A composite high-RAP content high-efficiency asphalt rejuvenator and its preparation method

Abstract

The present invention belongs to the technical field of asphalt rejuvenators, and particularly relates to a composite high-RAP content high-efficiency asphalt rejuvenator and a preparation method thereof. The composite high-RAP content high-efficiency asphalt rejuvenator provided by the present invention comprises the following components and their parts by weight: 70-90 parts of a composite base oil, 12-26 parts of a plasticizer, 2-6 parts of a low-temperature stabilizer, and 0.5-3 parts of a penetrant. The asphalt rejuvenator provided by the present invention can cause the conversion between the components of the aged asphalt, promote the overall recovery of the performance of the aged asphalt, effectively improve the penetration and low-temperature ductility of the prepared recycled asphalt, and can effectively improve the anti-aging ability of the prepared recycled asphalt, adjust the viscosity of the recycled asphalt, and increase its fluidity, low-temperature crack resistance and storage stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of asphalt rejuvenators, and particularly relates to a composite high-RAP content high-efficiency asphalt rejuvenator and a preparation method thereof. Background Art

[0002] Recycled asphalt pavement materials are subjected to the effects of natural environments such as sunlight, precipitation, and high temperatures, and are also subjected to the repeated action of vehicle loads, resulting in the aging of asphalt. With the continuous and rapid development of China's national economy, after experiencing large-scale road construction, a large amount of recycled asphalt pavement materials have been generated during the renovation process. The recycling and utilization of asphalt mixture recycled materials (RAP) can effectively dispose of waste materials, reduce the extraction amount of new materials, and save a large amount of asphalt and sand and gravel materials, thereby achieving the effects of saving costs, conserving resources, and protecting the ecological environment.

[0003] However, limited by the progress of material development and the limitations of construction technology, the utilization rate of old asphalt pavement materials in China is still relatively low at present, with an average proportion of about 30%. As the amount of waste materials used increases, the low-temperature performance of recycled asphalt mixtures gradually decreases and cannot meet the usage requirements. This is closely related to the performance of recycled asphalt mixtures. Often, the large incorporation of RAP will have a negative impact on the performance of recycled asphalt mixtures. And the quality of rejuvenators is an important factor determining the performance of recycled asphalt mixtures. Therefore, for the efficient recycling of RAP, the development of new asphalt rejuvenators is an inevitable trend in the future development of the road engineering field.

[0004] However, although there are many types of existing asphalt rejuvenators, most of them are composed of low-viscosity light oils, or anti-aging agents and other blending components are added on this basis. Such rejuvenators have poor rejuvenation effects, and the low-temperature ductility of the prepared recycled asphalt mixtures is poor. Moreover, during the production, storage, transportation, construction, and use processes, due to being in a high-temperature environment for a long time, they are often affected by heat, oxygen, etc., resulting in poor performance and aging, which affects their usage performance.

[0005] Therefore, there is an urgent need to develop a high-efficiency asphalt rejuvenator for high-RAP content, which can effectively improve the rejuvenation performance when applied to aged asphalt and can effectively improve its storage stability. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a composite high-RAP content high-efficiency asphalt rejuvenator and a preparation method thereof. The composite high-RAP content high-efficiency asphalt rejuvenator provided by the present invention can cause the conversion between aged asphalt components, promote the overall recovery of the performance of aged asphalt, effectively improve the penetration and low-temperature ductility of the prepared recycled asphalt, and can effectively improve the anti-aging ability of the prepared recycled asphalt, adjust the viscosity of the recycled asphalt, and increase its fluidity, low-temperature crack resistance, and storage stability.

[0007] The technical solution of the present invention is as follows:

[0008] A composite high-RAP content high-efficiency asphalt rejuvenator, comprising the following components and their parts by weight:

[0009] 70 - 90 parts of composite base oil, 12 - 26 parts of plasticizer, 2 - 6 parts of low-temperature stabilizer, 0.5 - 3 parts of penetrant.

[0010] Furthermore, the composite high-RAP content high-efficiency asphalt rejuvenator consists of the following components and their parts by weight:

[0011] 81 parts of composite base oil, 19 parts of plasticizer, 4 parts of low-temperature stabilizer, 1 part of penetrant.

[0012] The composite base oil is a combination of furfural extract oil and vegetable oil.

[0013] Furthermore, the vegetable oil is one of castor oil, linseed oil and tung oil.

[0014] Furthermore, the weight ratio of the furfural extract oil to the vegetable oil is 6 - 10:2.

[0015] The composite base oil added in the present invention contains a large amount of light components such as aromatics, which can effectively supplement the missing light components in the aged asphalt and has an excellent rejuvenation effect on the aged asphalt.

[0016] Furthermore, the plasticizer is composed of epoxidized soybean oil and dioctyl maleate in a weight ratio of 7 - 11:8 - 12.

[0017] Furthermore, the plasticizer is composed of epoxidized soybean oil and dioctyl maleate in a weight ratio of 9:10.

[0018] The plasticizer added in the present invention is environmentally friendly and non-toxic, can effectively soften the aged asphalt, and at the same time can increase the elastic recovery ability of the aged asphalt, improve the ductility and low-temperature performance of the regenerated asphalt, and effectively improve the penetration of the regenerated asphalt.

[0019] Furthermore, the low-temperature stabilizer is composed of styrene-butadiene rubber, 2,6-di-tert-butyl-4-methylphenol and wood cellulose in a weight ratio of 6 - 9:1 - 3:2 - 3.

[0020] Furthermore, the low-temperature stabilizer is composed of styrene-butadiene rubber, 2,6-di-tert-butyl-4-methylphenol and wood cellulose in a weight ratio of 7:2:3.

[0021] The present invention adds a low-temperature stabilizer composed of the above components, which can effectively improve the durability of the prepared recycled asphalt, prevent the aging of the recycled asphalt, and effectively increase the low-temperature ductility of the recycled asphalt. At the same time, verified by the tests of the present invention, after adding the low-temperature stabilizer provided by the present invention, the storage stability of the prepared asphalt rejuvenator can also be effectively improved, and the influence caused by temperature, light, etc. in the environment during long-term transportation and storage of the asphalt rejuvenator can be effectively reduced, so that it can maintain excellent rejuvenation performance.

[0022] Further, the penetrant is composed of isooctyl polyoxyethylene ether and sodium lignosulfonate in a weight ratio of 5-9:2.

[0023] The present invention adds a penetrant composed of the above components and proportions, which can effectively disperse the asphaltene macromolecules, facilitate the composite base oil in the asphalt rejuvenator of the present invention to enter the aged asphalt. At the same time, the added penetrant can also interact with the composite base oil, further enhancing the fusion speed of the asphalt rejuvenator of the present invention and the aged asphalt, strengthening the movement ability between asphaltenes, facilitating the rapid diffusion of the asphalt rejuvenator in the aged asphalt, and effectively increasing the low-temperature ductility of the prepared recycled asphalt.

[0024] In addition, the present invention also provides a preparation method of a composite high-RAP content high-efficiency asphalt rejuvenator, which includes the following steps:

[0025] S1. Add the plasticizer into a mixer, heat it up to 50-65°C, and stir evenly to obtain a mixed material I;

[0026] S2. After adding the composite base oil to the mixed material I obtained in step S1, heat it up to 90-110°C, and stir evenly to obtain a mixed material II;

[0027] S3. Heat the mixed material II obtained in step S2 to 120-140°C, and then sequentially add the low-temperature stabilizer and the penetrant for high-speed shearing to obtain the product.

[0028] Further, the stirring speed in step S1 is 200-300 rpm, and the stirring time is 10-25 min.

[0029] Further, the stirring speed in step S2 is 300-500 rpm, and the stirring time is 5-15 min.

[0030] Further, the high-speed shearing speed in step S3 is 2300-2600 rpm, and the high-speed shearing time is 5-15 min.

[0031] Further, the dosage of the composite high-RAP content high-efficiency asphalt rejuvenator in preparing asphalt recycled materials is 5-10%.

[0032] Compared with the prior art, the composite high-RAP content high-efficiency asphalt rejuvenator provided by the present invention has the following advantages:

[0033] (1) The composite high-RAP content high-efficiency asphalt rejuvenator provided by the present invention can effectively cause the conversion between the components of the aged asphalt through the reasonable proportioning and synergistic action of components such as the added composite base oil, plasticizer, low-temperature stabilizer, penetrant, etc., promote the overall recovery of the performance of the aged asphalt, and effectively improve the penetration and low-temperature ductility of the prepared recycled asphalt.

[0034] (2) The composite high-RAP content high-efficiency asphalt rejuvenator provided by the present invention can effectively restore the recycling performance of the aged asphalt, improve the anti-aging ability of the prepared recycled asphalt, adjust the viscosity of the recycled asphalt, greatly improve the low-temperature ductility of the recycled asphalt, and increase its fluidity and low-temperature crack resistance.

[0035] (3) The composite high-RAP content high-efficiency asphalt rejuvenator provided by the present invention can effectively reduce the influence of environmental problems such as high temperature and oxidation that may exist during the production, transportation and storage of the rejuvenator, significantly reduce the performance degradation caused by environmental problems, and improve its storage stability. Specific Embodiments

[0036] The present invention will be further described below through the description of specific embodiments. However, this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements according to the basic idea of the present invention. As long as they do not depart from the basic idea of the present invention, they are all within the protection scope of the present invention.

[0037] In the following examples and comparative examples, the reagents not specifically described are conventional reagents and can be purchased from conventional reagent production and sales companies. The methods used, unless otherwise specified, are all prior arts. Some raw material information and manufacturers are as follows:

[0038] Castor oil, CAS No.: 8001-79-4, product number: S24344; Linseed oil, CAS No.: 8001-26-1, product number: S25937, Epoxidized soybean oil, CAS No.: 8013-07-8, product number: S50881; all are purchased from Shanghai Yuanye Bio-Technology Co., Ltd.;

[0039] Tung oil, CAS No.: 8001-20-5, purchased from Jinan Century Tongda Chemical Co., Ltd.;

[0040] Styrene-butadiene rubber, CAS No.: 9003-55-8, product number: 1502, purchased from Shandong Qiaolong Chemical Technology Co., Ltd.;

[0041] Wood cellulose, CAS No.: 99331-82-5;

[0042] Isooctyl alcohol polyoxyethylene ether, CAS No.: 26468-86-0;

[0043] Dimethyl phthalate, CAS No.: 131-11-3;

[0044] Fatty alcohol polyoxyethylene ether, CAS No.: 68131-39-5.

[0045] Example 1 A composite high-RAP content high-efficiency asphalt rejuvenator and its preparation method

[0046] A composite high-RAP content high-efficiency asphalt rejuvenator is composed of the following components and their weight parts:

[0047] 70 parts of composite base oil, 12 parts of plasticizer, 2 parts of low-temperature stabilizer, 0.5 part of penetrant.

[0048] The weight ratio of the furfural extract oil to the castor oil is 6:2.

[0049] The plasticizer is composed of epoxidized soybean oil and dioctyl maleate in a weight ratio of 7:12.

[0050] The low-temperature stabilizer is composed of styrene-butadiene rubber, 2,6-di-tert-butyl-4-methylphenol and lignocellulose in a weight ratio of 6:3:3.

[0051] The penetrant is composed of isooctyl alcohol polyoxyethylene ether and sodium lignosulfonate in a weight ratio of 5:2.

[0052] The preparation method of the composite high-RAP content high-efficiency asphalt rejuvenator includes the following steps:

[0053] S1. Add the plasticizer into a blender, heat up to 50 °C, and stir at a stirring speed of 300 rpm for 25 min to obtain a mixed material I;

[0054] S2. After adding the composite base oil to the mixed material I obtained in step S1, heat up to 90 °C, and stir at a stirring speed of 500 rpm for 15 min to obtain a mixed material II;

[0055] S3. Heat up the mixed material II obtained in step S2 to 120 °C, and then successively add the low-temperature stabilizer and the penetrant for high-speed shearing. The high-speed shearing speed is 2300 rpm and the time is 15 min to obtain the product.

[0056] Example 2 A composite high-RAP content high-efficiency asphalt rejuvenator and its preparation method

[0057] A composite high-RAP content high-efficiency asphalt rejuvenator is composed of the following components and their weight parts:

[0058] 81 parts of compound base oil, 19 parts of plasticizer, 3 parts of low-temperature stabilizer, 1 part of penetrant.

[0059] The weight ratio of the furfural extract oil to the linseed oil is 8:2.

[0060] The plasticizer is composed of epoxidized soybean oil and dioctyl maleate in a weight ratio of 9:10.

[0061] The low-temperature stabilizer is composed of styrene-butadiene rubber, 2,6-di-tert-butyl-4-methylphenol and lignocellulose in a weight ratio of 7:2:3.

[0062] The penetrant is composed of isooctyl polyoxyethylene ether and sodium lignosulfonate in a weight ratio of 7:2.

[0063] The preparation method of the composite high-RAP content high-efficiency asphalt rejuvenator includes the following steps:

[0064] S1. Add the plasticizer into a blender, heat up to 60°C, and stir at a stirring speed of 250 rpm for 20 min to obtain a mixed material I;

[0065] S2. After adding the compound base oil to the mixed material I obtained in step S1, heat up to 100°C, and stir at a stirring speed of 400 rpm for 10 min to obtain a mixed material II;

[0066] S3. Heat up the mixed material II obtained in step S2 to 130°C, and then sequentially add the low-temperature stabilizer and the penetrant for high-speed shearing. The high-speed shearing speed is 2500 rpm and the time is 10 min to obtain the product.

[0067] Example 3 A composite high-RAP content high-efficiency asphalt rejuvenator and its preparation method

[0068] A composite high-RAP content high-efficiency asphalt rejuvenator is composed of the following components and their weight parts:

[0069] 90 parts of compound base oil, 26 parts of plasticizer, 6 parts of low-temperature stabilizer, 3 parts of penetrant.

[0070] The weight ratio of the furfural extract oil to the tung oil is 10:2.

[0071] The plasticizer is composed of epoxidized soybean oil and dioctyl maleate in a weight ratio of 11:8.

[0072] The low-temperature stabilizer is composed of styrene-butadiene rubber, 2,6-di-tert-butyl-4-methylphenol and lignocellulose in a weight ratio of 9:1:2.

[0073] The penetrant is composed of isooctyl polyoxyethylene ether and sodium lignosulfonate in a weight ratio of 9:2.

[0074] The preparation method of the described composite high-RAP content high-efficiency asphalt rejuvenator includes the following steps:

[0075] S1. Add the plasticizer into a blender, heat it up to 65°C, and stir at a stirring speed of 200 rpm for 10 min to obtain mixed material I;

[0076] S2. After adding the composite base oil to the mixed material I obtained in step S1, heat it up to 110°C, and stir at a stirring speed of 300 rpm for 5 min to obtain mixed material II;

[0077] S3. Heat up the mixed material II obtained in step S2 to 140°C, then successively add the low-temperature stabilizer and the penetrant for high-speed shearing. The speed of high-speed shearing is 2600 rpm and the time is 5 min, thus obtaining the product.

[0078] Comparative Example 1 An asphalt rejuvenator and its preparation method

[0079] Compared with Example 2, the difference in Comparative Example 1 is that dioctyl maleate in the plasticizer is replaced by dimethyl phthalate, that is, the plasticizer is composed of epoxy soybean oil and dimethyl phthalate in a weight ratio of 9:10, and other components and preparation methods are the same as those in Example 2.

[0080] Comparative Example 2 An asphalt rejuvenator and its preparation method

[0081] Compared with Example 2, the difference in Comparative Example 2 is that the penetrant is only isooctyl polyoxyethylene ether and sodium lignosulfonate is not added, and other components and preparation methods are the same as those in Example 2.

[0082] Comparative Example 3 An asphalt rejuvenator and its preparation method

[0083] Compared with Example 2, the difference in Comparative Example 3 is that isooctyl polyoxyethylene ether in the penetrant is replaced by fatty alcohol polyoxyethylene ether, that is, the penetrant is composed of fatty alcohol polyoxyethylene ether and sodium lignosulfonate in a weight ratio of 7:2, and other components and preparation methods are the same as those in Example 2.

[0084] Comparative Example 4 An asphalt rejuvenator and its preparation method

[0085] Compared with Example 2, the difference in Comparative Example 4 is that wood cellulose is not added in the low-temperature stabilizer, and the addition amounts of styrene-butadiene rubber and 2,6-di-tert-butyl-4-methylphenol are correspondingly increased, that is, the low-temperature stabilizer is composed of styrene-butadiene rubber and 2,6-di-tert-butyl-4-methylphenol in a weight ratio of 9:3, and other components and preparation methods are the same as those in Example 2.

[0086] Test Example 1 Aging asphalt regeneration recovery test

[0087] The specific test methods are as follows:

[0088] (1) Use an indoor asphalt automatic extractor to extract the aged asphalt from the recycled pavement asphalt materials, and detect the three major indicators of the aged asphalt, namely penetration, softening point and ductility;

[0089] (2) Preparation and detection of recycled asphalt mixture:

[0090] Add 20g of the asphalt rejuvenators prepared in Examples 1-3, Comparative Examples 1-4 and a commercially available asphalt rejuvenator (purchased from Changzhou Zhuozhuo New Materials Technology Co., Ltd., XT-2) to 200g of recycled pavement asphalt materials (the asphalt-aggregate ratio of the recycled pavement asphalt materials is 5%), and then heat them to 130°C and stir for 5 minutes respectively to obtain recycled asphalt mixtures, and detect the three major indicators of the recycled asphalt mixtures. The test results are shown in Table 1.

[0091] (3) Preparation and detection of recycled asphalt concrete:

[0092] Prepare fully recycled dense-graded AC-13 asphalt concrete: Weigh 100 parts of recycled pavement asphalt materials according to the ratio and put them into an oven at 150°C for 4h, then add 70# asphalt accounting for 0.77% of the weight of the recycled pavement asphalt materials and the asphalt rejuvenators of Examples 1-3, Comparative Examples 1-4 and the commercially available asphalt rejuvenator accounting for 0.423% of the weight of the recycled pavement asphalt materials, heat to 160°C and keep warm, stir for 180s, and then conduct Marshall test with double-sided compaction for 75 times, with the height controlled at 63.5±1.3mm to obtain recycled asphalt concrete.

[0093] After drying the above-prepared recycled asphalt concrete in an oven at 150°C, use an automatic extractor for extraction to obtain the extracted asphalt, and detect the three major indicators of the extracted asphalt, namely penetration, softening point and ductility. The test results are shown in Table 2.

[0094] Table 1 Test results of the indicators of recycled asphalt mixtures

[0095]

[0096]

[0097] Table 2 Test results of the indicators of the extracted asphalt of recycled asphalt concrete

[0098]

[0099] As can be seen from Table 1, after adding the composite high-efficiency asphalt rejuvenator prepared in Examples 1 to 3 of the present invention, the performance of the aged asphalt is well restored, and the penetration, softening point and ductility indexes of the asphalt in the recycled asphalt mixture all well meet the technical specification requirements in the "Technical Specification for Highway Asphalt Pavement Construction" JTG F40-2004, and the three major indexes of the asphalt in the prepared recycled asphalt mixture are relatively close to those of 70# asphalt.

[0100] As can be seen from Table 2, the present invention also inspected the extracted asphalt of the recycled asphalt concrete prepared by using Examples 1 to 3, Comparative Examples 1 to 4 of the present invention and commercially available asphalt rejuvenators, and the obtained test results are close to those in the asphalt mixture.

[0101] It shows that adding the asphalt rejuvenator prepared by the present invention has an obvious recovery effect on the aged asphalt, and the penetration, softening point and low-temperature ductility of the prepared recycled asphalt are significantly improved, and the low-temperature performance is excellent.

[0102] Test Example 2: Detection of the application performance of recycled asphalt mixture

[0103] Perform performance tests on the recycled asphalt mixture prepared in Test Example 1. Test the Marshall stability, residual stability, low-temperature bending test, dynamic stability, and freeze-thaw splitting strength ratio respectively according to the methods in the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011. The test methods and test results are shown in Table 3.

[0104] Table 3 Detection results of the application performance of recycled asphalt mixture

[0105]

[0106]

[0107] As can be seen from Table 3, the performance indexes of the recycled asphalt mixture prepared by using the composite high-dose high-efficiency asphalt rejuvenator of Examples 1 to 3 of the present invention all well meet the technical specification requirements, and the effect is excellent, indicating that adding the asphalt rejuvenator prepared by the present invention has an obvious recovery effect on the aged asphalt.

[0108] Test Example 3: Storage stability test of asphalt rejuvenator

[0109] Perform performance tests on the asphalt rejuvenators prepared in Example 2 and Comparative Examples 1 to 4 of the present invention respectively according to the test methods in Table 4. Then, place the asphalt rejuvenators prepared in Example 2 and Comparative Examples 1 to 4 under the condition of 40±2°C for 7 days and then conduct performance detection. The obtained test results are shown in Table 4, where the detection methods and quality requirements refer to the "National Standard for the Petroleum and Chemical Industry of the People's Republic of China NB SH T 0819-2010 Hot Mix Asphalt Rejuvenator".

[0110] Table 4 Performance test results of asphalt rejuvenator

[0111]

[0112]

[0113] As can be seen from Table 4, the various indicators of the composite high-RAP content high-efficiency asphalt rejuvenator prepared in Examples 1 to 3 of the present invention meet the national standards, and after being stored at 40±2°C for 7 days, the changes in its various indicators are not significant, indicating that the composite high-RAP content high-efficiency asphalt rejuvenator provided by the present invention has excellent storage stability and can effectively avoid the performance degradation of the asphalt rejuvenator caused by environmental factors during transportation and storage.

[0114] The above embodiments merely illustrate the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A composite high-RAP content high-efficiency asphalt rejuvenator, characterized in that, It includes the following components and their parts by weight: 70 - 90 parts of compound base oil, 12 - 26 parts of plasticizer, 2 - 6 parts of low - temperature stabilizer, 0.5 - 3 parts of penetrant; The plasticizer is composed of epoxidized soybean oil and dioctyl maleate in a weight ratio of 7 - 11:8 - 12; The low - temperature stabilizer is composed of styrene - butadiene rubber, 2,6 - di - tert - butyl - 4 - methylphenol and lignocellulose in a weight ratio of 6 - 9:1 - 3:2 - 3; The penetrant is composed of isooctyl polyoxyethylene ether and sodium lignosulfonate in a weight ratio of 5 - 9:2; The compound base oil is a combination of furfural - extracted oil and vegetable oil; the weight ratio of the furfural - extracted oil to the vegetable oil is 6 - 10:

2.

2. The composite high-RAP content high-efficiency asphalt rejuvenator according to claim 1, characterized in that, It is composed of the following components and their parts by weight: 81 parts of compound base oil, 19 parts of plasticizer, 4 parts of low - temperature stabilizer, 1 part of penetrant.

3. The composite high-RAP content high-efficiency asphalt rejuvenator according to claim 1, wherein The vegetable oil is one of castor oil, linseed oil and tung oil.

4. The composite high-RAP content high-efficiency asphalt rejuvenator according to claim 1, characterized in that, The low - temperature stabilizer is composed of styrene - butadiene rubber, 2,6 - di - tert - butyl - 4 - methylphenol and lignocellulose in a weight ratio of 7:2:

3.

5. A preparation method of the composite high-RAP content high-efficiency asphalt rejuvenator according to any one of claims 1 to 4, characterized in that, It includes the following steps: S1. Add the plasticizer into a blender, heat up to 50 - 65 °C, and stir evenly to obtain mixed material I; S2. After adding the compound base oil to the mixed material I obtained in step S1, heat up to 90 - 110 °C and stir evenly to obtain mixed material II; S3. Heat up the mixed material II obtained in step S2 to 120 - 140 °C, and then successively add the low - temperature stabilizer and the penetrant for high - speed shearing to obtain the product.

6. The preparation method of the composite high-RAP content high-efficiency asphalt rejuvenator according to claim 5, characterized in that, The stirring speed in step S1 is 200 - 300 rpm, and the stirring time is 10 - 25 min; the stirring speed in step S2 is 300 - 500 rpm, and the stirring time is 5 - 15 min; the high - speed shearing speed in step S3 is 2300 - 2600 rpm, and the high - speed shearing time is 5 - 15 min.

7. A method for using the composite high-RAP content high-efficiency asphalt rejuvenator according to any one of claims 1 to 4, characterized in that, The dosage of the composite high - RAP content high - efficiency asphalt rejuvenator in preparing asphalt recycled material is 5 - 10%.

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