Asphalt recycling agent suitable for cold and hot mixing as well as preparation method and application of asphalt recycling agent

Abstract

The invention relates to an asphalt regenerant suitable for cold and hot mixing, which comprises the following components in parts by mass: 100 parts of waste engine oil, 50-78 parts of polymerized MDI and 20-55 parts of solvent oil, the asphalt recycling agent suitable for cold and hot mixing, which is prepared by melting and blending the polymerized MDI, the waste engine oil and the solvent oil, has excellent diffusivity in aged asphalt, can be used for mixing recycled asphalt mixtures at different temperatures such as cold mixing, hot mixing and the like, and can effectively reduce emission of toxic gases and reduce secondary pollution to the environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of road engineering material resource utilization and recycling, in particular to a cold-temperature hot-mixing suitable asphalt regenerant, a preparation method and application thereof. BACKGROUND

[0002] Asphalt pavement plays an important role in highway engineering in China. In recent years, with the development of cities and the increase of traffic volume year by year, the asphalt gradually ages under the influence of long-term service and thermal-oxidative aging and other natural environmental factors, resulting in a serious decline in the road performance of the asphalt mixture, and the aged asphalt mixture needs to be milled. The waste asphalt mixture obtained by milling is usually piled up and buried, which is not conducive to the environment and also causes a lot of resource waste. Considering the recycling of waste asphalt mixture, a large amount of natural aggregates, asphalt and other non-renewable resources can be saved, and the environmental damage and waste of land resources caused by large-scale stone mining can be reduced. Therefore, high-performance recycling and recycling of waste asphalt mixture has become a hot issue in the field of road materials.

[0003] At present, some progress has been made in the recycling of waste asphalt mixture, mainly focusing on the use of asphalt regenerant. The asphalt regenerant can penetrate into the asphalt surface layer and aged asphalt by using its excellent compatibility and diffusion performance, and then improve the road performance of the recycled asphalt mixture. However, the current regenerant only physically recycles the aged asphalt, and does not fundamentally react and repair the components in the aged asphalt, so the overall performance of the aged asphalt mixture often cannot be significantly improved.

[0004] At the same time, the waste asphalt mixture currently mainly adopts hot-mixing recycling, and the recycling mixing temperature and compaction temperature are usually 5-15℃ higher than those of new asphalt mixture, i.e. in the range of 175-190℃. The traditional recycling method cannot meet the needs of the increasingly severe road traffic conditions, and the traditional hot-mixing recycling method produces a large amount of harmful gases such as asphalt smoke, causing secondary pollution to the ecological environment. SUMMARY

[0005] The present application provides a cold-temperature hot-mixing suitable asphalt regenerant and a preparation method thereof, which solves or partially solves the environmental problems that the current recycling method cannot meet the needs of the increasingly severe road traffic conditions and produces a large amount of harmful gases such as asphalt smoke, causing secondary pollution to the ecological environment.

[0006] The cold-temperature hot-mixing suitable asphalt regenerant provided by the present application comprises the following components: 100 parts of waste engine oil, 50-78 parts of polymeric MDI and 20-55 parts of solvent oil, by mass fraction.

[0007] As preferred, the cold-temperature hot-mixing suitable asphalt regenerant comprises the following components: 100 parts of waste engine oil, 60 parts of polymeric MDI, and 50 parts of solvent oil, by mass fraction.

[0008] Based on the same inventive concept, the application further provides a preparation method of the cold-temperature hot-mixing suitable asphalt regenerant, for preparing the cold-temperature hot-mixing suitable asphalt regenerant, comprising the following steps:

[0009] After the polymeric MDI is added into the waste engine oil and stirred uniformly, an intermediate product is obtained;

[0010] After the solvent oil is added into the intermediate product and stirred, the cold-temperature hot-mixing suitable asphalt regenerant is obtained.

[0011] As preferred, during the stirring of the polymeric MDI and the waste engine oil, the temperature is controlled at 55-65℃, the rotating speed is controlled at 300-450r / min, and the time is controlled at 5-10min;

[0012] During the stirring of the solvent oil and the intermediate product, the temperature is controlled at 55-65℃, the rotating speed is controlled at 300-450r / min, and the time is controlled at 5-10min.

[0013] Based on the same inventive concept, the application further provides a regenerated asphalt mixture, comprising the following components: by mass fraction,

[0014] During cold mixing, 18-30 parts of the cold-temperature hot-mixing suitable asphalt regenerant, 100 parts of aged asphalt mixture;

[0015] During warm mixing, 8-18 parts of the cold-temperature hot-mixing suitable asphalt regenerant, 100 parts of aged asphalt mixture, and 4-6 parts of fresh asphalt;

[0016] During hot mixing, 3-8 parts of the cold-temperature hot-mixing suitable asphalt regenerant, 100 parts of aged asphalt mixture, and 4-6 parts of fresh asphalt.

[0017] As preferred, the aged asphalt mixture is aged SBS modified asphalt mixture, and the fresh asphalt is fresh SBS modified asphalt.

[0018] As preferred, the experimental preparation process of the aged asphalt mixture is as follows:

[0019] The asphalt, aggregate, and mineral powder are respectively preheated and mixed to obtain fresh asphalt mixture;

[0020] The fresh asphalt mixture is laid and put into a constant-temperature blast drying oven for short-term aging;

[0021] continuously aging the short-term aged asphalt mixture to obtain the aged asphalt mixture;

[0022] The aged asphalt mixture has an AC-13 gradation, the ratio of the weight of the asphalt to the total weight of the aggregate and the mineral powder is 4.8:100, the asphalt is preheated to a molten state, the preheating temperature of the aggregate and the mineral powder is controlled to be 170-180 DEG C, and the preheating time is 3.5-5 h, the mixing temperature of the fresh asphalt mixture is 170-180 DEG C, the short-term aging temperature is controlled to be 125-140 DEG C, and the short-term aging time is controlled to be 3.5-5 h, and the long-term aging temperature is controlled to be 130-145 DEG C, and the long-term aging time is controlled to be 30-50 h.

[0023] Based on the same inventive concept, the application further provides a preparation method of a recycled asphalt mixture, characterized by comprising the following steps for preparing the recycled asphalt mixture:

[0024] The aged asphalt mixture preheated to different mixing temperatures is added into a mixing kettle for mixing;

[0025] In cold mixing, the cold-temperature hot-mixing suitable asphalt recycling agent preheated to a molten state is added into the aged asphalt mixture after mixing to obtain the recycled asphalt mixture;

[0026] In warm mixing or hot mixing, the cold-temperature hot-mixing suitable asphalt recycling agent preheated to a molten state is added into the aged asphalt mixture after mixing to obtain an intermediate product,

[0027] The fresh asphalt preheated to a molten state is added into the intermediate product for continuous mixing to obtain the recycled asphalt mixture.

[0028] Preferably, the mixing temperature of the aged asphalt mixture is controlled to be 30-80 DEG C in cold mixing, 130-150 DEG C in warm mixing, and 170-180 DEG C in hot mixing.

[0029] One or more technical solutions provided in the embodiments of the application have at least the following technical effects or advantages:

[0030] The cold-temperature-thermal mixing suitable asphalt regenerant prepared by the method has excellent diffusion in aged asphalt, and can be used for mixing of the regenerated asphalt mixture at different temperatures such as cold mixing, warm mixing and thermal mixing, so that the emission of toxic gas can be effectively reduced, and the secondary pollution to the environment can be reduced. The polymeric MDI is used for regenerating the aged SBS modified asphalt, the reactive component in the polymeric MDI can repair the molecular structure of the SBS, restore the various performances of the aged SBS modified asphalt, and then the road performance of the regenerated SBS modified asphalt mixture is improved. Therefore, the cold-temperature-thermal mixing suitable asphalt regenerant prepared by the method can meet the high-quality recycling of the aged SBS modified asphalt mixture at different construction mixing temperatures, and the various road performances of the regenerated modified asphalt mixture are restored to a certain extent, and the environmental, social and economic benefits are remarkable. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] The first aspect of the present application provides a preparation method of a cold-temperature-thermal mixing suitable asphalt regenerant, which comprises the following steps:

[0033] (1) adding polymeric MDI into waste engine oil and stirring uniformly;

[0034] (2) adding solvent oil into the product obtained in step (1) and mixing and stirring to obtain a cold-temperature-thermal mixing suitable asphalt regenerant.

[0035] In the method, in the preferred embodiment, the mass ratio of the amounts of polymeric MDI, waste engine oil and solvent oil is 60:100:50.

[0036] In the method, in step (2), the mixing and stirring conditions include that the temperature is 60 DEG C, and the uniform stirring is carried out at a rotation speed of 300-450 r / min for 5 min.

[0037] The second aspect of the present application provides a cold-temperature-thermal mixing suitable asphalt regenerant prepared by the above method.

[0038] The third aspect of the present application provides an experimental preparation method of aged asphalt mixture. The asphalt, aggregate and mineral powder are preheated respectively, then mixed to obtain new asphalt mixture. Then the new asphalt mixture is paved into a tray and placed into a constant temperature air drying oven for short-term aging. Finally, the short-term aged asphalt mixture is further aged for long-term to obtain long-term thermal oxygen aged asphalt mixture. The specific steps are as follows:

[0039] (1) The aggregate and mineral powder are preheated in an oven at 175℃ for 4h, and the asphalt is preheated to a molten state;

[0040] (2) The aggregate is added to a mixing kettle at 180℃ and mixed for 90s, then the molten asphalt is added to the mixing kettle and mixed for another 90s, and then the mineral powder is added and mixed for another 90s to prepare the new asphalt mixture;

[0041] (3) The new asphalt mixture is paved into a tray and placed into a constant temperature air drying oven for short-term thermal oxygen aging at 135℃ for 4h;

[0042] (4) The short-term thermal oxygen aged asphalt mixture is further aged in a constant temperature air drying oven at 140℃ for 36h to obtain long-term thermal oxygen aged asphalt mixture.

[0043] In the preparation method of the aged asphalt mixture of the present application, the natural aggregate and the filler can be the conventional choices in the art.

[0044] The fourth aspect of the present application provides a preparation method of recycled asphalt mixture. The cold temperature thermal mixing suitable type asphalt regenerant, fresh asphalt and long-term thermal oxygen aged asphalt mixture are preheated respectively, and then mixed.

[0045] In the preparation method of the recycled asphalt mixture of the present application, in the preferred embodiment, the weight ratio of the cold temperature thermal mixing suitable type asphalt regenerant to the aged asphalt mixture is (18-30):100 during cold mixing, specifically, for example, 18:100; 20:100; 24:100; 26:100 or 30:100.

[0046] During warm mixing, the weight ratio of the cold temperature thermal mixing suitable type asphalt regenerant to the aged asphalt mixture is (8-18):100, specifically, for example, 8:100; 10:100; 12:100; 15:100 or 18:100; the weight ratio of the fresh asphalt to the aged asphalt mixture is (4-6):100, specifically, for example, 4:100; 5:100; 6:100.

[0047] In the hot mixing, the weight ratio of the cold-temperature hot-mixing suitable asphalt regenerant to the aged asphalt mixture is (3-8):100, and specifically, for example, 3:100; 4:100; 5:100; 6:100 or 7:100; the weight ratio of the fresh asphalt to the aged asphalt mixture is (4-6):100, and specifically, for example, 4:100; 5:100; 6:100.

[0048] In the preparation method of the regenerated asphalt mixture, in the specific operation process, the preheated fresh asphalt, the cold-temperature hot-mixing suitable asphalt regenerant and the aged SBS modified asphalt mixture are mixed, and the specific steps are as follows:

[0049] (1) The preheated aged SBS modified asphalt mixture is mixed at 50℃ (cold mixing), 140℃ (warm mixing) and 175℃ (hot mixing) for 90s, respectively;

[0050] (2) The preheated asphalt regenerant is added to the aged SBS modified asphalt mixture and continues to mix for 90s to obtain the cold-mixed regenerated SBS modified asphalt mixture;

[0051] (3) The molten fresh asphalt is added to the mixture of the asphalt regenerant and the aged asphalt mixture and continues to mix for 90s to obtain the warm-mixed or hot-mixed regenerated SBS modified asphalt mixture.

[0052] The fifth aspect of the present application provides a regenerated asphalt mixture prepared by the above method.

[0053] The following examples further illustrate the cold-temperature hot-mixing suitable asphalt regenerant and the preparation method thereof according to the present application. The examples are implemented on the premise of the technical solutions of the present application, and detailed implementation modes and specific operation processes are given, but the protection scope of the present application is not limited to the following examples.

[0054] In the following examples, the experimental methods are conventional methods in the art unless otherwise specified. The experimental materials used in the following examples are commercially available unless otherwise specified.

[0055] In the examples and comparative examples of the present application, the following raw materials are used: fresh SBS modified asphalt with a softening point of 62.4℃, a 25℃ penetration of 67dmm and a 135℃ Brookfield rotational viscosity of 1.03Pa·s.

[0056] Example 1

[0057] Preparation of the cold-temperature hot-mixing suitable asphalt regenerant: polymeric MDI, waste engine oil and solvent oil are pre-mixed at a ratio of 0.6:1:0.5 at 60℃, and after stirring for 5min, the cold-temperature hot-mixing suitable asphalt regenerant is obtained.

[0058] Application of cold-temperature hot-mixing asphalt regenerant

[0059] (1) Cold-mixing regenerated asphalt mixture

[0060] After the aged SBS modified asphalt mixture is preheated at 50°C, the cold-temperature hot-mixing asphalt regenerant is added in an amount of 18% of the mass of the aged asphalt in the relative aged SBS modified asphalt mixture, and then mixed in a mixing kettle at a temperature of 50°C for 90s, to obtain the cold-mixing regenerated SBS modified asphalt mixture.

[0061] (2) Warm-mixing regenerated asphalt mixture

[0062] After the aged SBS modified asphalt mixture is preheated at 145°C, the cold-temperature hot-mixing asphalt regenerant is added in an amount of 8% of the mass of the aged asphalt in the relative aged SBS modified asphalt mixture, and then mixed in a mixing kettle at a temperature of 145°C for 90s, and then 4.2% of the mass of the aggregate and filler of molten fresh SBS modified asphalt is added to the mixing kettle for further mixing for 60s, to obtain the warm-mixing regenerated SBS modified asphalt mixture.

[0063] (3) Hot-mixing regenerated asphalt mixture

[0064] After the aged SBS modified asphalt mixture is preheated at 175°C, the cold-temperature hot-mixing asphalt regenerant is added in an amount of 3% of the mass of the aged asphalt in the relative aged SBS modified asphalt mixture, and then mixed in a mixing kettle at a temperature of 175°C for 90s, and then 4.2% of the mass of the aggregate and filler of molten fresh SBS modified asphalt is added to the mixing kettle for further mixing for 90s, to obtain the hot-mixing regenerated SBS modified asphalt mixture.

[0065] Example 2

[0066] Compared with the mode of example 1, the difference is that the amount of the cold-temperature hot-mixing asphalt regenerant added is 20% (cold-mixing), 10% (warm-mixing), and 4% (hot-mixing) of the mass of the aged asphalt in the relative aged SBS modified asphalt mixture, respectively.

[0067] Example 3

[0068] Compared with the mode of example 1, the difference is that the amount of the cold-temperature hot-mixing asphalt regenerant added is 24% (cold-mixing), 12% (warm-mixing), and 5% (hot-mixing) of the mass of the aged asphalt in the relative aged SBS modified asphalt mixture, respectively.

[0069] Example 4

[0070] Comparing with the way of embodiment 1, the difference is that the adding amount of cold, warm and hot mixing suitable asphalt regenerant is 26% (cold mixing), 15% (warm mixing) and 6% (hot mixing) of the relative aged SBS modified asphalt mixture.

[0071] Embodiment 5

[0072] Comparing with the way of embodiment 1, the difference is that the adding amount of cold, warm and hot mixing suitable asphalt regenerant is 26% (cold mixing), 15% (warm mixing) and 6% (hot mixing) of the relative aged SBS modified asphalt mixture.

[0073] Comparative example 1

[0074] Comparing with embodiment 1, the difference is that the cold, warm and hot mixing suitable asphalt regenerant of the application is replaced by ordinary asphalt regenerant (waste cooking oil).

[0075] Application of ordinary asphalt regenerant:

[0076] (1) Cold mixing regenerated asphalt mixture

[0077] After the aged SBS modified asphalt mixture is preheated at 50℃, the waste cooking oil of 26% of the relative aged SBS modified asphalt mixture is added, and then mixed in the stirring pot with a temperature of 50℃ for 90s, to prepare the cold mixing regenerated SBS modified asphalt mixture.

[0078] (2) Warm mixing regenerated asphalt mixture

[0079] After the aged SBS modified asphalt mixture is preheated at 145℃, the waste cooking oil of 15% of the relative aged SBS modified asphalt mixture is added, and then mixed in the stirring pot with a temperature of 145℃ for 90s, and then the molten fresh SBS modified asphalt with a mass of 2.2% of the weight of the aggregate and filler is added to the stirring pot for further mixing for 60s, to prepare the warm mixing regenerated SBS modified asphalt mixture.

[0080] (3) Hot mixing regenerated asphalt mixture

[0081] After the aged SBS modified asphalt mixture is preheated at 175℃, the waste cooking oil of 6% of the relative aged SBS modified asphalt mixture is added, and then mixed in the stirring pot with a temperature of 175℃ for 90s, and then the molten fresh SBS modified asphalt with a mass of 2.2% of the weight of the aggregate and filler is added to the stirring pot for further mixing for 90s, to prepare the hot mixing regenerated SBS modified asphalt mixture.

[0082] Test example

[0083] Immersion Marshall residual stability: Marshall specimens of the modified asphalt mixtures of the examples and the comparative examples were prepared according to the test method of Highway Engineering Asphalt and Asphalt Mixture Test Procedures (JTG E20-2011 T 0702) using the compaction method. The Marshall stability of the above asphalt mixture specimens was tested according to the test method of Highway Engineering Asphalt and Asphalt Mixture Test Procedures (JTG E20-2011 T 0709) using a Marshall stability tester. The immersion Marshall test is different from the above test in that the specimen needs to be kept in a 60°C constant temperature water tank for 48h. Further, the percentage of the Marshall stability after immersion to the Marshall stability before immersion is taken as the immersion Marshall residual stability, by which the water stability of the above asphalt mixture is evaluated, and the greater the value, the better the water stability;

[0084] Freeze-thaw splitting test: Marshall specimens of the modified asphalt mixtures of the examples and the comparative examples were prepared according to the test method of Highway Engineering Asphalt and Asphalt Mixture Test Procedures (JTG E20-2011 T 0702) using the compaction method. The splitting strength of the above asphalt mixture specimens after freeze-thaw cycles was tested according to the test method of Highway Engineering Asphalt and Asphalt Mixture Test Procedures (JTG E20-2011 T 0729) using a Marshall stability tester. Further, the percentage of the splitting strength after freeze-thaw to the splitting strength before freeze-thaw is taken as the freeze-thaw splitting strength ratio, by which the water stability of the above asphalt mixture is evaluated, and the greater the value, the better the water stability.

[0085] Dynamic stability: The rutting specimens of the asphalt mixtures prepared in the examples and the comparative examples were tested for high-temperature stability under the test conditions of a temperature of 60°C and a wheel pressure of 0.7 MPa according to the test method of Highway Engineering Asphalt and Asphalt Mixture Test Procedures (JTG E20-2011 T 0719), and the dynamic stability was used as the main index to evaluate the high-temperature deformation resistance of the specimens;

[0086] Maximum bending tensile strain: The specimens of the asphalt mixtures prepared in the examples and the comparative examples were tested under the low-temperature condition of -10°C according to the test method of Highway Engineering Asphalt and Asphalt Mixture Test Procedures (JTG E20-2011 T 0715) using a loading speed of 50 mm / min, and the maximum bending tensile strain at the failure of the specimen was used to evaluate the low-temperature performance of the specimen.

[0087] The immersion Marshall residual stability, freeze-thaw splitting strength ratio, dynamic stability and maximum bending tensile strain of the asphalt mixtures prepared from Comparative Example 1 and Examples 1-5 were determined, and the results are listed in Table 1 together with the standard requirements for the road performance of modified asphalt mixtures in the art.

[0088] Table 1

[0089]

[0090]

[0091] Note: According to JTG F40-2004, in the technical requirements, except for the maximum bending tensile strain index of -10℃, other indexes take the maximum limit value

[0092] According to the data in Table 1, it can be seen that the cold-temperature-heat mixed asphalt regeneration agent prepared by polymerizing MDI, waste engine oil and solvent oil can be used to prepare regenerated SBS modified asphalt mixture. The two indexes of water stability, immersion Marshall residual stability and freeze-thaw splitting strength ratio, show a trend of first increasing and then slightly decreasing or stabilizing. Except that the part of cold mixed asphalt mixture can only meet the technical standard of ordinary asphalt mixture, the other results of cold mixed asphalt mixture can exceed the technical standard of modified asphalt mixture, close to or even slightly higher than the level of new mixed SBS modified asphalt mixture, which proves that the cold-temperature-heat mixed asphalt regeneration agent can regenerate the asphalt matrix of aged SBS modified asphalt, and in addition to the excellent compatibility and diffusion performance of the regeneration agent itself, the polymer MDI component in the regeneration agent can repair the molecular structure of SBS, thereby excellently restoring the road performance of aged SBS modified asphalt mixture. From the data indexes, the water resistance of the preferred cold-temperature-heat mixed regenerated SBS modified asphalt mixture is greatly improved, which can meet the specification requirements of modified asphalt mixture (immersion Marshall residual stability ≥ 85% and freeze-thaw splitting strength ratio ≥ 80%).

[0093] In addition, in terms of high temperature stability, under the action of asphalt regeneration agent, the cold-temperature-heat mixed regenerated SBS modified asphalt mixture at different regeneration agent contents can all meet the maximum limit value DS ≥ 2800 times / mm of the technical requirements of hot mixed modified asphalt mixture, and with the increase of mixing temperature (from cold mixing to warm mixing, and then to hot mixing), the dynamic stability of the regenerated SBS modified asphalt mixture is higher and higher; in terms of low temperature crack resistance, with the continuous increase of the regeneration agent content, the maximum bending tensile strain (με) of the regenerated asphalt mixture gradually increases, indicating that the cold-temperature-heat mixed asphalt regeneration agent can improve the low temperature crack resistance of aged SBS modified asphalt mixture, and the -10℃ maximum bending tensile strain of cold mixed regenerated SBS asphalt mixture can reach 2500με of the technical requirements of modified asphalt mixture, and the maximum bending tensile strain of other regenerated SBS modified asphalt mixture can at least meet 2000με of the technical requirements of ordinary asphalt mixture. Overall, the cold-temperature-heat mixed asphalt regeneration agent prepared by the application has significant regeneration effect on aged SBS modified asphalt mixture at different mixing temperatures, and the comprehensive road performance is greatly improved, and it can adapt to different application requirements.

[0094] In summary, the cold warm hot mixed suitable asphalt regenerant prepared by the application is used to regenerate aged SBS modified asphalt mixture, can regenerate aged SBS modified asphalt mixture at different construction temperatures, and the various road performances of the regenerated SBS modified asphalt mixture are recovered to a certain extent, and has significant environmental, social and economic benefits.

[0095] The above specific embodiments further specifically describe the purposes, technical solutions and beneficial effects of the application, and it should be understood that the above description is only a specific embodiment of the application and is not used to limit the application, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A cold warm hot mix asphalt compatible rejuvenator characterized by, It comprises the following components: 100 parts of waste engine oil, 50-78 parts of polymeric MDI, and 20-55 parts of solvent oil.

2. A method for preparing a cold warm hot mix asphalt compatible rejuvenator, characterized by, The preparation method of the cold-temperature hot-mixing suitable asphalt regenerant of claim 1 comprises the following steps: After the polymeric MDI is added to the waste engine oil and stirred uniformly, an intermediate product is obtained. After the solvent oil is added to the intermediate product and stirred, the cold-temperature hot-mixing suitable asphalt regenerant is obtained.

3. The preparation method of the cold-temperature hot-mixing suitable asphalt regenerant of claim 2, wherein During the stirring of the polymeric MDI and the waste engine oil, the temperature is controlled at 55-65℃, the rotating speed is controlled at 300-450 r / min, and the time is controlled at 5-10 min. During the stirring of the solvent oil and the intermediate product, the temperature is controlled at 55-65℃, the rotating speed is controlled at 300-450 r / min, and the time is controlled at 5-10 min.

4. A recycled asphalt mixture characterized in that, It comprises the following components: 100 parts of waste engine oil, 50-78 parts of polymeric MDI, and 20-55 parts of solvent oil. For cold mixing, 18-30 parts of the cold-temperature hot-mixing suitable asphalt regenerant of claim 1, 100 parts of aged asphalt mixture, and 4-6 parts of fresh asphalt are used. For warm mixing, 8-18 parts of the cold-temperature hot-mixing suitable asphalt regenerant of claim 1, 100 parts of aged asphalt mixture, and 4-6 parts of fresh asphalt are used. For hot mixing, 3-8 parts of the cold-temperature hot-mixing suitable asphalt regenerant of claim 1, 100 parts of aged asphalt mixture, and 4-6 parts of fresh asphalt are used.

5. The recycled asphalt mixture of claim 4, wherein, The aged asphalt mixture is aged SBS modified asphalt mixture, and the fresh asphalt is fresh SBS modified asphalt.

6. A method of producing a recycled asphalt mixture, characterized by, The preparation method of the regenerated asphalt mixture of claim 4 or 5 comprises the following steps: The aged asphalt mixture preheated to different mixing temperatures is added to a mixing pot for mixing. For cold mixing, the cold-temperature hot-mixing suitable asphalt regenerant preheated to a molten state is added to the aged asphalt mixture after mixing, to obtain the regenerated asphalt mixture. For warm or hot mixing, the cold-temperature hot-mixing suitable asphalt regenerant preheated to a molten state is added to the aged asphalt mixture after mixing, to obtain an intermediate product, The fresh asphalt preheated to a molten state is added to the intermediate product for further mixing, to obtain the regenerated asphalt mixture.

7. The method of claim 6, wherein the reclaimed asphalt mixture is prepared by, The mixing temperature of the aged asphalt mixture is controlled at 30-80℃ for cold mixing, 130-150℃ for warm mixing, and 170-180℃ for hot mixing.

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