Anti-cracking mortar for highway crack repair and preparation method thereof

Abstract

The present application relates to the field of highway maintenance engineering, and more specifically mentions an anti-cracking mortar for repairing highway cracks and its preparation method. The anti-cracking mortar for repairing highway cracks, in parts by mass, includes the following raw materials: 90-130 parts of gel material, 10-20 parts of composite reinforcing agent, 120-180 parts of aggregate, 5-15 parts of polymer adjuvant, 2-10 parts of propylene glycol, 0.3-0.8 parts of water reducer, 0.3-0.6 parts of retarder, 1.5-5 parts of combination auxiliary agent, 20-40 parts of water, etc. The anti-cracking mortar finally prepared by the present application not only has more excellent anti-cracking performance, but also can maintain good adhesion at the same time, and has excellent adaptability, weather resistance, and salt corrosion resistance in high and low temperature environments. It has an excellent service life, reduces maintenance frequency, and meets the comprehensive performance requirements of the existing highway maintenance engineering field for anti-cracking mortar for repair.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of highway maintenance engineering, and more particularly to an anti-cracking mortar for repairing highway cracks and a preparation method thereof. BACKGROUND

[0002] With the rapid development of China's transportation infrastructure, the scale of highway construction and maintenance engineering is continuously expanding. During the long-term use of highways, due to the influence of multiple factors such as traffic load, environmental temperature change, freeze-thaw cycle, and foundation settlement, cracks and other diseases are prone to occur. These cracks not only affect the appearance and driving comfort of the road surface, but more seriously, they become channels for water penetration, accelerating the damage of the base and subgrade, and thus leading to the overall failure of the road surface structure and shortening the service life of the road.

[0003] Under the action of multiple factors such as long-term traffic load, environmental temperature and humidity change, and uneven foundation settlement, highway pavements generally produce structural damage such as reflection cracks and fatigue cracks. According to industry research data, the overall service life of pavements with a crack disease repair rate of more than 60% will be reduced by more than 50%. In order to effectively control highway cracks and prevent further disease expansion, various crack repair materials and technologies have been developed in recent years. Among them, anti-cracking mortar, as an important repair material, is widely used in highway crack repair and reinforcement engineering. Anti-cracking mortar is a special mortar material with high tensile strength, good flexibility and bonding properties. Through reasonable proportioning design, anti-cracking mortar can maintain a certain rigidity while having a certain deformation adaptability, thereby effectively resisting the expansion of cracks.

[0004] However, there are still some technical problems to be solved in the prior art. For example, the traditional anti-cracking mortar material is prone to brittle cracking in low-temperature environments, and may appear softening or flowing phenomenon under high-temperature conditions, and has limited ability to adapt to complex temperature changes; in addition, the bonding strength between some materials and the original concrete base material is insufficient, which can easily cause the repair layer to fall off or peel off; at the same time, the base treatment requirements during construction are relatively high, and the construction efficiency is low, which affects the engineering progress. SUMMARY

[0005] To sum up, developing a new type of anti-cracking mortar with better anti-cracking performance, good adhesion, wide temperature range adaptability and convenient construction has become a technical problem to be solved in the field of current highway maintenance engineering. Through in-depth research in the technical field, the applicant finally proposes an anti-cracking mortar for repairing highway cracks and a preparation method thereof. The anti-cracking mortar prepared finally not only has more excellent anti-cracking performance, but also can simultaneously have good adhesion, excellent adaptability and weather resistance in high and low temperature environments, excellent salt corrosion resistance, excellent service life and reduced maintenance frequency, meeting the comprehensive performance requirements of the existing highway maintenance engineering for the repairing anti-cracking mortar.

[0006] An anti-cracking mortar for repairing highway cracks, by mass parts, raw materials include: gel material 90-130 parts, composite reinforcing agent 10-20 parts, aggregate 120-180 parts, polymer auxiliary agent 5-15 parts, propylene glycol 2-10 parts, water reducing agent 0.3-0.8 parts, retarder 0.3-0.6 parts, defoaming agent 0.3-1 parts, hydrophobic agent 1-2 parts, combined adjuvant 1.5-5 parts, and water 20-40 parts.

[0007] In a preferred embodiment, the gel material is at least one of sulphoaluminate cement, Portland cement, aluminate cement and magnesium phosphate cement.

[0008] In a preferred embodiment, the gel material is sulphoaluminate cement or Portland cement.

[0009] In a preferred embodiment, the gel material is fast-hardening sulphoaluminate cement.

[0010] In a preferred embodiment, the mass ratio of the gel material, the composite reinforcing agent and the polymer auxiliary agent is (95-115):(12-18):(8-14).

[0011] In a preferred embodiment, the mass ratio of the gel material, the composite reinforcing agent and the polymer auxiliary agent is (100-105):(13-16):(10-12).

[0012] In a preferred embodiment, the mass ratio of the gel material and the aggregate is (95-115):(140-175).

[0013] In a preferred embodiment, the mass ratio of the gel material and the aggregate is (100-105):(150-160).

[0014] In a preferred embodiment, the composite reinforcing agent is a composition of polyether sulfone, 3-mercaptopropyl trimethoxysilane and calcium fluoride whisker.

[0015] In a preferred embodiment, the mass ratio of the polyether sulfone, 3-mercaptopropyl trimethoxysilane and calcium fluoride whisker is (4-5):(1-2):(0.3-0.9).

[0016] In a preferred embodiment, the mass ratio of the polyether sulfone, 3-mercaptopropyl trimethoxysilane and calcium fluoride whisker is (4.2-4.4):(1.6-1.9):(0.6-0.8).

[0017] The composite reinforcing agent added in the application takes polyether sulfone as a temperature-resistant skeleton core. The aralkyl ether bond in the molecular chain thereof maintains stable conformation in high and low temperature environments, reduces the elastic modulus attenuation at high temperature, and significantly inhibits the thermal softening deformation of the repair body. In a low temperature environment, the rigid segment thereof forms a hydrogen bond crosslinking network with the thiol group of the flexible 3-mercaptopropyl trimethoxysilane, improves the mechanical properties, and the mercapto silane also acts on the interface molecular bridging, is combined with the cement hydration product through a covalent bond, and the thiol group is chemically bonded with the unsaturated active components in the old asphalt pavement, greatly enhances the adhesion, and finally the calcium fluoride whisker serves as a microcrack interceptor. When the crack expands to the whisker, the crack tip stress is dissipated through the whisker pullout work and interface slip, thereby greatly improving the overall comprehensive performance of the anti-cracking mortar.

[0018] In a preferred embodiment, the aggregate is at least one of graded quartz sand, bauxite, steel slag powder and machine-made sand.

[0019] In a preferred embodiment, the aggregate is graded quartz sand or machine-made sand.

[0020] In a preferred embodiment, the aggregate is graded quartz sand.

[0021] In a preferred embodiment, the average particle size of the graded quartz sand is 0.08-0.35 mm.

[0022] In a preferred embodiment, the polymer auxiliary agent is at least one of vinyl acetate-ethylene copolymer, acrylate-styrene copolymer, epoxy modified acrylic acid and polyurethane emulsion.

[0023] In a preferred embodiment, the polymer auxiliary agent is acrylate-styrene copolymer.

[0024] In a preferred embodiment, the water reducing agent is at least one of polycarboxylic acid superplasticizer, aminosulfonate water reducing agent, aliphatic hydroxyl sulfonate and naphthalene series water reducing agent.

[0025] In a preferred embodiment, the water reducing agent is polycarboxylic acid superplasticizer or aminosulfonate water reducing agent.

[0026] In a preferred embodiment, the water reducing agent is polycarboxylic acid superplasticizer.

[0027] In a preferred embodiment, the retarder is a combination of sodium gluconate and tetrasodium ethylenediaminetetraacetate.

[0028] In a preferred embodiment, the mass ratio of the sodium gluconate and tetrasodium ethylenediaminetetraacetate is (3~5):(0.8~1).

[0029] In a preferred embodiment, the mass ratio of the sodium gluconate and tetrasodium ethylenediaminetetraacetate is 4:1.

[0030] In a preferred embodiment, the defoaming agent is at least one of a silicone defoaming agent, a mineral oil complex, and a polyoxypropylene glycerol ether.

[0031] In a preferred embodiment, the defoaming agent is any one of a silicone defoaming agent.

[0032] In a preferred embodiment, the water repellent agent is at least one of calcium stearate, a silicone resin, a fluorocarbon active, and a paraffin wax microemulsion.

[0033] In a preferred embodiment, the water repellent agent is a combination of calcium stearate and a paraffin wax microemulsion.

[0034] In a preferred embodiment, the mass ratio of the calcium stearate and the paraffin wax microemulsion is (3~4):(1~1.2).

[0035] In a preferred embodiment, the mass ratio of the calcium stearate and the paraffin wax microemulsion is 3.5:1.

[0036] In a preferred embodiment, the mass ratio of the gel material and the combined adjuvant is (95~115):(3~4.5).

[0037] In a preferred embodiment, the mass ratio of the gel material and the combined adjuvant is (100~105):(3.5~4).

[0038] In a preferred embodiment, the combined adjuvant is a combination of N,N'-diisopropyl-p-nitrosoaniline, tetrasodium hydroxy-ethylidene diphosphonate, and oleic acid diethanolamine ester.

[0039] In a preferred embodiment, the mass ratio of the N,N'-diisopropyl-p-nitrosoaniline, tetrasodium hydroxy-ethylidene diphosphonate, and oleic acid diethanolamine ester is (1.5~3):(2~4):(10~12).

[0040] In a preferred embodiment, the mass ratio of the N,N'-diisopropyl-p-nitrosoaniline, tetrasodium hydroxy-ethylidene diphosphonate, and oleic acid diethanolamine ester is (2~2.5):(3.3~3.6):(11~12).

[0041] By combining the nitrosoaniline in the auxiliary agent as a low-temperature curing accelerator, the nitroso group stimulates the low-temperature hydration reaction of the sulphoaluminate cement to promote curing, while avoiding early ice crystal damage, and the high-efficiency chelating ability of the phosphonic acid group of the tetrasodium ethylendiamine-olysodium-methylene-phosphonate regulates the morphology of the mortar, inhibits the generation of needle-shaped structures, reduces the expansion stress to eliminate the micro-crack source of the repair body, and finally, the diethanolamine oleate ester is used as an interfacial toughening medium, which forms a coordination bond through the Ca-O bond between the diethanolamine group and the cement hydration product C-S-H gel, and the long-chain alkane is arranged in the direction of the crack interface to form a hydrophobic film, which together improves the comprehensive performance of the mortar.

[0042] A preparation method of the above-mentioned anti-cracking mortar for highway crack repair, comprising the following steps: S1: mixing the composite reinforcing agent with propylene glycol, ultrasonic dispersion, then heating and stirring in a sealed container for 22-24h to obtain a premix; S2: mixing the gel material, aggregate, water, water reducing agent, retarder, and 50wt% defoaming agent, then adding the premix and the remaining raw materials, and stirring with an anchor stirrer at 500-600rpm for 10-13min to obtain a mixed slurry; S3: stirring and defoaming the mixed slurry under a vacuum degree of -0.095MPa, and then standing at room temperature to obtain the anti-cracking mortar for highway crack repair.

[0043] In a preferred embodiment, the preparation method of the anti-cracking mortar for highway crack repair specifically comprises the following steps: S1: mixing the composite reinforcing agent with propylene glycol, first ultrasonic dispersion at 30-40kHz and 500-600W for 15-20min, then heating and stirring at 200-300rpm and 70-75℃ for 20-25min, transferring to a sealed container, and aging at 35-40℃ for 22-24h to obtain a premix; S2: mixing the gel material, aggregate, water, water reducing agent, retarder, and 50wt% defoaming agent at 600-800rpm for 8-12min, then adding the premix and the remaining raw materials, and stirring with an anchor stirrer at 500-600rpm for 10-13min to obtain a mixed slurry; S3: stirring the mixed slurry at 150-200rpm under a vacuum degree of -0.095MPa for 10-15min, and then standing at a constant temperature of 24-26℃ for 0.5-1h to obtain the anti-cracking mortar for highway crack repair.

[0044] The present application has practical significance and beneficial effects:

[0045] 1、The anti-cracking mortar for highway crack repair prepared in the present application not only has more excellent anti-cracking performance, but also can simultaneously maintain good adhesion, and has excellent adaptability, weather resistance, salt corrosion resistance, and excellent service life under high and low temperature environments, reduces maintenance frequency, and meets the comprehensive performance requirements of existing highway maintenance engineering for repair anti-cracking mortar.

[0046] 2. This application uses polyethersulfone as the core of the heat-resistant skeleton by adding a composite reinforcing agent. The aromatic ether bonds in its molecular chain maintain a stable conformation in high and low temperature environments, thereby enhancing the heat resistance of the mortar. The thiol group of 3-mercaptopropyltrimethoxysilane forms a hydrogen bond cross-linking network to improve the mechanical properties. The mercaptosilane also acts as an interface molecular bridging agent, combining with cement hydration products through covalent bonds. At the same time, the thiol group chemically bonds with the unsaturated active components in the old asphalt pavement, greatly enhancing the adhesion.

[0047] 3. The present application further adds a combination of additives, using nitrosoaniline as a low-temperature curing accelerator. Its nitroso group stimulates the low-temperature hydration reaction of sulfoaluminate cement to promote curing, while avoiding early ice crystal damage. It cooperates with the efficient chelating ability of the phosphonic acid group of tetrasodium hydroxyethylidene diphosphonate to regulate the mortar morphology, inhibit the formation of needle-like structures, reduce expansion stress and eliminate the source of microcracks in the repair body. Finally, diethanolamine oleate is used as an interface toughening medium. The diethanolamine group forms a coordination bond with the Ca-O bond of the cement hydration product CSH gel, and the long-chain alkanes are directionally arranged at the crack interface to form a hydrophobic film. The dual mechanisms jointly improve the comprehensive performance of the mortar. DETAILED DESCRIPTION

[0048] Example 1

[0049] The invention discloses an anti-cracking mortar for repairing cracks in highways. The raw materials include, by weight, 104.5 parts of gel material, 14.8 parts of composite reinforcing agent, 155 parts of aggregate, 11.5 parts of polymer auxiliary agent, 6 parts of propylene glycol, 0.5 part of water reducer, 0.4 part of retarder, 0.5 part of defoaming agent, 1.2 parts of hydrophobic agent, 3.8 parts of combination auxiliary agent and 28.5 parts of water.

[0050] The gel material is fast-hardening sulphoaluminate cement, which comes from Hubei Zhongnan Road and Bridge Company, China.

[0051] The composite reinforcing agent is a composition of polyethersulfone, 3-mercaptopropyltrimethoxysilane and calcium fluoride whisker, with a mass ratio of 4.2:1.6:0.7.

[0052] Polyethersulfone E2010, from BASF, Germany.

[0053] The aggregate is graded quartz sand with an average particle size of 0.35 mm.

[0054] The polymer auxiliary agent is acrylate-styrene copolymer S-760, which is from BASF, Germany.

[0055] The water reducer is a polycarboxylic acid high-efficiency water reducer with a water reduction rate of 25%, which comes from Shenyang Xingzhenghe Chemical, China.

[0056] The retarder is a combination of sodium gluconate and tetrasodium EDTA, with a mass ratio of 4:1.

[0057] The defoaming agent is a silicone defoaming agent BYK-1790.

[0058] The hydrophobic agent is a composition of calcium stearate and paraffin wax microemulsion, with a mass ratio of 3.5:1.

[0059] The combined additive is a composition of N,N'-diisopropyl p-nitrosophenylamine, tetrasodium hydroxyethylidene diphosphonate and oleic acid diethanolamine ester, with a mass ratio of 2.5:3.5:12.

[0060] A preparation method of the above-mentioned anti-cracking mortar for highway crack repair, specifically comprising the following steps: S1: mixing the composite reinforcing agent with propylene glycol, first ultrasonic at 40 kHz, 500 W for 20 min, then heat and stir at 250 rpm, 70°C for 20 min, transfer to a sealed container, and mature at 40°C for 24 h to obtain a premix; S2: dry mixing the gel material and the aggregate at 400 rpm for 8 min, then adding water, a water reducing agent, a retarder, 50 wt% of a defoaming agent, mixing at 600 rpm for 10 min, then adding the premix and the remaining raw materials, and stirring with an anchor stirrer at 500 rpm for 12 min to obtain a mixed slurry; and S3: stirring the mixed slurry at 180 rpm under a vacuum degree of -0.095 MPa for 12 min, and then standing in a constant-temperature room at 25°C for 0.8 h to obtain the anti-cracking mortar for highway crack repair.

[0061] Example 2

[0062] This example is different from example 1 only in that: the anti-cracking mortar for highway crack repair comprises, by mass fraction: a gel material 98 parts, a composite reinforcing agent 16.5 parts, an aggregate 155 parts, a polymer auxiliary agent 8.8 parts, propylene glycol 8.5 parts, a water reducing agent 0.6 parts, a retarder 0.5 parts, a defoaming agent 0.4 parts, a hydrophobic agent 1.1 parts, a combined additive 3.2 parts, and water 30.5 parts.

[0063] The other embodiments are the same.

[0064] Example 3

[0065] This example is different from example 1 only in that: the anti-cracking mortar for highway crack repair comprises, by mass fraction: a gel material 115 parts, a composite reinforcing agent 12.8 parts, an aggregate 165 parts, a polymer auxiliary agent 13.5 parts, propylene glycol 7.5 parts, a water reducing agent 0.5 parts, a retarder 0.4 parts, a defoaming agent 0.5 parts, a hydrophobic agent 1.2 parts, a combined additive 4.2 parts, and water 29.5 parts.

[0066] The other embodiments are the same.

[0067] Comparative Example 1

[0068] The comparative example 1 is identical to example 1 except that the anti-cracking mortar for repairing highway cracks comprises, by mass parts: gel material 130 parts, composite reinforcing agent 5.8 parts, aggregate 188 parts, polymer auxiliary agent 11.5 parts, propylene glycol 6 parts, water reducing agent 0.6 parts, retarder 0.4 parts, defoaming agent 0.5 parts, hydrophobic agent 1.2 parts, combined auxiliary agent 5.5 parts, and water 28.5 parts.

[0069] The other embodiments are identical.

[0070] Comparative example 2

[0071] The comparative example 2 is identical to example 1 except that the anti-cracking mortar for repairing highway cracks comprises, by mass parts: gel material 125 parts, composite reinforcing agent 18.5 parts, aggregate 155 parts, polymer auxiliary agent 2.5 parts, propylene glycol 6 parts, water reducing agent 0.5 parts, retarder 0.4 parts, defoaming agent 0.5 parts, hydrophobic agent 1.2 parts, combined auxiliary agent 4.5 parts, and water 28.5 parts.

[0072] The other embodiments are identical.

[0073] Comparative example 3

[0074] The comparative example 3 is identical to example 1 except that the anti-cracking mortar for repairing highway cracks comprises, by mass parts: gel material 104.5 parts, composite reinforcing agent 14.8 parts, aggregate 155 parts, polymer auxiliary agent 11.5 parts, propylene glycol 6 parts, water reducing agent 0.5 parts, retarder 0.4 parts, defoaming agent 0.5 parts, hydrophobic agent 1.2 parts, combined auxiliary agent 1.2 parts, and water 28.5 parts.

[0075] The other embodiments are identical.

[0076] Comparative example 4

[0077] The comparative example 4 is identical to example 1 except that the composite reinforcing agent is a combination of polyether sulfone, 3-mercaptopropyl trimethoxysilane, and calcium fluoride whisker in a mass ratio of 6.8:0.5:0.2.

[0078] The other embodiments are identical.

[0079] Comparative example 5

[0080] The comparative example 5 is identical to example 1 except that the composite reinforcing agent is a combination of polyether sulfone, 3-mercaptopropyl trimethoxysilane, and calcium fluoride whisker in a mass ratio of 2:4:1.5.

[0081] The other embodiments are identical.

[0082] Comparative example 6

[0083] The comparative example is identical to example 1 except that the combination of additives is a combination of N,N'-diisopropyl-p-nitrosoaniline, tetrasodium hydroxy- ethylidene diphosphonate and oleic acid diethanolamine ester in a mass ratio of 5:1:6.

[0084] The further embodiments are identical.

[0085] Comparative example 7

[0086] The comparative example is identical to example 1 except that the combination of additives is a combination of N,N'-diisopropyl-p-nitrosoaniline, tetrasodium hydroxy- ethylidene diphosphonate and oleic acid diethanolamine ester in a mass ratio of 1:5:20.

[0087] The further embodiments are identical.

[0088] Performance test

[0089] 1. Crack resistance: sample size: 40x40x160mm mortar specimen, after 28 days of standard curing, a 2mm wide precast crack is made in the center, three-point bending loading (span 100mm), loading rate 0.5mm / min, test conditions: 25℃±1℃, RH 50%±5%, record the energy consumed when the crack expands to complete fracture, the result is the average of 10 tests, which is entered into Table 1.

[0090] 2. Erosion resistance: refer to standard T0582-2020, sample size: 100mmx100mmx100mm cubic specimen, curing conditions: standard curing for 28d, erosion solution: 5% Na2SO4 solution, cycle parameters: soaking: 65℃±5℃ for 15h, drying: 65℃±5℃ for 3h, cycle times: 30 times, take the mass loss rate, the result is the average of 10 tests, which is entered into Table 1.

[0091] 3. Adhesion: refer to standard GB / T 5210-2006, on the old asphalt concrete plate with standard curing, size 150x150x50mm, roughness Ra≈1mm, surface opening diameter 60mm hole, fill the anti-cracking mortar to be tested of example and comparative example, insert the standard pull head with a diameter of 50mm, 20℃±2℃, RH≥95%, after 7 days of standard curing, use hydraulic pull tester to load at a rate of 0.5MPa / s until failure, calculate the positive pull adhesion strength, the result is the average of 10 tests, which is entered into Table 1.

[0092] 4. Temperature resistance: refer to standard GB / T 17671-2021, 40x40x160mm mortar specimen, the specimen is cycled 50 times in the range of -40℃ (2h)→100℃ (2h), take the retention rate of flexural strength after cycling, the result is the average of 10 tests, which is entered into Table 1.

[0093] Table 1 Performance test result table

[0094]

[0095] From the final performance test results of the examples and comparative examples, comparative examples 1-3 did not use appropriate amounts of composite reinforcing agents and combination of auxiliary materials and other raw materials, which led to a significant decrease in their own effects and synergies between them, thereby reducing their respective performance effects in the overall mortar material system, ultimately resulting in a significant deviation in the effect, leading to a significant decrease in the performance of the anti-cracking mortar prepared compared to examples 1-3.

[0096] Comparative examples 4-7, respectively, did not use the appropriate raw material compounding ratio, type and specification defined in the present application, which led to the corresponding effects not being fully realized in the cement gel material, resulting in a significant decrease in the effect, reducing the efficiency of mutual interaction, and also obtaining poorer performance results.

Claims

1. An anti-crack mortar for repairing road cracks, characterized by: The raw materials include, by mass: 90-130 parts of gel material, 10-20 parts of composite reinforcing agent, 120-180 parts of aggregate, 5-15 parts of polymer auxiliary agent, 2-10 parts of propylene glycol, 0.3-0.8 parts of water reducer, 0.3-0.6 parts of retarder, 0.3-1 parts of defoaming agent, 1-2 parts of water repellent, 1.5-5 parts of combined auxiliary agent, and 20-40 parts of water; The composite reinforcing agent is a composition of polyethersulfone, 3-mercaptopropyltrimethoxysilane and calcium fluoride whiskers, with a mass ratio of (4-5): (1-2): (0.3-0.9); The retarder is a composition of sodium gluconate and tetrasodium EDTA, with a mass ratio of (3-5): (0.8-1); The combined auxiliary agent is a composition of N,N'-diisopropyl-p-nitrosoaniline, tetrasodium hydroxyethylidene diphosphonate and diethanolamine oleate, with a mass ratio of (1.5-3): (2-4): (10-12); The polymer adjuvant is an acrylate-styrene copolymer; The gel material is at least one of sulphoaluminate cement, silicate cement, aluminate cement and magnesium phosphate cement.

2. The anti-crack mortar for repairing road cracks according to claim 1, characterized in that: The mass ratio of the gel material, the composite reinforcing agent and the polymer auxiliary agent is (95-115): (12-18): (8-14).

3. The anti-crack mortar for repairing road cracks according to claim 2, characterized in that: The mass ratio of the gel material to the aggregate is (95-115): (140-175).

4. The anti-crack mortar for repairing road cracks according to claim 3, characterized in that: The mass ratio of the gel material to the combined auxiliary agent is (95-115): (3-4.5).

5. The anti-crack mortar for repairing road cracks according to claim 4, characterized in that: The aggregate is at least one of graded quartz sand, bauxite, steel slag powder and machine-made sand.

6. The anti-crack mortar for repairing road cracks according to claim 5, characterized in that: The hydrophobic agent is at least one of calcium stearate, silicone resin, fluorocarbon active material and paraffin microemulsion.

7. The anti-crack mortar for repairing road cracks according to claim 6, characterized in that: The water reducer is at least one of a polycarboxylic acid high-efficiency water reducer, an aminosulfonate water reducer, an aliphatic hydroxysulfonate and a naphthalene water reducer.

8. The anti-crack mortar for repairing road cracks according to claim 7, characterized in that: The hydrophobic agent is a composition of calcium stearate and paraffin microemulsion, with a mass ratio of (3-4): (1-1.2).

9. A method for preparing the anti-crack mortar for repairing road cracks according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Mix the composite reinforcing agent and propylene glycol, disperse them by ultrasonication, then heat and stir them, transfer them to a sealed container, and mature them for 22-24 hours to obtain a premix; S2: Dry-mix the gel material and aggregate, then add water, water reducer, retarder, and 50 wt% defoamer, then add the premix and the remaining raw materials, and stir with an anchor stirrer at 500-600 rpm for 10-13 minutes to obtain a mixed slurry; S3: Stir the mixed slurry to defoam under a vacuum of -0.095 MPa, and then let it stand in a constant temperature chamber at room temperature to obtain the slurry.

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