Recycled asphalt mortar and preparation method of recycled asphalt mixture
Through the combined use of modifiers, regeneration agents, solubilizers and surfactants, the interfacial compatibility problem between aged asphalt and new asphalt is solved, and the efficient fusion and performance improvement of recycled asphalt mixture are achieved, which is suitable for asphalt pavement maintenance materials in highway engineering.
Patent Information
- Application Number
- CN202511042711.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-28
- Publication Date
- 2025-10-17
AI Technical Summary
In the existing technology, the interfacial compatibility problem between aged asphalt and regeneration agent and new asphalt has not been effectively solved, resulting in component segregation and bonding failure in the regenerated asphalt. In addition, traditional methods have high energy consumption and low regeneration efficiency, making it difficult to balance performance and environmental protection requirements.
The combined use of modifiers, regenerators, dissolution promoters and surfactants, through heating and stirring reactions, promotes the dissolution of aged asphalt in RAP fines and the full fusion of new asphalt, thereby improving the uniformity and stability of the regenerated asphalt mortar.
It significantly enhances the overall performance of recycled asphalt mixture, improves the fusion degree of new and old asphalt, and improves the crack resistance and durability of the material, making it suitable for large-scale industrial production.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a kind of recycled asphalt mortar and a kind of preparation method of recycled asphalt mixture, belong to highway engineering asphalt pavement maintenance material technical field. BACKGROUND
[0002] In the traditional asphalt recycling technology, the research focuses on the performance recovery of aging asphalt by recycling agent and the enhancement of SBS modifier, but the interface compatibility between RAP and the recycling system is not paid enough attention to. Due to the significant polarity difference and interface separation tendency between aging asphalt and recycling agent, new asphalt, the recycled asphalt is prone to component segregation, bonding failure and other problems. Although the homogeneity can be partially improved by increasing the temperature or prolonging the stirring time, the energy consumption is high and secondary aging is easy to occur. As an interface control material, surfactant has been rarely systematically studied in the field of asphalt recycling, and its potential role (such as directional adsorption, interface tension control, RAP surface activation, etc.) has been ignored for a long time, resulting in limited RAP content (usually less than 30%) and low recycling efficiency, which is difficult to balance performance and environmental protection needs. SUMMARY
[0003] The present application provides a kind of recycled asphalt mortar and a kind of preparation method of recycled asphalt mixture, by the composite use of modifier, recycling agent, solubilizing agent and surfactant, the uniformity and stability of recycled asphalt mortar are improved, and the dissolution of aging asphalt in RAP fine material and the full fusion of new asphalt are promoted, the overall performance of recycled asphalt mixture is significantly enhanced.
[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: A preparation method of recycled asphalt mortar, the base asphalt is heated to a flow state, then SBS modifier, recycling agent and solubilizing agent are added and stirred to obtain an asphalt mixture; then RAP fine material and surfactant are added to the asphalt mixture and heated and stirred to obtain recycled asphalt mortar.
[0005] Preferably, the temperature of the base asphalt heated to a flow state is 140-200℃.
[0006] Preferably, the addition amount of SBS modifier, recycling agent and solubilizing agent is 3-6%, 0.5-2% and 0.5-1.5% of the mass of base asphalt, respectively.
[0007] Preferably, after adding SBS modifier, recycling agent and solubilizing agent, stirring is carried out at a speed of 200-1500 rpm for 3-20 min.
[0008] Preferably, the addition amount of RAP fine material and surfactant is 100-500% and 0.2-1.8% of the mass of base asphalt, respectively.
[0009] Preferably, the heating and stirring reaction is at 150-200℃, 200-1000rpm, and 10-50min.
[0010] Preferably, the surfactant is at least one of sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether, and trimethyl octadecyl ammonium chloride.
[0011] A recycled asphalt mixture, comprising the following components by mass fraction: the recycled asphalt mortar of any of the above 20-40 parts, mineral powder 0.1-10 parts, aggregate 0.1-40 parts, RAP coarse material 30-60 parts, and lignin fiber 0.1-3 parts.
[0012] The preparation method of the recycled asphalt mixture described above is to mix and heat stir the aggregate and / or RAP coarse material, wood fiber and lignocellulose, then add the mineral powder and / or recycled asphalt mortar, and then stir uniformly.
[0013] The beneficial effects of the present application are: The present application improves the uniformity and stability of the recycled asphalt mortar by the combined use of the modifier, the recycling agent, the solubilizing agent, and the surfactant, and promotes the dissolution of the aged asphalt in the RAP fine material and the full fusion of the new asphalt, significantly enhancing the overall performance of the recycled asphalt mixture. In addition, the preparation method of the present application is simple and efficient, suitable for large-scale industrial production, and provides a new solution for the recycling of old asphalt pavement materials. DETAILED DESCRIPTION
[0014] In the following examples and comparative examples, the RAP fine material and the RAP coarse material are derived from the surface layer AC-13 asphalt pavement milling material of a certain expressway in Shandong Province, separated by a fine separation equipment produced by Nanfang Pavement Machinery Co., Ltd., with a particle size of ≤3 mm and a total asphalt content of 7.81% for the RAP fine material, and a particle size of ≥5 mm and a total asphalt content of 2.8% for the RAP coarse material.
[0015] The aggregate is basalt aggregate, derived from Jiangsu Expressway Engineering Maintenance Co., Ltd.
[0016] The base asphalt (70# asphalt) and the SBS modified asphalt are purchased from Jiangsu Tongsha Asphalt Technology Co., Ltd.
[0017] The SBS modifier, the recycling agent (reduced four-line oil-based recycling agent), and the solubilizing agent (coconut amide diethanol solubilizing agent) are all purchased from Jiangsu Louis Engineering Technology Co., Ltd.
[0018] Example 1: Preparation of recycled asphalt mortar, the steps are as follows: S1, heat the RAP fine material in an oven at 105°C for 3h to remove the water in it; S2, heat 500g of base asphalt to a flowable state at 160°C, then add 25g of SBS modifier, 7.5g of rejuvenator, and 5g of dissolvent, and stir at 600rpm for 10min to promote the interaction between the components and to ensure the SBS modifier is uniformly dispersed in the base asphalt, to obtain an asphalt mixture; S3, add 1000g of the dried RAP fine material and 2.5g of sodium dodecyl sulfate to the asphalt mixture, maintain the temperature at 160°C, and stir at 500rpm for 30min to ensure the old asphalt in the RAP fine material is fully dissolved and uniformly mixed with the new asphalt, to obtain a rejuvenated asphalt mortar with high rejuvenation efficiency.
[0019] Example 2: substantially the same as Example 1, except that in this example, the surfactant added is a fatty alcohol polyoxyethylene ether. The steps are as follows: S1, heat the RAP fine material in an oven at 105°C for 3h to remove the water in it; S2, heat 500g of base asphalt to a flowable state at 160°C, then add 25g of SBS modifier, 7.5g of rejuvenator, and 5g of dissolvent, and stir at 600rpm for 10min to promote the interaction between the components and to ensure the SBS modifier is uniformly dispersed in the base asphalt, to obtain an asphalt mixture; S3, add 1000g of the dried RAP fine material and 2.5g of fatty alcohol polyoxyethylene ether to the asphalt mixture, maintain the temperature at 160°C, and stir at 500rpm for 30min to ensure the old asphalt in the RAP fine material is fully dissolved and uniformly mixed with the new asphalt, to obtain a rejuvenated asphalt mortar with high rejuvenation efficiency.
[0020] Example 3: substantially the same as Example 1, except that in this example, the surfactant added is trimethyl octadecyl ammonium chloride. The steps are as follows: S1, heat the RAP fine material in an oven at 105°C for 3h to remove the water in it; S2, heat 500g of base asphalt to a flowable state at 160°C, then add 25g of SBS modifier, 7.5g of rejuvenator, and 5g of dissolvent, and stir at 600rpm for 10min to promote the interaction between the components and to ensure the SBS modifier is uniformly dispersed in the base asphalt, to obtain an asphalt mixture; S3, 1000 g of the dried RAP fine material and 2.5 g of trimethyl octadecyl ammonium chloride were added into the asphalt mixing solution, the temperature was maintained at 160 °C, and stirred at 500 rpm for 30 min to ensure that the old asphalt in the RAP fine material was fully dissolved and uniformly mixed with the new asphalt, obtaining a recycled asphalt mortar with high regeneration efficiency.
[0021] Example 4: substantially the same as Example 1, except that the surfactants added in this example are sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether. The steps are as follows: S1, the RAP fine material was heated in an oven at 105 °C for 3 h to remove the water therein; S2, 500 g of base asphalt was heated to a flowable state at 160 °C, then 25 g of SBS modifier, 7.5 g of regenerant, and 5 g of solubilizer were added, and stirred at 600 rpm for 10 min to promote the interaction between the components and uniformly disperse the SBS modifier in the base asphalt, obtaining an asphalt mixing solution; S3, 1000 g of the dried RAP fine material and 2.5 g of trimethyl octadecyl ammonium chloride were added into the asphalt mixing solution, the temperature was maintained at 160 °C, and stirred at 500 rpm for 30 min to ensure that the old asphalt in the RAP fine material was fully dissolved and uniformly mixed with the new asphalt, obtaining a recycled asphalt mortar with high regeneration efficiency.
[0022] Example 5: substantially the same as Example 1, except that the surfactants added in this example are sodium dodecyl sulfate and trimethyl octadecyl ammonium chloride. The steps are as follows: S1, the RAP fine material was heated in an oven at 105 °C for 3 h to remove the water therein; S2, 500 g of base asphalt was heated to a flowable state at 160 °C, then 25 g of SBS modifier, 7.5 g of regenerant, and 5 g of solubilizer were added, and stirred at 600 rpm for 10 min to promote the interaction between the components and uniformly disperse the SBS modifier in the base asphalt, obtaining an asphalt mixing solution; S3, 1000 g of the dried RAP fine material and 2.5 g of trimethyl octadecyl ammonium chloride were added into the asphalt mixing solution, the temperature was maintained at 160 °C, and stirred at 500 rpm for 30 min to ensure that the old asphalt in the RAP fine material was fully dissolved and uniformly mixed with the new asphalt, obtaining a recycled asphalt mortar with high regeneration efficiency.
[0023] Example 6: substantially the same as Example 1, except that the surfactant added in this example is fatty alcohol polyoxyethylene ether and trimethyl octadecyl ammonium chloride. The steps are as follows: S1, heat the RAP fine material in an oven at 105°C for 3h to remove the water therein; S2, heat 500g of base asphalt to a flowable state at 160°C, then add 25g of SBS modifier, 7.5g of rejuvenator, and 5g of dissolvent, and stir at a speed of 600rpm for 10min to promote the interaction between the components and to ensure the uniform dispersion of the SBS modifier in the base asphalt, to obtain an asphalt mixture; S3, add 1000g of the dried RAP fine material and fatty alcohol polyoxyethylene ether and trimethyl octadecyl ammonium chloride (mass ratio 1:1, total mass 2.5g) to the asphalt mixture, maintain the temperature at 160°C, and stir at a speed of 500rpm for 30min to ensure that the old asphalt in the RAP fine material is fully dissolved and uniformly mixed with the new asphalt, to obtain a rejuvenated asphalt mortar with high rejuvenation efficiency.
[0024] Comparative Example 1: substantially the same as Example 1, except that no surfactant is added in this comparative example. The steps are as follows: S1, heat the RAP fine material in an oven at 105°C for 3h to remove the water therein; S2, heat 500g of base asphalt to a flowable state at 160°C, then add 25g of SBS modifier, 7.5g of rejuvenator, and 5g of dissolvent, and stir at a speed of 600rpm for 10min to promote the interaction between the components and to ensure the uniform dispersion of the SBS modifier in the base asphalt, to obtain an asphalt mixture; S3, add 1000g of the dried RAP fine material to the asphalt mixture, maintain the temperature at 160°C, and stir at a speed of 500rpm for 30min to ensure that the old asphalt in the RAP fine material is fully dissolved and uniformly mixed with the new asphalt, to obtain a rejuvenated asphalt mortar with high rejuvenation efficiency.
[0025] The rejuvenated asphalt mortars obtained in Examples 1-6 and Comparative Example 1 were subjected to experiments on complex modulus and flexural creep stiffness according to the T0628 standard and the T0627 standard in the Highway Engineering Asphalt and Asphalt Mixture Test Procedures (JTG E20-2011), and the test results are shown in Table 1.
[0026] Table 1
[0027] As can be seen from Table 1, the complex modulus of the reclaimed asphalt mortar obtained in Examples 1-3 is significantly lower than that of the reclaimed asphalt mortar obtained in Comparative Example 1, and the complex modulus is highly related to the fusion degree of new and old asphalt, the lower the complex modulus, the higher the fusion degree of new and old asphalt, proving that the surfactant has a significant effect on improving the fusion degree of new and old asphalt; at the same time, the fracture energy of the reclaimed asphalt mortar obtained in Examples 1-3 is also significantly improved compared with Comparative Example, which shows that the addition of surfactant also improves the crack resistance and durability.
[0028] The complex modulus of Examples 4-6 is lower than that of Examples 1-3, and the fracture energy of Examples 4-6 is higher than that of Examples 1-3. It shows that the composite surfactant can more effectively reduce the complex modulus than the single surfactant, and further improve the fracture energy, which shows that it has a significant advantage in promoting the fusion of new and old asphalt and improving the performance of the material. Among them, the complex modulus and fracture energy of Example 4 perform best, which shows that the combination of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether has greater potential.
[0029] Example 7: basically the same as Example 4, the difference is that in this example, the complex ratio of surfactants sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether is 3:1. The steps are as follows: S1, heat the RAP fine material in an oven at 105°C for 3h to remove the water therein; S2, heat 500g of base asphalt to a flow state at 160°C, then add 25g of SBS modifier, 7.5g of recycling agent and 5g of solubilizer, and stir at a speed of 600rpm for 10min to promote the interaction between the components and make the SBS modifier uniformly dispersed in the base asphalt, to obtain an asphalt mixture; S3, add 1000g of dried RAP fine material and a complex solution of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether (mass ratio 3:1, total mass 2.5g) to the asphalt mixture, maintain the temperature at 160°C, and stir at a speed of 500rpm for 30min to ensure that the old asphalt in the RAP fine material is fully dissolved and uniformly mixed with the new asphalt, to obtain a reclaimed asphalt mortar with high recycling efficiency.
[0030] Example 8: basically the same as Example 4, the difference is that in this example, the complex ratio of surfactants sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether is 5:1. The steps are as follows: S1, heat the RAP fine material in an oven at 105°C for 3h to remove the water therein; S2, 500 g of base asphalt was heated to a flowable state at 160 °C, then 25 g of SBS modifier, 7.5 g of rejuvenator and 5 g of dissolvent were added and stirred at 600 rpm for 10 min to promote the interaction between the components and to ensure the uniform dispersion of the SBS modifier in the base asphalt, obtaining an asphalt mixture; S3, 1000 g of dried RAP fine material and a complex solution of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether (mass ratio 5:1, total mass 2.5 g) were added to the asphalt mixture, the temperature was maintained at 160 °C, and stirred at 500 rpm for 30 min to ensure that the old asphalt in the RAP fine material was fully dissolved and uniformly mixed with the new asphalt, obtaining a recycled asphalt mortar with high regeneration efficiency.
[0031] The recycled asphalt mortar obtained in Examples 7-8 was subjected to experiments on complex modulus and bending creep stiffness according to the T0628 standard and the T0627 standard in the Highway Engineering Asphalt and Asphalt Mixture Test Regulations (JTG E20-2011), and the test results are shown in Table 2.
[0032] Table 2
[0033] As can be seen from Table 2, after adjusting the complex ratio of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether from 1:1 (Example 4) to 3:1 (Example 7), on the one hand, the complex modulus is further reduced, indicating that the degree of fusion of new and old asphalt is higher; on the other hand, the fracture energy is significantly improved, proving that the material has better crack resistance and durability. After adjusting the complex ratio of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether from 3:1 (Example 7) to 5:1 (Example 8), the complex modulus increases and the fracture energy decreases, and the performance level is even slightly lower than that of Example 4. Through experimental verification, the complex ratio of 3:1 has a significant advantage in promoting asphalt regeneration and improving material performance, and is the preferred scheme for preparing recycled asphalt mortar.
[0034] Example 9: Preparation of asphalt mixture, the steps are as follows: 30 parts by mass of aggregate with a particle size greater than 5 mm (heated to 170 °C), 40 parts by mass of RAP coarse material with a particle size greater than 5 mm (heated to 180 °C) and 0.5 parts by mass of lignin fiber were mixed in a mixer at 170 °C and 200 rpm for 90 s, the temperature was kept constant, 20 parts by mass of recycled asphalt mortar prepared in Example 1 was added and stirred at 200 rpm for 90 s, then 5 parts by mass of mineral powder was added and stirred at 200 rpm for 90 s.
[0035] Example 10: This is basically the same as Example 9, except that the recycled asphalt mixture prepared in Example 2 is added. The steps are as follows: 30 parts by mass of aggregate with a particle size greater than 5 mm (heated to 170°C), 40 parts by mass of RAP coarse material with a particle size greater than 5 mm (heated to 180°C) and 0.5 parts by mass of lignin fiber were mixed in a blender at 170°C and 200 rpm for 90 seconds, keeping the temperature constant. First, 20 parts by mass of the regenerated asphalt mortar prepared in Example 2 was added and stirred at 200 rpm for 90 seconds, and then 5 parts by mass of mineral powder was added and stirred at 200 rpm for 90 seconds.
[0036] Example 11: This is basically the same as Example 9, except that the recycled asphalt mixture prepared in Example 3 is added. The steps are as follows: 30 parts by mass of aggregate with a particle size greater than 5 mm (heated to 170°C), 40 parts by mass of RAP coarse material with a particle size greater than 5 mm (heated to 180°C) and 0.5 parts by mass of lignin fiber were mixed in a blender at 170°C and 200 rpm for 90 seconds, keeping the temperature constant. First, 20 parts by mass of the regenerated asphalt mortar prepared in Example 3 was added and stirred at 200 rpm for 90 seconds, and then 5 parts by mass of mineral powder was added and stirred at 200 rpm for 90 seconds.
[0037] Example 12: This is basically the same as Example 9, except that the recycled asphalt mixture prepared in Example 4 is added. The steps are as follows: 30 parts by mass of aggregate with a particle size greater than 5 mm (heated to 170°C), 40 parts by mass of RAP coarse material with a particle size greater than 5 mm (heated to 180°C) and 0.5 parts by mass of lignin fiber were mixed in a blender at 170°C and 200 rpm for 90 seconds, keeping the temperature constant. First, 20 parts by mass of the regenerated asphalt mortar prepared in Example 4 was added and stirred at 200 rpm for 90 seconds, and then 5 parts by mass of mineral powder was added and stirred at 200 rpm for 90 seconds.
[0038] Example 13: This is basically the same as Example 9, except that the recycled asphalt mixture prepared in Example 5 is added. The steps are as follows: Example 14: substantially the same as Example 9, except that in this example the recycled asphalt mixture prepared in Example 6 is added. The steps are as follows:
[0039] Example 14: substantially the same as Example 9, except that in this example the recycled asphalt mixture prepared in Example 6 is added. The steps are as follows: Example 14: substantially the same as Example 9, except that in this example the recycled asphalt mixture prepared in Example 6 is added. The steps are as follows:
[0040] Example 14: substantially the same as Example 9, except that in this example the recycled asphalt mixture prepared in Example 6 is added. The steps are as follows: Example 14: substantially the same as Example 9, except that in this example the recycled asphalt mixture prepared in Example 6 is added. The steps are as follows:
[0041] Example 14: substantially the same as Example 9, except that in this example the recycled asphalt mixture prepared in Example 6 is added. The steps are as follows: Example 14: substantially the same as Example 9, except that in this example the recycled asphalt mixture prepared in Example 6 is added. The steps are as follows:
[0042] Comparative Example 2: hot recycling process steps are as follows: 2.9 parts by mass of SBS modified asphalt and 57.1 parts by mass of aggregate were heated to 170°C and 180°C respectively for standby, then 40 parts by mass of conventional RAP fine was kept in the environmental box at 140°C for 3h, after the moisture was completely dried, the aggregate and SBS modified asphalt were added in turn and then mixed in the mixer at 180°C for 90s, to prepare the recycled asphalt mixture.
[0043] Comparative Example 3: substantially the same as Example 7, except that the recycled asphalt mixture prepared in Comparative Example 1 was added in this comparative example. The steps were as follows: 30 parts by mass of aggregate with particle size greater than 5mm (heated to 170°C), 40 parts by mass of RAP coarse material with particle size greater than 5mm (heated to 180°C) and 0.5 parts by mass of lignin fiber were mixed in the mixer at 170°C, 200rpm, for 90s, keeping the temperature unchanged, 20 parts by mass of recycled asphalt mortar prepared in Comparative Example 1 was added first and stirred at 200rpm for 90s, then 5 parts by mass of mineral powder was added and stirred at 200rpm for 90s.
[0044] The recycled asphalt mixtures obtained in Examples 7-12 and Comparative Examples 2-3 were tested for dynamic stability, maximum bending tensile strain and freeze-thaw splitting strength ratio according to the T0719 standard, T0715 standard and T0729 standard in the Highway Engineering Asphalt and Asphalt Mixture Test Procedures (JTG E20-2011), and the test results are shown in Table 3.
[0045] Table 3
[0046] As can be seen from the data in Table 3, the recycled asphalt mixtures with surfactant added (Examples 9-11) are significantly superior to the recycled asphalt mixtures without surfactant added (Comparative Examples 2 and 3) in terms of high-temperature performance, low-temperature performance and water stability, and all meet the specification requirements. It is shown that the addition of surfactant significantly improves the high-temperature rutting resistance, low-temperature cracking resistance and water stability of the recycled asphalt mixture, and makes the comprehensive performance of the mixture superior to that of the traditional process by improving the interfacial compatibility and uniformity. Examples 9-11 meet the specification requirements, verifying the important role of surfactant in the preparation of high-performance recycled asphalt mixture.
[0047] Examples 12-14 use composite surfactants (sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether, sodium dodecyl sulfate and trimethyl octadecyl ammonium chloride, fatty alcohol polyoxyethylene ether and trimethyl octadecyl ammonium chloride), which significantly improve the high-temperature performance, low-temperature performance and water stability of the reclaimed asphalt mixture compared with the use of single surfactants in Examples 9-11 and compared with Comparative Examples 2-3. Among them, sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether, sodium dodecyl sulfate are used in a 1:1 compounding ratio (Examples 12-14), and the dynamic stability, maximum bending tensile strain and TSR are all better than those of single surfactants, indicating that the composite surfactants better promote the fusion of new and old asphalt through synergistic effect and improve the comprehensive performance of the material. And the use of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether in a mass ratio of 1:1 performs best (Example 12).
[0048] Further, Example 15 (sodium dodecyl sulfate:fatty alcohol polyoxyethylene ether (mass ratio) = 3:1) is significantly better than Example 12 (sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether are compounded in a mass ratio of 1:1) in high-temperature performance and low-temperature performance, while Example 16 (sodium dodecyl sulfate:fatty alcohol polyoxyethylene ether (mass ratio) = 5:1) is only comparable to Example 9 in performance. This shows that the compounding of sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether in a mass ratio of 3:1 further improves the performance of the reclaimed asphalt mixture, which is a better compounding scheme.
[0049] The above only describes the preferred embodiments of the present patent, and it should be noted that for ordinary skilled persons in the art, several improvements and refinements can be made without departing from the principles of the present patent, and these improvements and refinements should also be considered within the protection scope of the present patent.
Claims
1. A method for preparing regenerated asphalt mortar, characterized in that: The base asphalt is heated to a fluid state, and then SBS modifier, regeneration agent and solvent are added and stirred to obtain an asphalt mixture; then RAP fine material and surfactant are added to the asphalt mixture, heated and stirred to react, and regenerated asphalt mortar is obtained.
2. The method for preparing regenerated asphalt mortar according to claim 1, characterized in that: The temperature of the matrix asphalt when heated to a fluid state is 140-200°C.
3. The method for preparing regenerated asphalt mortar according to claim 1, characterized in that: The addition amounts of SBS modifier, regenerator and solubilizer are 3-6%, 0.5-2% and 0.5-1.5% of the mass of base asphalt respectively.
4. The method for preparing regenerated asphalt mortar according to claim 1, characterized in that: After adding SBS modifier, regenerator and dissolution promoter, stir at 200-1500 rpm for 3-20 minutes.
5. The method for preparing regenerated asphalt mortar according to claim 1, characterized in that: The addition amounts of RAP fines and surfactant are 100-500% and 0.2-1.8% of the mass of the base asphalt respectively.
6. The method for preparing regenerated asphalt mortar according to claim 1, characterized in that: The conditions for the heating and stirring reaction are: 150-200°C, 200-1000 rpm, 10-50 min.
7. The method for preparing regenerated asphalt mortar according to claim 1, characterized in that: The surfactant is at least one of sodium lauryl sulfate, fatty alcohol polyoxyethylene ether and trimethyl octadecyl ammonium chloride.
8. A recycled asphalt mixture, characterized in that: The invention comprises the following components in parts by mass: 20-40 parts of the regenerated asphalt mortar according to any one of claims 1 to 7, 0-10 parts of mineral powder, 0-40 parts of aggregate, 30-60 parts of RAP coarse material and 0.1-3 parts of lignin fiber.
9. The method for preparing the regenerated asphalt mixture according to claim 8, characterized in that: The method is to first mix aggregate and / or RAP coarse material and wood cellulose, heat and stir, then add mineral powder and / or recycled asphalt mortar, and then stir evenly.
10. The method for preparing recycled asphalt mixture according to claim 9, characterized in that: During the preparation process, the temperature is maintained at 150-200°C and the stirring speed is 100-500 rpm.