A quick-curing high-sticky high-strength road cold patch material and a preparation method thereof

Abstract

The application discloses a kind of high-strength high-viscosity highway cold patch material of quick solidification, including the following weight parts of component: sulphate cement 40~50 parts, modified slag 20~30 parts, active magnesium oxide 4~6 parts, slaked lime 2~4 parts, EVA latex powder 2~3 parts, nano silicon dioxide 1~2 parts, basalt 20~40 parts, quartz sand 15~25 parts, polycarboxylic acid water reducing agent 0.8~1.2 parts, boric acid retarder 0.3~0.5 parts.The preparation method is: S1.EVA latex powder is mixed with quartz sand, modified slag is mixed with nano silicon dioxide, sulphate cement is mixed with boric acid retarder according to proportion respectively preliminary premixing;S2.basalt, three kinds of premixing material, active magnesium oxide and slaked lime are added to mixer according to proportion, and dry mixture is obtained by step stirring;S3.polycarboxylic acid water reducing agent and water are dissolved according to proportion to obtain mixing water, and the mixing water is added to dry mixture to obtain finished product.The high-strength high-viscosity highway cold patch material of quick solidification prepared by the application has short initial setting time, and has high compressive strength and bonding strength.

Description

Technical Field

[0001] This invention relates to the field of highway engineering construction materials technology, and in particular to a fast-setting, high-viscosity, high-strength highway cold patching material and its preparation method. Background Technology

[0002] Under the long-term effects of vehicle loads and environmental factors, road surfaces inevitably develop localized damage such as potholes and cracks. Timely and rapid repair of road surface problems is crucial to ensuring road safety and extending the service life of road surfaces. Cold patching materials, as a rapid repair material that can be applied and maintained at room temperature, have become an important technical means for preventive maintenance and emergency repair of road surfaces due to their advantages such as being unaffected by seasons and climates and being easy to apply.

[0003] Traditional cold patch materials mostly use emulsified asphalt or ordinary Portland cement as the main components. While emulsified asphalt has good workability as a cold patch material, it suffers from drawbacks such as slow curing speed, low initial strength, and insufficient adhesion. Repairs require prolonged traffic closure, failing to meet the urgent needs of high-grade highways and urban arterial roads for rapid reopening. Cold patch materials using ordinary Portland cement as the main binder, on the other hand, suffer from excessively long setting time, low early strength, and susceptibility to cracking, similarly making them unsuitable for rapid repair conditions.

[0004] Therefore, this application provides a fast-setting, high-viscosity, high-strength highway cold patch material and its preparation method to solve the problems of low initial strength, long setting time, and low construction efficiency of highway cold patch materials, shorten the initial setting time of highway cold patch materials, increase compressive strength and bonding strength, and improve the efficiency and quality of highway repair. Summary of the Invention

[0005] The purpose of this invention is to provide a fast-setting, high-viscosity, and high-strength cold-patch material for highways and its preparation method, so as to solve the problems of low initial strength, long setting time, and low construction efficiency of cold-patch materials for highways mentioned in the background art, shorten the initial setting time of cold-patch materials for highways, increase compressive strength and bonding strength, and improve the efficiency and quality of highway repair.

[0006] In a first aspect, the present invention provides a fast-setting, high-viscosity, high-strength cold-patch material for highways, comprising the following components in parts by weight: 40-50 parts of sulfoaluminate cement, 20-30 parts of modified slag, 4-6 parts of activated magnesium oxide, 2-4 parts of hydrated lime, 2-3 parts of ethylene-vinyl acetate copolymer latex powder (EVA latex powder), 1-2 parts of nano-silica, 20-40 parts of basalt, 15-25 parts of quartz sand, 0.8-1.2 parts of polycarboxylate superplasticizer, and 0.3-0.5 parts of boric acid retarder.

[0007] As a preferred embodiment of the present invention, the sulfoaluminate cement is a rapid-hardening type with a strength grade of 42.5 and a compressive strength of not less than 30.0 MPa at 1 day, not less than 42.5 MPa at 3 days, and not less than 45.0 MPa at 28 days.

[0008] As a preferred embodiment of the present invention, the modified slag is prepared by the following method: slag is dried at 105°C for 1 hour, and then passed through a 120-mesh sieve to obtain slag powder; the slag powder is placed in a ball mill, and the modifiers sodium hydroxide, potassium polyphosphate, polyacrylamide, and polyether diol are added to the ball mill in a mass ratio of slag powder: sodium hydroxide: potassium polyphosphate: polyacrylamide: polyether diol of 50:5:3:1:3, and the mixture is ball-milled at 400 r / min for 3-5 hours to obtain activated slag slurry; the activated slag slurry is placed in an infrared dryer and dried at 60°C for 5-10 minutes to obtain modified slag.

[0009] As a preferred embodiment of the present invention, the particle size of the nano-silica is 10-20 nm.

[0010] As a preferred technical solution of the present invention, the basalt is pretreated by the following method: the basalt raw stone is placed in a jaw crusher and crushed to a particle size of 5-10 mm, then washed with a high-pressure water gun with a pressure of 0.8 MPa for 30 minutes, and then placed in an oven and dried at 105°C for 2 hours to obtain basalt.

[0011] As a preferred embodiment of the present invention, the quartz sand has a particle size of 0.5 to 2 mm.

[0012] Secondly, the present invention also provides a method for preparing a fast-setting, high-viscosity, high-strength highway cold patching material, comprising the following steps: S1. Preliminary premixing: EVA latex powder is premixed with quartz sand, modified slag with nano silica, and sulfoaluminate cement with boric acid retarder to obtain EVA-quartz sand premix, sulfoaluminate cement-boric acid premix, and modified slag-nano silica premix.

[0013] S2. Dry mixing: (1) Add basalt to the twin-shaft forced mixer and stir at 150 r / min for 2 to 4 minutes; (2) Add EVA-quartz sand premix and continue stirring at 150 r / min for 3 to 6 minutes; (3) Add sulfoaluminate cement-boric acid premix and modified slag-nano silica premix and continue stirring at 150 r / min for 5 to 8 minutes; (4) Finally add active magnesium oxide and hydrated lime and stir at 150 r / min for 2 to 4 minutes to obtain dry mix.

[0014] S3. Wet material mixing: (1) Add polycarboxylate superplasticizer and water to a vertical mixer at a mass ratio of 1:16 and stir at a speed of 300r / min until the polycarboxylate superplasticizer is completely dissolved to obtain mixing water; (2) Keep the speed of the twin-shaft forced mixer in S2 at 150r / min, add the mixing water to the dry mixture, and stir for 6 to 10 minutes to obtain fast-setting high-viscosity and high-strength highway cold patch material.

[0015] As a preferred technical solution of the present invention, the EVA-quartz sand premix is ​​prepared by the following method: EVA latex powder and quartz sand are placed in a ribbon mixer and stirred at a speed of 100 r / min for 5 to 8 minutes to obtain the EVA-quartz sand premix.

[0016] As a preferred technical solution of the present invention, the sulfoaluminate cement-boric acid premix is ​​prepared by the following method: the boric acid retarder is ball-milled through a 200-mesh sieve and then placed in a V-type mixer, and then sulfoaluminate cement is added and stirred at a speed of 100 r / min for 5 to 8 minutes to obtain the sulfoaluminate cement-boric acid premix.

[0017] As a preferred technical solution of the present invention, the modified slag-nano silica premix is ​​prepared by the following method: the modified slag and nano silica are placed in a high-speed mixer and stirred at a speed of 3000 r / min for 3 to 5 minutes to obtain the modified slag-nano silica premix.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes sulfoaluminate cement in a fast-setting, high-viscosity, high-strength road cold-patch material. The core mineral, anhydrous calcium sulfoaluminate, rapidly forms ettringite upon contact with water, resulting in a rapid increase in compressive strength within 2 hours and high early-stage strength. However, sulfoaluminate cement-based materials are prone to shrinkage and cracking. The active magnesium oxide added in this invention expands upon hydration to form magnesium hydroxide, which compensates for the hydration shrinkage of the sulfoaluminate cement, improving the early-stage volume stability and crack resistance of the road cold-patch material and solving the problem of cracking in fast-setting materials.

[0019] 2. This invention incorporates modified slag into a fast-setting, high-viscosity, high-strength road cold patch material. Compared to unmodified slag, the modified slag has an increased specific surface area and activity index. Its enhanced activity allows it to synergistically react with the hydration products of sulfoaluminate cement to generate more gel components, ensuring the durability of compressive strength and avoiding the problem of strength reduction in the later stages of road cold patch materials caused by using sulfoaluminate cement alone.

[0020] 3. This invention uses EVA latex powder as a binder in fast-setting, high-viscosity, and high-strength cold-patch materials for highways. EVA latex powder is an ethylene-vinyl acetate copolymer made by copolymerizing ethylene and vinyl acetate. Compared with traditional binders such as emulsified asphalt, EVA latex powder has better flexibility and water resistance, and is less prone to brittleness at low temperatures, thus improving the bonding strength of cold-patch materials for highways.

[0021] 4. This invention incorporates nano-silica into a fast-setting, high-viscosity, and high-strength road cold patch material. Nano-silica has a large specific surface area, which can efficiently adsorb the gel produced by cement hydration. It has a micro-filling effect on the road cold patch material, reducing the porosity of the road cold patch material and enhancing its compressive strength. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating the preparation process of the fast-setting, high-viscosity, high-strength highway cold patching material of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, a method for preparing a fast-setting, high-viscosity, high-strength road cold patching material includes the following steps: S1. Preliminary premixing: EVA latex powder, quartz sand, modified slag, nano silica, sulfoaluminate cement, and boric acid retarder are premixed separately in proportion to obtain premixed materials.

[0027] S2. Dry Mixing: Basalt is added to the twin-shaft forced mixer in proportion, followed by EVA-quartz sand premix, then sulfoaluminate cement-boric acid premix and modified slag-nano silica premix, and finally active magnesium oxide and hydrated lime. The mixture is stirred step by step to obtain the dry mix.

[0028] S3. Wet material mixing: Polycarboxylate superplasticizer and water are added to a vertical mixer in proportion to dissolve and obtain mixing water; then the mixing water is added to the dry mixture and stirred in a twin-shaft forced mixer to obtain a fast-setting, high-viscosity, high-strength highway cold patch material.

[0029] All raw materials used in this invention are commercially available.

[0030] Example 1:

[0031] A fast-setting, high-viscosity, high-strength cold-patch material for highways comprises the following components in parts by weight: 40 parts of sulfoaluminate cement, 20 parts of modified slag, 4 parts of activated magnesium oxide, 2 parts of hydrated lime, 2 parts of EVA latex powder, 1 part of nano-silica, 20 parts of basalt, 15 parts of quartz sand, 0.8 parts of polycarboxylate superplasticizer, and 0.3 parts of boric acid retarder.

[0032] Modified slag was prepared by the following method: Slag was dried at 105℃ for 1 hour and then passed through a 120-mesh sieve to obtain slag powder; the slag powder was placed in a ball mill, and the modifiers sodium hydroxide, potassium polyphosphate, polyacrylamide, and polyether diol were added to the ball mill in a mass ratio of slag powder: sodium hydroxide: potassium polyphosphate: polyacrylamide: polyether diol of 50:5:3:1:3. The mixture was ball-milled at 400 r / min for 3 hours to obtain activated slag slurry; the activated slag slurry was placed in an infrared dryer and dried at 60℃ for 5 minutes to obtain modified slag.

[0033] The basalt was pretreated using the following method: the raw basalt stone was placed in a jaw crusher and crushed to a particle size of 5-10 mm. Then, it was washed with a high-pressure water gun with a pressure of 0.8 MPa for 30 minutes and placed in an oven to dry at 105℃ for 2 hours to obtain basalt.

[0034] A method for preparing a fast-setting, high-viscosity, high-strength road cold patching material includes the following steps: S1. Preliminary premixing: EVA latex powder and quartz sand, modified slag and nano silica, sulfoaluminate cement and boric acid retarder are preliminarily premixed to obtain three kinds of premixes: (1) EVA latex powder and quartz sand are placed in a ribbon mixer and stirred at 100 r / min for 5 minutes to obtain EVA-quartz sand premix; (2) boric acid retarder is ball-milled through a 200-mesh sieve and then placed in a V-type mixer, and sulfoaluminate cement is added and stirred at 100 r / min for 5 minutes to obtain sulfoaluminate cement-boric acid premix; (3) modified slag and nano silica are placed in a high-speed mixer and stirred at 3000 r / min for 3 minutes to obtain modified slag-nano silica premix.

[0035] S2. Dry mixing: (1) Add basalt to the twin-shaft forced mixer and stir for 2 minutes at a speed of 150 r / min; (2) Add EVA-quartz sand premix and continue stirring for 3 minutes at a speed of 150 r / min; (3) Add sulfoaluminate cement-boric acid premix and modified slag-nano silica premix and continue stirring for 5 minutes at a speed of 150 r / min; (4) Finally add active magnesium oxide and hydrated lime and stir for 2 minutes at a speed of 150 r / min to obtain dry mix.

[0036] S3. Wet material mixing: (1) Add polycarboxylate superplasticizer and water to a vertical mixer at a mass ratio of 1:16 and stir at a speed of 300r / min until the polycarboxylate superplasticizer is completely dissolved to obtain mixing water; (2) Keep the speed of the twin-shaft forced mixer in S2 at 150r / min, add the mixing water to the dry mixture, stir for 6 minutes to obtain fast-setting high-viscosity and high-strength highway cold patch material.

[0037] Example 2:

[0038] A fast-setting, high-viscosity, high-strength cold-patch material for highways comprises the following components in parts by weight: 45 parts of sulfoaluminate cement, 25 parts of modified slag, 5 parts of active magnesium oxide, 3 parts of hydrated lime, 2.5 parts of EVA latex powder, 1.5 parts of nano-silica, 30 parts of basalt, 20 parts of quartz sand, 1 part of polycarboxylate superplasticizer, and 0.4 parts of boric acid retarder.

[0039] Modified slag was prepared by the following method: Slag was dried at 105℃ for 1 hour and then passed through a 120-mesh sieve to obtain slag powder; the slag powder was placed in a ball mill, and the modifiers sodium hydroxide, potassium polyphosphate, polyacrylamide, and polyether diol were added to the ball mill in a mass ratio of slag powder: sodium hydroxide: potassium polyphosphate: polyacrylamide: polyether diol of 50:5:3:1:3. The mixture was ball-milled at 400 r / min for 4 hours to obtain activated slag slurry; the activated slag slurry was placed in an infrared dryer and dried at 60℃ for 8 minutes to obtain modified slag.

[0040] The basalt was pretreated using the following method: the raw basalt stone was placed in a jaw crusher and crushed to a particle size of 5-10 mm. Then, it was washed with a high-pressure water gun with a pressure of 0.8 MPa for 30 minutes and placed in an oven to dry at 105℃ for 2 hours to obtain basalt.

[0041] A method for preparing a fast-setting, high-viscosity, high-strength road cold patching material includes the following steps: S1. Preliminary premixing: EVA latex powder and quartz sand, modified slag and nano silica, and sulfoaluminate cement and boric acid retarder were preliminarily premixed to obtain three kinds of premixes: (1) EVA latex powder and quartz sand were placed in a ribbon mixer and stirred at 100 r / min for 6 minutes to obtain EVA-quartz sand premix; (2) boric acid retarder was ball-milled through a 200-mesh sieve and placed in a V-type mixer, and then sulfoaluminate cement was added and stirred at 100 r / min for 6 minutes to obtain sulfoaluminate cement-boric acid premix; (3) modified slag and nano silica were placed in a high-speed mixer and stirred at 3000 r / min for 4 minutes to obtain modified slag-nano silica premix.

[0042] S2. Dry mixing: (1) Add basalt to the twin-shaft forced mixer and stir for 3 minutes at a speed of 150 r / min; (2) Add EVA-quartz sand premix and continue stirring for 5 minutes at a speed of 150 r / min; (3) Add sulfoaluminate cement-boric acid premix and modified slag-nano silica premix and continue stirring for 6 minutes at a speed of 150 r / min; (4) Finally add active magnesium oxide and hydrated lime and stir for 3 minutes at a speed of 150 r / min to obtain dry mix.

[0043] S3. Wet material mixing: (1) Add polycarboxylate superplasticizer and water to a vertical mixer at a mass ratio of 1:16 and stir at a speed of 300r / min until the polycarboxylate superplasticizer is completely dissolved to obtain mixing water; (2) Keep the speed of the twin-shaft forced mixer in S2 at 150r / min, add the mixing water to the dry mixture, stir for 8 minutes to obtain fast-setting high-viscosity and high-strength highway cold patch material.

[0044] Example 3:

[0045] A fast-setting, high-viscosity, high-strength cold-patch material for highways comprises the following components in parts by weight: 50 parts of sulfoaluminate cement, 30 parts of modified slag, 6 parts of activated magnesium oxide, 4 parts of hydrated lime, 3 parts of EVA latex powder, 2 parts of nano-silica, 40 parts of basalt, 25 parts of quartz sand, 1.2 parts of polycarboxylate superplasticizer, and 0.5 parts of boric acid retarder.

[0046] Modified slag was prepared by the following method: Slag was dried at 105℃ for 1 hour and then passed through a 120-mesh sieve to obtain slag powder; the slag powder was placed in a ball mill, and the modifiers sodium hydroxide, potassium polyphosphate, polyacrylamide, and polyether diol were added to the ball mill in a mass ratio of slag powder: sodium hydroxide: potassium polyphosphate: polyacrylamide: polyether diol of 50:5:3:1:3. The mixture was ball-milled at 400 r / min for 5 hours to obtain activated slag slurry; the activated slag slurry was placed in an infrared dryer and dried at 60℃ for 10 minutes to obtain modified slag.

[0047] The basalt was pretreated using the following method: the raw basalt stone was placed in a jaw crusher and crushed to a particle size of 5-10 mm. Then, it was washed with a high-pressure water gun with a pressure of 0.8 MPa for 30 minutes and placed in an oven to dry at 105℃ for 2 hours to obtain basalt.

[0048] A method for preparing a fast-setting, high-viscosity, high-strength road cold patching material includes the following steps: S1. Preliminary premixing: EVA latex powder and quartz sand, modified slag and nano silica, sulfoaluminate cement and boric acid retarder were preliminarily premixed to obtain three kinds of premixes: (1) EVA latex powder and quartz sand were placed in a ribbon mixer and stirred at 100 r / min for 8 minutes to obtain EVA-quartz sand premix; (2) boric acid retarder was ball-milled through a 200-mesh sieve and placed in a V-type mixer, then sulfoaluminate cement was added and stirred at 100 r / min for 8 minutes to obtain sulfoaluminate cement-boric acid premix; (3) modified slag and nano silica were placed in a high-speed mixer and stirred at 3000 r / min for 5 minutes to obtain modified slag-nano silica premix.

[0049] S2. Dry mixing: (1) Add basalt to the twin-shaft forced mixer and stir for 4 minutes at a speed of 150 r / min; (2) Add EVA-quartz sand premix and continue stirring for 6 minutes at a speed of 150 r / min; (3) Add sulfoaluminate cement-boric acid premix and modified slag-nano silica premix and continue stirring for 8 minutes at a speed of 150 r / min; (4) Finally add active magnesium oxide and hydrated lime and stir for 4 minutes at a speed of 150 r / min to obtain dry mix.

[0050] S3. Wet material mixing: (1) Add polycarboxylate superplasticizer and water to a vertical mixer at a mass ratio of 1:16 and stir at a speed of 300r / min until the polycarboxylate superplasticizer is completely dissolved to obtain mixing water; (2) Keep the speed of the twin-shaft forced mixer in S2 at 150r / min, add the mixing water to the dry mixture, stir for 10 minutes to obtain fast-setting high-viscosity and high-strength highway cold patch material.

[0051] Comparative Example 1: The difference from Example 1 is that the slag is added directly without modification.

[0052] Comparative Example 2: The difference from Example 1 is that sulfoaluminate cement is replaced with silicate cement.

[0053] Comparative Example 3: The difference from Example 1 is that EVA latex powder is replaced with emulsified asphalt.

[0054] Performance tests were conducted on the fast-curing, high-viscosity, and high-strength cold patch materials for highways produced in Examples 1, 2, and 3 and Comparative Examples 1, 2, and 3.

[0055] The fast-setting, high-viscosity, high-strength road cold patch materials produced in Examples 1, 2, and 3 and Comparative Examples 1, 2, and 3 were tested using GB / T 1346-2024 "Test Methods for Standard Consistency Water Requirement, Setting Time and Soundness of Cement". The 2-hour compressive strength of the fast-setting, high-viscosity, high-strength road cold patch materials was tested using GB / T 17671-2021 "Test Methods for Strength of Cement Mortar (ISO Method)". The results are shown in Table 1.

[0056] Table 1: Initial setting time and 2-hour compressive strength of fast-setting, high-viscosity, high-strength highway cold patch materials

[0057] As shown in Table 1, the fast-setting high-viscosity and high-strength road cold patch materials produced in Examples 1, 2, and 3 have shorter initial setting times and higher 2-hour compressive strength; while the fast-setting high-viscosity and high-strength road cold patch materials produced in Comparative Examples 1, 2, and 3 have longer initial setting times and lower 2-hour compressive strength.

[0058] The bond strength of fast-setting, high-viscosity, and high-strength highway cold-patch material was determined using GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete". The results are shown in Table 2.

[0059] Table 2: Bond Strength of Quick-Setting High-Viscosity and High-Strength Highway Cold Patching Materials

[0060] As shown in Table 2, the fast-curing, high-adhesion, and high-strength cold-patch materials for highways produced in Examples 1, 2, and 3 have higher bonding strength; while the fast-curing, high-adhesion, and high-strength cold-patch materials for highways produced in Comparative Examples 1, 2, and 3 have lower bonding strength.

[0061] In summary, the fast-setting, high-viscosity, and high-strength highway cold patch material produced by this invention can solve the problems of low initial strength, long setting time, and low construction efficiency of highway cold patch materials. It shortens the initial setting time of highway cold patch materials, increases compressive strength and bonding strength, and improves the efficiency and quality of highway repair.

[0062] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A fast-setting, high-viscosity, high-strength cold patching material for highways, characterized in that, The product comprises the following components by weight: 40-50 parts sulfoaluminate cement, 20-30 parts modified slag, 4-6 parts activated magnesium oxide, 2-4 parts hydrated lime, 2-3 parts EVA latex powder, 1-2 parts nano silica, 20-40 parts basalt, 15-25 parts quartz sand, 0.8-1.2 parts polycarboxylate superplasticizer, and 0.3-0.5 parts boric acid retarder. The modified slag is prepared by the following method: slag is dried at 105℃ for 1 hour and then passed through a 120-mesh sieve to obtain slag powder; the slag powder is placed in a ball mill, and the modifiers sodium hydroxide, potassium polyphosphate, polyacrylamide, and polyether diol are added to the ball mill in a mass ratio of slag powder: sodium hydroxide: potassium polyphosphate: polyacrylamide: polyether diol of 50:5:3:1:

3. The mixture is ball-milled at 400 r / min for 3-5 hours to obtain activated slag slurry; the activated slag slurry is placed in an infrared dryer and dried at 60℃ for 5-10 minutes to obtain modified slag.

2. The fast-setting, high-viscosity, high-strength highway cold patching material according to claim 1, characterized in that, The sulfoaluminate cement is a rapid-hardening type with a strength grade of 42.5 and a compressive strength of not less than 30.0 MPa at 1 day, not less than 42.5 MPa at 3 days, and not less than 45.0 MPa at 28 days.

3. The fast-setting, high-viscosity, high-strength highway cold patching material according to claim 1, characterized in that, The particle size of the nano-silica is 10-20 nm.

4. The fast-setting, high-viscosity, high-strength highway cold patching material according to claim 1, characterized in that, The basalt was pretreated using the following method: the raw basalt was placed in a jaw crusher and crushed to a particle size of 5-10 mm, then rinsed with a high-pressure water gun at a pressure of 0.8 MPa for 30 minutes, and then placed in an oven and dried at 105°C for 2 hours to obtain basalt.

5. The fast-setting, high-viscosity, high-strength highway cold patching material according to claim 1, characterized in that, The quartz sand has a particle size of 0.5–2 mm.

6. A method for preparing a fast-setting, high-viscosity, high-strength highway cold patching material according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1. Preliminary premixing: EVA latex powder is premixed with quartz sand, modified slag with nano silica, and sulfoaluminate cement with boric acid retarder to obtain EVA-quartz sand premix, sulfoaluminate cement-boric acid premix, and modified slag-nano silica premix. S2. Dry mixing: (1) First add basalt to the twin-shaft forced mixer and stir at 150 r / min for 2 to 4 minutes; (2) Add EVA-quartz sand premix and continue stirring at 150 r / min for 3 to 6 minutes; (3) Add sulfoaluminate cement-boric acid premix and modified slag-nano silica premix and continue stirring at 150 r / min for 5 to 8 minutes; (4) Finally add active magnesium oxide and hydrated lime and stir at 150 r / min for 2 to 4 minutes to obtain dry mix; S3. Wet material mixing: (1) Add polycarboxylate superplasticizer and water to a vertical mixer at a mass ratio of 1:16 and stir at a speed of 300r / min until the polycarboxylate superplasticizer is completely dissolved to obtain mixing water; (2) Keep the speed of the twin-shaft forced mixer in S2 at 150r / min, add the mixing water to the dry mixture, and stir for 6 to 10 minutes to obtain fast-setting high-viscosity and high-strength highway cold patch material.

7. The preparation method of a fast-setting, high-viscosity, high-strength highway cold patching material according to claim 6, characterized in that, The EVA-quartz sand premix is ​​prepared by the following method: EVA latex powder and quartz sand are placed in a ribbon mixer and stirred at a speed of 100 r / min for 5 to 8 minutes to obtain the EVA-quartz sand premix.

8. The preparation method of a fast-setting, high-viscosity, high-strength highway cold patching material according to claim 6, characterized in that, The sulfoaluminate cement-boric acid premix is ​​prepared by the following method: the boric acid retarder is ball-milled through a 200-mesh sieve and then placed in a V-type mixer. Sulfoaluminate cement is then added and stirred at 100 r / min for 5 to 8 minutes to obtain the sulfoaluminate cement-boric acid premix.

9. The preparation method of a fast-setting, high-viscosity, high-strength highway cold patching material according to claim 6, characterized in that, The modified slag-nano silica premix is ​​prepared by the following method: the modified slag and nano silica are placed in a high-speed mixer and stirred at a speed of 3000 r / min for 3 to 5 minutes to obtain the modified slag-nano silica premix.

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