A highway disease repairing material and a repairing method

Abstract

The application relates to the field of road engineering materials, and particularly discloses a highway disease repairing material and a repairing method. The repairing material comprises the following raw materials: SBS modified asphalt, waste rubber powder, tackifier, composite fiber stabilizer, mineral filler and reinforcing filler. The tackifier is epoxy acrylate resin, the composite fiber stabilizer comprises hydroxypropyl methyl cellulose and modified microcrystalline cellulose / talc powder compound. The modified microcrystalline cellulose / talc powder compound is prepared by the following steps: talc powder is treated by gamma-methacryloxypropyl trimethoxysilane and 3-allyloxy-2-hydroxy-1-propane sulfonic acid sodium salt, then mixed with microcrystalline cellulose, and then reacted with terephthalic acid and glycine. The repairing method comprises the following steps: removing redundant fragments; smearing tack layer oil, then mixing and paving the repairing material in a pit; rolling and leveling the highway pavement. The application has the characteristics of prolonging the service life of the repaired pavement.

Description

Technical Field

[0001] This application relates to the field of road engineering materials, and more specifically, to a road damage repair material and repair method. Background Technology

[0002] As a vital infrastructure for modern transportation, the quality and durability of highways directly affect the safety and efficiency of transportation. However, under the long-term influence of heavy traffic, natural environmental erosion, and improper maintenance, highways inevitably develop various defects such as cracks, potholes, and ruts. These defects not only affect the performance of highways but may also cause traffic accidents, threatening the safety of people's lives and property.

[0003] Potholes are one of the most prominent forms of asphalt pavement damage. They not only severely affect the road performance and driving comfort of asphalt pavements, but also pose a direct threat to vehicle safety. Especially during the rainy season in southern China and after the spring freeze-thaw cycle in northern China, potholes tend to erupt in concentrated bursts, posing a significant challenge to road maintenance. Therefore, developing efficient, rapid, and economical road repair materials is of great importance for improving road maintenance efficiency, extending road service life, and ensuring traffic safety.

[0004] Currently, the commonly used pothole repair methods mainly include hot-mix asphalt paving and cold-mix asphalt paving. Hot-mix asphalt paving results in high energy consumption and environmental pollution, and the high temperature causes asphalt aging, greatly reducing its effectiveness. Cold-mix asphalt paving, on the other hand, is simple and convenient to operate, can be used in rainy or snowy weather, and allows for quick reopening of traffic after repair, making it widely used in highway repair. However, compared to hot-mix asphalt, cold-mix asphalt has lower strength and is more prone to damage under high-strength or high-load conditions, requiring frequent repairs. Furthermore, cold-mix asphalt contains less asphalt, resulting in poorer binding force and inability to effectively bind aggregates, forming weak interfaces. This reduces the overall strength and stability of the mixture, leading to stress concentration and crack propagation, which in turn causes the pavement to crack and affects its service life. These issues result in a shorter service life after repair.

[0005] Therefore, further research and development is needed for the current cold patch asphalt material to repair potholes and other defects. It is crucial to develop a repair material that can improve the service life of the repaired pavement. Summary of the Invention

[0006] In order to improve the service life of the repaired road surface, this application provides a road damage repair material and repair method.

[0007] Firstly, this application provides a road damage repair material, employing the following technical solution:

[0008] A road repair material comprising the following raw materials in parts by weight: 10-20 parts SBS modified asphalt, 5-10 parts waste rubber powder, 5-15 parts tackifier, 3-8 parts composite fiber stabilizer, 50-80 parts mineral filler, and 5-10 parts reinforcing filler.

[0009] Among them, the tackifier is epoxy acrylate resin, and the composite fiber stabilizer includes hydroxypropyl methylcellulose and modified microcrystalline cellulose / talc composite in a mass ratio of 1:(1.5-2).

[0010] The modified microcrystalline cellulose / talc composite is prepared by first treating talc powder with sodium salt of γ-methacryloxypropyltrimethoxysilane and 3-allyloxy-2-hydroxy-1-propanesulfonate to obtain pretreated talc powder, and then mixing the pretreated talc powder with microcrystalline cellulose and reacting it with terephthalic acid and glycine.

[0011] By adopting the above technical solutions, this application uses SBS modified asphalt as the asphalt matrix, combined with mineral fillers to form an asphalt repair material. The addition of waste rubber powder can improve the flexibility and fatigue resistance of the repair material. Moreover, as an elastomer, rubber powder can form a three-dimensional network structure in the asphalt, playing a certain skeletal support role, thereby improving the overall strength of the repair material. Mineral fillers can fill the pores in the repair material, increasing the density, thereby enhancing the overall strength and stability of the repair material. Nanofillers significantly improve the mechanical properties and durability of the mixture. The tackifier selected is epoxy acrylate resin, which significantly improves the adhesion between asphalt and fillers, thereby improving the bonding performance of the repair material and reducing cracking. Hydroxypropyl methylcellulose in the composite fiber stabilizer, as a binder, can significantly improve the adhesion between the repair material and the road base layer, as well as the adhesion between the asphalt matrix and fillers. The addition of modified microcrystalline cellulose / talc composite can not only improve mechanical properties but also improve adhesion and compatibility with asphalt and other aggregate materials, ultimately significantly improving the strength and adhesion of the repair material and resulting in a longer service life.

[0012] The modified microcrystalline cellulose / talc composite is prepared by compounding modified talc with microcrystalline cellulose. The talc is first treated with γ-methacryloxypropyltrimethoxysilane and sodium 3-allyloxy-2-hydroxy-1-propanesulfonate. The trimethoxysilyl group in γ-methacryloxypropyltrimethoxysilane reacts with the hydroxyl groups on the surface of the talc particles, introducing methacryloxy groups onto the surface of the talc particles. The unsaturated double bonds in the methacryloxy groups can polymerize with the unsaturated double bonds in sodium 3-allyloxy-2-hydroxy-1-propanesulfonate. Furthermore, the sulfonic acid in sodium 3-allyloxy-2-hydroxy-1-propanesulfonate... The base can be intercalated to modify talc powder, achieving a pre-treatment of talc powder modification. Then, it is mixed with microcrystalline cellulose and reacted with terephthalic acid and glycine. The carboxyl functional groups in the above reactants react with the hydroxyl groups introduced from the macromolecules of microcrystalline cellulose, talc powder, and talc powder to form ester groups. In addition, benzene ring groups are introduced. Moreover, the amino groups in glycine can also form chemical reactions with the hydroxyl groups, ultimately forming a polymer network. This significantly improves the compatibility with the asphalt matrix. More importantly, it enhances the interfacial bonding force between the asphalt matrix and the filler, ultimately resulting in a repair material with higher mechanical properties and bonding strength, thus extending the service life of the repair material.

[0013] Optionally, the modified microcrystalline cellulose / talc composite is prepared by the following method:

[0014] 1) Prepare a silanol solution by mixing γ-methacryloxypropyltrimethoxysilane with anhydrous ethanol and adjusting the pH to 4-5;

[0015] 2) Then, the talc powder is impregnated in the silanol solution prepared above at a temperature of 50-60℃ for 2-3 hours. After filtration, it is washed with alcohol and dried to obtain modified talc powder.

[0016] 3) Dissolve sodium 3-allyloxy-2-hydroxy-1-propanesulfonate in water to prepare a modified solution, then add modified talc powder and disperse it by ultrasonication, then add an initiator and react at 65-75℃ for 1-2 hours, then centrifuge, wash with water, and dry to obtain pretreated talc powder.

[0017] 4) After washing microcrystalline cellulose with alkali, wash it with water and dry it to obtain activated microcrystalline cellulose. Mix the activated microcrystalline cellulose with pretreated talc powder and then ball mill it to obtain a mixture.

[0018] 5) Terephthalic acid and glycine were dissolved in N,N-dimethylacetamide to prepare a mixed solution. The mixture was then added, stirred, and an acid catalyst was added. The mixture was refluxed at 120-130℃ for 4-6 hours. After the reaction was completed, the mixture was washed with water and then vacuum dried to obtain the modified microcrystalline cellulose / talc composite.

[0019] By adopting the above technical solution, this application first impregnates talc powder in a silanol solution, allowing the silanol to react with the hydroxyl groups on the talc powder, introducing methacryloyloxy groups. Then, under the action of an initiator, allyl groups are copolymerized and grafted with the silane double bonds on the surface of the talc powder, introducing methacrylate groups, hydroxyl groups, and sulfonic acid groups onto the surface of the talc powder, thus obtaining pretreated talc powder. After alkali washing of microcrystalline cellulose, the hydroxyl reactivity on the surface of the microcrystalline cellulose is enhanced. After drying, it is mixed with the pretreated talc powder and ball-milled. Then, in a reaction solution of terephthalic acid and glycine, under the action of a catalyst, the carboxyl and amino groups in the above reaction solution can react with the hydroxyl groups in the pretreated talc powder and microcrystalline cellulose. Moreover, the carboxyl groups can also react with the sulfonic acid groups on the surface of the pretreated talc powder to form a three-dimensional cross-linked network, thereby significantly improving its strength and mechanical properties. Furthermore, the modified hydrophobic surface of the composite can improve its resistance to water erosion and enhance its durability. In addition, the introduction of benzene rings improves its compatibility with the asphalt matrix and enhances the adhesion between the asphalt and the filler, thereby improving its service life.

[0020] Optionally, in the preparation of the modified microcrystalline cellulose / talc composite, the volume ratio of γ-methacryloxypropyltrimethoxysilane to anhydrous ethanol in step 1) is 1:(6-8).

[0021] In step 2), the mass ratio of talc powder to silanol solution is 1:(5-6).

[0022] In step 3), the mass concentration of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate in the modified solution is 10-15 wt%, and the mass ratio of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate to modified talc is 1:(4-5). The amount of initiator added is 0.5-1 wt% of the modified talc.

[0023] In step 4), the mass ratio of activated microcrystalline cellulose to pretreated talc is 1:(1.8-2.5).

[0024] In step 5), the mass ratio of terephthalic acid to glycine is 1:(0.5-0.8), the mass ratio of terephthalic acid to water is 1:(6-8), the amount of acid catalyst added is 1-2 wt% of the amount of terephthalic acid added, and the mass ratio of terephthalic acid to the mixture is 1:(3-4).

[0025] By adopting the above technical solution, the modified microcrystalline cellulose / talc composite prepared with the above-mentioned amount of additives has better final performance when added to the repair material.

[0026] Optionally, the mineral filler comprises cement, stone powder, crushed stone and sand in a mass ratio of 1:(2-3):(10-12):(6-8).

[0027] By adopting the above technical solutions, materials such as stone powder and cement can absorb the tiny pores in asphalt, improve plasticity, and better adapt to external environmental influences such as road deformation and vibration. Furthermore, it was found that the addition of cement can also compensate for the early strength deficiencies of the repair material described in this application.

[0028] Optionally, the reinforcing filler is prepared by loading nano-silica onto a modified porous carrier, which is obtained by modifying a porous gasification slag / waste adhesive powder composite with hexadecyltrimethylammonium chloride.

[0029] By adopting the above technical solution, the reinforcing filler in this application is prepared by loading nano-silica onto a modified porous carrier. The addition of nano-silica utilizes its specific surface area to regulate interfacial properties. Furthermore, the hydroxyl groups on the surface of the nano-silica can chemically interact with the carboxyl and amino functional groups on the composite fiber stabilizer, while the benzene rings on the composite fiber stabilizer can form conjugated chemical bonds with the aromatics in the modified asphalt. Moreover, after being loaded onto the porous carrier, the nano-silica forms a porous adsorption structure, and hydrogen bonds and van der Waals forces can also be formed between the surface hydroxyl groups and asphalt molecules. Ultimately, this improves the adhesion between the asphalt and the filler in the system of this application. The material is made from a composite of gasification slag and waste adhesive powder. This porous carrier provides a supporting function while the gasification slag provides strength and the waste adhesive powder provides toughness, thereby improving the strength and toughness of the repair material, resulting in better mechanical properties and resistance to deformation, and extending its service life. The hexadecyltrimethylammonium chloride-modified porous gasification slag / waste adhesive powder composite material gives the gasification slag a positive charge on its surface, allowing it to electrostatically adsorb with the negatively charged asphalt. Finally, the addition of reinforcing filler in this application not only increases strength but also improves toughness. More importantly, it interacts with asphalt, filler, and composite fiber stabilizer to improve the bonding force, resulting in a repair material with better durability.

[0030] Optionally, the porous gasification slag / waste adhesive powder composite is prepared by the following method:

[0031] Gasification slag and waste rubber powder are mixed to obtain a mixed powder. Then, the mixed powder is mixed with water, ultrasonically dispersed, hydroxyethyl cellulose is added and mixed, then polyurethane prepolymer is added and mixed. The mixture is stirred and foamed, allowed to stand and solidify, and then air-dried to obtain a porous gasification slag / waste rubber powder composite.

[0032] By adopting the above technical solution, this application utilizes the reaction of isocyanate groups in polyurethane prepolymer with water during the stirring process to generate carbon dioxide gas, which forms bubbles that are evenly distributed in the mixture, forming a porous structure. Combined with the rich pore structure of the gasification slag itself, a porous carrier with a rich pore structure is formed, which realizes the formation of a porous adsorption structure after loading nano-silica, achieving a tight interaction between asphalt and filler, and improving mechanical properties and stability.

[0033] Optionally, in the preparation process of the porous gasification slag / waste rubber powder composite, the mass ratio of gasification slag to waste rubber powder is 1:(0.4-0.5), the mass ratio of mixed powder to water is 1:(6-8), the amount of hydroxyethyl cellulose added is 1-3wt% of the amount of mixed powder added, and the mass ratio of polyurethane prepolymer to mixed powder is 1:(3-5).

[0034] By adopting the above technical solution and adjusting the addition ratio of gasification slag and waste adhesive powder, the final repair material exhibits better overall strength and toughness, possessing higher strength and better resistance to deformation, resulting in improved durability. The addition of hydroxyethyl cellulose plays a role in preventing sedimentation and aids in the dispersion of the mixed powder in water.

[0035] Optionally, the reinforcing filler is prepared by the following method:

[0036] After dissolving hexadecyltrimethylammonium chloride in water at a mass ratio of 1:(4-6), a porous gasification slag / waste adhesive powder composite was added, with the mass ratio of the porous gasification slag / waste adhesive powder composite to hexadecyltrimethylammonium chloride being 1:(0.2-0.3). The mixture was impregnated for 40-60 minutes at a temperature of 30-40°C. After impregnation, the mixture was filtered and dried to obtain the modified porous carrier.

[0037] Nano-silica is dispersed in ethanol at a mass ratio of 1:(4-5), polyethylene glycol is added, and a suspension is obtained after ultrasonic treatment. Then, a modified porous carrier is added to the suspension and impregnated under pressure of 0.5-0.8 MPa for 30-50 min. After impregnation, the carrier is first dried at 50-60℃ for 1.5-2.5 h, and then heated to 120-130℃ for 3-4 h to obtain the reinforcing filler. The amount of polyethylene glycol added is 3-5 wt% of the amount of nano-silica added, and the mass ratio of modified porous carrier to nano-silica is 1:(0.4-0.6).

[0038] Optionally, when preparing the reinforcing filler, the modified porous carrier is impregnated under pressure in a suspension and dried, and then impregnated in a silane coupling agent solution and dried to obtain the reinforcing filler.

[0039] By adopting the above technical solution, after loading nano-silica onto a modified porous support, it is further treated with a silane coupling agent, so that the nano-silica and the porous support are bonded by silicon-oxygen bonds, thereby improving its loading strength.

[0040] Optionally, the repair material is prepared by the following method:

[0041] After mixing mineral fillers, reinforcing fillers, and composite fiber stabilizers, waste rubber powder is added and mixed to obtain a preliminary mixture.

[0042] The SBS modified bitumen and tackifier are mixed and then added to the initial mixture and stirred to obtain the repair material.

[0043] Secondly, this application provides a method for repairing highway defects, employing the following technical solution:

[0044] A method for repairing highway defects includes the following steps:

[0045] S1. Remove excess debris from the pit;

[0046] S2. Apply tack coat to the inner walls and bottom of the pit, and then mix and spread the repair material in the pit.

[0047] S3. Compacting and leveling the road surface.

[0048] By adopting the above technical solution and the repair method in this application, rapid repair of road potholes can be achieved, allowing light vehicles to pass after 1 hour, reducing traffic impact. Moreover, it has better strength and deformation resistance, shorter service life, and alleviates the current tendency to crack.

[0049] In summary, this application has the following beneficial effects:

[0050] 1. In this application, hydroxypropyl methylcellulose in the composite fiber stabilizer can significantly improve the adhesion between the repair material and the road base layer, as well as the adhesion between the asphalt matrix and the filler. The addition of modified microcrystalline cellulose / talc composite can not only improve mechanical properties, but also improve adhesion and compatibility with asphalt and other aggregate materials, ultimately significantly improving the strength and adhesion of the repair material and giving it a longer service life.

[0051] 2. In this application, the reinforcing filler is prepared by loading nano-silica onto a modified porous carrier. The addition of nano-silica utilizes its specific surface area to regulate interfacial properties. Furthermore, the hydroxyl groups on the surface of nano-silica can chemically interact with the carboxyl and amino functional groups on the composite fiber stabilizer, while the benzene rings on the composite fiber stabilizer can form conjugated chemical bonds with the aromatics in the modified asphalt. Moreover, after being loaded onto the porous carrier, nano-silica forms a porous adsorption structure, and hydrogen bonds and van der Waals forces can also be formed between the surface hydroxyl groups and asphalt molecules. Ultimately, the adhesion between the asphalt and the filler is improved in this application system. In addition, the porous carrier is prepared by a composite of gasification slag and waste rubber powder. Thus, the porous carrier provides a carrier function while the gasification slag provides strength and the waste rubber powder provides toughness, thereby improving the strength and toughness of the repair material, resulting in better mechanical properties and deformation resistance, and extending its service life. Detailed Implementation

[0052] The following detailed description of this application is provided in conjunction with the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments are all from commercially available sources.

[0053] In the following examples, the SBS modified asphalt used was Dejia No. 70 SBS modified asphalt from Xingtai Dejia Road Materials Sales Co., Ltd.

[0054] The epoxy acrylate resin used is from Langfang Fuchen New Materials Co., Ltd.

[0055] The polyurethane prepolymer used was the polyurethane prepolymer branded by Hubei Yamed Biomedical Co., Ltd., with an NCO content of 7.8%.

[0056] The cement used is P.O42.5 ordinary Portland cement; the stone powder is stone powder with a particle size of 200-400 mesh formed by grinding stones; the crushed stone is crushed stone with a continuous particle size of 5-20mm; and the sand is quartz sand with a particle size of 1-3mm.

[0057] The following preparation examples illustrate the preparation of microcrystalline cellulose / talc composites.

[0058] Preparation Example 1

[0059] A method for preparing a microcrystalline cellulose / talc composite includes the following steps:

[0060] 1) Prepare a silanol solution by mixing γ-methacryloxypropyltrimethoxysilane with anhydrous ethanol at a volume ratio of 1:7 and adjusting the pH to 4.5.

[0061] 2) Then, the talc powder is impregnated in the silanol solution prepared above. The mass ratio of talc powder to silanol solution is 1:5.5, the impregnation temperature is 55℃, the impregnation time is 2.5h, and then the mixture is filtered, washed with alcohol, and dried to obtain modified talc powder.

[0062] 3) Sodium 3-allyloxy-2-hydroxy-1-propanesulfonate was dissolved in water to prepare a modified solution with a mass concentration of 12 wt%. Modified talc powder was then added and ultrasonically dispersed. Ammonium persulfate was then added as an initiator and reacted at 70°C for 1.5 h. After centrifugation, the mixture was washed with water and dried to obtain pretreated talc powder.

[0063] The mass ratio of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate to modified talc is 1:4.5, and the amount of initiator added is 0.8 wt% of the modified talc.

[0064] 4) The microcrystalline cellulose was washed with an alkaline solution of sodium hydroxide with a mass concentration of 10 wt%, the sodium hydroxide solution being 4 times the mass of the microcrystalline cellulose. Then it was washed with water and dried to obtain activated microcrystalline cellulose. The activated microcrystalline cellulose was mixed with pretreated talc powder at a mass ratio of 1:2 and then ball-milled to obtain a mixture.

[0065] 5) Terephthalic acid and glycine were mixed at a mass ratio of 1:0.6, and then mixed with water to obtain a mixture. The mass ratio of terephthalic acid to water was 1:7. Then, a mixture was added to the mixture, and the mass ratio of terephthalic acid to the mixture was 1:3.5. After stirring, a 40% hydrochloric acid catalyst was added, with the amount of hydrochloric acid catalyst added being 1.5 wt% of the amount of terephthalic acid added. The mixture was refluxed at 125℃ for 5 hours. After the reaction was completed, the mixture was washed with water and then vacuum dried to obtain the modified microcrystalline cellulose / talc composite.

[0066] Preparation Example 2

[0067] A method for preparing a microcrystalline cellulose / talc composite includes the following steps:

[0068] 1) Prepare a silanol solution by mixing γ-methacryloxypropyltrimethoxysilane with anhydrous ethanol at a volume ratio of 1:6 and adjusting the pH to 4.

[0069] 2) Then, the talc powder is impregnated in the silanol solution prepared above. The mass ratio of talc powder to silanol solution is 1:5, the impregnation temperature is 50℃, and the impregnation time is 3h. After filtration, the talc powder is washed with alcohol and dried to obtain modified talc powder.

[0070] 3) Dissolve sodium 3-allyloxy-2-hydroxy-1-propanesulfonate in water to prepare a modified solution. The mass concentration of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate in the modified solution is 10 wt%. Then, add modified talc powder and disperse it by ultrasonication. Then, add ammonium persulfate as an initiator and react at 65°C for 2 hours. After centrifugation, wash with water and dry to obtain pretreated talc powder.

[0071] The mass ratio of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate to modified talc is 1:4, and the amount of initiator added is 0.5 wt% of the modified talc.

[0072] 4) The microcrystalline cellulose was washed with an alkaline solution of sodium hydroxide with a mass concentration of 10 wt%, the sodium hydroxide solution being 3 times the mass of the microcrystalline cellulose. Then it was washed with water and dried to obtain activated microcrystalline cellulose. The activated microcrystalline cellulose was mixed with pretreated talc powder at a mass ratio of 1:1.8 and then ball-milled to obtain a mixture.

[0073] 5) Terephthalic acid and glycine were mixed at a mass ratio of 1:0.5, and then mixed with water to obtain a mixture. The mass ratio of terephthalic acid to water was 1:6. Then, a mixture was added to the mixture, with the mass ratio of terephthalic acid to the mixture being 1:3. After stirring, a 40% hydrochloric acid catalyst was added, with the amount of hydrochloric acid catalyst added being 1 wt% of the amount of terephthalic acid added. The mixture was refluxed at 120℃ for 6 hours. After the reaction was completed, the mixture was washed with water and then vacuum dried to obtain the modified microcrystalline cellulose / talc composite.

[0074] Preparation Example 3

[0075] A method for preparing a microcrystalline cellulose / talc composite includes the following steps:

[0076] 1) Prepare a silanol solution by mixing γ-methacryloxypropyltrimethoxysilane with anhydrous ethanol at a volume ratio of 1:8 and adjusting the pH to 5.

[0077] 2) Then, the talc powder is impregnated in the silanol solution prepared above. The mass ratio of talc powder to silanol solution is 1:6, the impregnation temperature is 60℃, and the impregnation time is 2h. After filtration, the talc powder is washed with alcohol and dried to obtain modified talc powder.

[0078] 3) Dissolve sodium 3-allyloxy-2-hydroxy-1-propanesulfonate in water to prepare a modified solution. The mass concentration of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate in the modified solution is 15 wt%. Then, add modified talc powder and disperse it by ultrasonication. Then, add ammonium persulfate as an initiator and react at 75°C for 1 h. After centrifugation, wash with water and dry to obtain pretreated talc powder.

[0079] The mass ratio of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate to modified talc is 1:5, and the amount of initiator added is 1 wt% of the modified talc.

[0080] 4) The microcrystalline cellulose was washed with an alkaline solution of sodium hydroxide with a mass concentration of 10 wt%, the sodium hydroxide solution being 5 times the mass of the microcrystalline cellulose. Then it was washed with water and dried to obtain activated microcrystalline cellulose. The activated microcrystalline cellulose was mixed with pretreated talc powder at a mass ratio of 1:2.5 and then ball-milled to obtain a mixture.

[0081] 5) Terephthalic acid and glycine were mixed at a mass ratio of 1:0.8, and then mixed with water to obtain a mixture. The mass ratio of terephthalic acid to water was 1:8. Then, a mixture was added to the mixture, with the mass ratio of terephthalic acid to the mixture being 1:4. After stirring, a 40% hydrochloric acid catalyst was added, with the amount of hydrochloric acid catalyst being 2wt% of the amount of terephthalic acid added. The mixture was refluxed at 130℃ for 4 hours. After the reaction was completed, the mixture was washed with water and then vacuum dried to obtain the modified microcrystalline cellulose / talc composite.

[0082] Comparative Preparation Example 1

[0083] A method for preparing a microcrystalline cellulose / talc composite is carried out according to the method in Preparation Example 1, except that glycine is replaced with terephthalic acid in step 5).

[0084] Comparative Preparation Example 2

[0085] A method for preparing a microcrystalline cellulose / talc composite is carried out according to the method in Preparation Example 1, except that step 3) is not performed, and in step 4), the activated microcrystalline cellulose is directly mixed with the modified talc obtained in step 2) and then ball-milled to obtain a mixture.

[0086] Example 1

[0087] A method for preparing a road damage repair material includes the following steps:

[0088] 65 kg of mineral filler, 8 kg of reinforcing filler, and 5 kg of composite fiber stabilizer were mixed together, and then 8 kg of waste rubber powder was added to prepare a preliminary mixture.

[0089] 15 kg of SBS modified bitumen and 10 kg of tackifier were mixed and then added to the initial mixture and stirred to obtain the repair material.

[0090] The mineral filler includes cement, stone powder, crushed stone and sand in a mass ratio of 1:2.5:11:7; the tackifier is epoxy acrylate resin; and the composite fiber stabilizer includes a mixture of hydroxypropyl methylcellulose and the modified microcrystalline cellulose / talc composite prepared in Preparation Example 1 in a mass ratio of 1:1.8.

[0091] The reinforcing filler is prepared by the following method:

[0092] Step 1: Preparation of porous gasification slag / waste rubber powder composite: Gasification slag and waste rubber powder are mixed at a mass ratio of 1:0.4 to obtain a mixed powder. Then, the mixed powder is mixed with water at a mass ratio of 1:7, ultrasonically dispersed, and hydroxyethyl cellulose is added and mixed. The amount of hydroxyethyl cellulose added is 2wt% of the total amount of the mixed powder. Then, polyurethane prepolymer is added and mixed. The mass ratio of polyurethane prepolymer to mixed powder is 1:4. The mixture is stirred and foamed, allowed to stand for 24 hours to solidify, and then air-dried to obtain a porous gasification slag / waste rubber powder composite.

[0093] Step 2: Preparation of modified porous support: Hexadecyltrimethylammonium chloride and water are mixed and dissolved at a mass ratio of 1:5. The porous gasification slag / waste adhesive powder composite prepared in Step 1 is then added. The mass ratio of the porous gasification slag / waste adhesive powder composite to hexadecyltrimethylammonium chloride is 1:0.2. The mixture is impregnated for 50 minutes at a temperature of 35°C. After impregnation, the mixture is filtered and dried to obtain the modified porous support.

[0094] Step 3: Disperse nano-silica in ethanol at a mass ratio of 1:4.5, add polyethylene glycol, and sonicate to obtain a suspension. Then add the modified porous carrier obtained in Step 2 to the suspension and impregnate it under pressure at 0.6 MPa for 40 min. First, dry it at 55℃ for 2 h, and then heat it to 125℃ for 3.5 h to obtain the reinforcing filler. The amount of polyethylene glycol added is 4 wt% of the amount of nano-silica added, and the mass ratio of modified porous carrier to nano-silica is 1:0.5.

[0095] Example 2

[0096] A method for preparing a road damage repair material includes the following steps:

[0097] Mix 50kg of mineral filler, 5kg of reinforcing filler, and 3kg of composite fiber stabilizer, then add 5kg of waste rubber powder and mix to obtain a preliminary mixture.

[0098] 10 kg of SBS modified bitumen and 5 kg of tackifier were mixed and then added to the initial mixture and stirred to obtain the repair material.

[0099] The mineral filler includes cement, stone powder, crushed stone and sand in a mass ratio of 1:2:10:6; the tackifier is epoxy acrylate resin; and the composite fiber stabilizer includes a mixture of hydroxypropyl methylcellulose and the modified microcrystalline cellulose / talc composite prepared in Preparation Example 2 in a mass ratio of 1:1.5.

[0100] The reinforcing filler is prepared by the following method:

[0101] Step 1: Preparation of porous gasification slag / waste adhesive powder composite: Gasification slag and waste adhesive powder are mixed at a mass ratio of 1:0.4 to obtain a mixed powder. Then, the mixed powder is mixed with water at a mass ratio of 1:6, ultrasonically dispersed, and hydroxyethyl cellulose is added and mixed. The amount of hydroxyethyl cellulose added is 1 wt% of the total amount of the mixed powder. Then, polyurethane prepolymer is added and mixed. The mass ratio of polyurethane prepolymer to mixed powder is 1:3. The mixture is stirred and foamed, allowed to stand for 24 hours to solidify, and then air-dried to obtain a porous gasification slag / waste adhesive powder composite.

[0102] Step 2: Preparation of modified porous support: Hexadecyltrimethylammonium chloride and water are mixed and dissolved in a mass ratio of 1:4. The porous gasification slag / waste adhesive powder composite prepared in Step 1 is then added. The mass ratio of the porous gasification slag / waste adhesive powder composite to hexadecyltrimethylammonium chloride is 1:0.2. The mixture is impregnated for 40 minutes at a temperature of 40°C. After impregnation, the mixture is filtered and dried to obtain the modified porous support.

[0103] Step 3: Disperse nano-silica in ethanol at a mass ratio of 1:4, add polyethylene glycol, and sonicate to obtain a suspension. Then add the modified porous carrier obtained in Step 2 to the suspension, pressurize and impregnate at a pressure of 0.5 MPa for 50 min. First, dry at 50℃ for 2.5 h, then heat to 120℃ for 4 h to obtain the reinforcing filler. The amount of polyethylene glycol added is 3 wt% of the amount of nano-silica added, and the mass ratio of modified porous carrier to nano-silica is 1:0.4.

[0104] Example 3

[0105] A method for preparing a road damage repair material includes the following steps:

[0106] Mix 80kg of mineral filler, 10kg of reinforcing filler, and 8kg of composite fiber stabilizer, then add 10kg of waste rubber powder and mix to obtain a preliminary mixture.

[0107] 20 kg of SBS modified bitumen and 15 kg of tackifier were mixed and then added to the initial mixture and stirred to obtain the repair material.

[0108] The mineral filler includes cement, stone powder, crushed stone and sand in a mass ratio of 1:3:12:8; the tackifier is epoxy acrylate resin; and the composite fiber stabilizer includes a mixture of hydroxypropyl methylcellulose and the modified microcrystalline cellulose / talc composite prepared in Preparation Example 3 in a mass ratio of 1:2.

[0109] The reinforcing filler is prepared by the following method:

[0110] Step 1: Preparation of porous gasification slag / waste rubber powder composite: Gasification slag and waste rubber powder are mixed at a mass ratio of 1:0.5 to obtain a mixed powder. Then, the mixed powder is mixed with water at a mass ratio of 1:8, ultrasonically dispersed, and hydroxyethyl cellulose is added and mixed. The amount of hydroxyethyl cellulose added is 3wt% of the total amount of the mixed powder. Then, polyurethane prepolymer is added and mixed. The mass ratio of polyurethane prepolymer to mixed powder is 1:5. The mixture is stirred and foamed, allowed to stand for 24 hours to solidify, and then air-dried to obtain a porous gasification slag / waste rubber powder composite.

[0111] Step 2: Preparation of modified porous support: Hexadecyltrimethylammonium chloride and water are mixed and dissolved at a mass ratio of 1:6. The porous gasification slag / waste adhesive powder composite prepared in Step 1 is then added. The mass ratio of the porous gasification slag / waste adhesive powder composite to hexadecyltrimethylammonium chloride is 1:0.3. The mixture is impregnated for 60 minutes at a temperature of 30°C. After impregnation, the mixture is filtered and dried to obtain the modified porous support.

[0112] Step 3: Disperse nano-silica in ethanol at a mass ratio of 1:5, add polyethylene glycol, and sonicate to obtain a suspension. Then, add the modified porous carrier obtained in Step 2 to the suspension and impregnate it under pressure at 0.8 MPa for 30 min. First, dry it at 60℃ for 1.5 h, and then heat it to 130℃ for 3 h to obtain the reinforcing filler. The amount of polyethylene glycol added is 5 wt% of the amount of nano-silica added, and the mass ratio of modified porous carrier to nano-silica is 1:0.6.

[0113] Example 4

[0114] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that in the preparation of the reinforcing filler, the porous gasification slag / waste rubber powder composite in step three is impregnated in a suspension under pressure and dried to form a primary filler. The primary filler is then impregnated in a KH-550 silane coupling agent solution with a mass concentration of 5 wt% for 30 min and dried to obtain the reinforcing filler. The silane coupling agent solution is 8 times the mass of the primary filler, and the impregnation temperature is 30℃.

[0115] Example 5

[0116] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that in the preparation of the reinforcing filler, the porous gasification slag / waste rubber powder composite in step three is impregnated in a suspension under pressure and dried to form a primary filler. The primary filler is then impregnated in a KH-550 silane coupling agent solution with a mass concentration of 5 wt% for 20 min and dried to obtain the reinforcing filler. The silane coupling agent solution is 7 times the mass of the primary filler, and the impregnation temperature is 35℃.

[0117] Example 6

[0118] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that the reinforcing filler is selected from zeolite and nano-silica in a mass ratio of 1:0.5.

[0119] Example 7

[0120] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that the reinforcing filler is gasified slag and nano-silica in a mass ratio of 1:0.5.

[0121] Example 8

[0122] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that step one is not performed when preparing the reinforcing filler, and the porous gasification slag / waste rubber powder composite is replaced with zeolite in an equal amount in step two, while the rest is carried out according to the method in Example 1.

[0123] Comparative Examples 1-2

[0124] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that the modified microcrystalline cellulose / talc composite is selected from the modified microcrystalline cellulose / talc composites prepared in Comparative Example 1 and Comparative Example 2, respectively.

[0125] Comparative Example 3

[0126] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that the modified microcrystalline cellulose / talc complex in the composite fiber stabilizer is replaced by microcrystalline cellulose in equal amounts. That is, the composite fiber stabilizer includes hydroxypropyl methylcellulose and microcrystalline cellulose in a mass ratio of 1:1.8.

[0127] Comparative Example 4

[0128] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that the modified microcrystalline cellulose / talc complex in the composite fiber stabilizer is replaced by an equal amount of a mixture of microcrystalline cellulose and talc, and the mass ratio of microcrystalline cellulose to talc is 1:2.

[0129] Comparative Example 5

[0130] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that no composite fiber stabilizer is added to the raw materials.

[0131] Comparative Example 6

[0132] A method for preparing a road damage repair material is carried out according to the method in Example 1, except that no reinforcing filler is added to the raw materials.

[0133] This application also discloses a method for repairing highway defects using the aforementioned repair materials, including the following steps:

[0134] S1. Remove excess debris from the pit;

[0135] S2. Apply tack coat (PC-3 cationic emulsified asphalt from Maoming Zhengcheng Petrochemical Co., Ltd.) to the inner walls and bottom of the pit, and then mix and spread the repair material in the pit.

[0136] S3. Compacting and leveling the road surface.

[0137] Performance testing

[0138] The repair materials prepared in the embodiments and comparative examples of this application were first poured into a mold, leveled, and compacted. The specimens were then demolded after 95 compactions to obtain specimens. The compressive strength of the specimens was tested. In addition, the adhesion between asphalt and aggregate, penetration strength, Marshall stability, and residual stability were tested according to the "Cold Patch Material for Potholes in Asphalt Pavement" (JT / T 972-2015) and the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The test results are shown in Table 1 below.

[0139] Table 1:

[0140]

[0141]

[0142] Continued from Table 1:

[0143]

[0144] Referring to the test results in Table 1 above, the repair material prepared in the embodiments of this application has higher compressive strength and penetration strength, higher load-bearing capacity and resistance to damage, as well as good adhesion, better bonding force between asphalt and aggregate, and higher Marshall stability and residual stability, exhibiting good durability. Referring to the test results of Examples 1 and 4-5, when preparing the reinforcing filler, after loading nano-silica onto the porous carrier, it was treated with a silane coupling agent, which improved its strength, adhesion, and durability. This not only facilitates the chemical bonding between nano-silica and the porous carrier but also enhances its compatibility and interaction with other asphalt and fillers in the system, thereby further improving the performance of the repair material.

[0145] Combining the test results of Examples 1 and 6-7, when ordinary zeolite or gasification slag is mixed with nano-silica as the reinforcing filler, its performance is reduced. When the reinforcing filler is added by loading and modification in this application, it not only helps to improve the resistance to deformation, but also improves its service life. Combining the test results of Example 8, when nano-silica is directly loaded onto zeolite, its penetration strength is reduced and its durability is also reduced. The selection of porous carrier in the reinforcing filler helps to improve the loading of nano-silica and is more beneficial to the resistance to deformation. Referring to the test results of Example 1 and Comparative Examples 1 and 2, the overall performance of the microcrystalline cellulose / talc composite was reduced when glycine was not added during preparation. The introduction of amino and carboxyl groups in glycine not only helps to interact with the hydroxyl groups on the surface of microcrystalline cellulose and talc, but also forms chemical bonds with the reinforcing filler, which helps to improve the overall adhesion and durability of the repair material. Combined with the test results of Comparative Example 3, the performance was similar when microcrystalline cellulose was directly added to the composite fiber stabilizer or when microcrystalline cellulose was mixed with talc and added directly in Comparative Example 4, but much weaker than the test results of Example 1. Combined with the test results of Comparative Examples 5 and 6, the performance was significantly reduced when neither the composite fiber stabilizer nor the reinforcing filler was added.

[0146] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A highway distress repair material, characterized in that, The following raw materials are included by weight parts: 10-20 parts of SBS modified asphalt, 5-10 parts of waste rubber powder, 5-15 parts of tackifier, 3-8 parts of composite fiber stabilizer, 50-80 parts of mineral filler, 5-10 parts of reinforcing filler; The tackifier is selected from epoxy acrylate resin, and the composite fiber stabilizer includes hydroxypropyl methyl cellulose and modified microcrystalline cellulose / talc powder compound with a mass ratio of 1: (1.5-2); The modified microcrystalline cellulose / talc powder compound is prepared by first treating the talc powder with gamma-methacryloxypropyltrimethoxysilane and 3-allyloxy-2-hydroxy-1-propane sulfonic acid sodium salt to obtain pretreated talc powder, mixing the pretreated talc powder with microcrystalline cellulose, and then reacting with terephthalic acid and glycine.

2. A highway distress repair material according to claim 1, characterized in that: The modified microcrystalline cellulose / talc powder compound is prepared by the following method: 1) Mix gamma-methacryloxypropyltrimethoxysilane with anhydrous ethanol, adjust the pH to 4-5, and prepare a silanol solution; 2) Then immerse the talc powder in the prepared silanol solution, the immersion temperature is 50-60℃, the immersion time is 2-3h, then filter and alcohol wash, dry to obtain modified talc powder; 3) Dissolve 3-allyloxy-2-hydroxy-1-propane sulfonic acid sodium salt in water to obtain a modification solution, then ultrasonic dispersion after adding modified talc powder, then add initiator and react at 65-75℃ for 1-2h, then centrifugal separation, water washing and drying to obtain pretreated talc powder; 4) Alkaline washing, water washing and drying of microcrystalline cellulose to obtain activated microcrystalline cellulose, mixing the activated microcrystalline cellulose with pretreated talc powder and ball milling to obtain a mixture; 5) Dissolve terephthalic acid and glycine in N,N-dimethylacetamide to obtain a mixed solution, then add the mixture, stir and add acid catalyst, reflux at 120-130℃ for 4-6h, then water washing and vacuum drying after the reaction to obtain the modified microcrystalline cellulose / talc powder compound.

3. A highway distress repair material according to claim 2, wherein: In the preparation process of the modified microcrystalline cellulose / talc powder compound, the volume ratio of gamma-methacryloxypropyltrimethoxysilane to anhydrous ethanol in step 1) is 1: (6-8); The mass ratio of talc powder to silanol solution in step 2) is 1: (5-6); In step 3), the mass concentration of 3-allyloxy-2-hydroxy-1-propane sulfonic acid sodium salt in the modification solution is 10-15wt%, and the mass ratio of 3-allyloxy-2-hydroxy-1-propane sulfonic acid sodium salt to modified talc powder is 1: (4-5), and the amount of initiator added is 0.5-1wt% of the modified talc powder; In step 4), the mass ratio of activated microcrystalline cellulose to pretreated talc powder is 1: (1.8-2.5); In step 5), the mass ratio of terephthalic acid to glycine is 1: (0.5-0.8), and the mass ratio of terephthalic acid to water is 1: (6-8), and the amount of acid catalyst added is 1-2wt% of the amount of terephthalic acid added, and the mass ratio of terephthalic acid to the mixture is 1: (3-4).

4. A highway distress repair material as defined in claim 1, wherein: The mineral filler comprises cement, stone powder, crushed stone and sand in a mass ratio of 1:(2-3):(10-12):(6-8).

5. A highway distress repair material as defined in claim 1, wherein: The reinforcing filler is prepared by loading nano-silica on a modified porous carrier, and the modified porous carrier is prepared from a porous gasification slag / waste rubber powder composite modified by hexadecyl trimethyl ammonium chloride. The porous gasification slag / waste rubber powder composite is prepared by mixing gasification slag and waste rubber powder to obtain mixed powder, then mixing the mixed powder with water, ultrasonic dispersion, adding hydroxyethyl cellulose, mixing, then adding polyurethane prepolymer, mixing, stirring and foaming, standing and solidifying, and air drying.

6. A highway distress repair material according to claim 5, wherein: In the preparation of the porous gasification slag / waste rubber powder composite, the mass ratio of the gasification slag to the waste rubber powder is 1:(0.4-0.5), the mass ratio of the mixed powder to water is 1:(6-8), the amount of hydroxyethyl cellulose is 1-3wt% of the amount of the mixed powder, and the mass ratio of the polyurethane prepolymer to the mixed powder is 1:(3-5).

7. A highway distress repair material as defined in claim 5, wherein: The reinforcing filler is prepared by the following method: After hexadecyl trimethyl ammonium chloride and water are mixed and dissolved in a mass ratio of 1:(4-6), the porous gasification slag / waste rubber powder composite is added, the mass ratio of the porous gasification slag / waste rubber powder composite to hexadecyl trimethyl ammonium chloride is 1:(0.2-0.3), and the impregnation is carried out at 30-40℃ for 40-60min, followed by filtration and drying to obtain the modified porous carrier; Nano-silica is dispersed in ethanol, and the mass ratio of the nano-silica to ethanol is 1:(4-5), polyethylene glycol is added, and a suspension is obtained after ultrasonic treatment, then the modified porous carrier is added to the suspension, pressure impregnation is carried out, the impregnation pressure is 0.5-0.8MPa, and the impregnation is carried out for 30-50min, followed by drying at 50-60℃ for 1.5-2.5h, then heating to 120-130℃ for 3-4h to obtain the reinforcing filler, wherein the amount of polyethylene glycol is 3-5wt% of the amount of the nano-silica, and the mass ratio of the modified porous carrier to the nano-silica is 1:(0.4-0.6).

8. A highway distress repair material according to claim 7, characterized in that: In the preparation of the reinforcing filler, the modified porous carrier is impregnated in a silane coupling agent solution after pressure impregnation and drying in the suspension, and the reinforcing filler is obtained after drying.

9. A method of repairing a highway defect, the method comprising: The method comprises the following steps: S1, removing excess debris in the pit slot; S2, applying adhesive oil on the inner wall and the bottom of the pit slot, and then mixing and paving the road disease repairing material in the pit slot; S3, rolling and leveling the road surface.

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