A High-Adhesion Road Crack Repair Material, Its Preparation Method and Application

Abstract

This invention relates to a highly adhesive pavement crack repair material, its preparation method, and its application. It comprises the following raw materials in parts by weight: 1-5 parts adhesive, 70-100 parts base asphalt, 3-7 parts copolymer modifier, 1.5-3 parts cationic emulsifier, 1-3 parts functional water-reducing agent, 1-2 parts defoamer, 2-5 parts pH adjuster, 80-94 parts water, 90-110 parts cement, 70-110 parts sand, 10-20 parts functional filler, and 0.01-0.06 parts expanding agent. This invention first modifies the base asphalt with a copolymer modifier, then combines it with a cationic emulsifier and adhesive to prepare a reactive, highly adhesive pavement crack repair material. After complete curing, this repair material forms a polymer cross-linked network, exhibiting weak relaxation behavior. The flexibility of the cross-linked network and its high adhesion to the crack wall endow the reactive repair material with superior anti-interlocking performance and low-temperature tensile properties, effectively solving the problems of insufficient interfacial adhesion and easy cracking in traditional pavement repair materials.

Description

Technical Field

[0001] This invention relates to a highly adhesive pavement crack repair material, its preparation method and application, belonging to the field of asphalt pavement maintenance technology. Background Technology

[0002] Among asphalt pavement distresses, cracking is one of the most common, easily occurring, and earliest manifesting problems. The presence of cracks severely affects the long-term performance and service life of asphalt pavements, causing damage almost throughout the entire service life of the pavement and becoming increasingly severe with pavement aging. Cracks are one of the earliest, most common, and most important distresses; when cracks appear, driving safety and comfort are affected. If pavement cracks are not treated promptly, rainwater will seep into the subgrade along the cracks, leading to structural damage to the pavement.

[0003] In asphalt pavement maintenance, crack sealing is a cost-effective method, and its effectiveness largely depends on the performance of the chosen sealing material. Currently, many researchers are dedicated to developing crack sealing materials, including hot-applied asphalt, cold-applied asphalt, and specialized materials. However, these materials face various challenges in practical application. Hot-applied asphalt crack sealing requires expensive specialized equipment, and the environmental pollution caused by its fumes is increasingly concerning. While cold-applied asphalt is easy to apply, it requires frequent application and has a relatively short service life. Specialized materials, although offering excellent performance, are expensive and have strict application requirements, limiting their practical application. Furthermore, these materials generally suffer from deficiencies in adhesion and strength, leading to the pavement potentially cracking again within a year of repair, increasing maintenance and repair costs. Therefore, finding economical, environmentally friendly repair materials with good adhesion and strength has become an important research objective. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a highly adhesive pavement crack repair material, its preparation method, and its application.

[0005] The technical solution of the present invention is as follows:

[0006] A highly adhesive pavement crack repair material comprises the following raw materials in parts by weight: 1-5 parts adhesive, 70-100 parts base asphalt, 3-7 parts copolymer modifier, 1.5-3 parts cationic emulsifier, 1-3 parts functional water-reducing agent, 1-2 parts defoamer, 2-5 parts pH adjuster, 80-94 parts water, 90-110 parts cement, 70-110 parts sand, 10-20 parts functional filler, and 0.01-0.06 parts expansion agent.

[0007] According to a preferred embodiment of the present invention, the high-adhesion pavement crack repair material comprises the following raw materials in parts by weight: 3 parts adhesive, 85 parts base asphalt, 5 parts copolymer modifier, 2 parts cationic emulsifier, 1.4 parts defoamer, 3.2 parts pH adjuster, 85 parts water, 100 parts cement, 110 parts sand, 20 parts functional filler, and 0.06 parts expansion agent.

[0008] According to a preferred embodiment of the present invention, the adhesive is a functionalized titanate chelate, prepared according to the following method:

[0009] 10–15 parts of functional group material, 0.1–5 parts of catalyst and 40–80 parts of dehydrating agent are mixed evenly and reacted at 100–150 °C until no water is precipitated to obtain an alcohol ester; then 30–60 parts of alcohol ester and 10–15 parts of titanate are reacted at 30–100 °C for 1–6 h to obtain functionalized titanate; finally, the functionalized titanate is mixed with 50–100 parts of organic solvent and reacted at 80–200 °C for 1–5 h to obtain functionalized titanate chelate.

[0010] More preferably, the functional group material is selected from one or more of diethanolamine, triethanolamine, or dimethylaminoethanol; the catalyst is selected from one or more of aminosulfonic acid, concentrated sulfuric acid, and concentrated nitric acid; the dehydrating agent is selected from one or more of benzene, toluene, and xylene; the titanate is selected from one or more of tetramethyl titanate, tetraethyl titanate, tetraisopropyl titanate, tetrabutyl titanate, tetraisobutyl titanate, and octyl titanate; and the organic solvent is selected from one or more of gasoline, N,N-dimethylformamide, N-methylpyrrolidone, kerosene, cyclohexane, benzene, chloroform, N-ethylpyrrolidone, toluene, or xylene.

[0011] According to a preferred embodiment of the present invention, the copolymer modifier is an amino-functionalized modifier, prepared according to the following method:

[0012] Add 3-8 parts of block copolymer and 0.2-1.5 parts of modifier to 40-80 parts of organic solvent, mix well, then add 0.1-0.5 parts of initiator, and react under ultraviolet light for 1-10 hours. After drying, the amino-functionalized modifier is obtained.

[0013] More preferably, the block copolymer is selected from one or more of styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene-propylene-styrene block copolymer (SEPS), styrene-ethylene-butene-styrene block copolymer (SEBS), styrene-ethylene-propylene copolymer (SEP), styrene-butadiene-styrene copolymer (SBS), and styrene-isoprene-butadiene-styrene copolymer (SIBS); the modifier is a compound containing both amino and thiol groups in its molecular structure, including mercaptoethylamine, mercaptopropylamine, and 4-mercaptoaniline. Or 2-mercaptoaniline, and one or more of their hydrochlorides; the organic solvent is selected from cyclohexane, N-methylpyrrolidone, benzene, toluene, xylenetetrahydrofuran, 1,4-dioxane, dichloromethane, alcohols, chloroform, dichloroethane, N,N-dimethylformamide, dimethyl sulfoxide, N,N-dimethylacetamide; the initiator is selected from dialkoxyacetophenone, triaryl sulfides, benzophenones containing sulfides, diaryl iodonium copper salts, ferrocene salts, benzoin ethers, thioxanthrones, diaryl iodides, anthraquinones, and benzophenones and their derivatives.

[0014] According to a preferred embodiment of the present invention, the cationic emulsifier is selected from one or more of the following: tetradecyltrimethylammonium bromide, trioctylmethylammonium chloride, dodecyltrimethylammonium bromide, dodecyltrimethylammonium bromide, hexadecylpyridine chloride, benzyl chloride, hydroxypropyl guar hydroxypropyltrimethyl chloride, guar hydroxypropyltrimethyl chloride, octadecyl diazoxide quaternary ammonium salt, octadecyl dimethyl benzyl ammonium chloride, hexadecyltrimethylammonium bromide, tetradecyltrimethylammonium chloride, propylene diamine, hexadecyltrimethylammonium chloride, octadecyltrimethylammonium bromide, and octadecyltrimethylammonium chloride.

[0015] According to a preferred embodiment of the present invention, the functional water-reducing agent is a carboxylic acid water-reducing agent containing at least two functional groups: amino, carboxyl, hydroxyl, and amide bonds, and is prepared according to the following method:

[0016] Mix 40-100 parts of polyether monomer and 40-150 parts of deionized water at 20-40℃ and stir for 10-30 minutes. Add 0.1-0.5 parts of initiator and stir for 8-12 minutes. Turn on the peristaltic pump and add component A and component B dropwise simultaneously. The dropwise addition time for component A is 50-150 minutes and the dropwise addition time for component B is 50-200 minutes. After the dropwise addition is complete, continue the reaction for 30-60 minutes. Then adjust the pH value to 6-8. After dialysis and freeze drying, the functional water-reducing agent is obtained.

[0017] Wherein, component A is a solution formed by 2-5 parts of carboxyl monomer, 1-5 parts of amino monomer and 10-20 parts of deionized water, or a solution formed by 2-5 parts of carboxyl monomer, 1-5 parts of hydroxy monomer and 10-20 parts of deionized water; component B is a mixed solution of 0.2-0.6 parts of chain transfer agent and 0.25-0.8 parts of ascorbic acid.

[0018] More preferably, the polyether monomer is selected from one or more of isopentenyl polyethylene glycol ether (TPEG), methyl allyl polyethylene glycol ether (HPEG), and ethylene glycol monovinyl polyethylene glycol ether (EPEG), with a molecular weight of 2000-4000; and the initiator is selected from one or more of hydrogen peroxide, ammonium persulfate, sodium persulfate, and potassium persulfate.

[0019] The carboxyl monomer in material A is selected from one or more of acrylic acid, methacrylic anhydride, maleic anhydride, acrylic anhydride, crotonic anhydride, or methacrylic acid; the amino monomer is selected from one or more of methacrylamide, N-butylacrylamide, N-ethylacrylamide, N-hydroxyacrylamide, N-tert-butylacrylamide, acrylamide, 6'-acrylamide, N-isopropylacrylamide, and N-methyl-2-acrylamide; the hydroxyl monomer is selected from one or more of 2-buten-1-ol, hydroxypropyl acrylate, allyl alcohol, cinnamyl alcohol, citronellol, and 2-methyl-3-butenol.

[0020] The chain transfer agent in material B is selected from one or more of mercaptoethanol, mercaptoacetic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, isopropanol, hypophosphite, sodium hypophosphite, and potassium hypophosphite.

[0021] According to a preferred embodiment of the present invention, the defoamer is selected from one or more of emulsified silicone oil, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene alcohol ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether, and polydimethylsiloxane; the pH adjuster is selected from one or more of 2-amino-2-methyl-propanol, ammonium carbonate, sodium bicarbonate, potassium carbonate, ethanolamine, sodium methoxide, sodium tetraborate, sodium ethoxide, N,N-dimethylethanolamine, ammonia, triisopropanolamine ethanolamine, ammonia, diethanolamine, triethanolamine, and triethylamine; the functional filler is titanium-containing blast furnace slag, red mud, or fly ash with a particle size of less than 0.075 micrometers; the expanding agent is selected from one or more of calcium sulfoaluminate, magnesium sulfate, layered silicates, aluminum powder calcium oxide-calcium sulfoaluminate, magnesium oxide, calcium oxide, strontium oxide, barium oxide, and their mixed oxides.

[0022] The preparation method of the above-mentioned high-adhesion pavement crack repair material includes the following steps:

[0023] (1) Mix water, cationic emulsifier, defoamer and pH adjuster at 50-55°C according to the mass fractions, and adjust the pH to 1-4 at the same time to obtain soap solution;

[0024] (2) Add the copolymer modifier to the base asphalt according to the mass fraction, swell at 140-180℃ for 20-40 min, and then shear at 4000-5000 r / min for 20-40 min to obtain modified asphalt; cool the modified asphalt to 120-130℃, add the soap solution obtained in step (1), mix evenly, and process with an emulsified asphalt colloid mill for 3-5 min to obtain cationic emulsified asphalt; finally, cool the cationic emulsified asphalt to 20-40℃, add the functional water-reducing agent, mix evenly, and obtain component A;

[0025] (3) Mix cement, sand, functional filler and expansion agent evenly according to the mass fraction to obtain component B;

[0026] (4) Mix component A and component B evenly, and add adhesive according to the mass fraction to obtain a highly adhesive pavement crack repair material.

[0027] The application of the above-mentioned high-adhesion pavement crack repair materials in the maintenance and repair of asphalt pavements.

[0028] The technical features and beneficial effects of this invention are as follows:

[0029] 1. This invention first modifies the base asphalt with a copolymer modifier, and then combines it with a cationic emulsifier and an adhesive to prepare a reactive, highly adhesive pavement crack repair material. After complete curing, this repair material can form a polymer cross-linked network, exhibiting weak relaxation behavior. The flexibility of the cross-linked network and its high adhesion to the crack wall endow the reactive repair material with superior anti-interlocking performance and low-temperature tensile properties, effectively solving the problems of insufficient interfacial adhesion and easy cracking of traditional pavement repair materials.

[0030] 2. This invention uses a functional water-reducing agent, which successfully links amino, carboxyl, hydroxyl or amide bonds to the main branch chain of the water-reducing agent molecule, achieving chemical composite at the molecular level of the water-reducing agent. This is superior to water-reducing agents with a single functional group. Its unique structure endows the water-reducing agent with excellent performance, high water reduction rate, and good dispersibility and fluidity at low water-cement ratio and low dosage.

[0031] 3. This invention uses functionalized titanate chelates as an adhesive. After hydrolysis, it forms a water-stable reactive hydroxyl titanium chelate, which can form chemical crosslinks with components containing -OH, NH2, -CONH2, -COOH groups in the repair material system, such as asphalt, emulsifier, functional water-reducing agent, and copolymer modifier. After crosslinking, a stable, highly adhesive gel is formed, which improves the adhesion and adhesion of the repair material to the crack wall.

[0032] 4. This invention provides a road crack repair material with a simple manufacturing process, convenient manufacturing, and room temperature curing capability. Its formula is reasonable. It utilizes the liquid fluidity of modified emulsified asphalt, incorporates fine aggregates and functional fillers, and after curing, forms a new type of highly adhesive asphalt-based repair material. This material can exhibit both the viscoelasticity of asphalt and the rigidity of cement materials. Furthermore, the addition of an adhesive can improve the bonding performance of the material, resulting in good compatibility and adhesion between the repair material and the original road surface.

[0033] 5. The high-adhesion pavement crack repair material provided by this invention effectively utilizes solid waste functional fillers, which not only improves the low-temperature ductility of the repair material and enhances its anti-aging properties, but also significantly reduces the cost of the product. Furthermore, the addition of solid waste fillers broadens the application range of solid waste, increases added value, and reduces environmental pollution. Attached Figure Description

[0034] Figure 1 The following are FT-IR analysis charts of the functionalized water-reducing agents used in Examples 1-3;

[0035] In the figure, a represents Example 1, b represents Example 2, and c represents Example 3.

[0036] Figure 2 SEM images of the high-adhesion road repair materials described in Examples 1-3;

[0037] In the figure, a represents Example 1, b represents Example 2, and c represents Example 3.

[0038] Figure 3 Relaxation curves of high-adhesion pavement repair materials in different embodiments and comparative examples;

[0039] In the figure, a is Comparative Example 7, b is Example 1, and c is Example 4.

[0040] Figure 4 Low-temperature tensile curves of high-adhesion pavement repair materials in different embodiments and comparative examples;

[0041] In the figure, a is Comparative Example 7, b is Example 1, and c is Example 4. Detailed Implementation

[0042] The present invention will be further described below through specific embodiments, but is not limited thereto.

[0043] Unless otherwise specified, the experimental methods described in the examples are conventional methods; the reagents and materials used are commercially available unless otherwise specified.

[0044] Example 1

[0045] A highly adhesive pavement crack repair material comprises the following raw materials in parts by weight: 3 parts functionalized tetraisopropyl titanate chelate, 80 parts base asphalt, 4 parts amino-functionalized styrene-ethylene-propylene-styrene block copolymer, 1.5 parts hexadecylpyridine chloride, 3 parts functionalized water-reducing agent, 1 part polyoxyethylene polyoxypropylene alcohol amine ether, 2 parts ethanolamine, 80 parts water, 100 parts cement, 80 parts sand, 10 parts titanium-containing blast furnace slag, and 0.03 parts expansion agent.

[0046] The functionalized tetraisopropyl titanate chelate was prepared according to the following method:

[0047] 10 parts of diethanolamine, 1 part of aminosulfonic acid, and 50 parts of xylene were mixed evenly and reacted at 130°C until anhydrous precipitation occurred. The xylene was recovered to obtain an alcohol ester. Then, 60 parts of the alcohol ester were mixed evenly with 15 parts of tetraisopropyl titanate and reacted at 60°C for 6 hours to obtain functionalized tetraisopropyl titanate. Finally, the functionalized tetraisopropyl titanate was mixed with 80 parts of N,N-dimethylformamide and reacted at 150°C for 5 hours to obtain a functionalized tetraisopropyl titanate chelate.

[0048] The amino-functionalized styrene-ethylene-propylene-styrene block copolymer was prepared according to the following method:

[0049] Four parts of styrene-ethylene-propylene-styrene block copolymer and 0.8 parts of mercaptoethylamine were added to 40 parts of N-methyl-pyrrolidone and mixed evenly. Then, 0.3 parts of dialkoxyacetophenone were added, and the mixture was reacted under ultraviolet light for 6 hours to obtain amino-grafted styrene-ethylene-propylene-styrene block copolymer. After the reaction was completed, the product was dried to obtain amino-functionalized styrene-ethylene-propylene-styrene block copolymer.

[0050] The functional water-reducing agent is prepared according to the following method:

[0051] 100 parts of methyl allyl polyethylene glycol ether and 150 parts of deionized water were mixed and stirred at 30°C for 30 min. 0.5 parts of ammonium persulfate were added, and the mixture was stirred for 10 min. The peristaltic pump was then turned on, and the prepared components A and B were added dropwise simultaneously. Component A was a solution of 3 parts acrylic acid, 3 parts 2-buten-1-ol, and 15 parts deionized water. Component B was a mixed solution of 0.4 parts 3-mercaptopropionic acid and 0.6 parts ascorbic acid. Component A was added dropwise over 100 min, and component B over 150 min. After the addition was complete, the reaction continued for 50 min. A 15% sodium hydroxide solution was added to adjust the pH to 8. The product was dialyzed through a dialysis bag with a molecular weight cutoff of 8000 for 70 h. After freeze-drying, the functional water-reducing agent powder was obtained.

[0052] The preparation method of the above-mentioned high-adhesion pavement crack repair material includes the following steps:

[0053] (1) Mix water, hexadecylpyridine chloride, polyoxyethylene polyoxypropylene amine ether and ethanolamine at 50°C according to the mass fractions, and adjust the pH to 2.5 at the same time to obtain soap solution;

[0054] (2) According to the mass fraction, the amino-functionalized styrene-ethylene-propylene-styrene block copolymer was added to the base asphalt, swollen at 140℃ for 40 min, and then sheared at 4000 r / min for 20 min to obtain modified asphalt; the modified asphalt was cooled to 130℃, 60 parts of the soap solution obtained in step (1) were added, and after being mixed evenly, it was processed by an emulsified asphalt colloid mill for 5 min to obtain hexadecylpyridine chloride emulsified asphalt; finally, the hexadecylpyridine chloride emulsified asphalt was cooled to 30℃, functional water-reducing agent was added, and mixed evenly to obtain component A;

[0055] (3) Mix cement, sand, titanium-containing blast furnace slag and calcium sulfoaluminate evenly according to the mass fraction to obtain component B;

[0056] (4) Mix component A and component B evenly, and add functionalized tetraisopropyl titanate chelate according to the mass fraction to obtain a highly adhesive pavement crack repair material.

[0057] Example 2

[0058] A highly adhesive pavement crack repair material comprises the following raw materials in parts by weight: 4 parts functionalized tetramethyl titanate chelate, 100 parts base asphalt, 7 parts amino-functionalized styrene-ethylene-butene-styrene block copolymer, 3 parts benzyl chloride, 2.5 parts functionalized water-reducing agent, 2 parts polyoxyethylene polyoxypropylene pentaerythritol ether, 5 parts diethanolamine, 94 parts water, 100 parts cement, 95 parts sand, 14 parts red mud, and 0.04 parts expansion agent.

[0059] The functionalized tetramethyl titanate chelate was prepared according to the following method:

[0060] 15 parts of triethanolamine, 1.5 parts of concentrated sulfuric acid, and 75 parts of toluene were mixed evenly and reacted at 150°C until no water precipitated. Toluene was recovered to obtain an alcohol ester. Then, 40 parts of the alcohol ester were mixed evenly with 10 parts of tetramethyl titanate and reacted at 80°C for 5 hours to obtain functionalized tetramethyl titanate. Finally, the functionalized tetramethyl titanate was mixed with 60 parts of N-methylpyrrolidone and reacted at 180°C for 4 hours to obtain a functionalized tetramethyl titanate chelate.

[0061] The amino-functionalized styrene-ethylene-propylene-styrene block copolymer was prepared according to the following method:

[0062] Eight parts of styrene-ethylene-butene-styrene block copolymer and 1.5 parts of 4-mercaptoaniline were added to 80 parts of xylenetetrahydrofuran and mixed evenly. Then, 0.5 parts of triaryl sulfide were added, and the mixture was reacted under ultraviolet light for 5 hours to obtain amino-grafted styrene-ethylene-butene-styrene block copolymer. After the reaction was completed, the product was dried to obtain amino-functionalized styrene-ethylene-butene-styrene block copolymer.

[0063] The functional water-reducing agent is prepared according to the following method:

[0064] 70 parts of isopentenyl polyethylene glycol ether and 105 parts of deionized water were mixed and stirred at 30°C for 25 min. 0.35 parts of potassium persulfate were added, and the mixture was stirred for 10 min. The peristaltic pump was then turned on, and the prepared components A and B were added dropwise simultaneously. Component A was a solution of 4 parts of methacrylic anhydride, 4 parts of N-tert-butylacrylamide, and 16 parts of deionized water. Component B was a mixed solution of 0.3 parts of sodium hypophosphite and 0.48 parts of ascorbic acid. Component A was added dropwise over 130 min, and component B over 170 min. After the addition was complete, the reaction continued for 45 min. A 25% sodium hydroxide solution was added to adjust the pH to 7.2. The product was dialyzed for 67 h using a dialysis bag with a molecular weight cutoff of 8000. After freeze-drying, the functional water-reducing agent powder was obtained.

[0065] The preparation method of the above-mentioned high-adhesion pavement crack repair material includes the following steps:

[0066] (1) Mix water, benzyl ammonium chloride, polyoxyethylene polyoxypropylene pentaerythritol ether and diethanolamine at 55°C according to the mass fractions, and adjust the pH to 4 at the same time to obtain soap solution.

[0067] (2) According to the mass fraction, the amino-functionalized styrene-ethylene-butene-styrene block copolymer was added to the base asphalt, swollen at 160℃ for 30 min, and then sheared at 4500 r / min for 40 min to obtain modified asphalt; the modified asphalt was cooled to 140℃, 80 parts of the soap solution obtained in step (1) were added, mixed evenly, and then processed by an emulsified asphalt colloid mill for 5 min to obtain benzyl chloride emulsified asphalt; finally, the benzyl chloride emulsified asphalt was cooled to 25℃, and the functional water-reducing agent was added and mixed evenly to obtain component A;

[0068] (3) Mix cement, sand, red mud and magnesium sulfate evenly according to the mass fractions to obtain component B;

[0069] (4) Mix component A and component B evenly, and add functionalized tetramethyl titanate chelate according to the mass fraction to obtain a highly adhesive pavement crack repair material.

[0070] Example 3

[0071] A highly adhesive pavement crack repair material comprises the following raw materials in parts by weight: 3 parts functionalized tetraisobutyl titanate chelate, 85 parts base asphalt, 5 parts amino-functionalized styrene-isoprene-styrene block copolymer, 2 parts hexadecyltrimethylammonium bromide, 2 parts functionalized water-reducing agent, 1.4 parts polydimethylsiloxane, 3.2 parts triisopropanolamine ethanolamine, 85 parts water, 100 parts cement, 110 parts sand, 20 parts red mud, and 0.06 parts expansion agent.

[0072] The functionalized tetraisobutyl titanate chelate was prepared according to the following method:

[0073] 12 parts of dimethylaminoethanol, 1.2 parts of concentrated nitric acid, and 60 parts of benzene were mixed evenly and reacted at 150°C until no water precipitated. Benzene was recovered to obtain an alcohol ester. Then, 50 parts of the alcohol ester were mixed evenly with 12.5 parts of tetraisobutyl titanate and reacted at 80°C for 5 hours to obtain functionalized tetraisobutyl titanate. Finally, the functionalized tetraisobutyl titanate was mixed with 80 parts of N-methylpyrrolidone and reacted at 150°C for 5 hours to obtain a functionalized tetraisobutyl titanate chelate.

[0074] The amino-functionalized styrene-ethylene-propylene-styrene block copolymer was prepared according to the following method:

[0075] Six parts of styrene-isoprene-styrene block copolymer and 1.2 parts of mercaptopropylamine were added to 70 parts of 1,4-dioxane and mixed evenly. Then, 0.4 parts of benzophenone were added, and the mixture was reacted under ultraviolet light for 8 hours to obtain amino-grafted styrene-isoprene-styrene block copolymer. After the reaction was completed, the product was dried to obtain amino-functionalized styrene-isoprene-styrene block copolymer.

[0076] The functional water-reducing agent is prepared according to the following method:

[0077] 40 parts of isopentenyl polyethylene glycol ether and 60 parts of deionized water were mixed and stirred at 40°C for 30 min. 0.2 parts of hydrogen peroxide were added, and the mixture was stirred for 10 min. Then, the peristaltic pump was turned on, and the prepared components A and B were added dropwise simultaneously. Component A was a solution of 5 parts methacrylic anhydride, 5 parts methacrylamide, and 20 parts deionized water, and component B was a mixed solution of 0.6 parts mercaptoethanol and 0.8 parts ascorbic acid. The dropwise addition time for component A was 90 min, and the dropwise addition time for component B was 120 min. After the addition was complete, the reaction continued for 60 min. A 20% sodium hydroxide solution was added to adjust the pH to 6. The product was dialyzed for 65 h using a dialysis bag with a molecular weight cutoff of 8000. After freeze-drying, the functional water-reducing agent powder was obtained.

[0078] The preparation method of the above-mentioned high-adhesion pavement crack repair material includes the following steps:

[0079] (1) Mix water, hexadecyltrimethylammonium bromide, 1.4 parts polydimethylsiloxane and 3.2 parts triisopropanolamine ethanolamine at 55°C according to the mass fractions, and adjust the pH to 3 at the same time to obtain soap solution;

[0080] (2) According to the mass fraction, the amino-functionalized styrene-isoprene-styrene block copolymer was added to the base asphalt, swollen at 175°C for 35 min, and then sheared at 4400 r / min for 25 min to obtain modified asphalt; the modified asphalt was cooled to 140°C, 65 parts of the soap solution obtained in step (1) were added, and after being mixed evenly, it was processed by an emulsified asphalt colloid mill for 5 min to obtain hexadecyltrimethylammonium bromide emulsified asphalt; finally, the hexadecyltrimethylammonium bromide emulsified asphalt was cooled to 35°C, and a functional water-reducing agent was added and mixed evenly to obtain component A;

[0081] (3) Mix cement, sand, red mud and barium oxide evenly according to the mass fractions to obtain component B;

[0082] (4) Mix component A and component B evenly, and add functionalized tetraisobutyl titanate chelate according to the mass fraction to obtain a highly adhesive pavement crack repair material.

[0083] Example 4

[0084] A highly adhesive pavement crack repair material comprises the following raw materials in parts by weight: 5 parts functionalized tetraisopropyl titanate chelate, 80 parts base asphalt, 4 parts amino-functionalized styrene-ethylene-propylene-styrene block copolymer, 1.5 parts hexadecylpyridine chloride, 3 parts functionalized water-reducing agent, 1 part polyoxyethylene polyoxypropylene alcohol amine ether, 2 parts ethanolamine, 80 parts water, 100 parts cement, 80 parts sand, 10 parts titanium-containing blast furnace slag, and 0.03 parts expansion agent.

[0085] The functionalized tetraisopropyl titanate chelate was prepared according to the following method:

[0086] Ten parts of diethanolamine, one part of aminosulfonic acid, and 50 parts of xylene were mixed evenly and reacted at 130°C until no water precipitated. The xylene was then recovered to obtain an alcohol ester. Then, 60 parts of the alcohol ester were mixed evenly with 15 parts of tetraisopropyl titanate and reacted at 60°C for 6 hours to obtain functionalized tetraisopropyl titanate. Finally, the functionalized tetraisopropyl titanate was mixed with 80 parts of N,N-dimethylformamide and reacted at 150°C for 5 hours to obtain a functionalized tetraisopropyl titanate chelate.

[0087] The amino-functionalized styrene-ethylene-propylene-styrene block copolymer was prepared according to the following method:

[0088] Four parts of styrene-ethylene-propylene-styrene block copolymer and 0.8 parts of mercaptoethylamine were added to 40 parts of N-methyl-pyrrolidone and mixed evenly. Then, 0.3 parts of dialkoxyacetophenone were added, and the mixture was reacted under ultraviolet light for 6 hours to obtain amino-grafted styrene-ethylene-propylene-styrene block copolymer. After the reaction was completed, the product was dried to obtain amino-functionalized styrene-ethylene-propylene-styrene block copolymer.

[0089] The functional water-reducing agent is prepared according to the following method:

[0090] 100 parts of methyl allyl polyethylene glycol ether and 150 parts of deionized water were mixed and stirred at 30°C for 30 min. 0.5 parts of ammonium persulfate were added, and the mixture was stirred for 10 min. The peristaltic pump was then turned on, and the prepared components A and B were added dropwise simultaneously. Component A was a solution of 3 parts acrylic acid, 3 parts 2-buten-1-ol, and 15 parts deionized water. Component B was a mixed solution of 0.4 parts 3-mercaptopropionic acid and 0.6 parts ascorbic acid. Component A was added dropwise over 100 min, and component B over 150 min. After the addition was complete, the reaction continued for 50 min. A 15% sodium hydroxide solution was added to adjust the pH to 8. The product was dialyzed through a dialysis bag with a molecular weight cutoff of 8000 for 70 h. After freeze-drying, the functional water-reducing agent powder was obtained.

[0091] The preparation method of the above-mentioned high-adhesion pavement crack repair material includes the following steps:

[0092] (1) Mix water, hexadecylpyridine chloride, polyoxyethylene polyoxypropylene amine ether and ethanolamine at 50°C according to the mass fractions, and adjust the pH to 2.5 at the same time to obtain soap solution;

[0093] (2) According to the mass fraction, the amino-functionalized styrene-ethylene-propylene-styrene block copolymer was added to the base asphalt, swollen at 140℃ for 40 min, and then sheared at 4000 r / min for 20 min to obtain modified asphalt; the modified asphalt was cooled to 130℃, 60 parts of the soap solution obtained in step (1) were added, and after being mixed evenly, it was processed by an emulsified asphalt colloid mill for 5 min to obtain hexadecylpyridine chloride emulsified asphalt; finally, the hexadecylpyridine chloride emulsified asphalt was cooled to 30℃, functional water-reducing agent was added, and mixed evenly to obtain component A;

[0094] (3) Mix cement, sand, titanium-containing blast furnace slag and calcium sulfoaluminate evenly according to the mass fraction to obtain component B;

[0095] (4) Mix component A and component B evenly, and add functionalized tetraisopropyl titanate chelate according to the mass fraction to obtain a highly adhesive pavement crack repair material.

[0096] Comparative Example 1

[0097] A road surface crack repair material, with the specific composition as described in Example 1, except that no copolymer modifier is used, and a styrene-ethylene-propylene-styrene block copolymer is used directly.

[0098] The specific preparation method is as described in Example 1.

[0099] Comparative Example 2

[0100] A road surface crack repair material, with the specific composition as described in Example 2, except that no copolymer modifier is used, and styrene-ethylene-butene-styrene block copolymer is used directly.

[0101] The specific preparation method is as described in Example 2.

[0102] Comparative Example 3

[0103] A road surface crack repair material, with the specific composition as described in Example 3, except that no copolymer modifier is used, and styrene-isoprene-styrene block copolymer is used directly.

[0104] The specific preparation method is as described in Example 3.

[0105] Comparative Example 4

[0106] A road surface crack repair material, with the specific composition as described in Example 1, except that a commercially available polycarboxylate superplasticizer is used instead of the functional superplasticizer prepared in Example 1.

[0107] The specific preparation method is as described in Example 1.

[0108] Comparative Example 5

[0109] A road surface crack repair material, with the specific composition as described in Example 2, except that a commercially available polycarboxylate superplasticizer is used instead of the functional superplasticizer prepared in Example 2.

[0110] The specific preparation method is as described in Example 2.

[0111] Comparative Example 6

[0112] A road surface crack repair material, with the specific composition as described in Example 3, except that a commercially available polycarboxylate superplasticizer is used instead of the functional superplasticizer prepared in Example 3.

[0113] The specific preparation method is as described in Example 3.

[0114] Comparative Example 7

[0115] A road surface crack repair material, with the specific composition as described in Example 1, except that no adhesive functionalized tetraisopropyl titanate chelate is added.

[0116] The specific preparation method is as described in Example 1.

[0117] Experimental Example

[0118] 1. The FT-IR analysis chromatograms of the functionalized water-reducing agents used in Examples 1 to 3 of this invention are as follows: Figure 1 As shown.

[0119] from Figure 1 As can be seen, at 1106cm -1 The peak at 2884 cm⁻¹ represents the stretching vibration of the ether bond COC. -1 The area near the peak represents the stretching vibration of saturated CH bonds; in the infrared structural spectra of Examples 1-3, the C=C double bond disappears, and the peak at 1720 cm⁻¹ is... -1 A C=O stretching vibration peak was generated in carboxylic acids. The peak was observed at 1665 cm⁻¹. -1 At 1465 cm⁻¹, an O=C symmetric stretching absorption peak of the monomer amide group appeared. -1 and 1340cm -1 The bending vibration peaks of methyl and methylene groups are 1101 cm⁻¹, respectively. -1 It is the absorption peak of the diethyl ether bond (COC), and it is at 1249 cm⁻¹. -1 A stretching vibration peak of the ester bond appears nearby, at 961 cm⁻¹. -1 The absorption peak for hydroxyl groups is 840 cm⁻¹. -1 The peak at this location is the out-of-plane bending vibration absorption peak of CH. This indicates that the functionalized water-reducing agent prepared in this invention contains functional groups such as carboxyl, amide, and hydroxyl groups. It successfully links amino, carboxyl, hydroxyl, or amide bonds to the main branch chain of the water-reducing agent molecule, achieving chemical composite at the molecular level. This is superior to water-reducing agents with only one functional group. Its unique structure endows the water-reducing agent with excellent performance, high water reduction rate, and good dispersibility and flowability at low water-cement ratios and low dosages.

[0120] 2. SEM images of the high-adhesion road repair materials described in Examples 1-3 of this invention are as follows: Figure 2 As shown.

[0121] from Figure 2As can be seen, the content of glossy emulsified asphalt is significantly increased, and the overall structure is dense. The cement hydration products are mainly clustered hydration products CSH linked together. This phenomenon is due to the fact that emulsified asphalt is a water-in-oil emulsion in which tiny asphalt droplets are stably dispersed in water. As the emulsified asphalt comes into contact with other substances, the aqueous phase in the emulsified asphalt first contacts the aggregates and cement particles. The aggregates and cement particles are wetted by the aqueous phase in the emulsified asphalt. In the contact area, due to the different charges on the surfaces of the emulsifier and the contact material, the charged emulsifier ions in the aqueous phase are adsorbed on the surface of the contact material. The concentration of the emulsifier decreases due to the adsorption of the contact material, and the emulsifier molecules on the surface of the asphalt particles migrate, which destroys the emulsifier molecular film surrounding the asphalt particles and makes it unstable. Its equilibrium system is disrupted, and the asphalt particles begin to split out from the emulsified asphalt, turning the hydrophilic asphalt particles into oleophilic particles, which are then adsorbed on the surface of the aggregates or cement hydration products and coagulated into a dense film. This effectively solves the problems of insufficient interfacial adhesion and easy cracking of traditional road repair materials.

[0122] 3. The performance indicators of the high-adhesion pavement crack repair materials provided in Examples 1 to 3 of the present invention and the pavement crack repair materials provided in Comparative Examples 1 to 6 are shown in Table 1.

[0123] Table 1

[0124]

[0125]

[0126] The comparison of the 28-day compressive strength and 28-day flexural strength tests in Table 1 shows that, with the addition of a water-reducing agent with multiple functional groups, the compressive and flexural strengths of the repair materials in Examples 1-3 were significantly improved compared to Comparative Examples 4-6. This is because cement and cementitious materials are stably dispersed in granular form with asphalt emulsion in the initial mixing stage, forming a dynamic equilibrium between the particles. Simultaneously, the addition of the multifunctional water-reducing agent imparts better fluidity and dispersion properties to the repair materials. As cement hydration progresses, the environment becomes alkaline and generates heat of hydration, causing the water film on the surface of the asphalt emulsion to rupture, releasing free water and asphalt. This provides the water required for cement hydration, promotes the formation of hydration products in the mortar, and allows them to be embedded and distributed with the asphalt, causing the mortar to gradually solidify and form a continuous phase structure dominated by cement hydration products. This process significantly improves the strength properties of the repair materials.

[0127] As shown in Table 1, comparing the results of the interfacial adhesion test and the molding time test, compared with Comparative Examples 1-3, in Examples 1-3, the addition of modified block copolymers resulted in cross-linking of the monomer particles of the modified block copolymer molecules, forming a stable network structure. Subsequently, the asphalt emulsion was mixed, and the asphalt emulsion molecules were embedded in the network structure composed of modified block copolymers, forming a three-dimensional network structure. This structure can restrict the flowability of the asphalt emulsion and improve the stability and adhesion performance of the repair material. Finally, after the addition of functionalized titanate chelates, the hydrolysis of these chelates forms water-stable reactive hydroxyl titanium chelates, which chemically cross-link with the components containing -OH, NH2, -CONH2, and -COOH groups in the asphalt emulsion, functional water-reducing agent, and copolymer modifier in the repair material system. After cross-linking, a stable, highly adhesive gel is formed, improving the adhesion and bonding of the repair material to the crack wall.

[0128] Compared with Comparative Examples 4-6, the repair materials prepared in Examples 1-3, after incorporating a water-reducing agent containing multiple functional groups, showed a significant improvement in interfacial adhesion and a marked reduction in molding time. This is because the functionalized water-reducing agent molecules can be directionally adsorbed onto the surface of cement particles, causing the cement particles to carry the same charge, forming an electrostatic repulsion effect. This promotes the dispersion of cement particles, the disintegration of the flocculated structure, and the release of some of the encapsulated water. The increased heat of hydration generated by cement hydration leads to rapid demulsification of the asphalt emulsion, resulting in a higher consistency of the repair material and thus improving its interfacial adhesion.

[0129] 4. The road repair materials provided in Examples 1, 4, and Comparative Example 7 were placed in a test mold and cured at 80°C. Then, a stress relaxation test was performed at 65°C. The relaxation curves are shown below. Figure 3 As shown.

[0130] Depend on Figure 3 It can be seen that Examples 1 and 4 exhibited significant relaxation behavior, indicating that under the action of the titanate chelate adhesive, its hydrolysis forms a water-stable reactive hydroxyl titanium chelate, which can undergo chemical cross-linking reactions with hydroxyl, carboxyl, or amino groups present among the components of the repair material, forming a cross-linked polymer gel network in the system. In contrast, Comparative Example 7 did not have a cross-linked network, therefore exhibiting rapid and significant relaxation behavior at that temperature. Compared to Example 1, the relaxation curve of Example 4 is closer to the X-axis, indicating that the repair material obtained in Example 4 has a faster stress relaxation rate, and the increased amount of adhesive results in better relaxation performance.

[0131] 5. The road repair materials provided in Examples 1, 4, and Comparative Example 7 were used for sample preparation. A mold with dimensions of 50mm × 50mm × 15mm, formed by a metal and concrete boundary, was used. The repair material was poured into the mold, and the sample was cooled at room temperature for at least 2 hours. It was then trimmed using a hot scraper to form a tensile sample. A multi-functional hydraulic servo dynamic testing machine was used in the experiment. The sample was kept at -10℃ for 5 hours before tensile testing. The experimental analysis was performed by observing the relationship between the failure displacement of the sample and the test force. The low-temperature tensile curve is shown below. Figure 4 As shown.

[0132] Depend on Figure 4 It can be seen that, compared with Comparative Example 7, Examples 1 and 4 have significantly lower moduli but larger failure displacements. In Example 1, the lower content of adhesive increases the flexibility of the system and reduces the crosslinking density, resulting in a larger low-temperature tensile displacement and thus giving the system higher flexibility. Example 4, due to its higher adhesive content, forms a dense crosslinked aggregate network, thus exhibiting higher rigidity, a relatively lower failure displacement, and a higher Young's modulus. By comparing the low-temperature tensile curves of different repair materials, it was found that, compared with the traditional repair material of Comparative Example 7, the reactive repair materials of Examples 1 and 4 have larger failure displacements. This is because Comparative Example 7 is a physical crosslinking system formed by polymer elastomers in an asphalt matrix, lacking reactivity, and its components are all non-polar components, resulting in weak adhesion to the contact surface of the test block; while the reactive repair materials of Examples 1 and 4, through in-situ reaction and curing, can form chemical bonds with the active groups on the repair contact surface in addition to polar interactions during the curing process, thereby significantly improving the adhesion performance. Therefore, under low-temperature tensile conditions, debonding failure is not likely to occur, exhibiting a larger failure displacement.

[0133] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention. Furthermore, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. In addition, various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the spirit of the present invention, they should also be considered as the content disclosed by the present invention.

Claims

1. A highly adhesive pavement crack repair material, characterized in that, The raw materials include the following parts by weight: 1-5 parts adhesive, 70-100 parts base asphalt, 3-7 parts copolymer modifier, 1.5-3 parts cationic emulsifier, 1-3 parts functional water-reducing agent, 1-2 parts defoamer, 2-5 parts pH adjuster, 80-94 parts water, 90-110 parts cement, 70-110 parts sand, 10-20 parts functional filler, and 0.01-0.06 parts expanding agent; The adhesive is a functionalized titanate chelate, prepared according to the following method: 10-15 parts of functional group material, 0.1-5 parts of catalyst and 40-80 parts of dehydrating agent are mixed evenly and reacted at 100-150℃ until anhydrous precipitation occurs to obtain an alcohol ester; then 30-60 parts of alcohol ester and 10-15 parts of titanate are reacted at 30-100℃ for 1-6 hours to obtain functionalized titanate; finally, the functionalized titanate is mixed with 50-100 parts of organic solvent and reacted at 80-200℃ for 1-5 hours to obtain functionalized titanate chelate. The functional group material is selected from one or more of diethanolamine, triethanolamine, or dimethylaminoethanol; the catalyst is selected from one or more of aminosulfonic acid, concentrated sulfuric acid, and concentrated nitric acid; the dehydrating agent is selected from one or more of benzene, toluene, and xylene; the titanate is selected from one or more of tetramethyl titanate, tetraethyl titanate, tetraisopropyl titanate, tetrabutyl titanate, tetraisobutyl titanate, and octyl titanate; the organic solvent is selected from one or more of gasoline, N,N-dimethylformamide, N-methylpyrrolidone, kerosene, cyclohexane, benzene, chloroform, N-ethylpyrrolidone, toluene, or xylene. The copolymer modifier is an amino-functionalized modifier, prepared according to the following method: Add 3-8 parts of block copolymer and 0.2-1.5 parts of modifier to 40-80 parts of organic solvent, mix evenly, then add 0.1-0.5 parts of initiator, and react under ultraviolet light for 1-10 hours. After drying, the amino-functionalized modifier is obtained. The block copolymer is selected from one or more of styrene-isoprene-styrene block copolymers, styrene-ethylene-propylene-styrene block copolymers, styrene-ethylene-butene-styrene block copolymers, styrene-ethylene-propylene copolymers, styrene-butadiene-styrene copolymers, and styrene-isoprene-butadiene-styrene copolymers; the modifier is a compound containing both amino and thiol groups in its molecular structure, selected from mercaptoethylamine, mercaptopropylamine, 4-mercaptoaniline, 2-mercaptoaniline, and their hydrochlorides. One or more of the following: the organic solvent is selected from cyclohexane, N-methylpyrrolidone, benzene, toluene, xylenetetrahydrofuran, 1,4-dioxane, dichloromethane, alcohol, chloroform, dichloroethane, N,N-dimethylformamide, dimethyl sulfoxide, N,N-dimethylacetamide; the initiator is selected from dialkoxyacetophenone, triaryl sulfides, benzophenone, sulfide-containing benzophenone, diaryl iodonium copper salt, ferrocene salt, benzoyl ether, thioxanthone, diaryl iodide, anthraquinone, and benzophenone and their derivatives. The functional water-reducing agent is a carboxylic acid water-reducing agent containing at least two functional groups: amino, carboxyl, hydroxyl, and amide bonds, and is prepared according to the following method: Mix 40-100 parts of polyether monomer and 40-150 parts of deionized water at 20-40℃ and stir for 10-30 minutes. Add 0.1-0.5 parts of initiator and stir for 8-12 minutes. Turn on the peristaltic pump and add component A and component B dropwise simultaneously. The dropwise addition time for component A is 50-150 minutes and the dropwise addition time for component B is 50-200 minutes. After the dropwise addition is complete, continue the reaction for 30-60 minutes. Then adjust the pH value to 6-8. After dialysis and freeze drying, the functional water-reducing agent is obtained. Wherein, component A is a solution formed by 2-5 parts of carboxyl monomer, 1-5 parts of amino monomer and 10-20 parts of deionized water, or a solution formed by 2-5 parts of carboxyl monomer, 1-5 parts of hydroxy monomer and 10-20 parts of deionized water; component B is a mixed solution of 0.2-0.6 parts of chain transfer agent and 0.25-0.8 parts of ascorbic acid.

2. The high-adhesion pavement crack repair material as described in claim 1, characterized in that, The high-adhesion pavement crack repair material comprises the following raw materials in parts by weight: 3 parts adhesive, 85 parts base asphalt, 5 parts copolymer modifier, 2 parts cationic emulsifier, 2 parts functional water-reducing agent, 1.4 parts defoamer, 3.2 parts pH adjuster, 85 parts water, 100 parts cement, 110 parts sand, 20 parts functional filler, and 0.06 parts expansion agent.

3. The high-adhesion pavement crack repair material as described in claim 1, characterized in that, The cationic emulsifier is selected from one or more of tetradecyltrimethylammonium bromide, trioctylmethylammonium chloride, dodecyltrimethylammonium bromide, dodecyltrimethylammonium bromide, hexadecylpyridine chloride, benzyl chloride, octadecyl diazoxide quaternary ammonium salt, octadecyl dimethyl benzyl ammonium chloride, hexadecyltrimethylammonium bromide, tetradecyltrimethylammonium chloride, propylene diamine, hexadecyltrimethylammonium chloride, octadecyltrimethylammonium bromide, and octadecyltrimethylammonium chloride.

4. The high-adhesion pavement crack repair material as described in claim 1, characterized in that, The polyether monomer is selected from one or more of isopentenyl polyethylene glycol ether, methyl allyl polyethylene glycol ether, and ethylene glycol monovinyl polyethylene glycol ether, and its molecular weight is 2000-4000; the initiator is selected from one or more of hydrogen peroxide, ammonium persulfate, sodium persulfate, and potassium persulfate. The carboxyl monomer in material A is selected from one or more of acrylic acid, methacrylic anhydride, maleic anhydride, acrylic anhydride, crotonic anhydride, or methacrylic acid; the amino monomer is selected from one or more of methacrylamide, N-butylacrylamide, N-ethylacrylamide, N-hydroxyacrylamide, N-tert-butylacrylamide, acrylamide, 6'-acrylamide, N-isopropylacrylamide, and N-methyl-2-acrylamide; the hydroxyl monomer is selected from one or more of 2-buten-1-ol, hydroxypropyl acrylate, allyl alcohol, cinnamyl alcohol, citronellol, and 2-methyl-3-butenol. The chain transfer agent in material B is selected from one or more of mercaptoethanol, mercaptoacetic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, isopropanol, hypophosphite, sodium hypophosphite, and potassium hypophosphite.

5. The high-adhesion pavement crack repair material as described in claim 1, characterized in that, The defoamer is selected from one or more of emulsified silicone oil, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene alcohol amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether, and polydimethylsiloxane; the pH adjuster is selected from one or more of 2-amino-2-methylpropanol, ammonium carbonate, sodium bicarbonate, potassium carbonate, ethanolamine, sodium methoxide, sodium tetraborate, sodium ethoxide, N,N-dimethylethanolamine, ammonia, triisopropanolamine, ammonia, diethanolamine, triethanolamine, and triethylamine; the functional filler is titanium-containing blast furnace slag, red mud, or fly ash with a particle size of less than 0.075 micrometers; the expanding agent is selected from one or more of calcium sulfoaluminate, magnesium sulfate, layered silicates, aluminum powder, magnesium oxide, calcium oxide, strontium oxide, and barium oxide.

6. The method for preparing the high-adhesion pavement crack repair material according to claim 1, characterized in that, The steps include the following: (1) Mix water, cationic emulsifier, defoamer and pH adjuster at 50~55℃ according to the mass fraction, and adjust the pH to 1~4 at the same time to obtain soap solution; (2) Add the copolymer modifier to the base asphalt according to the mass fraction, swell at 140~180℃ for 20~40min, and then shear at 4000~5000r / min for 20~40min to obtain the modified asphalt; The modified asphalt was cooled to 120~130℃, and the soap solution obtained in step (1) was added. After mixing evenly, it was processed by an emulsified asphalt colloid mill for 3~5 minutes to obtain cationic emulsified asphalt. Finally, the cationic emulsified asphalt was cooled to 20~40℃, and the functional water-reducing agent was added. After mixing evenly, component A was obtained. (3) Mix cement, sand, functional filler and expansion agent evenly according to the mass fraction to obtain component B; (4) Mix component A and component B evenly, and add adhesive according to the mass fraction to obtain a highly adhesive pavement crack repair material.

7. The application of the high-adhesion pavement crack repair material according to any one of claims 1 to 5 in the maintenance and repair of asphalt pavement.

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