Asphalt cold patch grouting liquid and preparation method thereof

Abstract

The application belongs to the technical field of road engineering, and particularly relates to a kind of asphalt cold patch grouting liquid and a preparation method thereof. The asphalt cold patch grouting liquid is prepared from the following raw materials: C12A7 quick-setting mineral material, calcium sulfate whisker, zirconium silica ash, S95 grade slag powder, calcium hydroxide, nano foaming agent, quartz powder, water reducing agent, defoaming agent, latex powder, dispersing and digesting fiber, protein retarder, lithium hydroxide, and water. The asphalt cold patch grouting liquid can realize rapid hydration and temperature rise, accelerate asphalt drying time, shorten traffic opening time, give excellent stability and strength to asphalt after injection, is not easy to cause damage after traffic opening, has long durability, and has good application prospect in the technical field of road engineering.

Description

Technical Field

[0001] This invention belongs to the field of road engineering technology, specifically relating to an asphalt cold patching grout and its preparation method. Background Technology

[0002] Asphalt is a dark brown, complex mixture composed of hydrocarbons of varying molecular weights and their non-metallic derivatives. It is a high-viscosity organic liquid, mostly existing in liquid or semi-solid petroleum form, with a black surface, and is soluble in carbon disulfide and carbon tetrachloride. Asphalt is a waterproof, moisture-proof, and corrosion-resistant organic cementing material. Asphalt can be mainly divided into three types: coal tar pitch, petroleum asphalt, and natural asphalt. Coal tar pitch is a byproduct of coking. Petroleum asphalt is the residue after crude oil distillation. Natural asphalt is stored underground, sometimes forming mineral layers or accumulating on the earth's surface. Asphalt is mainly used in the coatings, plastics, and rubber industries, as well as in road paving.

[0003] Asphalt pavement is a variety of road surfaces formed by paving and compacting asphalt concrete. Asphalt concrete is a mixture made by thoroughly mixing asphalt materials with a certain viscosity and appropriate amount with mineral aggregates of a certain gradation. As an asphalt pavement material, asphalt concrete must withstand the repeated loads of passing vehicles and the long-term effects of environmental factors during use. Therefore, while possessing a certain pressure resistance, asphalt concrete must also have good durability against natural factors. In other words, it must exhibit sufficient stability under high-temperature conditions, crack resistance under low-temperature conditions, good water stability, long-lasting anti-aging properties, and skid resistance conducive to safety, to ensure the good service function of the asphalt pavement.

[0004] Cold patch asphalt is a new type of road material made by mixing coarse aggregate, fine aggregate, filler, and cold patching fluid. The cold patching fluid, as the binder of cold patch asphalt, has low viscosity at room temperature and is in a fluid state. It is acidic and, to a certain extent, determines the ease of construction, high-temperature performance, low-temperature performance, water stability, and fatigue life of cold patch asphalt.

[0005] Existing asphalt cold patch materials have slow drying time, poor durability, and will cause damage after traffic. In practical applications, in order to save time and simplify the operation process, the filling method is often used, which cannot form vertical force, thus causing the cold patch material to detach. Summary of the Invention

[0006] Based on the above technical background, the main objective of this invention is to provide an asphalt cold patching grout and its preparation method to overcome the shortcomings of the prior art.

[0007] To achieve the aforementioned objectives, the technical solution adopted by this invention includes:

[0008] The first aspect of this invention is to provide a cold-mix asphalt grouting fluid, which is prepared from the following raw materials in parts by weight: 40-50 parts by weight of C12A7 quick-setting mineral material, 5-7 parts by weight of calcium sulfate whiskers, 1-2 parts by weight of zirconium silicate ash, 6-8 parts by weight of S95 grade slag powder, 2-3 parts by weight of calcium hydroxide, 0.1-0.2 parts by weight of nano foaming agent, 40-50 parts by weight of quartz powder, 0.2-0.4 parts by weight of water-reducing agent, 0.04-0.1 parts by weight of defoamer, 0.7-1.5 parts by weight of latex powder, 1.0-1.5 parts by weight of dispersible and digested fiber, 0.02-0.06 parts by weight of protein retarder, 0.05-0.4 parts by weight of lithium hydroxide, and 15-25 parts by weight of water.

[0009] Preferably, the asphalt cold-mix grout is prepared from the following raw materials in parts by weight: 45 parts by weight of C12A7 quick-setting mineral material, 6 parts by weight of calcium sulfate whiskers, 2 parts by weight of zirconium silicate ash, 7 parts by weight of S95 grade slag powder, 2 parts by weight of calcium hydroxide, 0.2 parts by weight of nano foaming agent, 45 parts by weight of quartz powder, 0.3 parts by weight of water-reducing agent, 0.07 parts by weight of defoamer, 1 part by weight of latex powder, 1.0 part by weight of dispersing and digesting fiber, 0.05 parts by weight of protein retarder, 0.3 parts by weight of lithium hydroxide, and 20 parts by weight of water.

[0010] Preferably, the raw materials for preparing the asphalt cold patching grout also include: 2-3 parts by weight of sodium silicate and 3.2-4.5 parts by weight of lightly calcined magnesium oxide;

[0011] The nano-foaming agent is prepared from a high-temperature foaming agent, defatted aluminum powder, sodium dodecyl sulfate (K12), sodium α-alkenyl sulfonate (AOS), sodium rosinate, sodium stearate, and a cellulose emulsion with a mass concentration of 2% to 5%.

[0012] More preferably, the raw materials for preparing the asphalt cold patching grout also include: 3 parts by weight of sodium silicate and 4 parts by weight of lightly calcined magnesium oxide;

[0013] The mass ratio of high-temperature foaming agent, defatted aluminum powder, sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium rosinate, sodium stearate and cellulose emulsion is (1-3):1:(0.5-1):(1-1.5):(1.5-2.0):(1-3):(17-20);

[0014] The cellulose emulsion is a hydroxyethyl cellulose emulsion with a viscosity of 100,000.

[0015] Preferably, the water-reducing agent is selected from one or more of lignin sulfonate, polycarboxylate water-reducing agent, and naphthalene sulfonate formaldehyde polymer;

[0016] The defoamer is selected from one or more mineral oil defoamers;

[0017] The latex powder is ethylene vinyl acetate;

[0018] The particle size range of the quartz powder is 200-300 mesh;

[0019] The lightly calcined magnesium oxide is obtained by calcining magnesium oxide at high temperature;

[0020] The average length of the dispersed and digested fibers is 3 to 7 mm.

[0021] More preferably, the water-reducing agent is a polycarboxylate water-reducing agent;

[0022] The average length of the dispersed and digested fibers is 6 mm.

[0023] A second aspect of the present invention is to provide a method for preparing the asphalt cold patching grout described in the first aspect of the present invention, the method comprising the following steps:

[0024] Step 1: Mix C12A7 quick-setting mineral material, calcium sulfate whiskers, S95 grade slag powder, zirconium silicate ash and quartz powder evenly, then add water, water-reducing agent, defoamer and latex powder and stir evenly to obtain a high-flow-rate hardening slurry.

[0025] Step 2: Add nano foaming agent and dispersing and digesting fiber to the high flow rate hard grout and mix evenly. Then add protein retarder, calcium hydroxide and lithium hydroxide and mix evenly to obtain asphalt cold patching grout.

[0026] Preferably, in both steps 1 and 2, the mixing is carried out at room temperature.

[0027] Preferably, in step 2, sodium silicate and lightly calcined magnesium oxide are added when adding the protein retarder;

[0028] The nano-foaming agent is prepared by the following steps:

[0029] The high-temperature foaming agent is mixed with defatted aluminum powder at 40-50°C, then sodium dodecyl sulfate, sodium α-alkenyl sulfonate and sodium rosinate are added and mixed evenly. Sodium stearate is then added and the mixture is stabilized and homogenized at 50-60°C. Finally, a cellulose emulsion with a mass concentration of 2%-5% is sprayed at room temperature, dried, and passed through a 170-200 mesh sieve to obtain the nano foaming agent.

[0030] Preferably, in step 2, the lightly calcined magnesium oxide is obtained through the following steps:

[0031] Magnesium oxide is obtained by calcining at 950–1050℃ for 20–40 minutes.

[0032] A third aspect of the present invention is to provide an asphalt-based composite material, the asphalt-based composite material comprising asphalt and the asphalt cold patching grout described in the first aspect of the present invention.

[0033] Preferably, in the asphalt-based composite material, the amount of asphalt cold patching grout added is 15-40% of the total mass of asphalt.

[0034] The beneficial effects of this invention are as follows:

[0035] (1) The asphalt cold patching grout of the present invention can achieve rapid hydration and heating, accelerate asphalt drying, shorten the time to traffic, and form a semi-flexible skeleton after injection of asphalt with good durability. The asphalt cold patching grout has foam buffering properties, which makes it have excellent high temperature stability, Marshall stability, water immersion Marshall residual stability and low temperature splitting strength, thus improving service life.

[0036] (2) The nano-foaming agent used in this invention generates micro-foam after being injected into asphalt, which can improve toughness and ductility; the appropriate amount of defoamer works synergistically with the nano-foaming agent to eliminate large-pore bubbles and form uniform "micro-bubbles" that are stable in the slurry, thereby playing a buffering role; the dispersion and dissolution of fibers can improve tensile strength and toughness. The magnesium material + sodium silicate system formed after the hydration of lightly calcined magnesium oxide, the aluminate C12A7 quick-setting mineral material + calcium sulfate whisker system, and the slag powder + calcium hydroxide system are three different reaction-initiating systems that develop synergistically, which can make the early hardening speed fast, the crystal nucleus generation speed fast, and the crystal formation morphology stable and uniform. At the same time, it can make the later expansion good, the density high, and the strength higher and more stable.

[0037] (3) The preparation process of the asphalt cold patching grout described in this invention does not require high temperature and high pressure, has low equipment requirements, and the preparation process is safer and simpler. Attached Figure Description

[0038] Figure 1 The diagram shows a cross-sectional view of the asphalt cold patching composite material obtained after the asphalt cold patching grout prepared in Example 1 is injected into the asphalt and dried. Detailed Implementation

[0039] The present invention will now be described in detail, and its features and advantages will become clearer and more apparent from these descriptions.

[0040] The first aspect of this invention is to provide a cold-mix asphalt grouting fluid, which is prepared from the following raw materials in parts by weight: 40-50 parts by weight of C12A7 quick-setting mineral material, 5-7 parts by weight of calcium sulfate whiskers, 1-2 parts by weight of zirconium silicate ash, 6-8 parts by weight of S95 grade slag powder, 2-3 parts by weight of sodium silicate, 2-3 parts by weight of calcium hydroxide, 0.1-0.2 parts by weight of nano foaming agent, 40-50 parts by weight of quartz powder, 0.2-0.4 parts by weight of water-reducing agent, 0.04-0.1 parts by weight of defoamer, 0.7-1.5 parts by weight of latex powder, 3.2-4.5 parts by weight of lightly calcined magnesium oxide, 1.0-1.5 parts by weight of dispersible and digested fiber, 0.02-0.06 parts by weight of protein retarder, 0.05-0.4 parts by weight of lithium hydroxide, and 15-25 parts by weight of water.

[0041] Preferably, the asphalt cold-mix grout is prepared from the following raw materials in parts by weight: 45 parts by weight of C12A7 quick-setting mineral material, 6 parts by weight of calcium sulfate whiskers, 2 parts by weight of zirconium silicate ash, 7 parts by weight of S95 grade slag powder, 3 parts by weight of sodium silicate, 2 parts by weight of calcium hydroxide, 0.2 parts by weight of nano foaming agent, 45 parts by weight of quartz powder, 0.3 parts by weight of water-reducing agent, 0.07 parts by weight of defoamer, 1 part by weight of latex powder, 4 parts by weight of lightly calcined magnesium oxide, 1.0 part by weight of dispersible and digested fiber, 0.05 parts by weight of protein retarder, 0.3 parts by weight of lithium hydroxide, and 20 parts by weight of water.

[0042] Preferably, the nano-foaming agent is prepared from a high-temperature foaming agent, defatted aluminum powder, sodium dodecyl sulfate (K12), sodium α-alkenyl sulfonate (AOS), sodium rosinate, sodium stearate, and a cellulose emulsion with a mass concentration of 2% to 5%.

[0043] More preferably, the mass ratio of the high-temperature foaming agent, defatted aluminum powder, sodium dodecyl sulfate, sodium α-alkenyl sulfonate (AOS), sodium rosinate, sodium stearate and cellulose emulsion is (1-3):1:(0.5-1):(1-1.5):(1.5-2.0):(1-3):(17-20), and the preferred mass ratio is 2:1:0.8:1.1:1.7:2:18.8.

[0044] The preferred high-temperature foaming agent is AC high-temperature foaming agent produced by Guangdong Duba New Materials Co., Ltd.

[0045] The cellulose emulsion is preferably a hydroxyethyl cellulose emulsion with a viscosity of 100,000.

[0046] The water-reducing agent is selected from one or more of lignin sulfonate, polycarboxylate water-reducing agent and naphthalene sulfonate formaldehyde polymer, preferably polycarboxylate water-reducing agent.

[0047] The defoamer is selected from one or more mineral oil defoamers, preferably German Mingling P803 type defoamer.

[0048] The latex powder is preferably ethylene vinyl acetate.

[0049] The particle size range of the quartz powder is 200-300 mesh.

[0050] The lightly calcined magnesium oxide is obtained by calcining magnesium oxide at high temperature, preferably by calcining magnesium oxide at 950-1050°C for 20-40 minutes.

[0051] The average length of the dispersing and digesting fiber (purchased from Shandong Taishan Fiberglass) is 3-7 mm, preferably 6 mm.

[0052] A second aspect of the present invention is to provide a method for preparing the asphalt cold patching grout described in the first aspect of the present invention, comprising the following steps:

[0053] Step 1: Mix C12A7 quick-setting mineral material, calcium sulfate whiskers, S95 grade slag powder, zirconium silicate ash and quartz powder evenly, then add water, water-reducing agent, defoamer and latex powder and stir evenly to obtain a high-flow-rate hardening slurry.

[0054] Step 2: Add nano foaming agent and dispersing and digesting fiber to the high flow rate hard grout and mix evenly. Then add protein retarder, calcium hydroxide and lithium hydroxide and mix evenly to obtain asphalt cold patching grout.

[0055] The steps described above are described in detail below.

[0056] In step 1, the stirring and mixing are preferably carried out at room temperature, and the mixture is stirred and dispersed evenly until there are no lumps.

[0057] In step 2, sodium silicate and lightly calcined magnesium oxide are added along with the protein retarder.

[0058] The nano-foaming agent is prepared by the following steps:

[0059] The high-temperature foaming agent is mixed with defatted aluminum powder at 40-50°C, then sodium dodecyl sulfate, sodium α-alkenyl sulfonate and sodium rosinate are added and mixed evenly. Sodium stearate is then added and the mixture is stabilized and homogenized at 50-60°C. Finally, a cellulose emulsion with a mass concentration of 2%-5% is sprayed at room temperature, dried, and passed through a 170-200 mesh sieve to obtain the nano foaming agent.

[0060] Preferably, the high-temperature foaming agent is mixed with defatted aluminum powder at 45°C, then sodium dodecyl sulfate, sodium α-alkenyl sulfonate and sodium rosinate are added and mixed evenly, followed by the addition of sodium stearate and stabilization at 55°C, and finally a cellulose emulsion with a mass concentration of 2% to 5% is sprayed at room temperature, then dried and passed through a 200-mesh sieve to obtain the nano foaming agent.

[0061] The mass ratio of the high-temperature foaming agent to the degreased aluminum powder is (1-3):1, preferably 2:1.

[0062] The mass ratio of sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium rosinate, sodium stearate and defatted aluminum powder is (0.5-1):(1-1.5):(1.5-2.0):(1-3):1, preferably 0.8:1.1:1.7:2:1.

[0063] The lightly calcined magnesium oxide is obtained through the following steps:

[0064] Magnesium oxide is obtained by calcining it in a muffle furnace at 950–1050 °C for 20–40 minutes.

[0065] Preferably, magnesium oxide is obtained by calcining it in a muffle furnace at 1000°C for 10 minutes.

[0066] All mixing was carried out at room temperature, and the mixture was stirred and dispersed evenly until there were no lumps.

[0067] A third aspect of the present invention is to provide an asphalt-based composite material, the asphalt-based composite material comprising asphalt and the asphalt cold patching grout described in the first aspect of the present invention.

[0068] Preferably, in the asphalt-based composite material, the amount of asphalt cold patching grout added is 15-40% of the total mass of asphalt.

[0069] The asphalt-based composite material is prepared by the following steps: injecting the asphalt cold patching grout liquid described in the first aspect of the present invention into asphalt and drying it for 5 to 10 minutes.

[0070] The asphalt cold patching grout of this invention can rapidly hydrate and heat up. After being injected into asphalt, it forms a semi-flexible skeleton with good durability. At the same time, it can accelerate asphalt drying, shorten the time to traffic. It has excellent high-temperature stability, Marshall stability, water immersion Marshall residual stability and low-temperature splitting strength, and has a long service life.

[0071] Example

[0072] The present invention is further illustrated below with specific examples. These embodiments are merely illustrative and not intended to limit the scope of the invention. All raw materials used in the embodiments of the present invention are commercially available.

[0073] Example 1

[0074] Magnesium oxide is placed in a muffle furnace and heated to 1000℃ for 30 minutes to obtain lightly calcined magnesium oxide.

[0075] Weigh the following ingredients according to a mass ratio of 2:1:0.8:1.1:1.7:2:18.8: high-temperature foaming agent (AC high-temperature foaming agent produced by Guangdong Duba New Materials Co., Ltd.), defatted aluminum powder, sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium rosinate, sodium stearate, and hydroxyethyl cellulose emulsion (viscosity 100,000). Heat the weighed high-temperature foaming agent and defatted aluminum powder to 45°C and mix thoroughly. Then add sodium dodecyl sulfate, sodium α-alkenyl sulfonate, and sodium rosinate and mix thoroughly. Next, add sodium stearate and heat to 55°C to stabilize and homogenize. Finally, spray a 2%–5% hydroxyethyl cellulose emulsion at room temperature, then dry and pass through a 200-mesh sieve to obtain the nano-foaming agent.

[0076] Weigh out 45 parts by weight of C12A7 quick-setting mineral material, 6 parts by weight of calcium sulfate whiskers, 2 parts by weight of zirconium silicate ash, 7 parts by weight of S95 grade slag powder, 3 parts by weight of sodium silicate, 2 parts by weight of calcium hydroxide, 0.2 parts by weight of nano foaming agent, 45 parts by weight of quartz powder (particle size 200-300 mesh), 0.3 parts by weight of polycarboxylate superplasticizer, 0.07 parts by weight of defoamer (German Mingling P803 type defoamer), 1 part by weight of ethylene vinyl acetate latex powder, 4 parts by weight of lightly calcined magnesium oxide, 1.0 part by weight of dispersing and digesting fiber (purchased from Shandong Taishan Fiberglass, average length 6mm), 0.05 parts by weight of protein retarder, 0.3 parts by weight of lithium hydroxide, and 20 parts by weight of water.

[0077] The weighed C12A7 quick-setting mineral material, calcium sulfate whiskers, S95 grade slag powder, zirconium silicate ash and quartz powder are mixed evenly at room temperature. Then, water, polycarboxylate superplasticizer, defoamer and ethylene vinyl acetate latex powder are added and stirred evenly to obtain a high-flow-rate hardening slurry.

[0078] Nano-foaming agent and dispersing and digesting fiber are added to a high-flow-rate hardening grout and mixed evenly at room temperature. Then, sodium silicate, lightly calcined magnesium oxide, protein retarder, calcium hydroxide and lithium hydroxide are added and mixed evenly at room temperature to obtain asphalt cold patching grout.

[0079] Example 2

[0080] The asphalt cold patching grout was prepared in a manner similar to that in Example 1, with the only difference being:

[0081] Weigh out 50 parts by weight of C12A7 quick-setting mineral material, 7 parts by weight of calcium sulfate whiskers, 2 parts by weight of zirconium silicate ash, 8 parts by weight of S95 grade slag powder, 3 parts by weight of sodium silicate, 3 parts by weight of calcium hydroxide, 0.2 parts by weight of nano foaming agent, 40 parts by weight of quartz powder (particle size 200-300 mesh), 0.2 parts by weight of polycarboxylate superplasticizer, 0.04 parts by weight of defoamer (German Mingling P803 type defoamer), 0.7 parts by weight of ethylene vinyl acetate latex powder, 3.2 parts by weight of lightly calcined magnesium oxide, 1.0 part by weight of dispersing and digesting fiber (purchased from Shandong Taishan Fiberglass, average length 6mm), 0.02 parts by weight of protein retarder, 0.05 parts by weight of lithium hydroxide, and 15 parts by weight of water.

[0082] Example 3

[0083] The asphalt cold patching grout was prepared in a manner similar to that in Example 1, with the only difference being:

[0084] Weigh out 40 parts by weight of C12A7 quick-setting mineral material, 5 parts by weight of calcium sulfate whiskers, 1 part by weight of zirconium silicate ash, 6 parts by weight of S95 grade slag powder, 2 parts by weight of sodium silicate, 2 parts by weight of calcium hydroxide, 0.1 parts by weight of nano foaming agent, 50 parts by weight of quartz powder (particle size 200-300 mesh), 0.4 parts by weight of polycarboxylate superplasticizer, 0.1 parts by weight of defoamer (German Mingling P803 type defoamer), 1.5 parts by weight of ethylene vinyl acetate latex powder, 4.5 parts by weight of lightly calcined magnesium oxide, 1.5 parts by weight of dispersing and digesting fiber (purchased from Shandong Taishan Fiberglass, average length 6mm), 0.06 parts by weight of protein retarder, 0.4 parts by weight of lithium hydroxide, and 25 parts by weight of water.

[0085] Experimental Example

[0086] Experiment Example 1 Performance Test (Cold Asphalt Grouting Liquid + Cold Asphalt)

[0087] The asphalt cold patching grouting fluids prepared in Examples 1, 2, and 3 were injected into asphalt and dried for 5-10 minutes. The amount of asphalt cold patching added was 15-40% of the asphalt mass. The appropriate porosity was determined by different aggregate sizes. The cross-sectional view of the asphalt cold patching composite material obtained by injecting the asphalt cold patching fluid prepared in Example 1 into asphalt is shown in the figure. Figure 1 As shown in the figure, the dark gray portion is the asphalt cold patching material, and the light gray portion is asphalt. The asphalt cold patching composite material was tested according to GB50092 "Specification for Construction and Acceptance of Asphalt Pavement", and the test results are shown in Table 1.

[0088] Table 1

[0089]

[0090] As shown in Table 1, the asphalt cold patching grout prepared by this invention, after being injected into asphalt, exhibits high-temperature stability of over 47,000 times / mm, Marshall stability of over 18kN, water immersion Marshall residual stability of over 99%, and low-temperature splitting strength of over 3.5MPa, demonstrating excellent performance.

[0091] Experiment Example 2: Compressive and Flexural Strength Tests (Cold Asphalt Grouting)

[0092] The compressive strength and flexural strength of the asphalt cold patching grouts prepared in Examples 1, 2, and 3 were tested according to the T / CECS864 standard test method. The bond strength and dimensional change rate of the asphalt cold patching grouts prepared in Examples 1, 2, and 3 were tested according to JC / T985. The fluidity and vertical expansion rate of the asphalt cold patching grouts prepared in Examples 1, 2, and 3 were tested according to GB50448 standard. The test results for the asphalt cold patching grouts prepared in Examples 1, 2, and 3 are shown in Tables 2, 3, and 4, respectively.

[0093] Table 2

[0094]

[0095]

[0096] Table 3

[0097]

[0098] Table 4

[0099]

[0100]

[0101] As can be seen from Tables 2, 3, and 4, the asphalt cold patching grout of this invention has good flow properties, allowing it to easily flow into the voids of the asphalt. Furthermore, the asphalt cold patching grout exhibits high flexural strength, compressive strength, and bond strength, with the compressive and flexural strengths increasing significantly over time. Simultaneously, the asphalt cold patching grout of this invention also possesses the advantages of low dimensional change rate and vertical expansion of the material in a plastic state.

[0102] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A cold patching grout for asphalt, characterized in that, The asphalt cold-mix grout is prepared from the following raw materials in parts by weight: 40-50 parts by weight of C12A7 quick-setting mineral material, 5-7 parts by weight of calcium sulfate whiskers, 1-2 parts by weight of zirconium silicate ash, 6-8 parts by weight of S95 grade slag powder, 2-3 parts by weight of calcium hydroxide, 0.1-0.2 parts by weight of nano foaming agent, 40-50 parts by weight of quartz powder, 0.2-0.4 parts by weight of water-reducing agent, 0.04-0.1 parts by weight of defoamer, 0.7-1.5 parts by weight of latex powder, 1.0-1.5 parts by weight of dispersing and digesting fiber, 0.02-0.06 parts by weight of protein retarder, 0.05-0.4 parts by weight of lithium hydroxide, and 15-25 parts by weight of water. The amount of cold patching grout added is 15-40% of the total mass of asphalt.

2. The asphalt cold patching grout according to claim 1, characterized in that, The asphalt cold-mix grout is made from the following raw materials in parts by weight: 45 parts by weight of C12A7 quick-setting mineral material, 6 parts by weight of calcium sulfate whiskers, 2 parts by weight of zirconium silicate ash, 7 parts by weight of S95 grade slag powder, 2 parts by weight of calcium hydroxide, 0.2 parts by weight of nano foaming agent, 45 parts by weight of quartz powder, 0.3 parts by weight of water-reducing agent, 0.07 parts by weight of defoamer, 1 part by weight of latex powder, 1.0 part by weight of dispersing and digesting fiber, 0.05 parts by weight of protein retarder, 0.3 parts by weight of lithium hydroxide, and 20 parts by weight of water.

3. The asphalt cold patching grout according to claim 1, characterized in that, The raw materials for preparing the asphalt cold patching grout also include: 2-3 parts by weight of sodium silicate and 3.2-4.5 parts by weight of lightly calcined magnesium oxide; The nano-foaming agent is prepared from a high-temperature foaming agent, defatted aluminum powder, sodium dodecyl sulfate, sodium α-alkenyl sulfonate, sodium rosinate, sodium stearate, and a cellulose emulsion with a mass concentration of 2% to 5%.

4. The asphalt cold patching grout according to claim 1, characterized in that, The water-reducing agent is selected from one or more of lignin sulfonate, polycarboxylate water-reducing agent and naphthalene sulfonate formaldehyde polymer; The defoamer is selected from mineral oil defoamers; The latex powder is ethylene vinyl acetate; The particle size range of the quartz powder is 200-300 mesh; The average length of the dispersed and digested fibers is 3 to 7 mm.

5. The asphalt cold patching grout according to claim 4, characterized in that, The water-reducing agent is a polycarboxylate water-reducing agent; The average length of the dispersed and digested fibers is 6 mm.

6. A method for preparing the asphalt cold patching grout according to claim 1, characterized in that, The method includes: Step 1: Mix C12A7 quick-setting mineral material, calcium sulfate whiskers, S95 grade slag powder, zirconium silicate ash and quartz powder evenly, then add water, water-reducing agent, defoamer and latex powder and stir evenly to obtain a high-flow-rate hardening slurry. Step 2: Add nano foaming agent and dispersing and digesting fiber to the high flow rate hard grout and mix evenly. Then add protein retarder, calcium hydroxide and lithium hydroxide and mix evenly to obtain asphalt cold patching grout.

7. The method according to claim 6, characterized in that, In both steps 1 and 2, the mixing is carried out at room temperature.

8. The method according to claim 6, characterized in that, In step 2, Sodium silicate and lightly calcined magnesium oxide are also added when adding protein retarder; The nano-foaming agent is prepared by the following steps: The high-temperature foaming agent is mixed with defatted aluminum powder at 40-50°C, then sodium dodecyl sulfate, sodium α-alkenyl sulfonate and sodium rosinate are added and mixed evenly. Sodium stearate is then added and the mixture is stabilized and homogenized at 50-60°C. Finally, a cellulose emulsion with a mass concentration of 2%-5% is sprayed at room temperature, dried, and passed through a 170-200 mesh sieve to obtain the nano foaming agent.

9. An asphalt-based composite material, characterized in that, The asphalt-based composite material includes asphalt and the asphalt cold patching grout as described in any one of claims 1 to 5; In the asphalt-based composite material, the amount of asphalt cold patching grout added is 15-40% of the total mass of asphalt.

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