Anti-rutting agent modified asphalt, anti-rutting and anti-stripping asphalt concrete and preparation method thereof

Abstract

The application discloses an anti-rutting agent modified asphalt, anti-rutting and anti-stripping asphalt concrete and a preparation method thereof. The anti-rutting and anti-stripping asphalt concrete is prepared from components including the following components in parts by mass: 125-136 parts of anti-rutting agent modified asphalt, 5-10 parts of cement, 1-5 parts of anti-stripping agent, 2-5 parts of polyester fiber, 1800-2200 parts of aggregate, 150-200 parts of mineral powder and 22-26 parts of rock asphalt ash. The anti-rutting and anti-stripping asphalt concrete can significantly improve the adhesion between asphalt and aggregate, improve the Marshall stability of asphalt concrete, the freeze-thaw splitting tensile strength and the rutting dynamic stability. On the other hand, the rock asphalt and ash are effectively used as the additive and / or internal admixture of the asphalt concrete, which not only reduces the material cost, prolongs the stability of the functional agent, but also reduces the overuse of the chemical functional agent and protects the ecology.

Description

Technical Field

[0001] This invention belongs to the field of road engineering, and particularly relates to an anti-rutting agent modified asphalt, anti-rutting and anti-stripping asphalt concrete and its preparation method. Background Technology

[0002] With economic development and the widespread use of transportation, the construction and maintenance of highways and roads have received increasing attention. Asphalt concrete, as an important pavement material, has a significant impact on road safety, service life, and maintenance costs due to its performance and quality. However, in actual use, asphalt concrete often suffers from problems such as rutting and spalling due to factors such as traffic load, temperature changes, and moisture, reducing the pavement's service life and safety, and bringing many difficulties to traffic management and maintenance.

[0003] To address the aforementioned issues, scholars both domestically and internationally have conducted relevant research. To tackle rutting and spalling problems in asphalt pavements, anti-rutting agents and anti-stripping agents have been developed. However, traditional anti-rutting agents are mostly chemical additives, which suffer from problems such as short-lasting resistance, environmental pollution, high cost, and negative impacts on other properties of asphalt concrete. Furthermore, commonly used asphalt anti-stripping agents are cationic amines or metal soaps. While these two types of asphalt anti-stripping agents are effective in improving the adhesion between asphalt and aggregates, the thermal decomposition of amines reduces their anti-stripping properties, while cationic anti-stripping agents debond from the aggregates upon heating, affecting the performance of the asphalt mixture. Exploring and developing natural, stable, readily available, environmentally friendly, and energy-saving anti-rutting and anti-stripping agents for use in asphalt pavements has gradually become a research hotspot.

[0004] Chinese patent CN101955335 A, "An anti-rutting agent for road asphalt concrete and its preparation method," uses maleic anhydride-grafted modified polyolefin, polyolefin, inorganic mineral filler, rock asphalt, etc., fully mixed, and prepared by melt extrusion, pelletizing, and drying. The dosage in asphalt concrete is 0.4%. Based on the high modulus characteristics of extrusion granulation, the asphalt concrete prepared by this method can significantly improve the anti-rutting performance. Chinese patent CN110642555 A, "A red mud-based nano-anti-stripping agent and its preparation method and application," uses red mud, hydrated lime, white mud, fly ash, surfactant, etc., mixed and ball-milled to prepare a red mud-based nano-anti-stripping agent powder. Using organic-inorganic composite modification technology, it develops a high-performance asphalt anti-stripping agent with coordinated structural stability, adhesion, and compatibility, solving the problem of weak adhesion between acidic granite aggregate and asphalt. However, the above material systems and preparation processes are complex, and the particle size of the materials used is difficult to control precisely. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide rutting-resistant modified asphalt, rutting-resistant and spalling-resistant asphalt concrete, and a method for preparing the same.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A method for preparing rutting-resistant modified asphalt includes the following steps: heating 100-120 parts of base asphalt to 145-150°C by mass, then adding 10-15 parts of dried rock asphalt, stirring and heating to 155-160°C, adding 3-5 parts of ash and stirring again, adding 5-10 parts of dispersant and 2-4 parts of defoamer, and stirring until uniform.

[0008] Preferably, the dried rock asphalt is prepared by the following steps: drying the rock asphalt at 105°C for 2 hours.

[0009] Preferably, the ash is prepared by the following steps: dried rock asphalt is placed in a high-temperature furnace at a constant temperature of 900±10℃ and calcined until constant weight (the difference in mass between two consecutive weighings is not greater than 0.3mg).

[0010] Preferably, the dispersant is at least one of nano-titanium dioxide, vinyl bis-stearamide, calcium stearate, and sodium hexametaphosphate.

[0011] Preferably, the defoamer is at least one of polyoxyethylene polyoxypropylene pentaerythritol ether, tributyl phosphate, methyl silicone oil, and attapulgite.

[0012] The rutting-resistant modified asphalt prepared by the above-mentioned method is an example of rutting-resistant modified asphalt.

[0013] A rutting-resistant and spalling-resistant asphalt concrete is prepared from components comprising the following parts by weight:

[0014] 125-136 parts of rutting-resistant modified asphalt, 5-10 parts of cement, 1-5 parts of anti-stripping agent, 2-5 parts of polyester fiber, 1800-2200 parts of aggregate, 150-200 parts of mineral powder and 22-26 parts of rock asphalt ash.

[0015] Preferably, the anti-stripping agent is prepared by the following method: 100-120 parts by weight of rock asphalt is dissolved in 300-480 parts by weight of organic solvent and subjected to ultrasonic treatment. The ultrasonically treated sample is centrifuged to obtain a primary precipitate and a primary treatment liquid. The color of the upper layer of the primary treatment liquid is recorded. 300-480 parts by weight of organic solvent is added to 100-120 parts by weight of the primary precipitate, and the same ultrasonic treatment and centrifugation treatment are performed. This process is repeated multiple times until the color of the upper layer of the treatment liquid remains stable. The precipitate is dried and ground to obtain the asphalt anti-stripping agent.

[0016] Preferably, the organic solvent is at least one of toluene, trichloroethylene, and carbon tetrachloride.

[0017] Preferably, the rock asphalt is at least one of Buton rock asphalt, North American rock asphalt, and Qingchuan rock asphalt.

[0018] Preferably, the rock asphalt ash content is prepared according to the method of "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011 T 0614-2011.

[0019] Preferably, the aggregate is at least one of limestone, basalt, diabase and granite.

[0020] The above-mentioned method for preparing rutting-resistant and spalling-resistant asphalt concrete includes the following steps: First, the rutting-resistant modified asphalt is heated to 150-160°C, then mixed and stirred with aggregate preheated to 180-185°C, cement, spalling agent, and polyester fiber are added and mixed, then mineral powder and rock asphalt ash are added and mixed, and finally molded to obtain the rutting-resistant and spalling-resistant asphalt concrete.

[0021] The principle behind the anti-peeling properties of the product prepared by this invention is as follows:

[0022] Rock asphalt and ash primarily enhance the high-temperature stability, shear resistance, and adhesion of asphalt. Rock asphalt exhibits good compatibility with base asphalt, while ash further enhances the high-temperature stability, shear resistance, and adhesion of rock asphalt-modified base asphalt. The rough surface and numerous micropores of ash's microstructure may increase its contact area with the base asphalt, thereby enhancing its resistance to spalling. Furthermore, rock asphalt is rich in asphalt-like organic components and high-temperature stable inorganic components, which may enhance the adhesion and bonding strength of the base asphalt, thus improving spalling resistance. Additionally, the excellent compatibility between rock asphalt and base asphalt may also contribute to improved spalling resistance. Considering these factors, it can be concluded that the anti-rutting mechanism of asphalt modified with anti-rutting agents may be achieved through increasing the contact area, improving adhesion and bonding strength, and promoting compatibility.

[0023] Compared with the prior art, the beneficial effects of the present invention include:

[0024] This invention, based on the composition and chemical properties of rock asphalt ash, utilizes dry and wet methods to prepare rock asphalt ash. Taking advantage of the good compatibility between rock asphalt and asphalt, the dry-process ash and rock asphalt are combined to prepare an anti-rutting modified asphalt. Simultaneously, the dry-process ash partially replaces the amount of mineral powder used. Furthermore, the wet-process ash, along with cement and polyester fiber, enhances the adhesion between asphalt and aggregates. Following the JTG E20-2011 asphalt concrete preparation process, an anti-rutting and anti-stripping asphalt concrete is prepared. The anti-rutting and anti-stripping asphalt concrete prepared based on rock asphalt not only significantly improves the adhesion performance between asphalt and aggregates, increases the Marshall stability, freeze-thaw splitting tensile strength, and rutting dynamic stability of asphalt concrete, but also effectively utilizes rock asphalt and ash as admixtures and / or internal additives in asphalt concrete. This not only reduces material costs and prolongs the stability of functional agents but also reduces the excessive use of chemical functional agents, protects the ecology, and solves environmental pollution problems, demonstrating significant environmental, economic, and social benefits. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] The cement used in the examples and comparative examples is 325 cement produced by Conch Cement; the polyester fiber is crack-resistant polyester fiber provided by Shandong Baiyou Engineering Materials Co., Ltd.; and the aggregate is limestone.

[0027] The ash content of the rock asphalt was prepared according to the method of "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011T0614-2011.

[0028] The rock bitumen described in the example is Buton rock bitumen.

[0029] Example 1

[0030] A method for preparing anti-rutting agent modified asphalt includes the following steps: 110 parts by mass of base asphalt (90# base asphalt produced by Panjin Northern Asphalt Fuel Co., Ltd.) are heated to 145-150℃, 10 parts of dried (dried at 105℃ for 2 hours) rock asphalt are added and stirred for 8 minutes, the temperature is raised to 155℃, 4 parts of dry-prepared ash are added and stirred for 8 minutes, 8 parts of nano-titanium dioxide and 3 parts of polyoxyethylene polyoxypropylene pentaerythritol ether are added and stirred for 8 minutes. The stirring shear rate is 2300 rpm. After stirring, anti-rutting agent modified asphalt is obtained.

[0031] The ash prepared by the dry method is prepared according to the following steps: the dried rock bitumen is placed in a high-temperature furnace at a constant temperature of 900±10℃ and calcined until constant weight (the difference in mass between two consecutive weighings is not greater than 0.3mg).

[0032] The anti-stripping agent was prepared according to the following method:

[0033] By mass, 110 parts of rock bitumen were dissolved in 350 parts of carbon tetrachloride, and the mixture was ultrasonicated for 8 minutes. After ultrasonic treatment, the sample was centrifuged to obtain a primary precipitate and a primary treatment liquid. The color of the upper layer of the primary treatment liquid was recorded. 350 parts of carbon tetrachloride were added to 110 parts of the primary precipitate, and the same ultrasonic and centrifugation treatments were performed. This process was repeated multiple times until the color of the upper layer of the treatment liquid on the RAL colorimetric card remained stable. The precipitate was dried in an oven at 50°C, and then ground and sieved to obtain ash with a maximum nominal particle size of no more than 0.6 mm prepared by the wet method of rock bitumen.

[0034] A rutting-resistant and spalling-resistant asphalt concrete is prepared from the following components in parts by weight:

[0035] The mixture consists of 124 parts of rutting-resistant modified asphalt, 6 parts of cement, 2 parts of anti-stripping agent, 3 parts of polyester fiber, 1900 parts of aggregate, 160 parts of mineral powder, and 22 parts of rock asphalt ash.

[0036] The rutting-resistant modified asphalt is heated to 155°C, then mixed with aggregate preheated to 180°C for 90 seconds. Cement, anti-stripping agent, and polyester fiber are added and mixed for 90 seconds. Then mineral powder and rock asphalt ash are added and mixed for 90 seconds. Finally, the mixture is molded to obtain the rutting-resistant and anti-stripping asphalt concrete.

[0037] Example 2

[0038] A method for preparing anti-rutting agent modified asphalt includes the following steps: 110 parts by mass of base asphalt (90# base asphalt produced by Panjin Northern Asphalt Fuel Co., Ltd.) are heated to 145-150℃, 12 parts of dried (dried at 105℃ for 2 hours) rock asphalt are added and stirred for 9 minutes, the temperature is raised to 156℃, 5 parts of dry-prepared ash are added and stirred for 9 minutes, 9 parts of nano-titanium dioxide and 3 parts of polyoxyethylene polyoxypropylene pentaerythritol ether are added and stirred for 8 minutes. The stirring shear rate is 2400 rpm. After stirring, anti-rutting agent modified asphalt is obtained.

[0039] The ash prepared by the dry method is prepared according to the following steps: the dried rock bitumen is placed in a high-temperature furnace at a constant temperature of 900±10℃ and calcined until constant weight (the difference in mass between two consecutive weighings is not greater than 0.3mg).

[0040] The anti-stripping agent was prepared according to the following method:

[0041] By mass, 115 parts of rock bitumen were dissolved in 360 parts of carbon tetrachloride, and the mixture was ultrasonicated for 9 minutes. After ultrasonic treatment, the sample was centrifuged to obtain a primary precipitate and a primary treatment liquid. The color of the upper layer of the primary treatment liquid was recorded. 360 parts of carbon tetrachloride were added to 115 parts of the primary precipitate, and the same ultrasonic and centrifugation treatments were performed. This process was repeated multiple times until the color of the upper layer of the treatment liquid on the RAL colorimetric card remained stable. The precipitate was dried in an oven at 50°C, and then ground and sieved to obtain ash with a maximum nominal particle size of no more than 0.6 mm prepared by the wet method of rock bitumen.

[0042] A rutting-resistant and spalling-resistant asphalt concrete is prepared from the following components in parts by weight:

[0043] The mixture consists of 128 parts of rutting-resistant modified asphalt, 7 parts of cement, 3 parts of anti-stripping agent, 4 parts of polyester fiber, 2000 parts of aggregate, 170 parts of mineral powder, and 23 parts of rock asphalt ash.

[0044] The rutting-resistant modified asphalt is heated to 155°C, then mixed with aggregate preheated to 180°C for 90 seconds. Cement, anti-stripping agent, and polyester fiber are added and mixed for 90 seconds. Then mineral powder and rock asphalt ash are added and mixed for 90 seconds. Finally, the mixture is molded to obtain the rutting-resistant and anti-stripping asphalt concrete.

[0045] Example 3

[0046] A method for preparing anti-rutting agent modified asphalt includes the following steps: 120 parts by mass of base asphalt (90# base asphalt produced by Panjin Northern Asphalt Fuel Co., Ltd.) are heated to 145-150℃, 13 parts of dried (dried at 105℃ for 2 hours) rock asphalt are added and stirred for 10 minutes, the temperature is raised to 155℃, 5 parts of dry-prepared ash are added and stirred for 10 minutes, 9 parts of nano-titanium dioxide and 3 parts of polyoxyethylene polyoxypropylene pentaerythritol ether are added and stirred for 10 minutes. The stirring shear rate is 2500 rpm. After stirring, anti-rutting agent modified asphalt is obtained.

[0047] The ash prepared by the dry method is prepared according to the following steps: the dried rock bitumen is placed in a high-temperature furnace at a constant temperature of 900±10℃ and calcined until constant weight (the difference in mass between two consecutive weighings is not greater than 0.3mg).

[0048] The anti-stripping agent was prepared according to the following method:

[0049] By mass, 120 parts of rock bitumen were dissolved in 370 parts of carbon tetrachloride, and the mixture was ultrasonicated for 10 minutes. After ultrasonic treatment, the sample was centrifuged to obtain a primary precipitate and a primary treatment liquid. The color of the upper layer of the primary treatment liquid was recorded. 370 parts of carbon tetrachloride were added to 120 parts of the primary precipitate, and the same ultrasonic and centrifugation treatments were performed. This process was repeated multiple times until the color of the upper layer of the treatment liquid on the RAL colorimetric card remained stable. The precipitate was dried in an oven at 50°C, and then ground and sieved to obtain ash with a maximum nominal particle size of no more than 0.6 mm prepared by the wet method of rock bitumen.

[0050] A rutting-resistant and spalling-resistant asphalt concrete is prepared from the following components in parts by weight:

[0051] The mixture consists of 132 parts of rutting-resistant modified asphalt, 8 parts of cement, 4 parts of anti-stripping agent, 5 parts of polyester fiber, 2100 parts of aggregate, 180 parts of mineral powder, and 26 parts of rock asphalt ash.

[0052] The rutting-resistant modified asphalt is heated to 155°C, then mixed with aggregate preheated to 180°C for 90 seconds. Cement, anti-stripping agent, and polyester fiber are added and mixed for 90 seconds. Then mineral powder and rock asphalt ash are added and mixed for 90 seconds. Finally, the mixture is molded to obtain the rutting-resistant and anti-stripping asphalt concrete.

[0053] Example 4

[0054] A method for preparing anti-rutting agent modified asphalt includes the following steps: 120 parts by mass of base asphalt (90# base asphalt produced by Panjin Northern Asphalt Fuel Co., Ltd.) are heated to 145-150℃, 14 parts of dried (dried at 105℃ for 2 hours) rock asphalt are added and stirred for 10 minutes, the temperature is raised to 158℃, 5 parts of dry-prepared ash are added and stirred for 10 minutes, 10 parts of nano-titanium dioxide and 4 parts of polyoxyethylene polyoxypropylene pentaerythritol ether are added and stirred for 10 minutes. The stirring shear rate is 2500 rpm. After stirring, anti-rutting agent modified asphalt is obtained.

[0055] The ash prepared by the dry method is prepared according to the following steps: the dried rock bitumen is placed in a high-temperature furnace at a constant temperature of 900±10℃ and calcined until constant weight (the difference in mass between two consecutive weighings is not greater than 0.3mg).

[0056] The anti-stripping agent was prepared according to the following method:

[0057] By mass, 120 parts of rock bitumen were dissolved in 420 parts of carbon tetrachloride, and the mixture was ultrasonicated for 10 minutes. After ultrasonic treatment, the sample was centrifuged to obtain a primary precipitate and a primary treatment liquid. The color of the upper layer of the primary treatment liquid was recorded. 420 parts of carbon tetrachloride were added to 120 parts of the primary precipitate, and the same ultrasonic and centrifugation treatments were performed. This process was repeated multiple times until the color of the upper layer of the treatment liquid on the RAL colorimetric card remained stable. The precipitate was dried in an oven at 50°C, and then ground and sieved to obtain ash with a maximum nominal particle size of no more than 0.6 mm prepared by the wet method of rock bitumen.

[0058] A rutting-resistant and spalling-resistant asphalt concrete is prepared from the following components in parts by weight:

[0059] The mixture consists of 136 parts of rutting-resistant modified asphalt, 9 parts of cement, 5 parts of anti-stripping agent, 5 parts of polyester fiber, 2200 parts of aggregate, 190 parts of mineral powder, and 24 parts of rock asphalt ash.

[0060] The rutting-resistant modified asphalt is heated to 160°C, then mixed with aggregate preheated to 185°C for 90 seconds. Cement, anti-stripping agent, and polyester fiber are added and mixed for 90 seconds. Then mineral powder and rock asphalt ash are added and mixed for 90 seconds. Finally, the mixture is molded to obtain the rutting-resistant and anti-stripping asphalt concrete.

[0061] Example 5

[0062] A method for preparing anti-rutting agent modified asphalt includes the following steps: 120 parts by mass of base asphalt (90# base asphalt produced by Panjin Northern Asphalt Fuel Co., Ltd.) are heated to 145-150°C, 15 parts of dried (dried at 105°C for 2 hours) rock asphalt are added and stirred for 10 minutes, the temperature is raised to 155°C, 5 parts of dry-prepared ash are added and stirred for 10 minutes, 10 parts of nano-titanium dioxide and 3 parts of polyoxyethylene polyoxypropylene pentaerythritol ether are added and stirred for 10 minutes. The stirring shear rate is 2600 rpm. After stirring, anti-rutting agent modified asphalt is obtained.

[0063] The ash prepared by the dry method is prepared according to the following steps: the dried rock bitumen is placed in a high-temperature furnace at a constant temperature of 900±10℃ and calcined until constant weight (the difference in mass between two consecutive weighings is not greater than 0.3mg).

[0064] The anti-stripping agent was prepared according to the following method:

[0065] By mass, 120 parts of rock bitumen were dissolved in 480 parts of carbon tetrachloride, and the mixture was ultrasonicated for 10 minutes. After ultrasonic treatment, the sample was centrifuged to obtain a primary precipitate and a primary treatment liquid. The color of the upper layer of the primary treatment liquid was recorded. 480 parts of carbon tetrachloride were added to 120 parts of the primary precipitate, and the same ultrasonic and centrifugation treatments were performed. This process was repeated multiple times until the color of the upper layer of the treatment liquid on the RAL colorimetric card remained stable. The precipitate was dried in an oven at 50°C, and then ground and sieved to obtain ash with a maximum nominal particle size of no more than 0.6 mm prepared by the wet method of rock bitumen.

[0066] A rutting-resistant and spalling-resistant asphalt concrete is prepared from the following components in parts by weight:

[0067] The mixture consists of 135 parts of rutting-resistant modified asphalt, 10 parts of cement, 5 parts of anti-stripping agent, 5 parts of polyester fiber, 2200 parts of aggregate, 200 parts of mineral powder, and 26 parts of rock asphalt ash.

[0068] The rutting-resistant modified asphalt is heated to 160°C, then mixed with aggregate preheated to 185°C for 90 seconds. Cement, anti-stripping agent, and polyester fiber are added and mixed for 90 seconds. Then mineral powder and rock asphalt ash are added and mixed for 90 seconds. Finally, the mixture is molded to obtain the rutting-resistant and anti-stripping asphalt concrete.

[0069] Comparative Example 1

[0070] An asphalt concrete is prepared from the following components in parts by weight:

[0071] 124 parts of 90# base asphalt, 6 parts of cement, 2 parts of anti-stripping agent, 3 parts of polyester fiber, 1900 parts of aggregate, 160 parts of mineral powder, and 22 parts of rock asphalt ash.

[0072] The preparation method of the asphalt concrete described in Comparative Example 1 is the same as that in Example 1, except that the anti-rutting agent modified asphalt is not added, and 90# base asphalt is used instead.

[0073] Comparative Example 2

[0074] An asphalt concrete is prepared from the following components in parts by weight:

[0075] 124 parts of 90# base asphalt, 8 parts of cement, 3 parts of polyester fiber, 1900 parts of aggregate, and 182 parts of mineral powder.

[0076] 90# base asphalt is heated to 155℃, then mixed with aggregate preheated to 180℃ for 90 seconds, cement and polyester fiber are added and mixed for 90 seconds, then mineral powder is added and mixed for 90 seconds, and then the mixture is molded to obtain asphalt concrete.

[0077] Based on the asphalt concrete specimens prepared in Examples 1-5 and Comparative Examples 1-2, dynamic stability, rutting depth, Marshall stability, freeze-thaw splitting strength ratio, and adhesion energy level were tested. The tests were conducted in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011. The test results are shown in Table 1.

[0078] Table 1. Performance overview of asphalt concrete specimens prepared in Examples 1-5 and Comparative Examples 1-2

[0079]

[0080] As can be seen from the test data in Table 1, the asphalt concrete prepared by this invention has excellent performance in terms of resistance to permanent deformation, Marshall stability, freeze-thaw splitting strength ratio, and adhesion properties, and has high value for promotion and application.

[0081] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rutting-resistant and spalling-resistant asphalt concrete, characterized in that, It is prepared from components comprising the following parts by mass: 125-136 parts of anti-rutting agent modified asphalt, 5-10 parts of cement, 1-5 parts of anti-stripping agent, 2-5 parts of polyester fiber, 1800-2200 parts of aggregate, 150-200 parts of mineral powder and 22-26 parts of rock asphalt ash; The preparation method of the rutting-resistant modified asphalt includes the following steps: 100-120 parts by weight of base asphalt are heated to 145-150°C, then 10-15 parts of dried rock asphalt are added, stirred and heated to 155-160°C, 3-5 parts of ash are added and stirred again, then 5-10 parts of dispersant and 2-4 parts of defoamer are added and stirred until homogeneous. The anti-stripping agent is prepared as follows: 100-120 parts by weight of rock asphalt is dissolved in 300-480 parts by weight of organic solvent and subjected to ultrasonic treatment. The ultrasonically treated sample is centrifuged to obtain a primary precipitate and a primary treatment liquid. The color of the upper layer of the primary treatment liquid is recorded. 300-480 parts by weight of organic solvent is added to 100-120 parts by weight of the primary precipitate, and the same ultrasonic treatment and centrifugation are performed. This process is repeated multiple times until the color of the upper layer of the treatment liquid remains stable. The precipitate is then dried and ground to obtain the asphalt anti-stripping agent.

2. The rutting-resistant and spalling-resistant asphalt concrete according to claim 1, characterized in that, The dried rock asphalt was prepared by the following steps: the rock asphalt was dried at 105°C for 2 hours.

3. The rutting-resistant and spalling-resistant asphalt concrete according to claim 2, characterized in that, The ash is prepared by calcining dried rock bitumen at 900±10℃ until constant weight.

4. The rutting-resistant and spalling-resistant asphalt concrete according to any one of claims 1 to 3, characterized in that, The dispersant is at least one of nano-titanium dioxide, vinyl bis-stearamide, calcium stearate, and sodium hexametaphosphate.

5. The rutting-resistant and spalling-resistant asphalt concrete according to claim 4, characterized in that, The defoamer is at least one of polyoxyethylene polyoxypropylene pentaerythritol ether, tributyl phosphate, methyl silicone oil, and attapulgite.

6. The rutting-resistant and spalling-resistant asphalt concrete according to claim 1, characterized in that, The rock bitumen is at least one of Buton rock bitumen, North American rock bitumen, and Qingchuan rock bitumen.

7. The rutting-resistant and spalling-resistant asphalt concrete according to claim 1, characterized in that, The aggregate is at least one of limestone, basalt, diabase and granite.

8. The method for preparing rutting-resistant and spalling-resistant asphalt concrete according to any one of claims 1 to 7, characterized in that, The process includes the following steps: First, the rutting-resistant modified asphalt is heated to 150~160℃, then mixed with aggregate preheated to 180~185℃, cement, anti-stripping agent, and polyester fiber are added and mixed, then mineral powder and rock asphalt ash are added and mixed, and finally molded to obtain the rutting-resistant and anti-stripping asphalt concrete.

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