Low-viscosity reactive asphalt mixture cold mixing liquid as well as preparation method and application thereof

Abstract

The invention relates to a low-viscosity reactive asphalt mixture cold mixing liquid which comprises the following components in parts by mass: 100 parts of matrix asphalt, 10-30 parts of solvent oil and 5-25 parts of single-component polyurethane, the asphalt mixture cold-mixing liquid can effectively reduce the viscosity of asphalt, and has good fluidity and stability, so that the prepared cold-mixed asphalt mixture has good construction workability and pavement performance.

Description

Technical Field

[0001] The present invention relates to the technical field of road maintenance, and in particular to a low-viscosity reactive asphalt mixture cold mix liquid and a preparation method and application thereof. Background Art

[0002] In recent years, with the continuous increase in asphalt pavement mileage, asphalt mixtures are prone to rutting, cracking, and peeling under the effects of long-term traffic loads, rain, and temperature. Among them, potholes are a common pavement disease that occurs in the early stages of roads. They are usually fatigue damage to asphalt pavements caused by the impact force and tire force generated when vehicles pass through the road. It has the characteristics of high frequency of occurrence and large local dispersion. If maintenance and repair are not timely, it will not only affect the service life of the asphalt pavement, but also pose a serious threat to driving safety. Therefore, it is very important and necessary to use pothole repair technology to repair and maintain asphalt pavements.

[0003] Pothole repair technologies for asphalt pavement are mainly divided into hot patching and cold patching. Hot mix asphalt mixtures have high temperature requirements and certain limitations. Compared with hot mix asphalt mixtures, cold mix asphalt has better storage performance, convenient preparation, low production cost, good workability and low energy consumption. It is particularly suitable for pothole repairs on low temperature and humid roads. Therefore, cold mix asphalt mixtures, as an innovative paving material, have been widely used in the field of road maintenance at home and abroad.

[0004] At present, the viscosity of the existing cold mix asphalt mixture is relatively high, and its working performance when mixed with aggregates is poor, resulting in poor construction and workability of the cold mix asphalt mixture; cold mix asphalt mixtures generally have problems such as low initial strength, slow volatilization of diluents, poor water stability and frost resistance. Summary of the invention

[0005] The present application provides a low-viscosity reactive asphalt cold mix liquid and a preparation method thereof, which solves or partially solves the technical problems that the existing cold mix liquid has high viscosity, poor mixing performance with aggregates, low initial strength of the prepared cold mix asphalt mixture, slow volatilization of the diluent, and poor water stability and frost resistance; the prepared cold mix asphalt mixture has good construction workability and road performance.

[0006] The low-viscosity reactive asphalt mixture cold mix provided in the present application comprises the following components: 100 parts by mass of base asphalt, 10 to 30 parts of solvent oil, and 5 to 25 parts of single-component polyurethane.

[0007] Preferably, the composition comprises the following components: by weight: 100 parts of base asphalt, 15 to 30 parts of solvent oil, and 20 to 25 parts of single-component polyurethane.

[0008] Preferably, the following components are included: by mass: 100 parts of base asphalt, 15 parts of solvent oil, and 25 parts of single-component polyurethane.

[0009] Based on the same inventive concept, the present application also provides a method for preparing a low-viscosity reactive asphalt mixture cold mix liquid, which is used to prepare the low-viscosity reactive asphalt mixture cold mix liquid, comprising the following steps:

[0010] The solvent oil is used as a reactive diluent and mixed with the base asphalt to obtain a diluted asphalt;

[0011] The one-component polyurethane is mixed with the diluted asphalt and stirred sufficiently to obtain the low-viscosity reactive asphalt mixture cold mix.

[0012] Preferably, during the mixing process of the solvent oil and the base asphalt, the temperature is controlled at 100-120°C and the time is controlled at 5-10 minutes;

[0013] During the mixing process of the one-component polyurethane and the diluted asphalt, the temperature is 60-80° C. and the time is 5-10 minutes.

[0014] Based on the same inventive concept, the present application also provides a low-viscosity reactive asphalt mixture, comprising the following components: in parts by mass, 4 to 6 parts of the low-viscosity reactive asphalt mixture cold mix, and 100 parts of aggregate and mineral powder in total.

[0015] Based on the same inventive concept, the present application also provides a method for preparing a low-viscosity reactive asphalt mixture, which is used to prepare the low-viscosity reactive asphalt mixture, comprising the following steps:

[0016] Preheating the low-viscosity reactive asphalt mixture cold mix, the aggregate and the mineral powder respectively;

[0017] The low-viscosity reactive asphalt mixture is obtained by mixing and stirring the preheated low-viscosity reactive asphalt mixture cold mix with the aggregate and mineral powder to obtain the low-viscosity reactive asphalt mixture.

[0018] Preferably, the preheating temperature of the low-viscosity reactive asphalt mixture cold mix is ​​controlled at 50-90°C;

[0019] The preheating temperature of the aggregate and the mineral powder is controlled at 100-120°C, and the preheating time is controlled at 4-8h;

[0020] During the mixing and stirring process of the low-viscosity reactive asphalt mixture cold mix with the aggregate and mineral powder, the temperature is controlled at 50-90° C. and the time is controlled at 3-6 minutes.

[0021] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0022] The low-viscosity reactive asphalt mixture cold mix liquid of the present application uses solvent oil as a reactive diluent for base asphalt, has high solubility, can effectively reduce the viscosity of asphalt, so that the prepared cold mix liquid has good fluidity and stability, and improves the construction and workability of the cold mix asphalt mixture; and the rapid volatilization of the solvent oil is conducive to the formation of early strength of the cold mix asphalt mixture; the single-component polyurethane is used as an additive for diluting asphalt, and the single-component polyurethane itself contains isocyanate groups, which can react with water to produce a self-curing effect, reduce the water sensitivity of the cold mix asphalt mixture, and solve the technical problem that construction cannot be carried out on rainy days; when the low-viscosity reactive asphalt mixture cold mix liquid is mixed with aggregate, the single-component polyurethane will form a chemical link between the asphalt and the aggregate, significantly enhance the adhesion between the asphalt and the aggregate, improve the strength of the cold mix asphalt mixture after molding, and extend the service life of the asphalt pavement. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The first aspect of the present invention provides a method for preparing a low-viscosity reactive asphalt mixture cold mix liquid, comprising the following steps:

[0025] (1) using solvent oil as a reactive diluent for base asphalt to obtain diluted asphalt;

[0026] (2) Adding the single-component polyurethane to the diluted asphalt obtained in step (1) and stirring the mixture to prepare a low-viscosity reactive asphalt mixture cold mix.

[0027] In the present method, the mass ratio of solvent oil to base asphalt is (10-30):100, specifically, for example, it can be 10:100, 15:100, 20:100, 25:100 or 30:100.

[0028] In the present method, in step (1), the dilution conditions include: a temperature of 100-120°C, specifically, for example, 100°C, 105°C, 110°C, 115°C or 120°C, and a time of 5-10 min, specifically, for example, 5 min, 6 min, 7 min, 8 min, 9 min or 10 min.

[0029] In the present method, in step (2), the mass ratio of the single-component polyurethane to the base asphalt is (5-25):100, specifically, for example, it can be 5:100, 10:100, 15:100, 20:100 or 25:100.

[0030] In the present method, in step (2), the stirring conditions include: a temperature of 60-80°C, specifically, for example, 60°C, 65°C, 70°C, 75°C or 80°C, and a time of 5-10 min, specifically, for example, 5 min, 6 min, 7 min, 8 min, 9 min or 10 min.

[0031] The second aspect of the present invention provides a low-viscosity reactive asphalt mixture cold mix prepared by the above method.

[0032] The third aspect of the present invention proposes a method for preparing a cold-mix asphalt mixture, wherein the low-viscosity reactive asphalt mixture cold-mix liquid, aggregate and mineral powder are preheated respectively, and then the preheated low-viscosity reactive asphalt mixture cold-mix liquid, aggregate and mineral powder are mixed.

[0033] In the method for preparing the cold mix asphalt mixture of the present invention, the aggregate may be selected conventionally in the art.

[0034] In the method for preparing the cold mix asphalt mixture of the present invention, the mineral powder may be a conventional choice in the art.

[0035] In the preparation method of cold-mix asphalt mixture of the present invention, in a preferred embodiment, the ratio of the total weight of low-viscosity reactive asphalt mixture cold mix to aggregate and mineral powder is (4-6):100, specifically, for example, 4:100, 4.5:100, 5:100, 5.5:100 or 6:100.

[0036] In the preparation method of cold-mix asphalt mixture of the present invention, in a specific implementation, the preheating temperature of aggregate and mineral powder is 100-120°C, and the preheating time is 4-8h; the low-viscosity reactive asphalt mixture cold mix is ​​preheated to a fluid state at a temperature of 50-90°C.

[0037] In the preparation method of cold-mix asphalt mixture of the present invention, in the specific operation process, the preheated low-viscosity reactive asphalt mixture cold-mix liquid and mineral powder are sequentially added to the preheated aggregate for mixing, and the specific steps are as follows:

[0038] (1) Mix the preheated aggregate at 60°C for 1 to 2 minutes;

[0039] (2) Add the low-viscosity reactive asphalt mixture cold mix to the aggregate and continue mixing for 3 to 4 minutes;

[0040] (3) The preheated mineral powder is added to the mixture of low-viscosity reactive asphalt mixture cold mix and aggregate, and the mixture is mixed for 3 to 4 minutes to obtain a cold mix asphalt mixture.

[0041] The fourth aspect of the present invention provides a cold mix asphalt mixture prepared by the above method.

[0042] The following examples further illustrate the preparation method and application of the low-viscosity reactive asphalt mixture cold mix liquid of the present invention. The examples are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples.

[0043] The experimental methods in the following examples, unless otherwise specified, are all conventional methods in the art. The experimental materials used in the following examples, unless otherwise specified, are all commercially available.

[0044] Example 1

[0045] The low-viscosity reactive asphalt mixture cold mix liquid in this embodiment is prepared from solvent oil, one-component polyurethane and base asphalt, and the cold-mix asphalt mixture is prepared from low-viscosity reactive asphalt mixture cold mix liquid, natural aggregate and natural mineral powder.

[0046] (I) Preparation of low-viscosity reactive asphalt cold mix liquid:

[0047] (1) At 100°C, 150 g of solvent oil was added to 1 kg of base asphalt for dilution and stirred for 5 min to obtain diluted asphalt;

[0048] (2) After the diluted asphalt is heated at 60° C. to a fluid state, 50 g of a one-component polyurethane is added and stirred for 5 min to prepare a low-viscosity reactive asphalt mixture cold mix;

[0049] (II) Application of low viscosity reactive asphalt cold mix liquid:

[0050] Preparation of cold-mix asphalt mixture: Select the commonly used aggregate gradation of cold-patch asphalt mixture, weigh a total of 20 kg of aggregates of corresponding sizes and mineral powder, and preheat them in a 105°C oven for 4 hours. Preheat the low-viscosity reactive asphalt mixture cold mix liquid prepared in Example 1 at 60°C to a fluid state, then add the preheated aggregate to a stirring pot at 60°C and stir for 1 to 2 minutes, then add 0.96 kg of molten low-viscosity reactive asphalt mixture cold mix liquid to the stirring pot and continue stirring for 3 to 4 minutes. Finally, add the preheated mineral powder and continue stirring for 3 to 4 minutes until no more white material appears in the mixture, and the cold-mix asphalt mixture is prepared.

[0051] Example 2

[0052] The method of Example 1 is followed, except that when preparing the low-viscosity reactive asphalt mixture cold mix, the amount of the single-component polyurethane used is 100 g.

[0053] Example 3

[0054] The method of Example 1 is followed, except that when preparing the low-viscosity reactive asphalt mixture cold mix, the amount of the single-component polyurethane used is 150 g.

[0055] Example 4

[0056] The method of Example 1 is followed, except that when preparing the low-viscosity reactive asphalt mixture cold mix, the amount of the single-component polyurethane used is 200 g.

[0057] Example 5

[0058] The method of Example 1 is followed, except that when preparing the low-viscosity reactive asphalt mixture cold mix, the amount of the single-component polyurethane used is 250 g.

[0059] Example 6

[0060] The method of Example 1 is followed, except that when preparing the low-viscosity reactive asphalt mixture cold mix, the amount of solvent oil used is 300 g, and the amount of single-component polyurethane used is 100 g.

[0061] Example 7

[0062] The method of Example 1 is followed, except that when preparing the low-viscosity reactive asphalt mixture cold mix, the amount of solvent oil used is 300 g, and the amount of single-component polyurethane used is 250 g.

[0063] Comparative Example 1

[0064] The method of Example 1 is followed, except that only solvent oil is used as the cold mix liquid.

[0065] Comparative Example 2

[0066] The method of Example 1 is followed, except that only diesel is used as the cold mix liquid.

[0067] Comparative Example 3

[0068] The method of Example 1 is followed, except that when preparing the low-viscosity reactive asphalt mixture cold mix, the single-component polyurethane is replaced with an epoxy resin in an amount of 100 g.

[0069] Test Case

[0070] Viscosity: According to the test method of "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011 T0625), the viscosity of the low-viscosity reactive asphalt mixture cold mix in the embodiment and the comparative example was tested at different test temperatures (50°C, 60°C, 70°C, 80°C and 90°C). Specific test process: (1) Place the cold mix sample in the viscosity test sample cylinder and keep it warm for 1.5 hours; (2) Insert the selected rotor into the cold mix liquid level of the sample cylinder to the specified height and continue to keep it warm for more than 15 minutes; (3) Start the viscosity test, observe the change in viscosity value, read and record after it stabilizes, and determine the average value of 3 readings;

[0071] Initial stability of cold mix: Taking the Marshall specimen height of 63.5±13mm as the control index, 1050g of cold mix was taken and placed in a 25℃ constant temperature box for 2h. Subsequently, the cold mix was taken out and loaded into the test mold, and the front and back sides of the specimen were compacted 75 times each with a Marshall compactor, and then the specimen was demoulded and placed in a 25℃ constant temperature water tank for 30min. Further, according to the test method of "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011 T 0709), the Marshall stability tester was used to perform a Marshall stability test on the above cold mix asphalt mixture specimens to evaluate the initial stability of the cold mix asphalt mixtures of the embodiments and comparative examples. The larger the value, the higher the initial strength.

[0072] Cold mix molding stability: Taking the Marshall specimen height of 63.5±13mm as the control index, take 1050g of cold mix and place it in a 25℃ constant temperature box for 2h. Subsequently, take out the cold mix and put it into the test mold, compact the front and back sides of the specimen with a Marshall compactor 50 times each, and then place it in a 60℃ constant temperature box for curing for 24h. After taking it out, compact the front and back sides with a Marshall compactor 25 times each, and cure at room temperature for 24h. After the room temperature curing is completed, water bath in a 60℃ constant temperature water tank for 30min. Further, according to the test method of "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011 T 0709), the Marshall stability tester is used to test the Marshall stability of the above cold mix asphalt mixture specimens, so as to evaluate the molding stability of the cold mix asphalt mixtures of the embodiments and comparative examples. The larger the value, the higher the molding strength.

[0073] Residual Marshall stability after immersion: According to the test method of "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011 T 0709), the Marshall stability tester was used to test the Marshall stability of the cold-mix asphalt mixture specimens of the embodiment and the comparative example. The difference from the Marshall residual stability test of the hot-mix asphalt mixture is that the water bath temperature of the cold-mix specimens is corrected to 25°C, and the temperature conditions of the two groups of specimens are controlled the same. One group of specimens was placed in a 25°C constant temperature drying oven for 48 hours, and then placed in a 25°C constant temperature water tank for immersion for 30 minutes before stability testing. Another group of specimens was immersed in a 25°C constant temperature water tank for 48 hours before stability testing. Further, the percentage of the ratio of the Marshall stability after immersion to the Marshall stability before immersion was taken as the residual stability after immersion, which was used to evaluate the water stability of the above-mentioned cold-mix asphalt mixture. The larger the value, the better the water stability.

[0074] Freeze-thaw splitting strength: According to the test method of "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011 T0729), Marshall specimens with 50 compactions on both sides were used for testing. The specific treatment method is: the specimen is vacuum-saturated with water under the condition of vacuum degree of 97.3-98.7kPa (730-740mmHg) for 15 minutes; open the valve, restore normal pressure, and place the specimen in water for 0.5 hours; take out the specimen and put it in a plastic bag, add about 10mL of water, tie the bag tightly, and put it in a -18℃ constant temperature refrigerator for 16 hours; take out the specimen and remove the plastic bag, put it in a 60℃ constant temperature water tank for 24 hours; all specimens before and after freeze-thaw are placed in a 25℃ constant temperature water tank for at least 2 hours; after taking out the specimen, the splitting strength test is carried out at a loading rate of 50mm / min, and the splitting strength is calculated by the maximum load obtained. Furthermore, the percentage of the splitting strength of the cold patch material after freeze-thaw to the splitting strength before freeze-thaw is taken as the freeze-thaw splitting strength ratio to evaluate the water stability of the cold patch material specimen after freeze-thaw. The larger the value, the better the water stability under freeze-thaw.

[0075] The viscosity of the cold mix solutions prepared in Examples 1-7 and Comparative Examples 1-3 at different temperatures was measured, and the results are shown in Table 1.

[0076] Table 1

[0077]

[0078] As can be seen from Table 1, when the amount of solvent oil remains unchanged, the increase in the amount of single-component polyurethane will gradually reduce the viscosity of the reaction-type cold-mix liquid (Examples 1-5) at different temperatures, and improve its working performance. Under the same dosage (Examples 6 and 7), increasing the amount of solvent oil will also reduce the viscosity of the cold-mix liquid, further improving its working performance. Compared with using only solvent oil and diesel as cold-mix liquid (Comparative Examples 1 and 2), the reaction-type cold-mix liquid has a lower viscosity, better working performance, and a better degree of mixing with the aggregate. However, compared with the cold-mix liquid formed by blending solvent oil and epoxy resin (Comparative Example 3), the reaction-type cold-mix liquid proposed in the present application has a more obvious viscosity advantage, showing a working performance that is easier to mix with the aggregate at a lower temperature.

[0079] The initial stability, molding stability and water-residual Marshall stability of the cold-mix asphalt mixtures prepared in Examples 1-7 and Comparative Examples 1-3 were measured respectively, and reference was made to the standard requirements for cold-mix asphalt mixtures in the art. The results are shown in Table 2.

[0080] Table 2

[0081]

[0082]

[0083] As shown in Table 2, compared with Comparative Example 1, the low-viscosity reactive cold-mix liquid prepared by the present invention using solvent oil and one-component polyurethane makes the asphalt mixture have higher initial stability, molding stability and water-residual Marshall stability (Examples 1-5), all of which meet the requirements of road performance indicators, and under the condition of a certain amount of solvent oil, the increase in the amount of one-component polyurethane will significantly improve the performance of the corresponding indicators, and can make the low-viscosity reactive cold-mix asphalt mixture show a good ability to resist external loads and water damage. At the same time, compared with Examples 6 and 7, the increase in the amount of solvent oil will reduce the corresponding performance of the low-viscosity reactive cold-mix asphalt mixture to a certain extent, but it still has good performance as a whole. In addition, as shown in Comparative Example 2, the initial stability and molding stability of the cold-mix material prepared using traditional cold-mix liquid diesel are both low, and the water-residual Marshall stability can only reach 78.9%, which is difficult to meet the technical requirements of hot-mix asphalt mixture. However, it can be seen from Comparative Example 3 that after replacing the single-component polyurethane with epoxy resin, although the corresponding index results of the cold-mixed asphalt mixture can meet the standard requirements, it is still inferior to the technical advantages of the present invention. In general, the low-viscosity reactive asphalt mixture prepared by the present application has outstanding initial stability, molding stability and water stability, and has significant technical advantages over traditional cold patch materials. Moreover, its molding strength still increases to a certain extent with the extension of service time, and its durability is significantly improved.

[0084] Table 3

[0085]

[0086]

[0087] As shown in Table 3, compared with Comparative Example 1, the splitting strength of the low-viscosity reactive cold-mix asphalt mixture (Examples 1-5) prepared by using solvent oil and one-component polyurethane in this application before and after freezing and thawing is higher, and the freeze-thaw splitting strength ratio reaches the technical requirements of hot-mix asphalt mixture, and when the amount of solvent oil is constant, increasing the amount of one-component polyurethane will significantly improve the performance of the corresponding index, and can make the low-viscosity reactive cold-mix asphalt mixture anti-freeze-thaw damage ability correspondingly improved. At the same time, it can be seen from Examples 6 and 7 that increasing the amount of solvent oil will reduce the splitting strength and freeze-thaw splitting strength ratio of the low-viscosity reactive cold-mix asphalt mixture before and after freezing and thawing to a certain extent, resulting in a decrease in its ability to resist freeze-thaw damage. In addition, it can be seen from Comparative Example 2 that the performance index results of the cold patch prepared by using traditional cold patch liquid diesel are relatively small, and the freeze-thaw splitting strength ratio is only 72.8%, which cannot meet the technical requirements of hot-mix asphalt mixture (reference). However, it can be seen from Comparative Example 3 that after replacing the single-component polyurethane with epoxy resin, although the corresponding index results of its cold-mix asphalt mixture can meet the standard requirements, it is still inferior to the technical advantages of this application. In general, the low-viscosity reactive asphalt mixture prepared in this application has outstanding performance in terms of resistance to freeze-thaw damage, and has significant technical advantages over traditional cold patch materials.

[0088] In summary, the low-viscosity reactive asphalt mixture cold mix liquid prepared by the present application is used to prepare cold-mix asphalt mixture and is used for road pothole repair. While having good working performance and road performance, it greatly solves the engineering and technical problems of traditional cold-mix asphalt mixtures, such as the inability to construct on rainy days, poor water stability, and poor frost resistance. At the same time, the low-viscosity reactive asphalt mixture cold mix liquid prepared by the present application has very important scientific significance for the development of energy-saving, environmentally friendly high-performance cold-patch asphalt mixture production technology and the improvement of asphalt pavement material maintenance technology. At the same time, the cold-mix asphalt mixture of the present application has a higher initial strength than the traditional cold-mix asphalt mixture, and its molding strength still increases to a certain extent with the extension of service time, and its durability is significantly improved.

[0089] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-viscosity reactive asphalt mixture cold mix, characterized in that: The invention comprises the following components: by weight: 100 parts of base asphalt, 10 to 30 parts of solvent oil and 5 to 25 parts of single-component polyurethane.

2. The low-viscosity reactive asphalt cold mix liquid according to claim 1, characterized in that: The invention comprises the following components: by weight, 100 parts of base asphalt, 15 to 30 parts of solvent oil and 20 to 25 parts of single-component polyurethane.

3. A method for preparing a low-viscosity reactive asphalt mixture cold mix, characterized in that: The method for preparing the low-viscosity reactive asphalt mixture cold mix according to claim 1 or 2 comprises the following steps: The solvent oil is used as a reactive diluent and mixed with the base asphalt to obtain a diluted asphalt; The one-component polyurethane is mixed with the diluted asphalt and stirred sufficiently to obtain the low-viscosity reactive asphalt mixture cold mix.

4. The method for preparing a low-viscosity reactive asphalt mixture cold mix according to claim 3, characterized in that: During the mixing process of the solvent oil and the matrix asphalt, the temperature is controlled at 100-120° C. and the time is controlled at 5-10 minutes; During the mixing process of the one-component polyurethane and the diluted asphalt, the temperature is 60-80° C. and the time is 5-10 minutes.

5. A low-viscosity reactive asphalt mixture, characterized in that: The invention comprises the following components: by weight, 4 to 6 parts of the low-viscosity reactive asphalt mixture cold mix according to claim 1 or 2, and 100 parts of aggregate and mineral powder in total.

6. A method for preparing a low-viscosity reactive asphalt mixture, characterized in that: The method for preparing the low-viscosity reactive asphalt mixture according to claim 5 comprises the following steps: Preheating the low-viscosity reactive asphalt mixture cold mix, the aggregate and the mineral powder respectively; The low-viscosity reactive asphalt mixture is obtained by mixing and stirring the preheated low-viscosity reactive asphalt mixture cold mix with the aggregate and mineral powder to obtain the low-viscosity reactive asphalt mixture.

7. The method for preparing a low-viscosity reactive asphalt mixture according to claim 6, characterized in that: The preheating temperature of the low-viscosity reactive asphalt mixture cold mix is ​​controlled at 50-90°C; The preheating temperature of the aggregate and the mineral powder is controlled at 100-120°C, and the preheating time is controlled at 4-8h; During the mixing and stirring process of the low-viscosity reactive asphalt mixture cold mix with the aggregate and mineral powder, the temperature is controlled at 50-90° C. and the time is controlled at 3-6 minutes.

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