Preparation method of cold-resistant warm-mixed composite modified asphalt for asphalt concrete waterproof sealing layer of high-speed railway

Abstract

The invention discloses a preparation method of warm-mixed composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer. The preparation method comprises the following steps: preparing a warm-mixed liquid rubber modifier; the preparation method comprises the following steps: mixing a warm-mixed liquid rubber modifier and matrix asphalt according to a mass ratio of 35 / 65-70 / 30, and fully mixing and developing the warm-mixed liquid rubber modifier and the matrix asphalt at 110-130 DEG C to obtain a liquid rubber mother solution; the preparation method comprises the following steps: mixing 80-86 wt% of liquid rubber mother liquor, 10-15 wt% of an SBS modifier and 3-5 wt% of a compatilizer to obtain a mixture; and adding 0.3-0.5 wt% of a co-crosslinking stabilizer and 0.1-0.2 wt% of a molecular weight regulator into the mixture, and carrying out stirring development to obtain the cold-resistant warm-mixed composite modified asphalt. By optimizing a composite modification system, increasing the doping amount of the rubber modifier, improving the overall performance of the composite modified asphalt, reducing the viscosity of the composite modified asphalt and improving the construction workability, strict requirements and construction requirements of high-speed railway asphalt concrete waterproof sealing layer construction on asphalt materials in a cold region environment are met.

Description

Technical Field

[0001] This invention belongs to the technical field of asphalt material modification and asphalt concrete waterproof sealing layer for ballastless track in cold regions, specifically relating to a method for preparing warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer. Background Technology

[0002] The full-section asphalt concrete waterproof sealing layer structure for high-speed railways has been widely applied in practical engineering. Practice has shown that it can effectively prevent moisture penetration into the roadbed, thus significantly improving the long-term stability of the railway subgrade. However, in extreme climatic conditions in cold regions, the coupling effect of long-term low temperatures and freeze-thaw cycles with the train load transmitted from the upper track greatly exacerbates the service pressure on the asphalt concrete waterproof sealing layer, leading to more severe challenges during its service life. Furthermore, meeting the standard of a 60-year service life for high-speed railway subgrade waterproof sealing layers places higher demands on the low-temperature crack resistance and durability of asphalt materials.

[0003] While using high-dosage rubber modifiers can significantly improve the modification effect, simply increasing the rubber powder content brings many problems. Not only does it fail to improve the effective utilization rate of the rubber powder, but the increasingly uneven distribution of the powder also leads to poor compatibility of the modified system, affecting the storage stability of the material and making it prone to segregation and precipitation. Secondly, the viscosity of rubber-modified asphalt increases significantly, even exceeding the technical requirements of specifications, leading to higher production and compaction temperatures, resulting in high energy consumption and pollution. Especially during construction in cold regions, temperature dissipation is rapid, and the proportion of waste material tends to increase. If the compaction temperature does not meet the requirements, the volumetric properties of the mixture will not meet the standards, thus affecting long-term performance. Therefore, to solve these problems, it is necessary to use certain modification techniques to increase the rubber powder content while ensuring improved low-temperature durability, thereby reducing construction temperature, energy consumption, and improving construction efficiency. Summary of the Invention

[0004] Objective: To address the challenge of simultaneously increasing rubber powder content and improving low-temperature durability while reducing construction temperature, energy consumption, and construction efficiency, this invention proposes a method for preparing warm-mix composite modified asphalt for cold-resistant high-speed railway asphalt concrete waterproof sealing layers. The method involves specifically treating waste tire rubber powder to obtain a warm-mix liquid rubber modifier. This modifier is then mixed with base asphalt to obtain a liquid rubber masterbatch. Finally, polymers and admixtures are added and shear-blended to obtain the warm-mix composite modified asphalt for cold-resistant high-speed railway asphalt concrete waterproof sealing layers. This method significantly improves the compatibility between the modifier and asphalt, increases rubber content, and substantially reduces viscosity compared to previous methods. It also enhances the low-temperature crack resistance and durability of the asphalt and reduces negative environmental impacts, thereby effectively improving the long-term performance and service life of asphalt concrete waterproof sealing layers in cold environments.

[0005] Technical solution: A method for preparing warm-mix composite modified asphalt for a cold-resistant waterproof sealing layer of asphalt concrete for high-speed railways, comprising the following steps:

[0006] Preparation of warm-mix liquid rubber modifier;

[0007] The prepared warm-mix liquid rubber modifier and the base asphalt are mixed in a mass ratio of 35 / 65 to 70 / 30. The warm-mix liquid rubber modifier is then fully mixed and developed with the base asphalt at a temperature of 110 to 130°C to obtain a liquid rubber mother liquor.

[0008] Mix 80-86 wt% of liquid rubber masterbatch, 10-15 wt% of SBS modifier and 3-5 wt% of compatibilizer, and shear the mixture on a high-speed shearing machine to obtain a mixture; add 0.3-0.5 wt% of co-crosslinking stabilizer and 0.1-0.2 wt% of molecular weight regulator to the mixture and stir to develop it, and after stirring and development, cold-resistant warm-mix composite modified asphalt is obtained.

[0009] Furthermore, the warm-mix liquid rubber modifier is prepared according to the following steps:

[0010] The pretreated waste tire rubber powder, bio-oil and surfactant were added to a mechanically stirred reactor at a mass ratio of 100:(20-30):(2-3) and stirred to fully swell the waste tire rubber powder.

[0011] Add 2-4% by mass of H2O2 to fully swollen waste tire rubber powder, and induce oxidation regeneration of the fully swollen waste tire rubber powder in an air atmosphere to obtain a warm-mix liquid rubber modifier.

[0012] The warm-mix liquid rubber modifier is filtered to remove hard impurities and unliquefied rubber particles, and then cooled to obtain the finished warm-mix liquid rubber modifier.

[0013] Furthermore, the waste tire rubber powder, bio-oil, and surfactants are pretreated according to the following steps:

[0014] The surfactant was placed in an environment of 50℃-60℃ for 2 hours for activity pretreatment;

[0015] Pre-treat waste tire rubber powder and bio-oil by placing them in an environment of 40℃-80℃ for 2-3 hours.

[0016] Furthermore, the temperature of the mechanically stirred reactor is 40-80℃, and the stirring speed is 800r / min. The pretreated waste tire rubber powder, bio-oil, and surfactant are stirred to fully swell the waste tire rubber powder.

[0017] Furthermore, the waste tire rubber powder is rubber powder that has undergone physical damage and defiberization, and has a particle size of less than 30 mesh.

[0018] Furthermore, the bio-oil is any one type or a mixture in any proportion of epoxidized vegetable oil obtained by processing and solid-liquid separation of the residue after refining agricultural products.

[0019] Furthermore, the surfactant is at least one of tall oil diethanolamide, coconut oil fatty acid diethanolamide, and linoleic acid diethanolamide.

[0020] Furthermore, the base asphalt can be at least one of petroleum asphalt, natural asphalt, and coal tar pitch.

[0021] Furthermore, the compatibilizer is at least one of rubber oil, aromatic oil, and furfural extract oil; the co-crosslinking stabilizer is at least one of dicumyl peroxide, sulfur, and polyphosphoric acid.

[0022] Furthermore, the molecular weight regulator is at least one of phenothiazine, hydroquinone, and diphenylamine.

[0023] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0024] (1) This invention prepares a warm-mix liquid rubber modifier by adding bio-oil and surfactant to specifically treat waste tire rubber powder and inducing oxidation regeneration. The warm-mix liquid rubber modifier can quickly and evenly mix and develop with the base asphalt, significantly improve the compatibility between rubber and asphalt, increase the rubber powder content, make full use of waste tire resources, not only improve the low-temperature durability of asphalt, but also avoid the common problem of uneven rubber powder distribution.

[0025] (2) In this invention, the liquid rubber mother liquor and SBS modifier are further crosslinked under the action of compatibilizer and co-crosslinking stabilizer, and the interaction is enhanced, which promotes the formation of polymer network in asphalt, promotes the combination of composite modifier and asphalt, and can be better compatible with asphalt, significantly improving the modification effect, effectively improving the storage stability and crack resistance of asphalt, and ensuring the long-term service performance of high-speed railway asphalt concrete waterproof sealing layer in cold environment.

[0026] (3) The present invention introduces a molecular weight regulator to reasonably control the degree of crosslinking and molecular weight by promoting chain transfer reaction, control the crosslinking density, effectively reduce the viscosity of composite modified asphalt, reduce the mixing and paving temperature, and improve the workability of construction. This not only improves the construction conditions in cold regions and reduces energy consumption in the production process, but also effectively extends the construction season and meets the construction needs of waterproof sealing layer of asphalt concrete for high-speed railways in cold regions. Detailed Implementation

[0027] The technical solution of the present invention will now be further described with reference to the embodiments.

[0028] This invention proposes a method for preparing warm-mix composite modified asphalt for a cold-resistant waterproof sealing layer of asphalt concrete for high-speed railways. The method mainly includes three steps: preparing a warm-mix liquid rubber modifier, preparing a liquid rubber masterbatch, and preparing cold-resistant warm-mix composite modified asphalt. The specific operations are as follows:

[0029] Step 1: Preparation of warm-mix liquid rubber modifier: ① Place the surfactant in an environment of 50℃-60℃ for 2 hours for activity pretreatment. Place the waste tire rubber powder and bio-oil in an environment of 40℃-80℃ for 2-3 hours for preheating. Add the pretreated waste tire rubber powder, bio-oil and surfactant to a mechanically stirred reactor at a mass ratio of 100:(20~30):(2~3). Set the reactor temperature to 40-80℃ and stir at 800r / min for 2 hours to fully swell the waste tire rubber powder. ② Add 2-4% H2O2 by mass to the fully swollen waste tire rubber powder. Control the air flow rate in the reactor to 20-30ml / min. Induce oxidation and regeneration of the swollen rubber powder in an air atmosphere to obtain the warm-mix liquid rubber modifier. ③ Filter the warm-mix liquid rubber modifier through an impurity filter 10-20 times to remove hard impurities and unliquefied rubber particles. After cooling, obtain the finished warm-mix liquid rubber modifier.

[0030] In this step, the waste tire rubber powder is rubber powder that has undergone physical damage and defiberization, with a particle size of less than 30 mesh. The bio-oil is any one or a mixture in any proportion of epoxidized vegetable oil obtained from the residue after refining oil from agricultural products such as rapeseed, peanuts, soybeans, and cottonseed, through processing and solid-liquid separation. The surfactant is at least one of tall oil diethanolamide, coconut oil fatty acid diethanolamide, and linoleic acid diethanolamide. The main function of the surfactant is to optimize the surface chemical structure of the rubber powder, enhance the interaction between the warm-mix liquid rubber modifier and the base asphalt, effectively improve the viscosity of the composite modified asphalt, and reduce the interfacial tension between asphalt and aggregates. This allows for increased rubber powder content while ensuring improved low-temperature durability, while simultaneously reducing construction temperature, energy consumption, and construction efficiency.

[0031] Step 2: Preparation of liquid rubber mother liquor: The warm-mix liquid rubber modifier obtained in Step 1 and the base asphalt are mixed at a mass ratio of 35 / 65 to 70 / 30. The warm-mix liquid rubber modifier is then thoroughly mixed with the base asphalt at a temperature of 110 to 130°C for 30 minutes to obtain the liquid rubber mother liquor. In this step, the base asphalt used can be at least one of petroleum asphalt, natural asphalt, and coal tar pitch.

[0032] Step 3: Preparation of Cold-Resistant Warm-Mix Modified Asphalt: Mix 80-86 wt% of the liquid rubber mother liquor obtained in Step 2 with 10-15 wt% of SBS modifier and 3-5 wt% of compatibilizer. Then, shear the mixture at a shear rate of 5500-8000 r / min and a temperature of 110-130℃ on a high-speed shear press for 30-60 minutes to obtain a mixture. Next, add a mixture of 0.3-0.5 wt% co-crosslinking stabilizer and 0.1-0.2 wt% molecular weight regulator to the mixture. Stir at a stirring speed of 400-600 r / min for 2-3 hours, controlling the temperature at 110-130℃, and continue stirring and development. After stirring and development, cold-resistant warm-mix modified asphalt is obtained. In this step, the compatibilizer is at least one of rubber oil, aromatic oil, and furfural extract oil. The co-crosslinking stabilizer is at least one of dicumyl peroxide, sulfur, and polyphosphoric acid. The role of co-crosslinking stabilizers is to promote the formation of polymer networks in asphalt, enhance interactions, and promote the bonding between composite modifiers and asphalt, thereby optimizing the storage stability and overall performance of composite modified asphalt. Molecular weight regulators are at least one of phenothiazine, hydroquinone, and diphenylamine. The main function of these molecular weight regulators is to control the degree of crosslinking and molecular weight, inhibiting excessive crosslinking of the polymer. When the crosslinked network is excessively formed, they promote chain transfer reactions, regulate the degree of crosslinking between chain segments, and thus optimize the crosslinking uniformity in the eutectic system. This prevents excessive viscosity caused by excessively high crosslinking density during the preparation of modified asphalt, which could affect subsequent production and construction operations.

[0033] Example 1:

[0034] This embodiment proposes a method for preparing warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer, including the following steps:

[0035] Step 1: Add pretreated waste tire rubber powder, epoxidized soybean oil, and linoleic acid diethanolamide surfactants to a mechanically stirred reactor at a mass ratio of 100:20:3 to fully swell the waste tire rubber powder for 2 hours at a stirring rate of 800 r / min and a reactor temperature of 60℃. Then add 4% (by mass) of H2O2 for oxidation regeneration, controlling the air flow rate in the reactor at 30 ml / min. After filtration and cooling, the finished warm-mix liquid rubber modifier is obtained.

[0036] Step 2: Mix 35 parts by weight of warm-mix liquid rubber modifier and 65 parts by weight of 70# base asphalt thoroughly and evenly in a development tank, and develop for 30 minutes at a development temperature of 110℃ to obtain liquid rubber mother liquor.

[0037] Step 3: Mix 83wt% liquid rubber masterbatch, 12wt% SBS modifier and 5wt% rubber oil compatibilizer, and then shear on a high-speed shearing machine for 40 minutes at a shearing rate of 6000 r / min and a temperature controlled at 120℃.

[0038] Step 4: Add 0.3wt% polyphosphate co-crosslinking stabilizer and 0.1wt% hydroquinone molecular weight regulator, stir at 120℃ for 2 hours, and after thorough stirring and development, a cold-resistant high-speed railway asphalt concrete waterproof sealing layer warm mix composite modified asphalt, No. 1, is obtained.

[0039] Example 2:

[0040] This embodiment proposes a method for preparing warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer, including the following steps:

[0041] Step 1: Add pretreated waste tire rubber powder, epoxidized soybean oil, and linoleic acid diethanolamide surfactants to a mechanically stirred reactor at a mass ratio of 100:20:3 to fully swell the waste tire rubber powder for 2 hours at a stirring rate of 800 r / min and a reactor temperature of 60℃. Then add 4% (by mass) of H2O2 for oxidation regeneration, controlling the air flow rate in the reactor at 30 ml / min. After filtration and cooling, the finished warm-mix liquid rubber modifier is obtained.

[0042] Step 2: Mix 45 parts by weight of warm-mix liquid rubber modifier and 55 parts by weight of 70# base asphalt thoroughly and evenly in a development tank, and develop for 30 minutes at a development temperature of 120℃ to obtain liquid rubber mother liquor.

[0043] Step 3: Mix 83wt% of liquid rubber masterbatch, 12wt% of SBS modifier and 5wt% of rubber oil compatibilizer, and then shear on a high-speed shearing machine for 50 minutes at a shearing rate of 6500 r / min and a temperature controlled at 120℃.

[0044] Step 4: Add 0.4wt% polyphosphate co-crosslinking stabilizer and 0.2wt% hydroquinone molecular weight regulator, stir at 120℃ for 2.5 hours, and after thorough stirring and development, a cold-resistant high-speed railway asphalt concrete waterproof sealing layer warm mix composite modified asphalt, No. 2, is obtained.

[0045] Example 3:

[0046] This embodiment proposes a method for preparing warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer, including the following steps:

[0047] Step 1: Add pretreated waste tire rubber powder, epoxidized soybean oil, and linoleic acid diethanolamide surfactants to a mechanically stirred reactor at a mass ratio of 100:20:3 to fully swell the waste tire rubber powder for 2 hours at a stirring rate of 800 r / min and a reactor temperature of 60℃. Then add 4% (by mass) of H2O2 for oxidation regeneration, controlling the air flow rate in the reactor at 30 ml / min. After filtration and cooling, the finished warm-mix liquid rubber modifier is obtained.

[0048] Step 2: Mix 55 parts by weight of warm-mix liquid rubber modifier and 45 parts by weight of 70# base asphalt thoroughly and evenly in a development tank, and develop for 30 minutes at a development temperature of 130℃ to obtain liquid rubber mother liquor.

[0049] Step 3: Mix 83wt% of liquid rubber masterbatch, 12wt% of SBS modifier and 5wt% of rubber oil compatibilizer, and then shear on a high-speed shearing machine for 60 minutes at a shearing rate of 7000 r / min and a temperature of 130℃.

[0050] Step 4: Add 0.5wt% polyphosphate co-crosslinking stabilizer and 0.2wt% hydroquinone molecular weight regulator, stir at 130℃ for 3 hours, and after thorough stirring and development, a cold-resistant high-speed railway asphalt concrete waterproof sealing layer warm mix composite modified asphalt, No. 3, is obtained.

[0051] Comparative Example 1:

[0052] Prepare composite modified asphalt for comparing the effects of different technologies by following these steps:

[0053] Step 1: Add pretreated waste tire rubber powder, epoxidized soybean oil, and linoleic acid diethanolamide surfactants to a mechanically stirred reactor at a mass ratio of 100:20:3 to fully swell the waste tire rubber powder for 2 hours at a stirring rate of 800 r / min and a reactor temperature of 60℃. Then add 4% (by mass) of H2O2 for oxidation regeneration, controlling the air flow rate in the reactor at 30 ml / min. After filtration and cooling, the finished warm-mix liquid rubber modifier is obtained.

[0054] Step 2: Mix 35 parts by weight of the warm-mixed liquid rubber modifier from step (1) and 65 parts by weight of 70# base asphalt thoroughly and evenly in a development tank, and develop for 30 minutes at a development temperature of 110℃ to obtain liquid rubber mother liquor.

[0055] Step 3: Mix the 83wt% liquid rubber mother liquor obtained in step (2) with 12wt% SBS modifier and 5wt% rubber oil compatibilizer, and then shear it on a high-speed shearing machine for 40 minutes at a shearing rate of 6000 r / min and a temperature of 130℃.

[0056] Step 4: Add 0.3wt% polyphosphate co-crosslinking stabilizer. As the co-crosslinking degree of the aforementioned shearing process deepens, the viscosity of the system increases sharply. The stirring temperature is increased to 150℃ and stirred for 2 hours. After thorough stirring and development, the composite modified asphalt, numbered 4, is obtained.

[0057] Comparative Example 2:

[0058] Prepare composite modified asphalt for comparing the effects of different technologies by following these steps:

[0059] Step 1: Add pretreated waste tire rubber powder and epoxidized soybean oil to a mechanically stirred reactor at a mass ratio of 100:30 to fully swell the waste tire rubber powder for 2 hours. The stirring rate is 800 r / min, and the reactor temperature is set to 70℃. Then add 4% (by mass) of H2O2 for oxidation regeneration, controlling the air flow rate in the reactor to 20 ml / min. After filtration and cooling, a liquid rubber modifier is obtained.

[0060] Step 2: Mix 35 parts by weight of liquid rubber modifier and 65 parts by weight of 70# base asphalt thoroughly and evenly in a development tank, and develop for 30 minutes at a development temperature of 130℃ to obtain liquid rubber mother liquor.

[0061] Step 3: Mix 83wt% of liquid rubber mother liquor, 12wt% of SBS modifier and 5wt% of rubber oil compatibilizer, and then shear on a high-speed shearing machine for 60 minutes at a shearing rate of 7000 r / min. Since the system is too viscous at this time, it cannot be sheared within the range of 110-130℃. The shearing temperature needs to be controlled at 170℃.

[0062] Step 4: Add 0.3wt% polyphosphate co-crosslinking stabilizer and 0.1wt% hydroquinone molecular weight regulator, stir at 170℃ for 3 hours, and after thorough stirring and development, obtain composite modified asphalt, number 5.

[0063] According to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20—2011), the composite modified asphalts prepared in Examples 1-3 and Comparative Examples 1-2 were tested, and the test results are shown in Table 1 below.

[0064] Table 1. Comparison of the performance of composite modified asphalt obtained from the examples and comparative examples.

[0065]

[0066] The test results in the table above show that warm-mix composite modified asphalt has excellent low-temperature performance and durability. The incorporation of surfactants, warm-mix liquid rubber modifiers, and molecular weight regulators significantly improves the viscosity of asphalt. Comparative Example 1, which did not add molecular weight regulators, and Comparative Example 2, which did not add surfactants, both showed significantly higher asphalt viscosity than the other three groups. The shear temperature and stirring temperature during preparation were significantly increased, and the ductility was lower. The segregation test reflects the stability of asphalt. The asphalt without molecular weight regulators showed poorer stability than the other groups, further verifying the superiority of composite modified asphalt containing molecular weight regulators in terms of storage stability. The above data can well demonstrate that by optimizing the composite modification system through this invention, the overall performance of composite modified asphalt can be effectively improved, the viscosity of composite modified asphalt can be reduced, and the workability and construction can be improved, thereby meeting the strict requirements and construction needs of asphalt materials for the construction of waterproof sealing layers of asphalt concrete for high-speed railways in cold environments.

Claims

1. A method for preparing warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer, characterized in that: Includes the following steps: Preparation of warm-mix liquid rubber modifier; The prepared warm-mix liquid rubber modifier and the base asphalt are mixed in a mass ratio of 35 / 65 to 70 / 30. The warm-mix liquid rubber modifier is then fully mixed and developed with the base asphalt at a temperature of 110 to 130°C to obtain a liquid rubber mother liquor. Mix 80-86 wt% of liquid rubber masterbatch, 10-15 wt% of SBS modifier and 3-5 wt% of compatibilizer, and shear the mixture on a high-speed shearing machine to obtain a mixture; add 0.3-0.5 wt% of co-crosslinking stabilizer and 0.1-0.2 wt% of molecular weight regulator to the mixture and stir to develop it, and after stirring and development, cold-resistant warm-mix composite modified asphalt is obtained.

2. The method for preparing a warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer according to claim 1, characterized in that: Prepare the warm-mix liquid rubber modifier according to the following steps: The pretreated waste tire rubber powder, bio-oil and surfactant were added to a mechanically stirred reactor at a mass ratio of 100:(20-30):(2-3) and stirred to fully swell the waste tire rubber powder. Add 2-4% by mass of H2O2 to fully swollen waste tire rubber powder, and induce oxidation regeneration of the fully swollen waste tire rubber powder in an air atmosphere to obtain a warm-mix liquid rubber modifier. The warm-mix liquid rubber modifier is filtered to remove hard impurities and unliquefied rubber particles, and then cooled to obtain the finished warm-mix liquid rubber modifier.

3. The method for preparing a warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer according to claim 2, characterized in that: Waste tire rubber powder, bio-oil, and surfactants are pretreated according to the following steps: The surfactant was placed in an environment of 50℃-60℃ for 2 hours for activity pretreatment; Pre-treat waste tire rubber powder and bio-oil by placing them in an environment of 40℃-80℃ for 2-3 hours.

4. The method for preparing a warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer according to claim 2, characterized in that: The temperature of the mechanically stirred reactor is 40-80℃, and the stirring speed is 800r / min. The pretreated waste tire rubber powder, bio-oil and surfactant are stirred to fully swell the waste tire rubber powder.

5. The method for preparing a warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer according to claim 2, characterized in that: The waste tire rubber powder is rubber powder that has undergone physical damage and defiberization, and has a particle size of less than 30 mesh.

6. The method for preparing a warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer according to claim 2, characterized in that: The bio-oil is any one type or a mixture in any proportion of epoxidized vegetable oil obtained by processing and solid-liquid separation of the residue after refining agricultural products.

7. The method for preparing a warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer according to claim 2, characterized in that: The surfactant is at least one of tall oil diethanolamide, coconut oil fatty acid diethanolamide, and linoleic acid diethanolamide.

8. The method for preparing a warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer according to claim 1, characterized in that: The base asphalt can be at least one of petroleum asphalt, natural asphalt, and coal tar pitch.

9. The preparation method of warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer according to claim 1, characterized in that: The compatibilizer is at least one of rubber oil, aromatic oil and furfural extract oil; the co-crosslinking stabilizer is at least one of dicumyl peroxide, sulfur and polyphosphoric acid.

10. The method for preparing a warm-mix composite modified asphalt for a cold-resistant high-speed railway asphalt concrete waterproof sealing layer according to claim 1, characterized in that: The molecular weight regulator is at least one of phenothiazine, hydroquinone, and diphenylamine.

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