Asphalt cold-mixing repairing composite material and preparation method thereof

Abstract

The invention provides an asphalt cold-mixing repair composite material and a preparation method thereof, and the preparation method comprises the following steps: preparing modified asphalt, preparing modified zeolite powder and mixing. The step of preparing the modified zeolite powder comprises primary modification and secondary modification; the secondary modification step comprises the following steps: mixing preliminarily modified zeolite powder with deionized water, hexadecyl trimethyl ammonium chloride and ethyl cellulose, carrying out primary ball milling treatment, controlling the ball-to-material ratio to be (4-8): 1, the ball milling rotating speed to be 245-255 rpm, the ball milling temperature to be 83-85 DEG C and the ball milling time to be 24-26 min, adding xylitol and 3-mercapto-1-propylamine after the primary ball milling is finished, and carrying out secondary ball milling treatment to obtain a modified zeolite powder; carrying out secondary ball-milling treatment, controlling the ball-milling temperature to be 68-72 DEG C, the ball-to-material ratio to be (10-14): 1, the ball-milling rotating speed to be 184-196rpm and the ball-milling time to be 30-38min, and after the secondary ball-milling treatment is finished, drying to obtain modified zeolite powder; the composite material prepared by the method disclosed by the invention is less in weight loss in a low-temperature and salt environment, the strength performance and water resistance of a repaired pavement are strong, and the strength performance retention rate in the low-temperature and salt environment is high.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt repair materials, and in particular relates to an asphalt cold-mix repair composite material and a preparation method thereof. Background Art

[0002] Asphalt pavement is the most widely used high-grade pavement in road construction. Asphalt binder improves the ability of paving aggregate to resist damage to the road surface caused by traffic and natural factors, making the road surface smooth, dust-free, impermeable and durable. However, with the increasing heavy load and substantial increase in traffic volume, asphalt pavement will suffer from cracks, potholes, rutting and other defects, which seriously affect driving comfort. Therefore, it is of great research significance to strengthen the maintenance and repair technology of asphalt pavement and extend the service life of asphalt pavement.

[0003] At present, hot-mix asphalt mixture is the mainstream material for repairing damaged asphalt pavement. However, when hot-mix asphalt mixture is used to repair pavement, the temperature drops quickly, it is difficult to mix and form, and rapid repair cannot be achieved. Moreover, hot-mix asphalt mixture needs to be heated before use. During the construction process, it not only consumes a lot of energy, is time-consuming and labor-intensive, but also pollutes the environment.

[0004] In order to overcome the defects of hot-mix asphalt mixture, cold-mix asphalt mixture has been widely promoted and applied in the market in recent years. Cold-mix asphalt mixture can be mixed and constructed at room temperature to reduce energy consumption, but it loses a lot of weight after being soaked in low temperature and salt water, and the repaired road surface has low strength and poor water resistance. The strength performance is unstable in low temperature and salt environment. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the present invention provides an asphalt cold-mix repair composite material and a preparation method thereof, which can reduce weight loss in low temperature and salt environments, improve the strength performance and water resistance of the repaired road surface, and improve the strength performance retention rate in low temperature and salt environments.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A method for preparing a cold-mix asphalt repair composite material comprises the following steps: 1. Preparation of modified asphalt The base asphalt is heated to 151-155°C, and then the modified rubber is added, stirred for 18-22 minutes, and then filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water are added, and ball milling is performed. The ball milling time is 35-39 minutes, the ball-to-material ratio is 4-8:1, and the ball milling speed is 220-240rpm. After the ball milling is completed, the modified asphalt is dried; The mass ratio of the matrix asphalt, modified rubber, filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water is 68-72:47-53:4-6:1.5-1.7:1.1-1.3:28-32; The preparation method of the modified rubber comprises the following steps: soaking the styrene-butadiene block copolymer in a sodium hydroxide solution for 38-42 minutes, washing and drying the styrene-butadiene block copolymer, placing the styrene-butadiene block copolymer in a closed environment for closed treatment, controlling the temperature to 84-86° C., introducing nitrogen, maintaining the pressure to 3.1-3.3 MPa, adding deionized water and vinyl trimethoxysilane, stirring evenly, adding carboxymethyl cellulose, continuing stirring for 34-36 minutes, and drying the styrene-butadiene block copolymer to obtain the modified rubber. The styrene-butadiene block copolymer has a particle size of 115-125 nm; The mass concentration of the sodium hydroxide solution is 14-18%; The mass ratio of the styrene-butadiene block copolymer to the sodium hydroxide solution is 1:3.2-3.6; The mass ratio of the styrene-butadiene block copolymer, deionized water, vinyl trimethoxy silane and carboxymethyl cellulose is 25-27:68-72:0.4-0.6:1.0-1.4; The preparation method of the filler is as follows: alumina and calcium carbonate are mixed evenly, and then deionized water, sodium alginate and glycerol are added for ball milling, the ball-to-material ratio is 6-10:1, the ball milling speed is 115-125 rpm, the ball milling time is 36-44 min, the ball milling temperature is 10-14° C. After the ball milling is completed, the filler is dried to obtain the filler; The aluminum oxide has a density of 3.6-3.8 g / cm 3 , particle size is 78-82nm; The calcium carbonate has a particle size of 74-76 nm; The mass ratio of the aluminum oxide, calcium carbonate, deionized water, sodium alginate and glycerol is 11-13:9-11:74-78:1.0-1.4:1.5-1.9.

[0007] 2. Preparation of modified zeolite powder (1) Preliminary modification The zeolite powder is placed in a muffle furnace and roasted for 1.1-1.3 hours at a roasting temperature of 354-366° C. After the roasting, the zeolite powder is soaked in a sodium hydroxide solution for 38-42 minutes, and then dried to obtain a preliminary modified zeolite powder; The zeolite powder has a density of 2.55-2.57 g / cm 3 , particle size is 106-114nm; The mass concentration of the sodium hydroxide solution is 30-34%; The mass ratio of the zeolite powder to the sodium hydroxide solution is 1:2.7-2.9; (2) Secondary modification The preliminary modified zeolite powder is mixed with deionized water, hexadecyltrimethylammonium chloride and ethyl cellulose, and the first ball milling treatment is carried out, the ball-to-material ratio is controlled to be 4-8:1, the ball milling speed is 245-255rpm, the ball milling temperature is 83-85°C, and the ball milling time is 24-26min. After the first ball milling, xylitol and 3-mercapto-1-propylamine are added, and the second ball milling treatment is carried out, the ball milling temperature is controlled to be 68-72°C, the ball-to-material ratio is 10-14:1, the ball milling speed is 184-196rpm, and the ball milling time is 30-38min. After the second ball milling treatment, drying is carried out to obtain the modified zeolite powder; The mass ratio of the zeolite powder, deionized water, hexadecyltrimethylammonium chloride, ethyl cellulose, xylitol and 3-mercapto-1-propylamine is 24-26:120-140:2.0-2.2:2.5-2.7:2.3-2.7:3.5-3.9.

[0008] 3. Mix Put the modified asphalt in dichloromethane, add benzoin dimethyl ether and modified zeolite powder, stir evenly, and then perform ultraviolet-ultrasonic treatment, control the central wavelength of the ultraviolet lamp to 310-330nm, the power of the ultraviolet lamp to 254-266W, the ultrasonic power to 452-468W, and the ultraviolet-ultrasonic treatment time to 54-62min. After the treatment, wash and dry to obtain a primary mixture, then add epoxy resin, diesel, epoxy soybean oil and dibutyl phthalate, stir for 6-10min, add limestone, and stir evenly to obtain an asphalt cold-mix repair composite material; The mass volume ratio of the modified asphalt, dichloromethane, benzoin dimethyl ether and modified zeolite powder is 2.5-2.9 g: 490-510 mL: 0.06-0.08 g: 2.7-2.9 g; The mass ratio of the primary mixture, epoxy resin, diesel, epoxy soybean oil, dibutyl phthalate and limestone is 60-65:8.3-8.7:2.0-2.4:2.7-3.2:3.2-3.5:995-1010.

[0009] A cold-mix asphalt repair composite material is prepared by the above-mentioned preparation method.

[0010] Compared with the prior art, the present invention achieves the following beneficial effects: 1. The present invention adopts a specific method to prepare modified asphalt, improves the bonding ability between rubber and asphalt, avoids agglomeration, and enhances the dispersion ability. It is combined with specific modified composite powder and modified epoxy resin and other components to make the components evenly distributed, thereby improving the uniformity and stability of the internal structure of the asphalt cold-mix repair composite material, enhancing the strength performance of the composite material, and reducing its loss in low temperature and salt environment; 2. The asphalt cold-mix repair composite material prepared by the present invention was placed at -40°C for 30 days, and the weight loss rate was 0.08-0.11%. It was immersed in a sodium chloride solution with a mass concentration of 40% for 40 days, and the weight loss rate was 0.14-0.18%; 3. The asphalt cold-mix repair composite material prepared by the present invention has a Marshall stability of 63.3-65.8 KN at 60°C and a water-immersion Marshall residual stability of 94.8-96.7%; 3. The asphalt cold-mix repair composite material prepared by the present invention has a flexural tensile strength of 18.5-20.4 MPa, a flexural stiffness modulus of 4310-4356 MPa, and a maximum flexural tensile strain of 3962-3996 με at 15°C; After standing at -40℃ for 30 days, the flexural tensile strength is 17.8-19.9MPa, the flexural stiffness modulus is 4146-4257MPa, and the maximum flexural strain is 3800-3868με; After being immersed in a sodium chloride solution with a mass concentration of 40% for 40 days, the flexural strength is 17.6-19.7MPa, the flexural stiffness modulus is 4103-4230MPa, and the maximum flexural strain is 3781-3849με. DETAILED DESCRIPTION

[0011] In order to more clearly understand the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described.

[0012] Example 1 1. Preparation of modified asphalt The base asphalt was heated to 153°C, and then the modified rubber was added and stirred for 20 minutes. Then filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water were added and ball milled. The ball milling time was 37 minutes, the ball-to-material ratio was 6:1, and the ball milling speed was 230 rpm. After the ball milling was completed, the modified asphalt was dried. The mass ratio of the base asphalt, modified rubber, filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water is 70:50:5:1.6:1.2:30; The preparation method of the modified rubber comprises the following steps: soaking the styrene-butadiene block copolymer in a sodium hydroxide solution for 40 minutes, washing and drying the styrene-butadiene block copolymer, placing the styrene-butadiene block copolymer in a closed environment for closed treatment, controlling the temperature to 85° C., introducing nitrogen, maintaining the pressure to 3.2 MPa, adding deionized water and vinyl trimethoxysilane, stirring evenly, adding carboxymethyl cellulose, continuing stirring for 35 minutes, and drying the styrene-butadiene block copolymer to obtain the modified rubber. The styrene-butadiene block copolymer has a particle size of 120 nm; The mass concentration of the sodium hydroxide solution is 16%; The mass ratio of the styrene-butadiene block copolymer to the sodium hydroxide solution is 1:3.4; The mass ratio of the styrene-butadiene block copolymer, deionized water, vinyl trimethoxy silane and carboxymethyl cellulose is 26:70:0.5:1.2; The preparation method of the filler is as follows: alumina and calcium carbonate are mixed evenly, and then deionized water, sodium alginate and glycerol are added for ball milling, the ball-to-material ratio is 8:1, the ball milling speed is 120 rpm, the ball milling time is 40 minutes, the ball milling temperature is 12° C. After the ball milling is completed, the filler is dried to obtain the filler; The aluminum oxide has a density of 3.7 g / cm 3 , particle size is 80nm; The calcium carbonate has a particle size of 75 nm; The mass ratio of the aluminum oxide, calcium carbonate, deionized water, sodium alginate and glycerol is 12:10:76:1.2:1.7.

[0013] 2. Preparation of modified zeolite powder (1) Preliminary modification The zeolite powder was placed in a muffle furnace and calcined for 1.2 hours at a calcination temperature of 360°C. After the calcination, the powder was soaked in a sodium hydroxide solution for 40 minutes. After the soaking, the powder was dried to obtain a preliminary modified zeolite powder. The zeolite powder has a density of 2.56 g / cm 3 , particle size is 110nm; The mass concentration of the sodium hydroxide solution is 32%; The mass ratio of the zeolite powder to the sodium hydroxide solution is 1:2.8; (2) Secondary modification The preliminary modified zeolite powder was mixed with deionized water, hexadecyltrimethylammonium chloride and ethyl cellulose, and the first ball milling treatment was carried out, the ball-to-material ratio was controlled to be 6:1, the ball milling speed was 250 rpm, the ball milling temperature was 84°C, and the ball milling time was 25 min. After the first ball milling, xylitol and 3-mercapto-1-propylamine were added, and the second ball milling treatment was carried out, the ball milling temperature was controlled to be 70°C, the ball-to-material ratio was 12:1, the ball milling speed was 190 rpm, and the ball milling time was 34 min. After the second ball milling treatment, the modified zeolite powder was dried; The mass ratio of the zeolite powder, deionized water, hexadecyltrimethylammonium chloride, ethyl cellulose, xylitol, and 3-mercapto-1-propylamine is 25:130:2.1:2.6:2.5:3.7.

[0014] 3. Mix Put the modified asphalt into dichloromethane, add benzoin dimethyl ether and modified zeolite powder, stir evenly, and then perform ultraviolet-ultrasonic treatment, control the central wavelength of the ultraviolet lamp to 320nm, the power of the ultraviolet lamp to 260W, the ultrasonic power to 460W, and the ultraviolet-ultrasonic treatment time to 60min. After the treatment, wash and dry to obtain a primary mixture, then add epoxy resin, diesel, epoxy soybean oil and dibutyl phthalate, stir for 8min, add limestone, and stir evenly to obtain an asphalt cold-mix repair composite material; The mass ratio of the modified asphalt, dichloromethane, dimethyl benzoate and modified zeolite powder is 2.7g:500mL:0.07g:2.8g; The mass ratio of the primary mixture, epoxy resin, diesel, epoxy soybean oil, dibutyl phthalate and limestone is 62:8.5:2.2:3.0:3.4:1000.

[0015] Example 2 1. Preparation of modified asphalt The base asphalt was heated to 151°C, and then the modified rubber was added and stirred for 18 minutes. Then filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water were added and ball milled. The ball milling time was 35 minutes, the ball-to-material ratio was 4:1, and the ball milling speed was 220 rpm. After the ball milling was completed, the modified asphalt was dried. The mass ratio of the matrix asphalt, modified rubber, filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water is 68:47:4:1.5:1.1:28; The preparation method of the modified rubber comprises the following steps: immersing the styrene-butadiene block copolymer in a sodium hydroxide solution for 38 minutes, washing and drying the styrene-butadiene block copolymer, placing the styrene-butadiene block copolymer in a closed environment for closed treatment, controlling the temperature to 84° C., introducing nitrogen, maintaining the pressure to 3.1 MPa, adding deionized water and vinyl trimethoxysilane, stirring evenly, adding carboxymethyl cellulose, continuing stirring for 34 minutes, and drying the styrene-butadiene block copolymer to obtain the modified rubber. The styrene-butadiene block copolymer has a particle size of 115 nm; The mass concentration of the sodium hydroxide solution is 14%; The mass ratio of the styrene-butadiene block copolymer to the sodium hydroxide solution is 1:3.2; The mass ratio of the styrene-butadiene block copolymer, deionized water, vinyl trimethoxy silane and carboxymethyl cellulose is 25:68:0.4:1.0; The preparation method of the filler is as follows: alumina and calcium carbonate are mixed evenly, and then deionized water, sodium alginate and glycerol are added for ball milling, the ball-to-material ratio is 6:1, the ball milling speed is 115 rpm, the ball milling time is 36 minutes, the ball milling temperature is 10° C. After the ball milling is completed, the filler is dried to obtain the filler; The aluminum oxide has a density of 3.6 g / cm 3 , particle size is 78nm; The calcium carbonate has a particle size of 74 nm; The mass ratio of the aluminum oxide, calcium carbonate, deionized water, sodium alginate and glycerol is 11:9:74:1.0:1.5.

[0016] 2. Preparation of modified zeolite powder (1) Preliminary modification The zeolite powder was placed in a muffle furnace and calcined for 1.1 hours at a calcination temperature of 354°C. After the calcination, the powder was soaked in a sodium hydroxide solution for 38 minutes. After the soaking, the powder was dried to obtain a preliminary modified zeolite powder. The zeolite powder has a density of 2.55 g / cm 3 , particle size is 106nm; The mass concentration of the sodium hydroxide solution is 30%; The mass ratio of the zeolite powder to the sodium hydroxide solution is 1:2.7; (2) Secondary modification The preliminary modified zeolite powder was mixed with deionized water, hexadecyltrimethylammonium chloride and ethyl cellulose, and the first ball milling treatment was carried out, the ball-to-material ratio was controlled to be 4:1, the ball milling speed was 245 rpm, the ball milling temperature was 83°C, and the ball milling time was 24 min. After the first ball milling, xylitol and 3-mercapto-1-propylamine were added, and the second ball milling treatment was carried out, the ball milling temperature was controlled to be 68°C, the ball-to-material ratio was 10:1, the ball milling speed was 184 rpm, and the ball milling time was 30 min. After the second ball milling treatment, the modified zeolite powder was dried; The mass ratio of the zeolite powder, deionized water, hexadecyltrimethylammonium chloride, ethyl cellulose, xylitol, and 3-mercapto-1-propylamine is 24:120:2.0:2.52.3:3.5; 3. Mix Put the modified asphalt into dichloromethane, add benzoin dimethyl ether and modified zeolite powder, stir evenly, and then perform ultraviolet-ultrasonic treatment, control the central wavelength of the ultraviolet lamp to 310nm, the power of the ultraviolet lamp to 254W, the ultrasonic power to 452W, and the ultraviolet-ultrasonic treatment time to 54min. After the treatment, wash and dry to obtain a primary mixture, then add epoxy resin, diesel, epoxy soybean oil and dibutyl phthalate, stir for 6min, add limestone, and stir evenly to obtain an asphalt cold-mix repair composite material; The mass volume ratio of the modified asphalt, dichloromethane, benzoin dimethyl ether and modified zeolite powder is 2.5g:490mL:0.06g:2.7g; The mass ratio of the primary mixture, epoxy resin, diesel, epoxy soybean oil, dibutyl phthalate and limestone is 60:8.3:2.0:2.7:3.2:995.

[0017] Example 3 1. Preparation of modified asphalt The base asphalt was heated to 155°C, and then the modified rubber was added and stirred for 22 minutes. Then filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water were added and ball milled. The ball milling time was 39 minutes, the ball-to-material ratio was 8:1, and the ball milling speed was 240 rpm. After the ball milling was completed, the modified asphalt was dried. The mass ratio of the base asphalt, modified rubber, filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water is 72:53:6:1.7:1.3:32; The preparation method of the modified rubber comprises the following steps: soaking the styrene-butadiene block copolymer in a sodium hydroxide solution for 42 minutes, washing and drying the styrene-butadiene block copolymer, placing the styrene-butadiene block copolymer in a closed environment for closed treatment, controlling the temperature to 86° C., introducing nitrogen, maintaining the pressure to 3.3 MPa, adding deionized water and vinyl trimethoxysilane, stirring evenly, adding carboxymethyl cellulose, continuing stirring for 36 minutes, and drying the styrene-butadiene block copolymer to obtain the modified rubber. The styrene-butadiene block copolymer has a particle size of 125 nm; The mass concentration of the sodium hydroxide solution is 18%; The mass ratio of the styrene-butadiene block copolymer to the sodium hydroxide solution is 1:3.6; The mass ratio of the styrene-butadiene block copolymer, deionized water, vinyl trimethoxy silane and carboxymethyl cellulose is 27:72:0.6:1.4; The preparation method of the filler is as follows: alumina and calcium carbonate are mixed evenly, and then deionized water, sodium alginate and glycerol are added for ball milling, the ball-to-material ratio is 10:1, the ball milling speed is 125 rpm, the ball milling time is 44 minutes, the ball milling temperature is 14°C, and after the ball milling is completed, the filler is dried to obtain the filler; The aluminum oxide has a density of 3.8 g / cm 3 , particle size is 82nm; The calcium carbonate has a particle size of 76 nm; The mass ratio of the aluminum oxide, calcium carbonate, deionized water, sodium alginate and glycerol is 13:11:78:1.4:1.9.

[0018] 2. Preparation of modified zeolite powder (1) Preliminary modification The zeolite powder was placed in a muffle furnace and calcined for 1.3 hours at a calcination temperature of 366°C. After the calcination, the zeolite powder was soaked in a sodium hydroxide solution for 42 minutes. After the soaking, the powder was dried to obtain a preliminary modified zeolite powder. The zeolite powder has a density of 2.57 g / cm 3 , particle size is 114nm; The mass concentration of the sodium hydroxide solution is 34%; The mass ratio of the zeolite powder to the sodium hydroxide solution is 1:2.9; (2) Secondary modification The preliminary modified zeolite powder was mixed with deionized water, hexadecyltrimethylammonium chloride and ethyl cellulose, and the first ball milling treatment was carried out, the ball-to-material ratio was controlled to be 8:1, the ball milling speed was 255 rpm, the ball milling temperature was 85°C, and the ball milling time was 26 min. After the first ball milling, xylitol and 3-mercapto-1-propylamine were added, and the second ball milling treatment was carried out, the ball milling temperature was controlled to be 72°C, the ball-to-material ratio was 14:1, the ball milling speed was 196 rpm, and the ball milling time was 38 min. After the second ball milling treatment, the modified zeolite powder was dried; The mass ratio of the zeolite powder, deionized water, hexadecyltrimethylammonium chloride, ethyl cellulose, xylitol, and 3-mercapto-1-propylamine is 26:140:2.2:2.7:2.7:3.9; 3. Mix Put the modified asphalt into dichloromethane, add benzoin dimethyl ether and modified zeolite powder, stir evenly, and then perform ultraviolet-ultrasonic treatment, control the central wavelength of the ultraviolet lamp to 330nm, the power of the ultraviolet lamp to 266W, the ultrasonic power to 468W, and the ultraviolet-ultrasonic treatment time to 62min. After the treatment, wash and dry to obtain a primary mixture, then add epoxy resin, diesel, epoxy soybean oil and dibutyl phthalate, stir for 10min, add limestone, and stir evenly to obtain an asphalt cold-mix repair composite material; The mass volume ratio of the modified asphalt, dichloromethane, benzoin dimethyl ether and modified zeolite powder is 2.9g:510mL:0.08g:2.9g; The mass ratio of the primary mixture, epoxy resin, diesel, epoxy soybean oil, dibutyl phthalate and limestone is 65:8.7:2.4:3.2:3.5:1010.

[0019] Comparative Example 1 Based on Example 1, the changes are as follows: The modified asphalt is prepared by mixing a base asphalt with a styrene-butadiene block copolymer to obtain the modified asphalt, wherein the mass ratio of the base asphalt to the styrene-butadiene block copolymer is 70:50; The rest of the operations are the same.

[0020] Comparative Example 2 Based on Example 1, the changes are as follows: The preparation step of the modified zeolite powder is omitted. In the mixing step, the modified zeolite powder is replaced by an equal amount of zeolite powder without any treatment; the zeolite powder has a density of 2.56 g / cm 3 , particle size is 110nm; The rest of the operations are the same.

[0021] Performance Testing 1. The asphalt cold-mix repair composite materials prepared in Examples 1-3 and Comparative Examples 1-3 were placed in different environments and their weight loss rates were tested. The results are as follows:

[0022] 2. The asphalt cold-mix repair composite materials prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests according to the method in the Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011). The test results are as follows: (1) Water resistance

[0023] (2) Strength performance

[0024] (3) Low temperature resistance

[0025] (4) Salt resistance

[0026] Unless otherwise specified, all ratios and percentages described in the present invention are by mass ratios and percentages are by mass percentages.

[0027] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a cold-mix asphalt repair composite material, It is characterized in that The preparation method comprises the steps of preparing modified asphalt, preparing modified zeolite powder and mixing; The modified asphalt is prepared by heating the base asphalt to 151-155° C., then adding the modified rubber, stirring for 18-22 minutes, then adding filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water, and performing ball milling. The ball milling time is 35-39 minutes, the ball-to-material ratio is 4-8:1, and the ball milling speed is 220-240 rpm. After the ball milling is completed, the modified asphalt is dried. The preparation method of the modified rubber comprises the following steps: soaking the styrene-butadiene block copolymer in a sodium hydroxide solution for 38-42 minutes, washing and drying the styrene-butadiene block copolymer, placing the styrene-butadiene block copolymer in a closed environment for closed treatment, controlling the temperature to 84-86° C., introducing nitrogen, maintaining the pressure to 3.1-3.3 MPa, adding deionized water and vinyl trimethoxysilane, stirring evenly, adding carboxymethyl cellulose, continuing stirring for 34-36 minutes, and drying the styrene-butadiene block copolymer to obtain the modified rubber. The preparation method of the filler is as follows: alumina and calcium carbonate are mixed evenly, and then deionized water, sodium alginate and glycerol are added for ball milling, the ball-to-material ratio is 6-10:1, the ball milling speed is 115-125 rpm, the ball milling time is 36-44 min, the ball milling temperature is 10-14° C. After the ball milling is completed, the filler is dried to obtain the filler; The preparation of modified zeolite powder includes primary modification and secondary modification; The secondary modification step comprises: mixing the initially modified zeolite powder with deionized water, hexadecyltrimethylammonium chloride and ethyl cellulose, performing a first ball milling treatment, controlling the ball-to-material ratio to be 4-8:1, the ball milling speed to be 245-255 rpm, the ball milling temperature to be 83-85° C., and the ball milling time to be 24-26 min. After the first ball milling, adding xylitol and 3-mercapto-1-propylamine, performing a second ball milling treatment, controlling the ball milling temperature to be 68-72° C., the ball-to-material ratio to be 10-14:1, the ball milling speed to be 184-196 rpm, and the ball milling time to be 30-38 min. After the second ball milling treatment, drying is performed to obtain the modified zeolite powder.

2. The method for preparing the asphalt cold mix repair composite material according to claim 1, It is characterized in that In the step of preparing modified asphalt, the mass ratio of the base asphalt, modified rubber, filler, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and water is 68-72:47-53:4-6:1.5-1.7:1.1-1.3:28-32.

3. The method for preparing the asphalt cold mix repair composite material according to claim 1, It is characterized in that In the preparation method of the modified rubber, the styrene-butadiene block copolymer has a particle size of 115-125 nm; The mass concentration of the sodium hydroxide solution is 14-18%; The mass ratio of the styrene-butadiene block copolymer to the sodium hydroxide solution is 1:3.2-3.6; The mass ratio of the styrene-butadiene block copolymer, deionized water, vinyl trimethoxy silane and carboxymethyl cellulose is 25-27:68-72:0.4-0.6:1.0-1.

4.

4. The method for preparing the asphalt cold mix repair composite material according to claim 1, It is characterized in that In the preparation method of the filler, the aluminum oxide has a density of 3.6-3.8 g / cm 3 , particle size is 78-82nm; The calcium carbonate has a particle size of 74-76 nm; The mass ratio of the aluminum oxide, calcium carbonate, deionized water, sodium alginate and glycerol is 11-13:9-11:74-78:1.0-1.4:1.5-1.

9.

5. The method for preparing the asphalt cold mix repair composite material according to claim 1, It is characterized in that The preliminary modification step is to place the zeolite powder in a muffle furnace and roast it for 1.1-1.3 hours at a roasting temperature of 354-366° C., soak it in a sodium hydroxide solution for 38-42 minutes after the roasting, and dry it after the soaking to obtain the preliminary modified zeolite powder; The zeolite powder has a density of 2.55-2.57 g / cm 3 , particle size is 106-114nm; The mass concentration of the sodium hydroxide solution is 30-34%; The mass ratio of the zeolite powder to the sodium hydroxide solution is 1:2.7-2.

9.

6. The method for preparing the asphalt cold mix repair composite material according to claim 1, It is characterized in that In the secondary modification step, the mass ratio of the zeolite powder, deionized water, hexadecyltrimethylammonium chloride, ethyl cellulose, xylitol, and 3-mercapto-1-propylamine is 24-26:120-140:2.0-2.2:2.5-2.7:2.3-2.7:3.5-3.

9.

7. The method for preparing the asphalt cold mix repair composite material according to claim 1, It is characterized in that The mixing step comprises: placing the modified asphalt in dichloromethane, adding benzoin dimethyl ether and modified zeolite powder, stirring evenly, and then performing ultraviolet-ultrasonic treatment, controlling the central wavelength of the ultraviolet lamp to be 310-330nm, the power of the ultraviolet lamp to be 254-266W, the ultrasonic power to be 452-468W, and the ultraviolet-ultrasonic treatment time to be 54-62min, washing and drying after the treatment to obtain a primary mixture, then adding epoxy resin, diesel, epoxy soybean oil and dibutyl phthalate, stirring for 6-10min, adding limestone, and stirring evenly to obtain an asphalt cold-mix repair composite material.

8. The method for preparing the asphalt cold mix repair composite material according to claim 7, It is characterized in that The mass volume ratio of the modified asphalt, dichloromethane, benzoin dimethyl ether and modified zeolite powder is 2.5-2.9 g: 490-510 mL: 0.06-0.08 g: 2.7-2.9 g; The mass ratio of the primary mixture, epoxy resin, diesel, epoxy soybean oil, dibutyl phthalate and limestone is 60-65:8.3-8.7:2.0-2.4:2.7-3.2:3.2-3.5:995-1010.

9. Asphalt cold mix repair composite material prepared according to any one of the preparation methods of claims 1 to 8.

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