via a hose. The venturi tube is located inside the spray gun body, with a length-to-diameter ratio of 8:1 at its throat, used to accelerate compressed air into a high-speed, high-pressure airflow. The multi-stage accelerating nozzle is connected to the venturi tube and has a tapered, progressively contracting structure to further increase the airflow velocity. The high-speed nozzle is connected to the end of the multi-stage accelerating nozzle. The spinning debris collection chamber is located on the lower side of the spray gun body to collect debris blown out during the debridement process. The high-precision infrared positioning system is located on 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, venturi tube, multi-stage accelerating nozzle, and high-speed nozzle are connected in sequence to form a complete airflow channel; the spray angle of the high-speed nozzle can be adjusted at will to spray high-speed airflow into the pit.

[0015] Preferably, the spin-type debris collection bin collects debris 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 pit or groove that needs to be cleaned.

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

[0018] The aforementioned spin-type debris collection bin is existing technology. For example, a cleaning device with automatic debris collection (CN212916656U) and a debris cleaning and collection structure (CN220592439U) can both achieve the function of spin-type 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 markers (CN2023110415273) and an indoor positioning method and system based on infrared rays (CN201811564420.7), both of which can realize the function of adjusting the direction of high-speed nozzles in real time.

[0020] Compared with existing technologies, this invention achieves high cleanliness, active coupling, and deep compaction of the pit repair interface by constructing a three-stage repair system of "debridement-interface activation-biomimetic filling". This invention establishes a gradient chemical barrier and molecular bonding at the interface, significantly improving the adhesion strength and durability of the new and old materials. The use of frequency-adjustable vibration compaction equipment greatly enhances the compaction and uniformity of the repair material, reducing the risk of loosening and unevenness. Simultaneously, this process is convenient and fast, completing the repair of a single pit and opening it to traffic within 45 minutes, more than doubling the construction efficiency compared to traditional methods. Furthermore, the extended lifespan of the repair layer reduces the frequency and cost of maintenance throughout its life cycle. In summary, this invention effectively solves the technical problem of easy debonding and failure of pit repair layers in chloride-rich environments, demonstrating significant technological advancement.

[0021] The main principles and key functions of this invention are as follows: A. Debris Removal Stage Principle: A powerful airflow generated by a high-pressure cyclone thoroughly cleans the potholes. The high-speed airflow, under the influence of a venturi tube, creates localized negative pressure, selectively adsorbing fine, loose debris without damaging surrounding intact material, achieving complete removal of residue (residue rate <0.3%). Simultaneously, the abrasive effect carried by the high-speed airflow creates a micro-rough structure (Ra≈1.5μm) on the pothole surface. This multi-scale rough interface provides more mechanical interlocking sites for subsequent bonding, essentially "etching" numerous micro-grooves into the old pavement, improving interfacial adhesion from both macroscopic and microscopic perspectives.

[0022] B. Interface Activation Stage Principle: By introducing nano-silane coupling agents into 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 polar groups (carboxyl groups, hydroxyl groups, 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 layer (silica or hydration products on the aggregate surface) under alcohol condensation reaction. This double-bonding mechanism builds a molecular bridge at the interface of new and old materials, achieving chemical coupling. Simultaneously, the quaternary ammonium salt cation groups introduced into the silane coupling agent molecule can chelate free Cl... - This process "locks" chloride ions within the interface coating, preventing them from penetrating further downwards. The interface activation stage of this invention establishes a dual structure at the pit interface: an organic-inorganic hybrid layer and an ion barrier layer. This enhances interface durability through both chemical bonding and media barrier effects.

[0023] C. Biomimetic Filling Stage Principle: Through layered filling and dynamic vibration compaction of the mixture, reliable layer-by-layer bonding between the filler material and the substrate is ensured. The rubber-modified asphalt mixture used in this invention has unique viscoelastic behavior, and its loss factor tanδ reflects the ratio of energy dissipation to elastic energy storage within the material. When the vibration frequency matches the characteristic frequency within the material, the mixture will be in a resonant state conducive to particle rearrangement, which helps the aggregate skeleton to quickly and compact. This invention utilizes frequency-adjustable vibration compaction equipment, employing low-frequency large amplitude, medium-frequency medium amplitude, and high-frequency small amplitude vibration modes for different stages of initial compaction, intermediate compaction, and final compaction, so that aggregates of different particle sizes (coarse, medium, and fine) sequentially reach the optimal density (see the implementation section for details). This step-by-step vibration compaction not only improves compaction efficiency but also avoids aggregate segregation that may be caused by a single high-frequency vibration, making the repair layer dense and uniform. At the same time, the rubber-modified asphalt imparts excellent fatigue and crack resistance to the mixture, and combined with high compaction, it can effectively resist repeated stress under vehicle loads. The biomimetic filling stage of this invention ensures sufficient anchoring and high density between the repair material and the base layer through layered vibration compaction, minimizing residual voids and stress concentration, thereby significantly improving the overall structural strength and long-term performance of the repair layer.

[0024] Through the synergistic effect of the aforementioned three-tiered principles, this invention achieves a systematic improvement from the interface to the overall structure in pothole repair: debridement improves the physical bonding conditions of the interface, interface activation establishes chemical bonding and a protective barrier, and biomimetic filling ensures the density and stability of the internal structure. This innovative process greatly overcomes the shortcomings of traditional processes and pioneers a new mechanism for pothole repair.

[0025] The invention has achieved significant technical results after laboratory and actual road testing.

[0026] (1) Significantly improved interfacial bonding performance: According to laboratory testing and the JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" standard, the direct pull-out strength of the repair interface of this invention reached 2.5-3.2 MPa. Under the environment of 120 hours of erosion in sodium chloride and magnesium chloride solutions with mass fractions of 3% and 6%, the interfacial bonding strength of the repair layer reached 1.8 MPa and 1.6 MPa, respectively, which are 68.7% and 80.1% higher than those of traditional repair processes. The above results show that this invention significantly enhances the bonding strength between new and old materials through interfacial activation, especially maintaining stable interfacial strength under chloride salt erosion environment, and is not prone to peeling failure.

[0027] (2) Significantly Improved Resistance to Chloride Ion Corrosion and Durability: This invention endows the repair layer with excellent resistance to environmental corrosion by constructing a gradient chemical barrier layer and a molecular bonding interface. Accelerated corrosion tests in the laboratory show that, under simulated salt spray corrosion conditions, the chloride ion penetration in the interface area of ​​the repair layer is significantly reduced compared to traditional processes, effectively blocking the migration path of corrosive media to the substrate and significantly delaying the interface deterioration process. Based on the verification results of the standard multiaxial loading fatigue test (ASTM D7460), the fatigue resistance of the repair layer under cyclic loading is significantly better than that of conventional hot-applied materials, with a significantly improved fatigue life. Furthermore, the failure mode changes from interfacial peeling to internal material fracture, indicating a synergistic enhancement of interfacial bonding strength and overall structural durability. Long-term service performance prediction analysis further shows that the expected lifespan of the repair layer under the coupled effects of complex environments is several times longer than that of traditional processes, which can significantly reduce the frequency of repeated repairs and lower the total life-cycle maintenance cost.

[0028] (3) Outstanding advantages in construction efficiency and economy: This invention adopts an integrated innovation of modular debridement device, rapid consolidation interface activation technology and intelligent dynamic compaction process to achieve a comprehensive improvement in repair work efficiency. Actual engineering applications show that 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 full life cycle cost model calculation results show that this process has significant comprehensive economic advantages in the material, construction and maintenance stages, and is especially suitable for the rapid repair needs of high traffic load road sections and harsh environmental areas, with broad engineering applicability and promotion value.

[0029] In summary, this invention, through the innovative construction of a three-stage repair system of "debridement-interface activation-biomimetic filling", achieves a comprehensive improvement in the strength, durability, and construction efficiency of the pit repair interface. It can significantly extend the service life of the repair layer and reduce maintenance costs, thus having good social and economic benefits. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the debridement stage process in this invention; Figure 2 This is a schematic diagram of the process operation in the interface activation stage of this invention; Figure 3 This is a schematic diagram of the process operation of the biomimetic filling stage in this invention; Figure 4 The hydrolysis reaction and hydrolysis mechanism of the silane coupling agent in this invention; Figure 5 This describes the reaction mechanism of silanol condensation to form a Si-O-Si three-dimensional network framework in this invention; Figure 6 This describes the reaction mechanism of silane bonding with the substrate (aggregate / asphalt surface) in this invention; Figure 7 This refers to the condensation reaction between amino groups (-NH2) and asphalt carboxylic acid groups (-COOH) in this invention; Figure 8 This is a graph showing the aggregate gradation in this invention; Figure 9 This is a schematic diagram of the high-pressure cyclone debridement device in this invention; exist Figure 9 In the middle, 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 bin. Detailed Implementation

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings, embodiments, specific application embodiments, and comparative embodiments. It should be noted that, unless otherwise specified, the various technical features or steps of the present invention can be arbitrarily combined to form more implementation schemes, and those skilled in the art should understand that these modifications all fall within the protection scope of the present invention. Example

[0032] A composite process for repairing potholes in rubber-modified asphalt pavements resistant to chloride salt erosion includes the following three steps: A. Debridement stage: The pit is cleaned using a high-pressure cyclone debridement device. Loose debris is flushed out by high-speed airflow, and the bottom and edges of the pit are roughened to form a clean but rough repair interface. B. Interface activation stage: Spray an interface binder containing nano-silane coupling agent onto the cleaned pothole interface, allowing it to penetrate into the original pavement material to a depth of 3-5 mm, and react chemically with the matrix material to form an organic-inorganic hybrid film with Si-O-Si covalent bonds and quaternary ammonium salt cationic groups, thereby constructing a chloride ion migration barrier layer. C. Bionic filling stage: Rubber-modified asphalt mixture is filled in layers and compacted in stages using frequency-adjustable vibration compaction equipment. Through low-frequency, medium-frequency, and high-frequency graded vibration, the aggregates at each level are fully compacted and interlocked to form a repair layer that is firmly bonded to the original pavement and highly dense.

[0033] The high-pressure cyclone debridement device uses compressed air to generate an airflow of 0.8–1.2 MPa through a Venturi accelerator tube. The airflow is then sprayed at high speed from a nozzle with a diameter of Φ6–8 mm and a spray angle of 60–75° to clean the pits and grooves. The local negative pressure generated by the Venturi tube adsorbs debris, resulting in a debris removal rate of ≥98% at the pit and groove interface and a surface roughness Ra=1.2–1.8 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% quaternary ammonium salt modifier. The interface binder 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 pH=4.5. During use, components A and B are mixed at the nozzle and then sprayed evenly on the surface of the pit at a spraying speed of 300 to 400 g / m² to form a thin and uniform activated coating. This activated coating penetrates downward under the drive of capillary action to form a gradient transition zone with a penetration depth of 3 to 5 mm. After the penetrated silane molecules undergo 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.

[0035] Rubber-modified asphalt mixtures include the following components: (1) Base asphalt: 70# asphalt, penetration 60-80 (0.1mm); (2) Waste tire rubber powder: 40 mesh fineness, the dosage is 18-22% of the weight of the base asphalt; (3) Composite stabilizer: silane coupling agent, with a dosage of 0.3-1.0% of the weight of the base asphalt; The aggregate gradation adopts a 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) Pretreatment of base asphalt: Heat 70# base asphalt to 160-170℃ to a molten state and keep it at a constant temperature for later use; (2) Pretreatment of rubber powder: Place 40-mesh waste tire rubber powder in an oven at 105±5℃ and dry for 2-3 hours to remove surface moisture; (3) Gradient mixing: Under the condition of stirring speed of 800-1200 r / min, the pretreated rubber powder is added to the molten asphalt in three batches, with an interval of 5-8 minutes between each batch, and the total amount is controlled to be 18-22% of the asphalt mass; (4) High-speed shearing modification: Transfer the mixture to a shear emulsifier and shear it at 4000-5000 r / min for 45-60 minutes at 180-185℃; (5) Swelling and development: After shearing, transfer to a development tank and develop at low speed for 2-3 hours at 170-175℃ and 200-300r / min; (6) Stabilization treatment: Add 0.3-1.0% of the asphalt mass of silane coupling agent as a stabilizer, and continue stirring for 20-30 minutes until the system is homogenized before use.

[0037] In the graded vibration, the vibration compaction frequency and amplitude are as follows: low frequency stage 30-35Hz, 2-3mm; medium frequency stage 40-45Hz, 1-1.5mm; high frequency stage 50-55Hz, 0.5-0.8mm. 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 consists of two stages: the first stage involves natural curing at room temperature for 20 minutes, which allows the silane to gradually hydrolyze and initially polymerize to build a three-dimensional network framework of -Si-O-Si; the second stage involves using hot air at around 60°C to assist in the curing of the interface layer for 10 minutes, which promotes the condensation and bonding reaction between the -NH2 and other functional groups in the silane molecules and the asphaltene. Example

[0039] A high-pressure cyclone debridement device is applied in the composite process of repairing potholes in rubber-modified asphalt pavements resistant to chloride salt corrosion. It includes a spray gun body 1, a venturi tube 2, a high-precision infrared positioning system 6, a high-speed nozzle 7, a multi-stage accelerating nozzle 8, and a spinning debris collection chamber 9. A compressed air inlet 3 is located at the tail of the spray gun body 1, connected to an external compressed air source via a hose. The venturi tube 2 is located inside the spray gun body 1, with a throat length-to-diameter ratio of 8:1, used to accelerate compressed air into a high-speed, high-pressure airflow. The multi-stage accelerating nozzle 8 is connected to the venturi tube 2, featuring a tapered, progressively contracting structure to further increase the airflow velocity. The high-speed nozzle 7 is connected to the end of the multi-stage accelerating nozzle 8. The spinning debris collection chamber 9 is located on the lower side of the spray gun body 1 to collect debris blown out during the debridement process. The high-precision infrared positioning system 6 is located on the top of the spray gun body 1 to monitor and locate the position of the high-speed nozzle 7 in real time.

[0040] The system consists of a compressed air inlet 3, a venturi tube 2, a multi-stage accelerating nozzle 8, and a high-speed nozzle 7 connected sequentially to form a complete airflow channel. The spray angle of the high-speed nozzle 7 can be adjusted freely to propel high-speed airflow into the pit. A spin-type debris collection chamber 9 collects debris using a cyclone separation principle, preventing secondary pollution of the environment. A high-precision infrared positioning system 6 can adjust the direction of the high-speed nozzle 7 in real time, ensuring that the nozzle is precisely aligned with the pit requiring cleaning. Example

[0041] A composite process for repairing potholes in rubber-modified asphalt pavements resistant to chloride salt erosion includes the following three stages: (a) High-pressure cyclone debridement stage: The pit is cleaned using a high-pressure cyclone debridement device (see...). Figure 1 This process utilizes compressed air to generate an airflow of 0.8–1.2 MPa through a Venturi accelerator tube, which is then ejected at high speed from a nozzle (6–8 mm in diameter, 60°–75° spray angle). The high-speed airflow creates a strong vortex and localized negative pressure within the pit, rapidly blowing away loose debris, dust, and accumulated water. After cleaning, 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 interfacial adhesive. (II) Nanosilane Interface Activation Stage: After debridement, immediately spray a nanosilane interface activation adhesive onto the pit interface (see...). Figure 2The nano-silane interface-activating binder, through its main component γ-aminopropyltriethoxysilane (APTES), chemically reacts with the hydroxyl groups on the aggregate surface to form chemical bonds, enhancing the interfacial bonding between asphalt and aggregate. Simultaneously, its excellent dispersibility and compatibility allow it to fill micropores at the interface, reducing porosity and decreasing chloride ion penetration channels. Furthermore, it improves the microstructure of asphalt, making it denser and more uniform, reducing chloride ion diffusion paths and adsorption sites, and increasing the surface energy and wettability of asphalt, resulting in a more uniform asphalt film covering the aggregate surface and effectively preventing chloride ion intrusion. The nano-silane binder also forms a hydrophobic and chloride ion-resistant protective film on the aggregate surface, blocking chloride ions from contacting the aggregate and reacting with asphalt components to generate... This adhesive forms a stable chemical structure, reducing the chemical degradation of asphalt under the action of chloride ions, thereby significantly improving the resistance to chloride ion erosion at the asphalt / aggregate interface and extending the service life of the road. The adhesive uses 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 pH≈4.5. Using specialized spraying equipment, the two components are mixed at the nozzle and then evenly sprayed onto the surface of the pothole. The spraying dosage is approximately 300–400 g / m², forming a thin and uniform activated coating at the pothole interface. This coating penetrates downwards under capillary action, forming a gradient transition zone with a penetration depth of approximately 3–5 mm. After the penetrated silane molecules undergo hydrolysis and condensation reactions with the substrate, they solidify at the interface to form a dense silica network film. A two-stage curing process is employed: In the first stage, natural curing at room temperature (approximately 25°C) for 20 minutes allows silanes to gradually hydrolyze and initially polymerize, building a three-dimensional Si-O-Si network framework. In the second stage, hot air at approximately 60°C is used to assist in the curing of the interface layer for 10 minutes, promoting the condensation and bonding reaction between functional groups such as -NH2 in the silane molecules and the asphaltene. This gradient curing process ensures that the interface layer fully reacts and solidifies from the inside out, resulting in a hybrid adhesive layer with excellent mechanical and durability properties, ultimately forming an activated interface layer. On one hand, the silane coupling effect tightly bonds the new and old materials; on the other hand, its dense structure blocks harmful media such as chloride ions from the interface, providing long-term protection for the repair layer.

[0042] The physicochemical reactions involved in the activation process of nano-silane interfaces are as follows: ① Hydrolysis reaction of silane coupling agent (APTES): NH2 (CH2)3Si(OC2H5)3+3H2O→NH2(CH2)3Si(OH)3+3C2H5OH ②Silyl alcohol condensation forms a 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 the substrate (aggregate / asphalt surface): NH2(CH2)3Si(OH)3 + base-OH → base-O-Si(OH)2(CH2)3NH2 + H2O ④ Condensation reaction of amino groups (-NH2) with pitch carboxylic acid groups (-COOH): NH2(CH2)3Si-O- + bitumen-COOH → bitumen-CONH-(CH2)3Si-O- + H2O ⑤ Physical filling effect of nano-SiO2 particles Nano-SiO2 (particle size 30-50nm) serves as an inert carrier, enhancing the density of the interface layer by physically filling microcracks: SiO2 (nanoparticles) + microcracks → composite structure that fills the cracks.

[0043] (III) Biomimetic Filling and Compaction Stage: After the interface activation treatment is completed and the mixture is slightly dried, the rubber-modified asphalt mixture can be filled and compacted (see...). Figure 3 The rubber-modified asphalt mixture selected in this invention employs an optimized material design: 70# base asphalt is used (basic indicators are shown in Table 1), and the content of 40-mesh fine rubber powder is 18%–22%. Based on the indicators of the base asphalt mixture, the performance indicators of the rubber-modified asphalt are measured and are shown in Table 2. The aggregate gradation adopts a discontinuous gradation (S-shaped curve, as shown in Table 2). Figure 8 As shown), to provide a good skeleton interlocking structure and bitumen membrane wrapping.

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

[0045] During filling, the mixture is laid in 2-3 layers depending on the pit depth, with each layer not exceeding 5cm in thickness to facilitate compaction. The compaction process uses a frequency-adjustable vibratory compactor for staged rolling: ① Initial compaction stage: compaction is carried out with low-frequency vibration of approximately 30Hz, with the excitation energy controlled at 120-150kN·m. The main goal is to settle and interlock the coarse-sized aggregates, eliminating large voids; ② Secondary compaction stage: compaction continues with medium-frequency vibration of approximately 40Hz, increasing the contact stress between the compaction wheel and the mixture to 0.4-0.6MPa, further densifying the medium-sized aggregates and approaching the theoretical maximum density; ③ Final compaction stage: the surface layer is compacted with high-frequency vibration of approximately 50Hz, reducing the amplitude to refine the surface, eliminating structural depths greater than 5mm, and ultimately obtaining a smooth and dense surface structure. Throughout the compaction process, the vibration parameters can be adjusted in real time according to changes in the temperature and density of the mixture. The vibratory compaction equipment of this invention integrates an intelligent control module, including: a compaction degree closed-loop control unit based on the falling weight deflection (FWD) modulus, 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 temperature field of the mixture (sampling frequency 10Hz), used to ensure that the vibratory compaction is carried out within a suitable temperature range to avoid the material loosening due to overcooling compaction; and a vibration frequency adaptive adjustment algorithm control module, which can automatically optimize the vibration frequency according to the change in the stiffness of the mixture fed back by the sensor.

[0046] Table 1 Performance test results of base asphalt

[0047] Table 2. Performance Tests of Rubber-Modified Asphalt Mixtures

[0048] The vibration compaction equipment in this invention can intelligently adapt to changes in the mechanical state of the mixture during the compaction process, avoiding under-compaction or over-compaction. This allows the compaction degree of the repair layer of this invention to reach more than 98%, which is a significant improvement compared to traditional processes. Furthermore, the density of each internal layer is uniform and consistent, with no significant differences.

[0049] To further illustrate the beneficial effects of the present invention, three specific application embodiments and corresponding comparative embodiments are provided below. All embodiments were tested under similar conditions. The comparative embodiments do not employ all the key technical features of the present invention and 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 highway toll plaza in a coastal area was selected for on-site repair testing. This section of road has been subjected to long-term exposure to sea salt and vehicle braking, resulting in severe aging and significant surface contamination around the pothole.

[0051] Repair Process: The pothole was repaired using the process described in this invention. First, a high-pressure cyclone cleaning device was used to thoroughly clean the pothole: the air pressure was set to 1.0 MPa, the spray angle was approximately 70°, and the device was slowly moved 10 cm from the pothole surface. Within approximately 20 seconds, all loose asphalt fragments and dust were flushed out, leaving the base firm but slightly rough. Next, a two-component spraying device was used to evenly spray a nano-silane interface agent onto the bottom and surrounding walls of the pothole, with an actual dosage of approximately 350 g / m². The interface agent penetrated and wetted the base, and after about 5 minutes, the surface became sticky and slightly glossy. Then, two layers of rubber-modified asphalt mixture heated to 160°C (20% rubber powder, target density 2.35 g / cm³) were filled in, each layer approximately 4 cm thick. Compaction was carried out using a small, frequency-adjustable vibratory roller: the first layer was compacted four times with a low-frequency (30Hz) vibratory roller; the second layer was compacted six times with a medium-frequency (40Hz) vibratory roller after paving; and finally, the surface was compacted twice with a high-frequency (50Hz) vibratory roller to remove any marks. The entire construction process, from initial cleaning to final compaction, took 40 minutes. After 15 minutes, the repaired layer cooled to below 50°C, at which point traffic could resume.

[0052] Performance Testing: Sampling and on-site testing were conducted on the repaired area 28 days after repair. The pull-out test revealed an interfacial bond strength of 2.05 MPa, significantly higher than the interfacial strength between the surrounding original pavement structural layers (approximately 1.2 MPa). A splitting crack test was used to determine low-temperature crack resistance; the repair material achieved a splitting strength of 4.8 MPa at -10°C, with the fracture occurring within the new material and no interface separation. Immersion of the repaired specimen in a 3% NaCl solution for 30 days showed a chloride ion diffusion depth of only 2.1 mm, while the comparative specimen (without an interface agent) exhibited a chloride ion penetration depth exceeding 6 mm.

[0053] Test results show that the repair layer of this invention adheres firmly to the original road surface and has good waterproof and salt erosion resistance. On-site observation shows that the repaired potholes remained intact after a winter of freeze-thaw cycles, with no edge peeling or cracking observed.

[0054] Application Example 2: Project Background: A winter repair test was conducted on potholes on a main road in a city in northern my country. The potholes were approximately 0.5m x 0.5m in size and 0.06m deep. The ambient temperature during the repair work was -5℃, and the road surface temperature was approximately -3℃, which is considered extremely cold conditions.

[0055] Repair Process: Repair work was carried out according to the process of this invention. Due to the low temperature, windbreaks were first placed around the pothole, and the surface of the pothole was quickly preheated to about 0°C using a blowtorch. Immediately afterwards, a high-pressure cyclone cleaning device was used to remove debris and ice crystals (pressure set at 1.2 MPa to enhance the removal of icing impurities). For the interface treatment stage, a fast-curing nano-silane interface agent was selected (the catalyst dosage was increased to ensure a faster reaction 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 in this invention (which maintains appropriate work consistency at room temperature), with 18% rubber powder and a certain proportion of early-strength cement added to the aggregate to promote low-temperature hardening. After filling the pothole in two stages, a small vibratory compactor with an insulated canvas cover was used for compaction. Considering the increased viscosity of materials at low temperatures, the compaction strategy was adjusted as follows: first, compaction was performed with a high-excitation force at 35Hz to initially densify the mixture; then, the frequency was reduced to 25Hz for multiple passes of rolling to further compact the aggregate using a larger amplitude; finally, surface vibration was performed at 45Hz for finishing. The entire repair process took approximately 55 minutes, slightly longer than the construction time at room temperature, but still significantly faster than traditional hot patching that requires heating equipment.

[0056] Performance Testing: Seven days after repair, core samples were drilled on-site to test mechanical properties. A splitting tensile strength test was conducted at -5℃, showing the repair material's splitting tensile strength to be 3.6 MPa, a 50% improvement compared to traditional cold-applied materials (2.4 MPa). After subjecting the core samples to 10 freeze-thaw cycles between -20℃ and +20℃, the interfacial bond strength retention rate was measured at 88%, significantly higher than the control group (58%) without an interfacial agent. After spraying the repaired area with salt water and observing it over a winter, no peeling occurred at the repair layer edges, and no internal loosening or subsidence occurred. This test demonstrates the applicability and reliability of the invention's process in low-temperature environments: even in extremely cold conditions, it can ensure a strong interface and optimal material performance, rapidly restoring road use.

[0057] Application Example 3: Project Background: In a municipal road maintenance project, the process of this invention was used to maintain and reinforce three potholes that had repeatedly failed to respond to repairs. The three potholes were located near a bus lane and a speed bump in front of a traffic light, respectively, and were subjected to repeated heavy loads and long-term erosion by de-icing agents. They had previously been filled twice with traditional hot fillers, but both times the potholes loosened and broke again within one year.

[0058] Repair Process: For the aforementioned challenging road sections, the process of this invention is used for enhanced repair. The construction steps are similar to those in Example 1, but with enhancements in materials and processes: (a) In the cleaning stage, infrared-assisted positioning is added to the standard device to ensure more thorough cleaning; (b) The content of silane coupling agent in the interface agent formula is increased to 20%, and 2% epoxy resin by mass is added as an auxiliary binder to further improve interface strength; (c) The rubber powder content in the filler mixture is set to the maximum of 22%, and an additional 0.3% glass fiber is added to improve the crack resistance of the repair layer. During the compaction stage, the intelligent compaction system of this invention is used to monitor the compaction modulus in real time on site. When the surface equivalent modulus calculated by FWD test reaches 3,000 MPa, compaction is stopped to avoid excessive damage to the skeleton. Traffic is opened 1 hour after construction is completed.

[0059] Performance Testing: The repaired potholes were monitored at 3, 6, and 12 months. At 3 months, core samples showed the repair layer had a Marshall stability of 14.8 kN and a splitting tensile strength of 2.1 MPa, both significantly higher than traditional hot-dip mortise repair materials (stability approximately 10 kN, splitting tensile strength 1.3 MPa). At 6 months, a field transverse shear test was conducted under high summer temperatures. The repair layer showed no shear failure, with a shear strength of 1.5 MPa, while traditional repair materials showed slight displacement under the same conditions. After 12 months, following a winter and summer, core drilling revealed no significant delamination between the repair layer and the original pavement, and the interfacial shear strength remained at 1.2 MPa, more than double that before the first treatment. In summary, these three potholes repaired using this invention's process remained intact and stable during the one-year trial period, providing a stark contrast to newly formed potholes in adjacent untreated areas, demonstrating the excellent long-term performance of this invention's process.

[0060] Comparative Example 1: For the potholes described in Example 1, a comparative test was conducted using a traditional hot-mix asphalt repair process. The specific procedure was as follows: the pothole was simply cut and cleaned vertically on all four sides using a pneumatic hammer. After manually removing large pieces of gravel, no special interface agent was used; instead, the bottom of the pothole was heated with a flame torch for about one minute, and then a layer of hot asphalt binder was poured on while still hot as a tack coat. Ordinary hot-mix asphalt mixture (AC-13) was then filled in, and repeatedly compacted with a tamping hammer and a small steel wheel roller until the surface was basically smooth. The construction took approximately 1.5 hours. After 28 days of curing, the traditional repair layer underwent the same testing. The results showed that the interfacial pull-out strength was 0.75 MPa, about 40% lower than that of Example 1 (2.05 MPa); after water immersion and freeze-thaw cycles, significant peeling damage occurred at the interface, and the strength retention rate dropped below 60%. Fine cracks were observed at the junction of the repair material and the old pavement, presumably due to insufficient interfacial bonding. This comparison illustrates that traditional heat repair processes suffer from poor interfacial bonding and durability compared to the process of this invention due to incomplete interface cleaning and aging caused by heating.

[0061] Comparative Example 2: For the potholes in Example 2 under low-temperature conditions, a conventional cold-patch asphalt material was used for repair and comparison. Commercially available bagged cold-patch material was selected, with interface treatment consisting only of brushing an epoxy primer onto the inner wall of the pothole, followed by direct filling with the cold-patch mixture and compaction using a tamper and manual treading. Due to the very low temperature, the epoxy primer was covered before it fully cured on the pothole surface. After repair, the surface was left to stand for 2 hours before traffic was allowed to resume. Following the same low-temperature and freeze-thaw tests, it was found that the initial pull-out strength of the cold-patch repair layer was only 0.6 MPa, and after being exposed to -10℃ for 3 months, it completely lost its bond, and the material loosened upon hand-hammering. Analysis suggests that conventional cold-patch materials struggle to form effective bonds with the existing pavement at low temperatures. On one hand, the epoxy binder reacts slowly at low temperatures and has limited effect on moist interfaces; on the other hand, the cold-patch mixture itself is insufficiently compacted and has low strength due to temperature effects. 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 impact of differences in interface waterproofing materials, a comparative indoor test similar to that in Example 1 was conducted. In one group of specimens, the interface treatment involved spraying a traditional silicate-based waterproofing agent (a commercially available sodium silicate solution diluted 1:1 with water) onto the cleaned pit interface. After 5 minutes of penetration, the same rubber-modified asphalt mixture as in Example 1 was filled and compacted. The other control group was treated with the nano-silane interface agent of this invention before filling and molding. Both groups of specimens underwent chloride salt corrosion tests after 7 days of standard curing: immersion in a 3% NaCl solution for 60 days, followed by cross-sectional microstructural analysis of the interface. The results showed that the specimens treated with the silicate waterproofing agent generated a large number of white crystals near the interface, and further XRD analysis confirmed that their main component was Friedel salt. These crystals accumulated in the interface area and expanded in volume, resulting in visible fine cracks between the old and new materials; the interfacial bond strength of the corresponding specimens decreased by 52% compared to before immersion. In contrast, the specimens treated with the silane interface agent of this invention did not show any interface salt crystal precipitation, the interface structure remained intact, and the bond strength decreased by only about 10%. The comparative test shows that traditional silicate interface sealing materials may have harmful reactions in chloride salt environments, which will exacerbate interface damage. However, the silane coupling interface activation layer used in this invention can withstand chloride salt corrosion and continue to play an interface protection role.

[0063] The foregoing has shown and described 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 invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the protection scope of the present invention.

Claims

1. A rubber modified asphalt pavement pothole repair composite process resistant to attack by chlorides of sodium, potassium, magnesium, calcium, and ammonium characterized in that, It includes the following three steps: A. Debridement stage: The pit is cleaned using a high-pressure cyclone debridement device. Loose debris is flushed out by high-speed airflow, and the bottom and edges of the pit are roughened to form a clean but rough repair interface. B. Interface activation stage: Spray an interface binder containing nano-silane coupling agent onto the cleaned pothole interface, allowing it to penetrate into the original pavement material to a depth of 3-5 mm, and react chemically with the matrix material to form an organic-inorganic hybrid film with Si-O-Si covalent bonds and quaternary ammonium salt cationic groups, thereby constructing a chloride ion migration barrier layer. C. Bionic filling stage: Rubber-modified asphalt mixture is filled in layers and compacted in stages using frequency-adjustable vibration compaction equipment. Through low-frequency, medium-frequency, and high-frequency graded vibration, the aggregates at each level are fully compacted and interlocked to form a repair layer that is firmly bonded to the original pavement and highly dense.

2. The rubber modified bituminous pavement pothole repair composite process against attack of chloro-salt as claimed in claim 1, wherein: The high-pressure cyclone debridement device uses compressed air to generate an airflow of 0.8–1.2 MPa through a Venturi accelerator tube, which is then sprayed at high speed from a nozzle with a diameter of Φ6–8 mm and a spray angle of 60–75° to clean the pits. The local negative pressure generated by the Venturi tube adsorbs debris, resulting in a debris removal rate of ≥98% at the pit interface and a surface roughness Ra=1.2–1.8 μm.

3. The rubber modified bituminous pavement pothole repair composite process against attack of chloro-salt as claimed in claim 1 wherein: The nano-silane coupling agent is γ-aminopropyltriethoxysilane with a mass concentration of 2% to 5%, and contains 0.5% to 1.5% quaternary ammonium salt modifier. The interface binder 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 pH=4.

5. During use, components A and B are mixed at the nozzle and then sprayed evenly on the surface of the pit at a spraying speed of 300 to 400 g / m² to form a thin and uniform activated coating. This activated coating penetrates downward under the drive of capillary action to form a gradient transition zone with a penetration depth of 3 to 5 mm. After the penetrated silane molecules undergo 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 in rubber-modified asphalt pavement resistant to chloride salt erosion according to claim 1, characterized in that, The rubber-modified asphalt mixture comprises the following components: (1) Base asphalt: 70# asphalt, penetration 60-80 (0.1mm); (2) Waste tire rubber powder: 40 mesh fineness, the dosage is 18-22% of the weight of the base asphalt; (3) Composite stabilizer: The dosage is 0.3% to 1.0% of the weight of the base asphalt; The aggregate gradation adopts a discontinuous gradation S-shaped curve, and the void ratio is controlled at 2-4%.

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

6. The composite process for repairing potholes in rubber-modified asphalt pavement resistant to chloride salt erosion according to claim 1, characterized in that: In the graded vibration, the vibration compaction frequency and amplitude are as follows: low frequency stage 30-35Hz, 2-3mm; medium frequency stage 40-45Hz, 1-1.5mm; high frequency stage 50-55Hz, 0.5-0.8mm. 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 in rubber-modified asphalt pavement resistant to chloride salt erosion according to claim 3, characterized in that: The two-stage curing process consists of two stages: the first stage involves natural curing at room temperature for 20 minutes, allowing the silane to gradually hydrolyze and initially polymerize to build a -Si-O-Si- three-dimensional network framework; the second stage involves using hot air at around 60°C to assist in curing the interface layer for 10 minutes, promoting the condensation and bonding reaction between the -NH2 and other functional groups in the silane molecules and the asphaltene.

8. The composite process for repairing potholes in rubber-modified asphalt pavement resistant to chloride salt erosion according to claim 1, characterized in that: The high-pressure cyclone debridement device includes a spray gun body (1), a venturi tube (2), a high-precision infrared positioning system (6), a high-speed nozzle (7), a multi-stage accelerating nozzle (8), and a spin-type debris collection chamber (9). The spray gun body (1) is provided with a compressed air inlet (3) at its tail end, which is connected to an external compressed air source through a hose. The venturi tube (2) is located inside the spray gun body (1), and its throat has a length-to-diameter ratio of 8:1, which is used to accelerate the compressed air to form a high-speed, high-pressure airflow. The multi-stage accelerating nozzle (8) is connected to the venturi tube (2) and has a tapered, progressively contracting structure to further increase the airflow speed. The high-speed nozzle (7) is connected to the end of the multi-stage accelerating nozzle (8). The spin-type debris collection chamber (9) is located on 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 located on the top of the spray gun body (1) and monitors and positions the high-speed nozzle (7) in real time.

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

10. The composite process for repairing potholes in rubber-modified asphalt pavement resistant to chloride salt erosion according to claim 8, characterized in that: The spin-type 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 that needs to be cleaned.

Images