Water-resistant cold patch material containing milled material

Abstract

The present application relates to the technical field of road surface pit repair material, and particularly relates to a water-resistant pit repair cold patch material containing milling material, which comprises, in terms of weight parts, 40-60 parts of asphalt concrete road surface milling material, 10-30 parts of cement, 1-3 parts of cement thickening agent, 10-20 parts of stone material, 10-20 parts of sand material, 25-40 parts of water, 3-5 parts of binder, 0.1-0.2 parts of anti-cracking fiber, 0.1-1 parts of color enhancer and 0.5-2 parts of lubricant. The present application mills part of the original road surface of the road surface to be repaired, and uses the crushed material as aggregate to cooperate with other components to produce the cold patch material, which can recycle the waste material in the maintenance of the asphalt road surface, and reduces the demand for new material mining in the maintenance process. The present application adopts the cold construction technology on site, and greatly reduces the energy consumption and the environmental pollution compared with the hot-mixed asphalt and the warm-mixed asphalt, and achieves the purpose of resource saving, energy saving and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of road pothole repair materials, and in particular to a water-resistant cold patching material for pothole repair containing milled material. Background Technology

[0002] With the rapid development of transportation, the national expressway network has been basically completed. However, during long-term use, asphalt pavements will develop defects such as reflective cracks, stress cracks, temperature shrinkage cracks, potholes, or damage due to a series of reasons such as surface aging, reflective cracks in the base layer, rain and snow erosion and freeze-thaw cycles, and poor interlayer bonding. These defects greatly affect the service life of asphalt pavements and increase driving safety hazards. Therefore, it is necessary to treat pavement defects in a timely manner.

[0003] In existing technologies, asphalt pavement repair materials mainly include traditional hot patching materials and traditional cold patching materials. Traditional hot patching materials require heating the asphalt mixture during application, consuming a large amount of energy. Furthermore, a significant temperature difference exists between the damaged area and the newly applied asphalt mixture; under heavy vehicle traffic, the old and new materials can separate, causing further cracking. Traditional cold patching materials are characterized by easy compaction, readily available use, convenient storage, and simple operation, enabling rapid repairs. However, the principle behind traditional cold patching materials is that they gradually develop strength as diesel fuel evaporates. During this process, if water, such as rainwater, is encountered, the strength is not fully developed, and moisture can easily penetrate the cold patching material, causing asphalt to separate from the aggregate, resulting in water damage, wasted cold patching materials, and unsatisfactory pavement repair results.

[0004] Existing research and practice on cold patching materials using milled materials mainly focus on the proportioning and design of cold patching materials, construction process and quality control, while there is less research on the performance and strength development mechanism of cold patching materials. As a result, some problems such as insufficient durability, pavement cracking and loosening appear quickly after the road is put into use, causing economic waste and adverse social impact.

[0005] Therefore, it is necessary to develop a water-resistant cold patch material for pothole repair that contains milling material, has good toughness and durability, and can repair potholes on the road surface at room temperature. Summary of the Invention

[0006] This invention aims to solve the above-mentioned problems and provides a water-resistant cold patching compound for repairing potholes containing milling material. The specific technical solution is as follows:

[0007] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 40-60 parts milled material for asphalt concrete pavement, 10-30 parts cement, 1-3 parts cement thickener, 30-40 parts aggregate, 10-20 parts sand, 35-40 parts water, 3-5 parts binder, 0.1-0.2 parts crack-resistant fiber, 0.1-1 parts colorant, and 0.5-2 parts lubricant.

[0008] The preferred embodiment is a water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, 0.3 parts crack-resistant fiber, 5 parts binder, and 2 parts lubricant.

[0009] Preferably, the asphalt concrete pavement milling material refers to the mixture obtained by scraping off a layer of damaged asphalt concrete pavement with a milling machine. The asphalt content in the asphalt concrete pavement milling material shall not be less than 3.0%. Using asphalt concrete pavement milling material to prepare repair materials can greatly save resources and reduce material waste.

[0010] Based on the above technical solution, the asphalt concrete pavement milling material can be any one of matrix asphalt pavement milling material, modified asphalt pavement milling material, and rubber asphalt pavement milling material.

[0011] Based on the above technical solution, the asphalt content in the milled asphalt concrete pavement material is not less than 3.0%.

[0012] Based on the above technical solution, the cement is any one of phosphate cement, high-alumina cement, bauxite cement, and aluminate cement.

[0013] Based on the above technical solution, the cement thickener is any one of carboxymethyl cellulose, hydroxypropyl methyl cellulose, and hydroxyethyl cellulose. More preferably, the cement thickener is hydroxyethyl cellulose. Hydroxyethyl cellulose can improve the viscosity and fluidity of cement, thereby reducing the amount of cement used and improving the crack resistance of cold-mixed cementitious materials.

[0014] Based on the above technical solution, the adhesive comprises epoxy resin and polyurethane.

[0015] The adhesive helps ensure that the repair interface does not shift or crack, and improving the bonding strength of the repair interface is beneficial to improving bonding performance and resistance to water damage. The epoxy resin has good bonding performance to various materials and can be used as a structural adhesive. This invention uses bisphenol A type E-51 epoxy resin, which has high resin strength, good bonding performance, and is economical and environmentally friendly.

[0016] Polyurethane is a commonly used polymer material. Polyurethane prepolymers contain flexible COC chains and flexible groups, exhibiting good toughness and low-temperature performance. Furthermore, they have good compatibility with epoxy resins. The combination of these two materials can reduce the brittleness of the adhesive and improve its flexibility. This invention preferably uses polyether-type polyurethane prepolymer 1090.

[0017] Based on the above technical solution, the crack-resistant fiber is any one or more of basalt fiber, lignin fiber, glass fiber, and nylon-polyester fiber. Preferably, the crack-resistant fiber is lignin fiber.

[0018] Crack-resistant fibers can be used as stabilizers in cold patch asphalt. The fibers not only have a good adsorption effect on asphalt, but also form a network of asphalt with free asphalt, enhancing the stability of the asphalt mixture and thus playing a role in crack resistance. The specific working principle is as follows:

[0019] (1) Adsorption. During the addition and dispersion of fibers into asphalt, due to their large specific surface area, fibers adsorb a significant amount of asphalt, forming an interfacial layer of a certain thickness. Within this layer, asphalt and fibers can undergo physicochemical reactions to form stable structural asphalt. Compared to free asphalt, structural asphalt has a higher viscosity; therefore, the addition of fibers can improve its high-temperature performance and durability.

[0020] (2) Stabilizing effect. After being mixed evenly, the fibers are randomly distributed in the asphalt and come into contact with each other to form a crisscrossing network. This network absorbs the nearby asphalt to form a mesh structure, which increases the cohesiveness of the asphalt mortar, reduces the fluidity of the asphalt, and achieves the purpose of enhancing the overall stability of the cold patch material.

[0021] (3) Crack resistance and fatigue resistance. Because the fibers are randomly distributed in the asphalt and their wide distribution can form a network structure, they can effectively inhibit the development of cracks when cracks appear in the asphalt mixture. Fatigue cracking of asphalt concrete pavement is usually caused by tiny cracks. The presence of fibers can inhibit the development of cracks, thereby improving the fatigue resistance of asphalt pavement.

[0022] Based on the above technical solution, the color enhancer is ferric oxide powder, which can adjust the color of cold-mixed materials, increase the activity of the system, and enhance the anti-aging performance of the system.

[0023] Based on the above technical solution, the lubricant is oil residue. Oil residue is an oily substance rich in phosphorus and other elements. In cold-mixed compound, it mainly plays a role in isolation and lubrication. After molding, the compound has high strength and water resistance.

[0024] Based on the same invention, this invention also provides a method for preparing a water-resistant cold patching compound for pothole repair containing milling material, comprising the following steps:

[0025] S1. Prepare each ingredient according to its weight proportions;

[0026] S2. Mix the milled asphalt concrete pavement material, aggregate, sand, and crack-resistant fiber evenly to obtain the initial mixture;

[0027] S3. Add water, cement, cement thickener, interface binder, curing agent, ferric oxide powder, lubricant, etc. to the initial mixture obtained in S2 and stir and mix at room temperature to obtain a mixture. Turn it over and press it to obtain a water-resistant cold patch material for repairing potholes containing milling material.

[0028] The present invention has the following advantages:

[0029] 1. This invention involves milling a portion of the base and surface layers of the existing road surface that needs repair, using the resulting fragments as aggregate, and combining them with other components to create a cold patch material. This allows for the recycling of waste materials during asphalt pavement maintenance and repair, reducing the need for mining new materials during the repair process.

[0030] 2. This invention adopts on-site cold construction technology, which greatly reduces energy consumption and environmental pollution compared with hot-mix asphalt and warm-mix asphalt, and achieves the purpose of resource conservation, energy saving and environmental protection.

[0031] 3. This invention studies and analyzes the effects of four types of crack-resistant fibers and their combinations on cold patching materials, and studies and obtains the most suitable crack-resistant fiber composition and ratio for cold patching materials. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the embodiments and comparative examples: The raw materials used in the embodiments of the present invention can all be obtained commercially.

[0033] Example 1:

[0034] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 40 parts milled material for asphalt concrete pavement, 30 parts cement, 20 parts aggregate, 15 parts sand, 40 parts water, and 0.5 parts colorant.

[0035] The preparation method is as follows:

[0036] S1. Prepare each ingredient according to its weight proportions;

[0037] S2. Mix the milled asphalt concrete pavement material, stone, and sand evenly to obtain the initial mixture.

[0038] S3. Add water, cement, colorant, etc. to the initial mixture obtained in S2 and stir and mix at room temperature to obtain a mixture. Turn it over and press it to obtain a water-resistant cold patch material for repairing potholes containing milling material.

[0039] Example 2:

[0040] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 30 parts cement, 15 parts aggregate, 15 parts sand, 40 parts water, and 0.5 parts colorant.

[0041] The preparation method is the same as in Example 1.

[0042] Example 3:

[0043] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 60 parts milled material for asphalt concrete pavement, 30 parts cement, 10 parts aggregate, 15 parts sand, 40 parts water, and 0.5 parts colorant.

[0044] The preparation method is the same as in Example 1.

[0045] Example 4:

[0046] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 30 parts cement, 15 parts aggregate, 15 parts sand, 40 parts water, 0.5 parts colorant, and 1 part cement thickener. The cement thickener is hydroxyethyl cellulose.

[0047] The preparation method is as follows:

[0048] S1. Prepare each ingredient according to its weight proportions;

[0049] S2. Mix the milled asphalt concrete pavement material, stone, and sand evenly to obtain the initial mixture.

[0050] S3. Add water, cement, cement thickener, colorant, etc. to the initial mixture obtained in S2 and stir and mix at room temperature to obtain a mixture. Turn it over and press it to obtain a water-resistant cold patch material for repairing potholes containing milling material.

[0051] Example 5:

[0052] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts asphalt concrete pavement milled material, 20 parts cement, 15 parts aggregate, 15 parts sand, 35 parts water, 0.5 parts colorant, and 2 parts cement thickener. The cement thickener is hydroxyethyl cellulose.

[0053] The preparation method is the same as in Example 4.

[0054] Example 6:

[0055] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, and 3 parts cement thickener. The cement thickener is hydroxyethyl cellulose.

[0056] The preparation method is the same as in Example 4.

[0057] Example 7:

[0058] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, and 0.2 parts crack-resistant fiber. The cement thickener is hydroxyethyl cellulose, and the crack-resistant fiber is basalt fiber.

[0059] The preparation method is as follows:

[0060] S1. Prepare each ingredient according to its weight proportions;

[0061] S2. Mix the milled asphalt concrete pavement material, aggregate, sand, and crack-resistant fiber evenly to obtain the initial mixture;

[0062] S3. Add water, cement, cement thickener, colorant, etc. to the initial mixture obtained in S2 and stir and mix at room temperature to obtain a mixture. Turn it over and press it to obtain a water-resistant cold patch material for repairing potholes containing milling material.

[0063] Example 8:

[0064] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, and 0.2 parts crack-resistant fiber. The cement thickener is hydroxyethyl cellulose, and the crack-resistant fiber is lignin fiber.

[0065] The preparation method is the same as in Example 7.

[0066] Example 9:

[0067] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, and 0.2 parts crack-resistant fiber. The cement thickener is hydroxyethyl cellulose, and the crack-resistant fiber is glass fiber.

[0068] The preparation method is the same as in Example 7.

[0069] Example 10:

[0070] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, and 0.2 parts crack-resistant fiber. The cement thickener is hydroxyethyl cellulose, and the crack-resistant fiber is nylon-polyester fiber.

[0071] The preparation method is the same as in Example 7.

[0072] Example 11:

[0073] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, and 0.3 parts crack-resistant fiber. The cement thickener is hydroxyethyl cellulose, and the crack-resistant fiber is 0.2 parts basalt fiber and 0.1 parts lignin fiber.

[0074] The preparation method is the same as in Example 7.

[0075] Example 12:

[0076] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, and 0.3 parts crack-resistant fiber. The cement thickener is hydroxyethyl cellulose, and the crack-resistant fiber is 0.3 parts lignin fiber.

[0077] The preparation method is the same as in Example 7.

[0078] Example 13:

[0079] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, and 0.3 parts crack-resistant fiber. The cement thickener is hydroxyethyl cellulose, and the crack-resistant fiber is 0.2 parts glass fiber and 0.1 parts lignin fiber.

[0080] The preparation method is the same as in Example 7.

[0081] Example 14:

[0082] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, and 0.3 parts crack-resistant fiber. The cement thickener is hydroxyethyl cellulose, and the crack-resistant fiber is 0.2 parts nylon-polyester fiber and 0.1 parts lignin fiber.

[0083] The preparation method is the same as in Example 7.

[0084] Example 15:

[0085] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, 0.3 parts crack-resistant fiber, and 3 parts binder. The cement thickener is hydroxyethyl cellulose, the crack-resistant fiber is 0.2 parts nylon-polyester fiber and 0.1 parts lignin fiber, and the binder comprises epoxy resin and polyurethane.

[0086] The preparation method is as follows:

[0087] S1. Prepare each ingredient according to its weight proportions;

[0088] S2. Mix the milled asphalt concrete pavement material, aggregate, sand, and crack-resistant fiber evenly to obtain the initial mixture;

[0089] S3. Add water, cement, cement thickener, colorant, binder, etc. to the initial mixture obtained in S2 and stir and mix at room temperature to obtain a mixture. Turn it over and press it to obtain a water-resistant cold patch material for repairing potholes containing milling material.

[0090] Example 16:

[0091] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, 0.3 parts crack-resistant fiber, and 4 parts binder. The cement thickener is hydroxyethyl cellulose, the crack-resistant fiber is 0.2 parts nylon-polyester fiber and 0.1 parts lignin fiber, and the binder comprises epoxy resin and polyurethane.

[0092] The preparation method is the same as in Example 15.

[0093] Example 17:

[0094] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, 0.3 parts crack-resistant fiber, and 5 parts binder. The cement thickener is hydroxyethyl cellulose, the crack-resistant fiber is 0.2 parts nylon-polyester fiber and 0.1 parts lignin fiber, and the binder comprises epoxy resin and polyurethane.

[0095] The preparation method is the same as in Example 15.

[0096] Example 18:

[0097] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, 0.3 parts crack-resistant fiber, 5 parts binder, and 0.5 parts lubricant. The cement thickener is hydroxyethyl cellulose, the crack-resistant fiber is 0.2 parts nylon-polyester fiber and 0.1 parts lignin fiber, the binder comprises epoxy resin and polyurethane, and the lubricant is oil residue.

[0098] The preparation method is as follows:

[0099] S1. Prepare each ingredient according to its weight proportions;

[0100] S2. Mix the milled asphalt concrete pavement material, aggregate, sand, and crack-resistant fiber evenly to obtain the initial mixture;

[0101] S3. Add water, cement, cement thickener, colorant, binder, lubricant, etc. to the initial mixture obtained in S2 and stir and mix at room temperature to obtain a mixture. Turn it over and press it to obtain a water-resistant cold patch material for repairing potholes containing milling material.

[0102] Example 19:

[0103] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, 0.3 parts crack-resistant fiber, 5 parts binder, and 1 part lubricant. The cement thickener is hydroxyethyl cellulose, the crack-resistant fiber is 0.2 parts nylon-polyester fiber and 0.1 parts lignin fiber, the binder comprises epoxy resin and polyurethane, and the lubricant is oil residue.

[0104] The preparation method is the same as in Example 18.

[0105] Example 20:

[0106] A water-resistant cold patching compound for pothole repair containing milled material, comprising, by weight: 50 parts milled material for asphalt concrete pavement, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, 0.3 parts crack-resistant fiber, 5 parts binder, and 2 parts lubricant. The cement thickener is hydroxyethyl cellulose, the crack-resistant fiber is 0.2 parts nylon-polyester fiber and 0.1 parts lignin fiber, the binder comprises epoxy resin and polyurethane, and the lubricant is oil residue.

[0107] The preparation method is the same as in Example 18.

[0108] Performance testing experiment

[0109] The following performance tests were conducted on the water-resistant pothole repair cold patch materials containing milled material prepared in Examples 1-20. Referring to the "Test Procedures for Cement and Cement Concrete in Highway Engineering" (JTG E30), the compressive strength and flexural strength of the asphalt pavement cold patch materials were tested. Simultaneously, the pull-out strength between the asphalt pavement cold patch material and the pavement being repaired was also tested. The testing time was 2 hours. Specific test results are shown in Table 1.

[0110] Table 1. Test results of cold-mixed material after 2 hours (unit: MPa)

[0111]

[0112]

[0113] Based on the analysis of the experimental data of Examples 1-20 in Table 1, the data of Examples 18-20 are significantly better than those of Examples 1-3 in terms of compressive strength, flexural strength and tensile strength.

[0114] In Examples 1-3, the proportions of milling material and aggregate for asphalt concrete pavement were screened. The experimental results showed that the proportion in Example 2 had a better overall effect. Therefore, subsequent experiments were based on Example 2 for optimization.

[0115] Examples 4-6, based on Example 2 and as a control, verified the effect and optimal dosage of cement thickener. The experimental data showed that adding only one part of cement thickener in Example 4 was significantly better than the effect of not adding cement thickener in Example 2. Examples 5 and 6 added 2 and 3 parts of cement additive respectively and reduced the amount of cement accordingly, but the final effect was significantly better than that of Example 2. The effect of Example 6 was better, so subsequent experiments were based on Example 6 for optimization.

[0116] Examples 7-14, based on Example 6 and as a control, verify the influence of the type and amount of crack-resistant fibers on cold patching materials, as well as the selection of proportions and amounts. Analysis of the experimental data from Examples 7-10 shows that the effects of single crack-resistant fibers are nylon-polyester fiber, basalt fiber, glass fiber, and lignin fiber, respectively. Comparing the experimental results of Examples 7-10 with Example 6 indicates that all four types of crack-resistant fibers enhance the performance of cold patching materials. Comparative analysis of the experimental data from Examples 7-10 and Examples 11-14 shows that the composite use of crack-resistant fibers significantly improves the overall performance of cold patching materials, with Example 14 showing the best effect. This example uses a combination of 0.2 parts nylon-polyester fiber and 0.1 parts lignin fiber as the crack-resistant fiber. Therefore, subsequent experiments were based on Example 14 for optimization.

[0117] Examples 15-17 are based on Example 14, with the addition of a binder, and the effects of different dosages on cold patching materials are verified. The experimental results show that Example 17 is more effective.

[0118] Examples 18-20 are based on the good cold patching performance of Example 17, with the addition of lubricant. Experimental data show that the lubricant has a significant effect on improving the performance of cold patching, especially in terms of flexural strength and tensile strength.

[0119] In summary, Example 20 represents the optimal cold patch material composition ratio, as follows: A water-resistant cold patch material for pothole repair containing milling material, comprising, by weight: 50 parts asphalt concrete pavement milling material, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, 0.3 parts crack-resistant fiber, 5 parts binder, and 2 parts lubricant.

[0120] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A water-resistant cold patching compound for repairing potholes containing milling material, characterized in that, By weight, it includes: 50 parts asphalt concrete pavement milling material, 15 parts cement, 15 parts aggregate, 15 parts sand, 25 parts water, 0.5 parts colorant, 3 parts cement thickener, 0.3 parts crack-resistant fiber, 5 parts binder, and 2 parts lubricant. The cement thickener is hydroxyethyl cellulose, and the crack-resistant fiber is nylon. The adhesive comprises 0.2 parts polyester fiber and 0.1 parts lignin fiber, the adhesive comprises epoxy resin and polyurethane, and the lubricant is oil foot.

2. The water-resistant cold patching compound for pothole repair containing milling material according to claim 1, characterized in that, The asphalt concrete pavement milling material can be any one of the following: base asphalt pavement milling material, modified asphalt pavement milling material, and rubber asphalt pavement milling material.

3. The water-resistant cold patching compound for pothole repair containing milling material according to claim 2, characterized in that, The asphalt content in the milled material for the asphalt concrete pavement shall not be less than 3.0%.

4. The water-resistant cold patching compound for pothole repair containing milling material according to claim 1, characterized in that, The cement is any one of phosphate cement, high-alumina cement, bauxite cement, and aluminate cement.

5. The water-resistant cold patching compound for pothole repair containing milling material according to claim 1, characterized in that, The colorant is iron(III) oxide powder.

6. A method for preparing a water-resistant cold patching compound for pothole repair containing milling material as described in claim 1, characterized in that, Includes the following steps: S1. Prepare each ingredient according to its weight proportions; S2. Mix the milled asphalt concrete pavement material, aggregate, sand, and crack-resistant fiber evenly to obtain the initial mixture; S3. Add water, cement, cement thickener, binder, colorant and lubricant to the initial mixture obtained in S2 and stir and mix at room temperature to obtain a mixture. Turn it over and press it to obtain a water-resistant cold patch material for repairing potholes containing milling material.

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