Self-repairing rubber asphalt and preparation method thereof

Abstract

The present application relates to the technical field of asphalt mixtures, and specifically discloses a self-repairing rubber asphalt and a preparation method thereof. A self-repairing rubber asphalt, the raw materials for preparing the rubber asphalt include the following components by weight: 60-90 parts of base asphalt, 5-20 parts of EPDM rubber, 2-5 parts of a modified regeneration agent, 4-12 parts of carbon fiber, and 2-5 parts of nano-silica; the modified regeneration agent is an aromatic oil coated with a phenol-modified urea-formaldehyde resin. The present application adds a modified regeneration agent, carbon fiber, and nano-silica to the base asphalt, so that when microcracks are generated in the asphalt pavement, the carbon fiber blocks further cracking of the microcracks, the modified regeneration agent can restore the performance of the aged asphalt, and the nano-silica undergoes a new bonding reaction with the asphalt molecules to fill the microcracks, delaying the cracking time of the asphalt pavement and reducing the labor intensity of the workers.

Description

Technical Field

[0001] The present application relates to the field of asphalt mixtures, and in particular to a self-repairing rubber asphalt and a preparation method thereof. Background Art

[0002] Asphalt roads are widely used due to their excellent physical properties, good road performance and ease of construction. In addition, their low economic cost makes them the preferred choice for road construction.

[0003] Over the long term, asphalt in traditional asphalt roads gradually ages. Combined with environmental factors and vehicle loads, this can lead to rutting, cracking, and other defects, severely impacting the safety and efficiency of transportation. Therefore, maintaining and repairing asphalt pavement is a long-term and arduous task.

[0004] Currently, asphalt pavement repairs usually involve workers sealing cracks with asphalt mixtures or spraying repair agents on cracked areas. However, these maintenance methods are complex, time-consuming, and labor-intensive, significantly increasing workers' workload. Summary of the Invention

[0005] To reduce the workload of workers repairing asphalt pavements, this application provides a self-repairing rubber asphalt and its preparation method. By adding a modified regeneration agent, carbon fiber, and nano-silica to the base asphalt, the carbon fiber prevents further cracking of the asphalt pavement when microcracks develop. The modified regeneration agent restores the properties of aged asphalt, and the nano-silica forms new bonding reactions with asphalt molecules to fill the microcracks, delaying the onset of cracking and reducing the workload of workers.

[0006] In the first aspect, the present application provides a self-repairing rubber asphalt, which adopts the following technical solution:

[0007] A self-repairing rubber asphalt. The raw materials for preparing the rubber asphalt include the following components, measured by weight: 60-90 parts of base asphalt, 5-20 parts of EPDM rubber, 2-5 parts of a modified regeneration agent, 4-12 parts of carbon fiber, and 2-5 parts of nano-silica; the modified regeneration agent is an aromatic oil coated with a phenol-modified urea-formaldehyde resin.

[0008] By adopting the above technical solution, aromatic oil is coated with phenol-modified urea-formaldehyde resin and then mixed into asphalt. On the one hand, it can delay the aging of aromatic oil during the use of asphalt pavement. On the other hand, when the asphalt pavement is subjected to significant pressure, the "capsule wall" will be squeezed and broken, releasing the aromatic oil. The aromatic oil can penetrate into the aged asphalt, dissolve and disperse the asphaltene in the aged asphalt, soften the asphalt, and restore the performance of the asphalt, thereby promoting the self-repair of microcracks in the asphalt pavement.

[0009] Carbon fiber is a high-strength, high-modulus material that improves the mechanical properties and crack resistance of asphalt. When microcracks appear in asphalt pavement, the carbon fiber can absorb some of the stress, preventing further cracking. Nanosilica, with its small particle size and high surface area, can be evenly dispersed in the matrix asphalt, improving its microstructure and enhancing its viscosity and strength. When microcracks develop in asphalt pavement, the carbon fiber can prevent them from expanding. Simultaneously, the nanosilica can form new chemical bonds with asphalt molecules, filling the pores in the microcracks. The two work synergistically to enhance the asphalt's self-healing ability, delaying the onset of cracking and thus reducing the workload on workers.

[0010] EPDM rubber added to the matrix asphalt can react with some components in the asphalt, enhance the cohesion and bonding strength of the asphalt, and improve the high-temperature stability and low-temperature crack resistance of the asphalt.

[0011] Preferably, the mass ratio of the carbon fiber to the nano-silicon dioxide is (2-4):1.

[0012] By adopting the above technical solution, further adjusting the mass ratio of carbon fiber to nano-silica will help improve the synergy between the two and enhance the self-repairing ability of asphalt pavement for microcracks.

[0013] In some preferred embodiments, the mass ratio of carbon fiber to nano-silica can be 2:1, 3:1 or 4:1, etc.

[0014] Preferably, the length of the carbon fiber is 4-9 mm.

[0015] By adopting the above technical solution, the length of the carbon fiber is controlled within the above range, which helps to improve the crack resistance and durability of the asphalt. If the length of the carbon fiber is too long, it is easy to agglomerate during the mixing process and cannot be evenly dispersed in the asphalt, affecting the mechanical properties of the asphalt; if the length of the carbon fiber is too short, it will affect the crack resistance of the asphalt, and when microcracks occur in the asphalt pavement, it will not be able to effectively prevent the cracks from expanding, making it difficult to improve the self-repairing performance of the asphalt.

[0016] As an example, the modified regeneration agent is prepared by the following method:

[0017] A1. Mix urea and formaldehyde solution, adjust the pH to 8-10, heat to 60-80°C while stirring, and react for 0.5-2h to prepare a prepolymer solution;

[0018] A2. Add sodium stearate and polyoxyethylene laurate into water and mix well to prepare an aqueous solution;

[0019] A3, mixing the aromatic oil and the aqueous phase solution, shearing and emulsifying at 8000-12000 rpm to obtain an emulsion;

[0020] A4. The prepolymer solution and the emulsion are mixed uniformly, the pH is adjusted to 2-4, and the mixture is reacted at 50-70° C. for 0.5-1.5 h. A phenol solution is added, the mixture is reacted for 1-3 h, the pH is adjusted to 7-9, and the mixture is cooled to obtain a modified regeneration agent.

[0021] By adopting the above technical solution, urea-formaldehyde resin is used to encapsulate aromatic oil, delaying its aging. When microcracks form in the asphalt pavement under high pressure, the resin will break, releasing the aromatic oil and restoring the properties of the aged asphalt. However, urea-formaldehyde resin has poor water resistance, which may cause the aromatic oil to be released prematurely. Therefore, phenol is used to modify the urea-formaldehyde resin to improve its water resistance and durability, allowing it to release the aromatic oil when microcracks form in the asphalt pavement, thereby enhancing the asphalt's self-healing ability.

[0022] In some specific embodiments, in step A1, a 10% by volume sodium hydroxide solution is used to adjust the pH to 9; in step A4, a 1% by volume hydrochloric acid is used to adjust the pH to 3, and after adding the phenol solution, a 20% by volume sodium hydroxide solution is used to adjust the pH to 8.

[0023] Preferably, the mass ratio of sodium stearate to polyoxyethylene laurate is (3-7):1.

[0024] By adopting the above technical solution, sodium stearate contains polar and non-polar groups. When the aqueous solution and aromatic oil are mixed, the sodium stearate molecules are oriented at the oil-water interface, reducing the surface tension of the oil-water interface and allowing the two to mix into a stable emulsion. Polyoxyethylene laurate molecules have significant steric hindrance. When they adsorb at the oil-water interface, they form a dense protective layer around the droplets, effectively preventing the droplets from coalescing and further enhancing the stability of the emulsion. The combination of the two can significantly improve the dispersibility of the aromatic oil in the emulsion and optimize the coating effect of the urea-formaldehyde resin.

[0025] In some preferred embodiments, the mass ratio of sodium stearate to polyoxyethylene laurate can be 3:1, 5:1 or 7:1, etc.

[0026] Preferably, the volume ratio of the aromatic oil to the aqueous solution is 1:(2-4).

[0027] By adopting the above technical solution, the volume ratio of aromatic oil to aqueous solution is further limited, which helps to improve the dispersibility of aromatic oil in the emulsion, thereby ensuring the subsequent coating effect of urea-formaldehyde resin on the aromatic oil.

[0028] In some preferred embodiments, the volume ratio of the aromatic oil to the aqueous solution can be 1:2, 1:3, or 1:4, etc.

[0029] Preferably, the volume ratio of the prepolymer solution to the emulsion is (1-3):1.

[0030] By adopting the above technical solution, the volume ratio of the prepolymer solution and the emulsion is further adjusted, which helps to improve the coating effect of urea-formaldehyde resin on aromatic oil. If the amount of prepolymer solution added is too much, the production cost will be increased in vain. If the amount of prepolymer solution added is too little, the urea-formaldehyde resin will not be completely coated on the aromatic oil, and the aromatic oil may age. When microcracks appear on the asphalt pavement, there is not enough aromatic oil to restore the performance of the aged asphalt, thereby affecting the self-repairing ability of the asphalt.

[0031] In some preferred embodiments, the volume ratio of the prepolymer solution to the emulsion can be 1:1, 2:1, or 3:1, etc.

[0032] In a second aspect, the present application provides a method for preparing self-repairable rubber asphalt, which adopts the following technical solution:

[0033] A method for preparing self-repairing rubber asphalt comprises the following steps: heating base asphalt to 120-140° C., adding carbon fiber and nano-silicon dioxide to the base asphalt and stirring and dispersing the mixture; heating the mixture to 140-160° C., adding EPDM rubber thereto, mixing the mixture evenly, adding a modified regeneration agent, and stirring the mixture at 4000-7000 rpm for 0.5-1 hour to obtain the rubber asphalt.

[0034] By adopting the above technical solution, the preparation method of rubber asphalt is simple, highly operational, and suitable for mass production without the need for specially customized equipment. The prepared rubber asphalt has good adhesion, weather resistance and excellent self-repairing properties, and can repair microcracks generated in asphalt pavement, reducing the labor intensity of workers.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] 1. The application incorporates aromatic oil coated with phenol-modified urea-formaldehyde resin, which can slow down the aging process of the aromatic oil. When microcracks form inside the asphalt pavement under tremendous pressure, the "capsule" is squeezed and ruptured by the pressure, releasing the aromatic oil, which then penetrates into the surrounding aged asphalt, dissolving and dispersing the asphaltene in the aged asphalt, restoring the properties of the aged asphalt, and thus promoting the self-repair of microcracks in the asphalt pavement.

[0037] 2. This application mixes carbon fiber and nano-silica into the matrix asphalt. When microcracks appear inside the asphalt pavement, the carbon fiber can withstand the stress of partial cracking and prevent the expansion of microcracks. Nano-silica will form new bonds with the asphalt molecules, thereby filling the microcracks, delaying the time for the asphalt pavement to crack, and reducing the workload of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a flow chart for the preparation of the modified regenerating agent of Preparation Example 1 in this application. DETAILED DESCRIPTION

[0039] To make this application easier to understand, the following examples will be used to further illustrate this application. These examples are for illustrative purposes only and are not intended to limit the scope of application of this application. Unless otherwise specified, the raw materials or components used in this application can be obtained through commercial channels or conventional methods.

[0040] Source of raw materials

[0041] The matrix asphalt was 70# asphalt purchased from Shandong Zhongyitong New Materials Co., Ltd.

[0042] EPDM rubber, brand Dow, grade 3765, ash content 0.2%;

[0043] Aromatic oil, active ingredient content is 85%, kinematic viscosity is 15-45m 2 / s, density is 1.04-1.08g / cm 3 , flash point>180℃; carbon fiber, purchased from Jiangxi Shuobang New Material Technology Co., Ltd.;

[0044] Nanosilica, CAS number 10279-57-9, was purchased from Dachun (Hebei) Building Materials Technology Co., Ltd.

[0045] Polyoxyethylene laurate, with an active ingredient content of 99%, was purchased from Xingtai Xinlanxing Technology Co., Ltd.

[0046] Preparation Example 1:

[0047] Reference Figure 1The preparation method of the modified regeneration agent in Preparation Example 1 is as follows: A1, 500g of urea was added to 2L of 37% formaldehyde solution by volume, and after stirring at 500rpm for 5min, 10% sodium hydroxide solution by mass was added dropwise to adjust the pH to 9, and the mixture was heated to 70°C while stirring, and reacted for 1h to obtain a prepolymer solution; A2, 100g of sodium stearate and 20g of polyoxyethylene laurate were added to 1L of water, and stirred at 800rpm for 5min to obtain an aqueous phase solution; A3. Mix 0.33 L of aromatic oil with the aqueous phase solution, shear and emulsify at 10,000 rpm for 5 minutes to obtain an emulsion; A4. Mix 2 L of the prepolymer solution and 1 L of the emulsion, stir at 3,000 rpm for 10 minutes, add 1% hydrochloric acid dropwise thereto to adjust the pH to 3, heat to 60°C to react for 1 hour, then add 20 g of phenol solution, continue the reaction for 2 hours, and adjust the pH to 8 using 10% sodium hydroxide solution. After cooling, obtain a modified regeneration agent.

[0048] Preparation Example 2:

[0049] The difference between Preparation Example 2 and Preparation Example 1 is that the amounts of sodium stearate and polyoxyethylene laurate added in step A2 are different, the amount of sodium stearate added is 90 g, the amount of polyoxyethylene laurate added is 30 g, the mass ratio of sodium stearate to polyoxyethylene laurate is 3:1, and the rest are the same as Preparation Example 1.

[0050] Preparation Example 3:

[0051] The difference between Preparation Example 3 and Preparation Example 1 is that the amounts of sodium stearate and polyoxyethylene laurate added in step A2 are different, the amount of sodium stearate added is 105 g, the amount of polyoxyethylene laurate added is 15 g, the mass ratio of sodium stearate to polyoxyethylene laurate is 7:1, and the rest are the same as Preparation Example 1.

[0052] Preparation Example 4-5:

[0053] The difference between Preparation Example 4-5 and Preparation Example 1 is that the amount of aromatic oil added to the emulsion is different. The amount of aromatic oil added in Preparation Examples 4-5 is 0.5 L and 0.25 L, respectively. The rest is the same as Preparation Example 1.

[0054] Preparation Example 6-7:

[0055] The difference between Preparation Examples 6-7 and Preparation Example 1 is that the amount of prepolymer solution added in step A4 is different. The amount of prepolymer solution added in Preparation Examples 6-7 is 1 L and 3 L, respectively. The rest is the same as Preparation Example 1.

[0056] Example 1-3:

[0057] The raw materials and dosages for preparing the rubber asphalt in Examples 1-3 are shown in Table 1. The modified regeneration agent prepared in Preparation Example 1 was used as the modified regeneration agent, and the carbon fibers were 6 mm in length. The rubber asphalt in Examples 1-3 was prepared as follows: 70# asphalt was heated to 130°C to melt, and then carbon fibers and nanosilica were added to the 70# asphalt, stirred and dispersed at 5000 rpm for 60 minutes. The mixture was then heated to 150°C, EPDM rubber was added, and stirring continued at 5000 rpm for 60 minutes. The modified regeneration agent was then added, and stirring continued at 5000 rpm for 40 minutes to produce the rubber asphalt.

[0058] Example 4-5:

[0059] The raw materials and dosages for preparing the rubber asphalt in Example 4-5 are shown in Table 1. The difference from Example 1 is that the dosages of carbon fiber and nano-silica are different. The mass ratios of carbon fiber and nano-silica in Example 4-5 are 2:1 and 4:1, respectively. The rest are the same as in Example 1.

[0060] Table 1. Raw materials and dosage of rubber asphalt in Examples 1-5 (kg)

[0061] Example 1 Example 2 Example 3 Example 4 Example 5 70# asphalt 80 90 60 80 80 EPDM 14 5 20 14 14 Modified regeneration agent 4 5 2 4 4 carbon fiber 9 12 4 8 9.6 Nanosilica 3 2 5 4 2.4

[0062] Example 6-7:

[0063] The difference between Examples 6-7 and Example 1 is that the lengths of the carbon fibers are 4 mm and 9 mm, respectively, and the rest are the same as Example 1.

[0064] Examples 8-13:

[0065] The difference between Examples 8-13 and Example 1 is that the modified regeneration agents are the modified regeneration agents prepared in Preparation Examples 2-7, respectively, and the rest are the same as Example 1.

[0066] Comparative Example 1:

[0067] The difference between Comparative Example 1 and Example 1 is that an equal amount of aromatic oil is used to replace the modified regeneration agent, and the rest is the same as Example 1.

[0068] Comparative Example 2:

[0069] The difference between Comparative Example 2 and Example 1 is that no phenol solution is added during the preparation of the modified regeneration agent, that is, an equal amount of urea-formaldehyde resin-coated aromatic oil is used to replace the modified regeneration agent, and the rest is the same as Example 1.

[0070] Application Examples 1-13:

[0071] In Application Examples 1-13, the rubber asphalt prepared in Examples 1-13 was used to prepare asphalt mixtures. The aggregate used was diabase, and the filler was limestone powder. The asphalt mixture had an AC-13 gradation, and the gradation design was based on JTG F40-2004, "Technical Specifications for Highway Asphalt Pavement Construction" (see Table 2). The asphalt-to-stone ratio of the asphalt mixture was 4.8%. The asphalt mixtures in Application Examples 1-13 were prepared as follows: the aggregate was heated to 150°C, stirred at 500 rpm for 10 seconds, and then the rubber asphalt was added. The temperature was raised to 170°C, and stirred at 500 rpm for 30 seconds to produce the asphalt mixture.

[0072] Table 2. Gradation range of AC-13 asphalt mixture

[0073]

[0074] Comparative Application Example 1-2:

[0075] The difference between comparative application examples 1-2 and application example 1 is that the rubber asphalt prepared in comparative examples 1-2 is respectively selected, and the rest is the same as application example 1.

[0076] Test Example 1:

[0077] The performance of the rubber asphalt prepared in Examples 1-13 and Comparative Examples 1-2 was tested, including softening point, ductility at 5°C, and penetration at 25°C, with reference to Sections T0606, T0605, and T0604 of JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures for Highway Engineering". The test data are shown in Table 2.

[0078] Table 3

[0079] Softening point (℃) 5℃ elongation (cm) 25℃ needle penetration (0.1mm) Example 1 78.7 35.4 51.4 Example 2 68.3 29.8 55.7 Example 3 66.1 27.6 56.5 Example 4 71.6 31.7 53.6 Example 5 74.8 32.5 52.5 Example 6 76.0 30.2 53.0 Example 7 76.9 35.9 52.8 Example 8 77.5 34.7 52.0 Example 9 78.0 35.0 51.8 Example 10 77.2 33.1 53.2 Example 11 77.6 34.3 52.6 Example 12 73.5 32.1 53.5 Example 13 75.4 32.9 52.2 Comparative Example 1 65.6 25.4 60.9 Comparative Example 2 70.1 29.5 58.7

[0080] The test data in Table 3 show that the rubber asphalt prepared in Examples 1-13 and Comparative Examples 1-2 has a softening point of 65.6-78.7°C, an ductility of 25.4-35.9 cm at 5°C, and a needle penetration of 51.4-60.9 mm (0.1 mm) at 25°C. Adding aromatic oil and EPDM rubber to the base asphalt increases the asphalt's softening point and reduces its needle penetration, while the addition of carbon fiber significantly increases the asphalt's ductility and enhances its flexibility and plasticity.

[0081] Test Example 2:

[0082] The self-repairing performance of the asphalt mixture prepared in the corresponding use case 1-13 and the comparative application example 1-2 was tested. The specific method is as follows: S1. The asphalt mixture was made into 6 small beam specimens with a length of 250.0 mm ± 2.0 mm, a width of 30.0 mm ± 2.0 mm, and a height of 35.0 ± 2.0 mm; S2. The low-temperature maximum bending strain of the three small beam specimens was tested with reference to JTG F40-2004 "Technical Specifications for Highway Asphalt Pavement Construction"; S3. The remaining three small beam specimens were fixed and fatigue loaded on the small beam specimens using an asphalt mixture bending tester. The real-time flexural deformation was recorded by the data acquisition system until the system stopped loading when the small beam reached the predetermined mid-span flexural deformation and maintained for 2 hours; S4. The small beam specimen in S3 was pulled back to the initial position, the specimen was taken out, and placed at 25°C for 12 hours; S5. According to F40-2004, "Technical Specifications for Highway Asphalt Pavement Construction," the maximum low-temperature flexural strain of three small beam specimens in S4 was tested and their self-repair capacity was calculated (self-repair capacity = maximum low-temperature flexural strain of S5 / maximum low-temperature flexural strain of S2). For specific data, see Table 4.

[0083] Table 4

[0084]

[0085] It can be seen from the test data in Table 4 that the self-repairing capabilities of the asphalt mixtures prepared in Application Examples 1-13 and Comparative Application Examples 1-2 are 73.4-35.2%.

[0086] The test data from Application Examples 1-5 demonstrate that the rubber asphalt prepared in Example 1 exhibits stronger self-healing capabilities. The raw material ratio is more appropriate, with the modified regeneration agent, carbon fiber, and nano-silica playing a significant role. Furthermore, it can be seen that when the mass ratio of carbon fiber to nano-silica is 3:1, the synergistic effect between the two is even greater, significantly enhancing the self-healing ability of the asphalt mixture.

[0087] It can be seen from the test data of Application Examples 1 and 6-7 that the length of carbon fiber also has a significant impact on the self-repairing ability of asphalt mixture. The test data in this application show that the self-repairing ability of rubber asphalt mixed with 6mm carbon fiber is stronger. This may be because 6mm carbon fiber can ensure its dispersion in asphalt while being able to withstand the stress of micro-cracks to a greater extent.

[0088] From the test data of Application Example 1 and Comparative Application Examples 1-2, it can be seen that the use of aromatic oil coated with phenol-modified urea-formaldehyde resin as a regeneration agent has a greater improvement on the self-repairing ability of asphalt. This may be because the uncoated aromatic oil will mix with the matrix asphalt during the stirring of the asphalt mixture and play a smaller role in the self-repair process, while the coated aromatic oil will be released only when microcracks are generated in the asphalt mixture, penetrate into the microcracks and react with the asphalt to repair the microcracks.

[0089] It can be seen from the test data of Application Examples 1 and 8-13 that in the preparation process of the modified regeneration agent, the addition amount of some substances has an important influence on the effect of the modified regeneration agent. For example, when the mass ratio of sodium stearate and polyoxyethylene laurate is 5:1, the effect of the modified regeneration agent is better; when the volume ratio of aromatic oil to emulsion is close to 1:3, the emulsification and dispersion effect of aromatic oil is better, thereby improving the performance of the modified regeneration agent; when the volume ratio of prepolymer solution to emulsion is 2:1, the phenol-modified phenolic resin has a better coating effect on aromatic oil, thereby improving the performance of the modified regeneration agent.

[0090] It should be noted that the embodiments described above are only used to explain the present application and do not constitute any limitation to the present application. The present application has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present application may be modified as specified within the scope of the claims of the present application, and the invention may be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and embodiments, it does not mean that the present application is limited to the specific examples disclosed therein. On the contrary, the present application can be extended to all other methods and applications with the same function.

Claims

1. A self-repairing rubber asphalt, characterized by: The raw materials for preparing the rubber asphalt include the following components by weight: 60-90 parts of base asphalt, 5-20 parts of EPDM rubber, 2-5 parts of modified regeneration agent, 4-12 parts of carbon fiber and 2-5 parts of nano-silicon dioxide; The modified regeneration agent is aromatic oil coated with phenol-modified urea-formaldehyde resin; The mass ratio of the carbon fiber to the nano-silicon dioxide is (2-4):1; The length of the carbon fiber is 4-9 mm; The modified regenerating agent is prepared by the following method: A1. Mix urea and formaldehyde solution, adjust the pH to 8-10, heat to 60-80°C while stirring, and react for 0.5-2h to prepare a prepolymer solution; A2. Add sodium stearate and polyoxyethylene laurate into water and mix well to prepare an aqueous solution; A3, mixing the aromatic oil and the aqueous phase solution, shearing and emulsifying at 8000-12000 rpm to obtain an emulsion; A4, mixing the prepolymer solution and the emulsion evenly, adjusting the pH to 2-4, reacting at 50-70° C. for 0.5-1.5 h, adding phenol solution, continuing the reaction for 1-3 h, adjusting the pH to 7-9, and cooling to obtain a modified regeneration agent; The mass ratio of sodium stearate to polyoxyethylene laurate is 5:1; The volume ratio of the aromatic oil to the aqueous solution is 1:3; The volume ratio of the prepolymer solution to the emulsion is 2:

1.

2. A method for preparing the self-repairable rubber asphalt according to claim 1, characterized in that: The preparation method comprises the following steps: heating base asphalt to 120-140° C., adding carbon fiber and nano-silicon dioxide into the base asphalt and stirring to disperse, heating to 140-160° C. and adding EPDM rubber thereto, mixing evenly and then adding a modified regeneration agent, stirring at 4000-7000 rpm for 0.5-1 hour to obtain rubber asphalt.

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