Environment-friendly asphalt concrete crack pouring material based on recycled asphalt mixture (RAP) and construction method of environment-friendly asphalt concrete crack pouring material

Abstract

The invention provides an environment-friendly asphalt concrete crack pouring material based on a recycled asphalt mixture (RAP). The environment-friendly asphalt concrete crack pouring material comprises the following components in percentage by weight: 40-60% of recycled asphalt mixture (RAP) particles; 20%-30% of new asphalt; 5%-10% of a regenerant; 1%-3% of toughening fibers; 5%-15% of mineral filler; and 0.5%-1% of an anti-aging agent. Through the synergistic effect of the RAP particles and the regenerant, the performance of the aged asphalt is recovered, the cost is reduced, the toughening fibers form a three-dimensional network structure, the crack resistance and fatigue resistance of the crack pouring material are improved, the energy consumption is reduced at the low construction temperature (80-100 DEG C), and the high-temperature aging problem of traditional hot asphalt is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of caulking materials, and specifically relates to an environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) and a construction method thereof. Background Art

[0002] Asphalt pavement is a flexible road surface characterized by short traffic closure times, high driving comfort, and excellent wear and skid resistance. However, due to the strong temperature sensitivity of the asphalt binder, at low ambient temperatures, the asphalt becomes brittle and hard, with low fracture toughness, prone to low-temperature brittle fracture, resulting in transverse thermal shrinkage cracks in the pavement. Furthermore, increasing traffic loads can also cause fatigue cracking in the pavement.

[0003] Disadvantages of traditional caulking materials 1) Traditional caulking materials mostly use new asphalt or polymer-modified asphalt, which is costly and consumes a lot of resources; 2) Existing caulking materials are not weather-resistant enough and are prone to flowing at high temperatures or cracking at low temperatures; 3) The utilization rate of waste asphalt mixture (RAP) is low, and landfill disposal causes environmental pollution.

[0004] Therefore, it is necessary to design an environmentally friendly asphalt concrete grouting material based on recycled asphalt mixture (RAP) and its construction method. Summary of the Invention

[0005] In order to overcome the defects in the prior art, an environmentally friendly asphalt concrete grouting material based on recycled asphalt mixture (RAP) and a construction method thereof are provided.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: An environmentally friendly asphalt concrete crack filling material based on recycled asphalt mixture (RAP), comprising the following components by weight percentage: Recycled asphalt mixture (RAP) particles: 40% to 60%; New asphalt: 20% to 30%; Regeneration agent: 5% to 10%; Toughening fiber: 1% to 3%; Mineral filler: 5% to 15%; Anti-aging agent: 0.5%~1%.

[0007] Preferably, the RAP particles have a particle size of 0.1 to 2 mm and are preheated at 120° C. to 140° C. to remove moisture and impurities; The regeneration agent is a mixture of aromatic oil and asphalt activator, wherein the aromatic oil accounts for 60% to 80% and the activator is a sulfide or organic amine compound; The toughening fiber is polyester fiber or basalt fiber, and has a length of 3 to 6 mm; The mineral filler is limestone powder or Portland cement, with a fineness of ≥200 mesh; The anti-aging agent is a hindered amine light stabilizer (HALS) or carbon black, which is used to improve the material's resistance to ultraviolet rays and oxidative aging.

[0008] Preferably, the basalt fiber is also pretreated, and the specific pretreatment method is: The basalt fiber is stirred evenly in a sodium silicate solution with a volume of 3-5 times the total volume of the fiber, and then an additive with a volume of 20-30% of the total volume of the basalt fiber is added to the basalt fiber, and ultrasonic treatment is performed until the treatment is completed.

[0009] Preferably, the mass fraction of the sodium silicate solution is 5-8%; the ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment is performed for 1 hour.

[0010] Preferably, the preparation method of the additive is: 2-4 parts of lanthanum oxide and 1-3 parts of barium zirconate are added to 5-8 parts of sodium lignin sulfonate solution, and then 3-5 parts of boron nitride are added, stirred evenly, filtered, and dried to obtain an additive.

[0011] The basalt fiber is treated with sodium silicate solution and ultrasonically improved with additives. The raw materials such as lanthanum oxide, barium zirconate, and boron nitride in the additives are blended and improved to optimize the performance stability of the product.

[0012] Preferably, the mass fraction of the sodium lignin sulfonate solution is 5-8%.

[0013] The present invention also provides a method for preparing an environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP), comprising the following steps: The RAP particles are crushed and sieved to the target particle size and heated to 120°C to 140°C for pretreatment; Mix the new asphalt and the regeneration agent at 160℃~170℃ to form a composite asphalt binder; Add the pretreated RAP particles, mineral filler, toughening fiber and anti-aging agent in sequence, and stir at 150℃~160℃ for 20~30 minutes; The temperature is lowered to 80°C to 100°C to obtain a pumpable caulking material.

[0014] The present invention also provides a construction method of a caulking material, comprising the following steps: Crack pretreatment: Use high-pressure air or a mechanical brush to remove loose particles in the cracks to ensure that the cracks are clean and dry; Material grouting: Use grouting equipment to pump the grouting material into the cracks at a temperature of 80°C to 100°C, and grout in layers until dense; Surface treatment: After pouring, sprinkle fine sand or rubber particles with a particle size of ≤1mm before the material is completely solidified to enhance the surface's anti-slip and anti-ultraviolet capabilities.

[0015] Preferably, the thickness of each layer of the layered perfusion does not exceed 3 mm, and the interval time between adjacent layers is ≤ 5 minutes.

[0016] Preferably, the caulking material is suitable for repairing road cracks with a width of ≥3 mm, and traffic can be opened within 24 hours after caulking.

[0017] Compared with the prior art, the advantages and beneficial effects of the present invention are: Through the synergistic effect of RAP particles and regeneration agents, the performance of aged asphalt is restored and costs are reduced. The toughened fibers form a three-dimensional network structure, which improves the crack resistance and fatigue resistance of the caulking material. The low construction temperature (80-100℃) reduces energy consumption and avoids the high-temperature aging problem of traditional hot asphalt. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0019] In this application, an environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) includes the following components by weight percentage: Recycled asphalt mixture (RAP) particles: 40% to 60%; New asphalt: 20% to 30%; Regeneration agent: 5% to 10%; Toughening fiber: 1% to 3%; Mineral filler: 5% to 15%; Anti-aging agent: 0.5%~1%.

[0020] The RAP particles of this embodiment have a particle size of 0.1 to 2 mm and are preheated at 120°C to 140°C to remove moisture and impurities; The regeneration agent is a mixture of aromatic oil and asphalt activator, wherein the aromatic oil accounts for 60% to 80% and the activator is a sulfide or organic amine compound; The toughening fiber is polyester fiber or basalt fiber, and has a length of 3 to 6 mm; The mineral filler is limestone powder or Portland cement, with a fineness of ≥200 mesh; The anti-aging agent is a hindered amine light stabilizer (HALS) or carbon black, which is used to improve the material's resistance to ultraviolet rays and oxidative aging.

[0021] The basalt fiber of this embodiment is also pretreated, and the specific pretreatment method is as follows: The basalt fiber is stirred evenly in a sodium silicate solution with a volume of 3-5 times the total volume of the fiber, and then an additive with a volume of 20-30% of the total volume of the basalt fiber is added to the basalt fiber, and ultrasonic treatment is performed until the treatment is completed.

[0022] The mass fraction of the sodium silicate solution in this embodiment is 5-8%; the ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment is performed for 1 hour.

[0023] The preparation method of the additive of this embodiment is: 2-4 parts of lanthanum oxide and 1-3 parts of barium zirconate are added to 5-8 parts of sodium lignin sulfonate solution, and then 3-5 parts of boron nitride are added, stirred evenly, filtered, and dried to obtain an additive.

[0024] The mass fraction of the sodium lignosulfonate solution in this embodiment is 5-8%.

[0025] The present embodiment provides a method for preparing an environmentally friendly asphalt concrete crack filling material based on recycled asphalt mixture (RAP), comprising the following steps: The RAP particles are crushed and sieved to the target particle size and heated to 120°C to 140°C for pretreatment; Mix the new asphalt and the regeneration agent at 160℃~170℃ to form a composite asphalt binder; Add the pretreated RAP particles, mineral filler, toughening fiber and anti-aging agent in sequence, and stir at 150℃~160℃ for 20~30 minutes; The temperature is lowered to 80°C to 100°C to obtain a pumpable caulking material.

[0026] A method for constructing a caulking material according to this embodiment includes the following steps: Crack pretreatment: Use high-pressure air or a mechanical brush to remove loose particles in the cracks to ensure that the cracks are clean and dry; Material grouting: Use grouting equipment to pump the grouting material into the cracks at a temperature of 80°C to 100°C, and grout in layers until dense; Surface treatment: After pouring, sprinkle fine sand or rubber particles with a particle size of ≤1mm before the material is completely solidified to enhance the surface's anti-slip and anti-ultraviolet capabilities.

[0027] The thickness of each layer of the layered perfusion in this embodiment does not exceed 3 mm, and the interval between adjacent layers is ≤ 5 minutes.

[0028] The caulking material of this embodiment is suitable for repairing road cracks with a width of ≥3mm, and traffic can be opened within 24 hours after caulking.

[0029] The present application is further described below with reference to specific embodiments, comparative examples, and analytical tests: Example 1: An environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP), comprising the following components by weight percentage: Recycled asphalt (RAP) granules: 40%; New asphalt: 20%; Regeneration agent: 5%; Toughening fiber: 1%; Mineral filler: 5%; Anti-aging agent: 0.5%.

[0030] The RAP particles of this embodiment have a particle size of 0.1 mm and are preheated at 120° C. to remove moisture and impurities; The regeneration agent is a mixture of aromatic oil and asphalt activator, wherein the aromatic oil accounts for 60% and the activator is a sulfide or organic amine compound; The toughening fiber is polyester fiber or basalt fiber, and has a length of 3 mm; The mineral filler is limestone powder or Portland cement, with a fineness of ≥200 mesh; The anti-aging agent is a hindered amine light stabilizer (HALS) or carbon black, which is used to improve the material's resistance to ultraviolet rays and oxidative aging.

[0031] The basalt fiber of this embodiment is also pretreated, and the specific pretreatment method is as follows: The basalt fiber is stirred evenly in a sodium silicate solution 3 times the total amount of the fiber, and then an additive 20% of the total amount of the basalt fiber is added to the basalt fiber, and ultrasonic treatment is completed.

[0032] The mass fraction of the sodium silicate solution in this embodiment is 5%; the ultrasonic power of the ultrasonic treatment is 350 W, and the ultrasonic treatment is performed for 1 hour.

[0033] The preparation method of the additive of this embodiment is: 2 parts of lanthanum oxide and 1 part of barium zirconate are added to 5 parts of sodium lignin sulfonate solution, and then 3 parts of boron nitride are added, stirred evenly, and then filtered and dried to obtain an additive.

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

[0035] The present embodiment provides a method for preparing an environmentally friendly asphalt concrete crack filling material based on recycled asphalt mixture (RAP), comprising the following steps: The RAP particles were crushed and sieved to the target particle size and heated to 120°C for pretreatment; Mixing new asphalt with regeneration agent at 160°C to form composite asphalt binder; Add the pretreated RAP particles, mineral filler, toughening fiber and anti-aging agent in sequence and stir at 150°C for 20 minutes; The temperature is lowered to 80°C to obtain a pumpable caulking material.

[0036] A method for constructing a caulking material according to this embodiment includes the following steps: Crack pretreatment: Use high-pressure air or a mechanical brush to remove loose particles in the cracks to ensure that the cracks are clean and dry; Material grouting: Use grouting equipment to pump the grouting material into the cracks at a temperature of 80°C, and grout it layer by layer until dense; Surface treatment: After pouring, sprinkle fine sand or rubber particles with a particle size of ≤1mm before the material is completely solidified to enhance the surface's anti-slip and anti-ultraviolet capabilities.

[0037] The thickness of each layer of the layered perfusion in this embodiment does not exceed 3 mm, and the interval between adjacent layers is ≤ 5 minutes.

[0038] The caulking material of this embodiment is suitable for repairing road cracks with a width of ≥3mm, and traffic can be opened within 24 hours after caulking.

[0039] Example 2: An environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP), comprising the following components by weight percentage: Recycled asphalt (RAP) granules: 60%; New asphalt: 30%; Regeneration agent: 10%; Toughening fiber: 3%; Mineral filler 15%; Anti-aging agent: 1%.

[0040] The RAP particles of this embodiment have a particle size of 2 mm and are preheated at 140° C. to remove moisture and impurities; The regeneration agent is a mixture of aromatic oil and asphalt activator, wherein the aromatic oil accounts for 80% and the activator is a sulfide or organic amine compound; The toughening fiber is polyester fiber or basalt fiber, and has a length of 6 mm; The mineral filler is limestone powder or Portland cement, with a fineness of ≥200 mesh; The anti-aging agent is a hindered amine light stabilizer (HALS) or carbon black, which is used to improve the material's resistance to ultraviolet rays and oxidative aging.

[0041] The basalt fiber of this embodiment is also pretreated, and the specific pretreatment method is as follows: The basalt fiber is stirred evenly in a sodium silicate solution 5 times the total amount of the fiber, and then an additive 30% of the total amount of the basalt fiber is added to the basalt fiber, and ultrasonic treatment is completed.

[0042] The mass fraction of the sodium silicate solution in this embodiment is 8%; the ultrasonic power of the ultrasonic treatment is 400 W, and the ultrasonic treatment is performed for 1 hour.

[0043] The preparation method of the additive of this embodiment is: 4 parts of lanthanum oxide and 3 parts of barium zirconate are added to 8 parts of sodium lignin sulfonate solution, and then 5 parts of boron nitride are added, stirred evenly, and then filtered and dried to obtain an additive.

[0044] The mass fraction of the sodium lignosulfonate solution in this embodiment is 8%.

[0045] The present embodiment provides a method for preparing an environmentally friendly asphalt concrete crack filling material based on recycled asphalt mixture (RAP), comprising the following steps: The RAP particles were crushed and sieved to the target particle size and heated to 140°C for pretreatment; Mixing new asphalt with regeneration agent at 170°C to form composite asphalt binder; Add the pretreated RAP particles, mineral filler, toughening fiber and anti-aging agent in sequence and stir at 160°C for 30 minutes; The temperature is lowered to 100°C to obtain a pumpable caulking material.

[0046] A method for constructing a caulking material according to this embodiment includes the following steps: Crack pretreatment: Use high-pressure air or a mechanical brush to remove loose particles in the cracks to ensure that the cracks are clean and dry; Material grouting: Use grouting equipment to pump the grouting material into the cracks at a temperature of 100°C, and grout it layer by layer until dense; Surface treatment: After pouring, sprinkle fine sand or rubber particles with a particle size of ≤1mm before the material is completely solidified to enhance the surface's anti-slip and anti-ultraviolet capabilities.

[0047] The thickness of each layer of the layered perfusion in this embodiment does not exceed 3 mm, and the interval between adjacent layers is ≤ 5 minutes.

[0048] The caulking material of this embodiment is suitable for repairing road cracks with a width of ≥3mm, and traffic can be opened within 24 hours after caulking.

[0049] Example 3: In this example, an environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) includes the following components by weight percentage: Recycled asphalt (RAP) granules: 50%; New asphalt: 25%; Regeneration agent: 7.5%; Toughening fiber: 2%; Mineral filler: 10%; Anti-aging agent: 0.75%.

[0050] The RAP particles of this embodiment have a particle size of 1 mm and are preheated at 130° C. to remove moisture and impurities; The regeneration agent is a mixture of aromatic oil and asphalt activator, wherein the aromatic oil accounts for 70% and the activator is a sulfide or organic amine compound; The toughening fiber is polyester fiber or basalt fiber, and has a length of 4.5 mm; The mineral filler is limestone powder or Portland cement, with a fineness of ≥200 mesh; The anti-aging agent is a hindered amine light stabilizer (HALS) or carbon black, which is used to improve the material's resistance to ultraviolet rays and oxidative aging.

[0051] The basalt fiber of this embodiment is also pretreated, and the specific pretreatment method is as follows: The basalt fiber is stirred evenly in a sodium silicate solution 4 times the total amount of the fiber, and then an additive of 25% of the total amount of the basalt fiber is added to the basalt fiber, and ultrasonic treatment is completed.

[0052] The mass fraction of the sodium silicate solution in this embodiment is 6.5%; the ultrasonic treatment is performed at an ultrasonic power of 375 W and for 1 hour.

[0053] The preparation method of the additive of this embodiment is: 3 parts of lanthanum oxide and 2 parts of barium zirconate are added to 6.5 parts of sodium lignin sulfonate solution, and then 4 parts of boron nitride are added, stirred evenly, and then filtered and dried to obtain an additive.

[0054] The mass fraction of the sodium lignosulfonate solution in this embodiment is 6.5%.

[0055] The present embodiment provides a method for preparing an environmentally friendly asphalt concrete crack filling material based on recycled asphalt mixture (RAP), comprising the following steps: The RAP particles were crushed and sieved to the target particle size and heated to 130°C for pretreatment; Mixing new asphalt with regeneration agent at 165°C to form composite asphalt binder; Add the pretreated RAP particles, mineral filler, toughening fiber and anti-aging agent in sequence and stir at 155°C for 25 minutes; The temperature is lowered to 90°C to obtain a pumpable caulking material.

[0056] A method for constructing a caulking material according to this embodiment includes the following steps: Crack pretreatment: Use high-pressure air or a mechanical brush to remove loose particles in the cracks to ensure that the cracks are clean and dry; Material grouting: Use grouting equipment to pump the grouting material into the cracks at a temperature of 90°C, and grout it layer by layer until dense; Surface treatment: After pouring, sprinkle fine sand or rubber particles with a particle size of ≤1mm before the material is completely solidified to enhance the surface's anti-slip and anti-ultraviolet capabilities.

[0057] The thickness of each layer of the layered perfusion in this embodiment does not exceed 3 mm, and the interval between adjacent layers is ≤ 5 minutes.

[0058] The caulking material of this embodiment is suitable for repairing road cracks with a width of ≥3mm, and traffic can be opened within 24 hours after caulking.

[0059] Example 4: In this example, an environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) includes the following components by weight percentage: Recycled asphalt (RAP) granules: 42%; New asphalt: 22%; Regeneration agent: 6%; Toughening fiber: 2%; Mineral fillers: 58%; Anti-aging agent: 0.6%.

[0060] The RAP particles of this embodiment have a particle size of 0.5 mm and are preheated at 125° C. to remove moisture and impurities; The regeneration agent is a mixture of aromatic oil and asphalt activator, wherein the aromatic oil accounts for 65% and the activator is a sulfide or organic amine compound; The toughening fiber is polyester fiber or basalt fiber, and has a length of 4 mm; The mineral filler is limestone powder or Portland cement, with a fineness of ≥200 mesh; The anti-aging agent is a hindered amine light stabilizer (HALS) or carbon black, which is used to improve the material's resistance to ultraviolet rays and oxidative aging.

[0061] The basalt fiber of this embodiment is also pretreated, and the specific pretreatment method is as follows: The basalt fiber is stirred evenly in a sodium silicate solution 4 times the total amount of the fiber, and then an additive of 22% of the total amount of the basalt fiber is added to the basalt fiber, and ultrasonic treatment is completed.

[0062] The mass fraction of the sodium silicate solution in this embodiment is 6%; the ultrasonic treatment is performed at an ultrasonic power of 360 W and for 1 hour.

[0063] The preparation method of the additive of this embodiment is: 3 parts of lanthanum oxide and 2 parts of barium zirconate are added to 6 parts of sodium lignin sulfonate solution, and then 4 parts of boron nitride are added, stirred evenly, and then filtered and dried to obtain an additive.

[0064] The mass fraction of the sodium lignosulfonate solution in this embodiment is 6%.

[0065] The present embodiment provides a method for preparing an environmentally friendly asphalt concrete crack filling material based on recycled asphalt mixture (RAP), comprising the following steps: The RAP particles were crushed and sieved to the target particle size and heated to 125°C for pretreatment; Mixing new asphalt with regeneration agent at 165°C to form composite asphalt binder; Add the pretreated RAP particles, mineral filler, toughening fiber and anti-aging agent in sequence and stir at 155°C for 25 minutes; The temperature is lowered to 88°C to obtain a pumpable caulking material.

[0066] A method for constructing a caulking material according to this embodiment includes the following steps: Crack pretreatment: Use high-pressure air or a mechanical brush to remove loose particles in the cracks to ensure that the cracks are clean and dry; Material grouting: Use grouting equipment to pump the grouting material into the cracks at a temperature of 85°C, and grout it layer by layer until dense; Surface treatment: After pouring, sprinkle fine sand or rubber particles with a particle size of ≤1mm before the material is completely solidified to enhance the surface's anti-slip and anti-ultraviolet capabilities.

[0067] The thickness of each layer of the layered perfusion in this embodiment does not exceed 3 mm, and the interval between adjacent layers is ≤ 5 minutes.

[0068] The caulking material of this embodiment is suitable for repairing road cracks with a width of ≥3mm, and traffic can be opened within 24 hours after caulking.

[0069] Example 5: In this example, an environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) includes the following components by weight percentage: Recycled asphalt (RAP) granules: 55%; New asphalt: 28%; Regeneration agent: 8%; Toughening fiber: 2%; Mineral fillers: 12%; Anti-aging agent: 0.8%.

[0070] The RAP particles of this embodiment have a particle size of 1.6 mm and are preheated at 135° C. to remove moisture and impurities; The regeneration agent is a mixture of aromatic oil and asphalt activator, wherein the aromatic oil accounts for 75% and the activator is a sulfide or organic amine compound; The toughening fiber is polyester fiber or basalt fiber, and has a length of 5 mm; The mineral filler is limestone powder or Portland cement, with a fineness of ≥200 mesh; The anti-aging agent is a hindered amine light stabilizer (HALS) or carbon black, which is used to improve the material's resistance to ultraviolet rays and oxidative aging.

[0071] The basalt fiber of this embodiment is also pretreated, and the specific pretreatment method is as follows: The basalt fiber is stirred evenly in a sodium silicate solution 4 times the total amount of the fiber, and then an additive of 28% of the total amount of the basalt fiber is added to the basalt fiber, and ultrasonic treatment is completed.

[0072] The mass fraction of the sodium silicate solution in this embodiment is 7%; the ultrasonic treatment power is 386 W, and the ultrasonic treatment is performed for 1 hour.

[0073] The preparation method of the additive of this embodiment is: 3 parts of lanthanum oxide and 2 parts of barium zirconate are added to 7 parts of sodium lignin sulfonate solution, and then 4 parts of boron nitride are added, stirred evenly, and then filtered and dried to obtain an additive.

[0074] The mass fraction of the sodium lignosulfonate solution in this embodiment is 5-8%.

[0075] The present embodiment provides a method for preparing an environmentally friendly asphalt concrete crack filling material based on recycled asphalt mixture (RAP), comprising the following steps: The RAP particles were crushed and sieved to the target particle size and heated to 135°C for pretreatment; Mixing new asphalt with regeneration agent at 168°C to form composite asphalt binder; The pretreated RAP particles, mineral fillers, toughening fibers, and anti-aging agents were added in sequence and stirred at 156°C for 28 minutes; The temperature is lowered to 95°C to obtain a pumpable caulking material.

[0076] A method for constructing a caulking material according to this embodiment includes the following steps: Crack pretreatment: Use high-pressure air or a mechanical brush to remove loose particles in the cracks to ensure that the cracks are clean and dry; Material grouting: Use grouting equipment to pump the grouting material into the cracks at a temperature of 95°C, and grout it layer by layer until dense; Surface treatment: After pouring, sprinkle fine sand or rubber particles with a particle size of ≤1mm before the material is completely solidified to enhance the surface's anti-slip and anti-ultraviolet capabilities.

[0077] The thickness of each layer of the layered perfusion in this embodiment does not exceed 3 mm, and the interval between adjacent layers is ≤ 5 minutes.

[0078] The caulking material of this embodiment is suitable for repairing road cracks with a width of ≥3mm, and traffic can be opened within 24 hours after caulking.

[0079] Comparative Example 1: In this comparative example, the same points as Example 3 are not repeated here, and the differences are as follows: No additives were added during the pretreatment of basalt fibers.

[0080] Comparative Example 2: In this comparative example, the same points as Example 1 are not repeated here, and the differences are as follows: Barium zirconate and boron nitride are not added to the additives.

[0081]

[0082] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP), characterized by: The following components are included by weight percentage: Recycled asphalt mixture (RAP) particles: 40% to 60%; New asphalt: 20% to 30%; Regeneration agent: 5% to 10%; Toughening fiber: 1% to 3%; Mineral filler: 5% to 15%; Anti-aging agent: 0.5%~1%.

2. The environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) according to claim 1 is characterized by: The RAP particles have a particle size of 0.1 to 2 mm and are preheated at 120°C to 140°C to remove moisture and impurities; The regeneration agent is a mixture of aromatic oil and asphalt activator, wherein the aromatic oil accounts for 60% to 80% and the activator is a sulfide or organic amine compound; The toughening fiber is polyester fiber or basalt fiber, and has a length of 3 to 6 mm; The mineral filler is limestone powder or Portland cement, with a fineness of ≥200 mesh; The anti-aging agent is a hindered amine light stabilizer (HALS) or carbon black, which is used to improve the material's resistance to ultraviolet rays and oxidative aging.

3. The environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) according to claim 2 is characterized by: The basalt fiber is also pretreated, and the specific pretreatment method is as follows: The basalt fiber is stirred evenly in a sodium silicate solution with a volume of 3-5 times the total volume of the fiber, and then an additive with a volume of 20-30% of the total volume of the basalt fiber is added to the basalt fiber, and ultrasonic treatment is performed until the treatment is completed.

4. The environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) according to claim 3 is characterized by: The mass fraction of the sodium silicate solution is 5-8%; the ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment is performed for 1 hour.

5. The environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) according to claim 3 is characterized by: The preparation method of the additive is: 2-4 parts of lanthanum oxide and 1-3 parts of barium zirconate are added to 5-8 parts of sodium lignin sulfonate solution, and then 3-5 parts of boron nitride are added, stirred evenly, filtered, and dried to obtain an additive.

6. The environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) according to claim 5, characterized in that: The mass fraction of the sodium lignin sulfonate solution is 5-8%.

7. The method for preparing an environmentally friendly asphalt concrete caulking material based on recycled asphalt mixture (RAP) according to any one of claims 1 to 6, characterized in that: The following steps are involved: The RAP particles are crushed and sieved to the target particle size and heated to 120°C to 140°C for pretreatment; Mix the new asphalt and the regeneration agent at 160℃~170℃ to form a composite asphalt binder; Add the pretreated RAP particles, mineral filler, toughening fiber and anti-aging agent in sequence, and stir at 150℃~160℃ for 20~30 minutes; The temperature is lowered to 80°C to 100°C to obtain a pumpable caulking material.

8. A construction method based on any one of claims 1 to 6 of the caulking material, characterized in that: The following steps are involved: Crack pretreatment: Use high-pressure air or a mechanical brush to remove loose particles in the cracks to ensure that the cracks are clean and dry; Material grouting: Use grouting equipment to pump the grouting material into the cracks at a temperature of 80°C to 100°C, and grout in layers until dense; Surface treatment: After pouring, sprinkle fine sand or rubber particles with a particle size of ≤1mm before the material is completely solidified to enhance the surface's anti-slip and anti-ultraviolet capabilities.

9. The construction method according to claim 8, characterized in that: The thickness of each layer of the layered perfusion does not exceed 3 mm, and the interval between adjacent layers is ≤ 5 minutes.

10. The construction method according to claim 8, characterized in that: The caulking material is suitable for repairing road cracks with a width of ≥3mm, and traffic can be opened within 24 hours after caulking.

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