Environment-friendly recycled asphalt mixture and preparation method thereof

Abstract

The invention relates to the technical field of waste asphalt regeneration, and discloses an environment-friendly recycled asphalt mixture and a preparation method thereof.The recycled asphalt mixture is prepared from, by weight, 30-50 parts of recycled aggregate, 40-60 parts of new aggregate, 3-7 parts of regenerant, 3-6 parts of matrix asphalt and 1-5 parts of waste oil, and the regenerant is prepared from 65-85% of oil component and 1-5% of stabilizer component; 2-6% of a plasticizer component and 15-35% of waste plastic powder. According to the environment-friendly recycled asphalt mixture and the preparation method thereof, a hot mix plant recycling technology is applied, and the waste asphalt mixture is circularly applied, so that the problem of environmental pollution of the waste asphalt mixture is solved, stone resources and land resources are saved, meanwhile, investment is saved, the construction cost is reduced, energy conservation and emission reduction are facilitated, and the environment-friendly recycled asphalt mixture is suitable for industrial production. And the method has obvious social benefits.

Description

Technical Field

[0001] The invention relates to the technical field of waste asphalt regeneration, and in particular to an environmentally friendly regenerated asphalt mixture and a preparation method thereof. Background Art

[0002] Asphalt pavement will gradually decay and age due to the combined effects of the meteorological environment and traffic loads during use, and various diseases will occur, which will lead to the problem of maintenance and repair and the generation of a large amount of waste asphalt mixture. In order to solve the above problems, asphalt pavement thermal regeneration technology has emerged.

[0003] Factory thermal regeneration is a practical, flexible, simple and quality-guaranteed asphalt pavement regeneration technology. It is a process of re-paving the road surface by milling the old asphalt concrete pavement materials and transporting them back to the factory, crushing and screening them, and mixing them with a certain amount of new aggregate, asphalt and regeneration agent according to the asphalt content, asphalt aging degree, crushed stone gradation and other indicators in the old materials so that the mixture meets the various indicators required by the specifications. This method does not require expensive regeneration machinery and equipment, and can resurface the aged road surface like a new road construction, and can be applied to various types of roads.

[0004] Compared with the traditional asphalt pavement maintenance method, factory thermal regeneration can save a lot of raw materials such as asphalt, sand and gravel, save engineering investment, and is conducive to waste treatment and environmental protection, thus having significant economic and environmental benefits. Therefore, the present invention provides an environmentally friendly regenerated asphalt mixture and a preparation method thereof, which can make the mixture have good performance by adding an environmentally friendly regeneration agent to the mixture, while saving investment and reducing engineering costs, which is conducive to energy conservation and emission reduction, and has significant social benefits. Summary of the invention

[0005] The purpose of the present invention is to provide an environmentally friendly recycled asphalt mixture and a preparation method thereof, and to apply the factory-mixed hot regeneration technology to recycle the waste asphalt mixture, which not only solves the environmental pollution problem of the waste asphalt mixture, but also saves stone resources and land resources, while saving investment, reducing project costs, being conducive to energy conservation and emission reduction, and having significant social benefits.

[0006] To achieve the above-mentioned purpose, the present invention provides an environmentally friendly regenerated asphalt mixture, comprising the following components in parts by weight: 30-50 parts of recycled aggregate, 40-60 parts of new aggregate, 3-7 parts of regeneration agent, 3-6 parts of base asphalt, and 1-5 parts of waste oil, wherein the regeneration agent comprises 65-85% of oil component, 1-5% of stabilizer component, 2-6% of plasticizer component, and 15-35% of waste plastic powder.

[0007] Furthermore, the particle size of the coarse aggregate in the recycled aggregate is 10-25 mm, the particle size of the fine aggregate is 0-10 mm, and the mass ratio of the coarse aggregate to the fine aggregate is 1:1-1.5; the particle sizes of the new aggregate are 0-5 mm, 5-10 mm and 10-20 mm, and the usage ratio is 0-5 mm: 5-10 mm: 10-20 mm = 22:35:43.

[0008] Furthermore, the oil component is one or more of rubber oil, coconut oil or vegetable asphalt.

[0009] Furthermore, the stabilizer component is one or more of polyamide, phenolic resin, epoxy resin, quartz sand or limestone.

[0010] Furthermore, the plasticizer component is one or more of ethylene terephthalate, polybutylene terephthalate, dioctyl phthalate, citrate, and vinyl acetate.

[0011] Furthermore, the waste plastics are one or more of waste PP and waste PE.

[0012] Furthermore, the matrix asphalt is one of AH-110, AH-90, and AH-70; the waste oil includes one or more of waste cooking oil, waste animal oil, and waste lubricating oil.

[0013] The present invention also provides a method for preparing the above-mentioned environmentally friendly recycled asphalt mixture, comprising the following steps:

[0014] Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation;

[0015] Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture;

[0016] Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A;

[0017] Step 4, mixing and stirring the heated base asphalt, waste oil and mixture A;

[0018] Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

[0019] Further, the heating temperature of the recycled aggregate is 100-110°C, the heating temperature of the new aggregate is 190-200°C, and the heating temperature of the base asphalt is 150-170°C.

[0020] The present invention also provides application of the above-mentioned environmentally friendly recycled asphalt mixture in highway pavement materials.

[0021] The advantages and positive effects of the environmentally friendly recycled asphalt mixture and the preparation method thereof described in the present invention are:

[0022] 1. The present invention utilizes the recycling of waste asphalt mixture to produce new asphalt mixture, which not only saves costs, but also reduces the additional costs generated by the transportation and disposal of waste materials to a certain extent.

[0023] 2. The present invention uses the factory-mixed hot regeneration technology to recycle waste asphalt mixtures, which not only solves the environmental pollution problem of waste asphalt mixtures, but also saves stone resources and land resources. Most importantly, under the premise of ensuring the quality of the project, it saves investment and reduces the project cost, improves the traffic capacity of the highway, reduces transportation costs, is conducive to energy conservation and emission reduction, and has significant social benefits.

[0024] 3. The regeneration agent in the present invention uses rubber oil, polyamide and some waste as main raw materials. Compared with the traditional combination of light oil and resin, it does not contain harmful substances, is more energy-saving and environmentally friendly, and reduces costs.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a flowchart of a method for preparing an environmentally friendly recycled asphalt mixture in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0028] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0029] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. The experimental methods without specific conditions in the following examples are usually measured in accordance with national standards. The experimental instruments, equipment and reagents without source indication in the following examples are all commercially available raw materials.

[0030] The equipment used in each step of the following embodiments is conventional equipment. If there is no corresponding national standard, it is carried out according to the common international standards, conventional conditions, or conditions recommended by the manufacturer.

[0031] Unless otherwise defined or described, all professional and scientific terms used in the present invention have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein can be applied to the method of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0032] An environmentally friendly regenerated asphalt mixture comprises the following components in parts by weight: 30-50 parts of recycled aggregate, 40-60 parts of new aggregate, 3-7 parts of regeneration agent, 3-6 parts of base asphalt, and 1-5 parts of waste oil, wherein the regeneration agent comprises 65-85% of an oil component, 1-5% of a stabilizer component, 2-6% of a plasticizer component, and 15-35% of waste plastic powder.

[0033] The particle size of the coarse aggregate in the recycled aggregate is 10-25 mm, the particle size of the fine aggregate is 0-10 mm, and the mass ratio of the coarse aggregate to the fine aggregate is 1:1-1.5. The particle sizes of the new aggregate are 0-5 mm, 5-10 mm and 10-20 mm, and the usage ratio is 0-5 mm: 5-10 mm: 10-20 mm = 22:35:43.

[0034] The oil component is one or more of rubber oil, coconut oil or plant asphalt.

[0035] The stabilizer component is one or more of polyamide, phenolic resin, epoxy resin, quartz sand or limestone.

[0036] The plasticizer component is one or more of polyethylene terephthalate, polybutylene terephthalate, dioctyl phthalate, citrate, and vinyl acetate.

[0037] The waste plastics are one or more of waste PP and waste PE.

[0038] The matrix asphalt is one of AH-110, AH-90 and AH-70; the waste oil includes one or more of waste cooking oil, waste animal oil and waste lubricating oil.

[0039] A method for preparing an environmentally friendly recycled asphalt mixture comprises the following steps:

[0040] Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation;

[0041] Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture;

[0042] Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A;

[0043] Step 4, mixing and stirring the heated base asphalt, waste oil and mixture A;

[0044] Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

[0045] The heating temperature of recycled aggregate is 100-110℃, the heating temperature of new aggregate is 190-200℃, and the heating temperature of base asphalt is 150-170℃.

[0046] The gradation type of the mixture in the present invention is AC-20F.

[0047] Example 1

[0048] 40 parts of recycled aggregate, 50 parts of new aggregate, 4 parts of regeneration agent, 4 parts of base asphalt AH-70, 2 parts of waste animal fat, wherein the regeneration agent includes 70% coconut oil, 5% polyamide, 4% polyethylene terephthalate, and 21% waste PP.

[0049] The particle size of coarse aggregate in recycled aggregate is 10-25mm, the particle size of fine aggregate is 0-10mm, and the mass ratio of coarse aggregate to fine aggregate is 1: 1. The particle sizes of new aggregate are 0-5mm, 5-10mm and 10-20mm, and the usage ratio is 0-5mm: 5-10mm: 10-20mm = 22:35:43.

[0050] A method for preparing an environmentally friendly recycled asphalt mixture comprises the following steps:

[0051] Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation;

[0052] Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture;

[0053] Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A;

[0054] Step 4, mixing and stirring the heated base asphalt AH-70, waste animal fat and mixture A;

[0055] Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

[0056] The heating temperature of recycled aggregate is 105℃, the heating temperature of new aggregate is 190℃, and the heating temperature of base asphalt AH-70 is 160℃.

[0057] Example 2

[0058] 50 parts of recycled aggregate, 40 parts of new aggregate, 4 parts of regeneration agent, 4 parts of base asphalt AH-70, 2 parts of waste animal fat, wherein the regeneration agent includes 70% coconut oil, 5% polyamide, 4% polyethylene terephthalate, and 21% waste PE.

[0059] The particle size of coarse aggregate in recycled aggregate is 10-25mm, the particle size of fine aggregate is 0-10mm, and the mass ratio of coarse aggregate to fine aggregate is 1: 1. The particle sizes of new aggregate are 0-5mm, 5-10mm and 10-20mm, and the usage ratio is 0-5mm: 5-10mm: 10-20mm = 22:35:43.

[0060] A method for preparing an environmentally friendly recycled asphalt mixture comprises the following steps:

[0061] Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation;

[0062] Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture;

[0063] Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A;

[0064] Step 4, mixing and stirring the heated base asphalt AH-70, waste animal fat and mixture A;

[0065] Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

[0066] The heating temperature of recycled aggregate is 105℃, the heating temperature of new aggregate is 190℃, and the heating temperature of base asphalt AH-70 is 160℃.

[0067] Example 3

[0068] 60 parts of recycled aggregate, 30 parts of new aggregate, 4 parts of regeneration agent, 4 parts of matrix asphalt AH-70, 2 parts of waste animal fat, wherein the regeneration agent includes 70% coconut oil, 5% polyamide, 4% polyethylene terephthalate, and 21% waste PP.

[0069] The particle size of coarse aggregate in recycled aggregate is 10-25mm, the particle size of fine aggregate is 0-10mm, and the mass ratio of coarse aggregate to fine aggregate is 1: 1. The particle sizes of new aggregate are 0-5mm, 5-10mm and 10-20mm, and the usage ratio is 0-5mm: 5-10mm: 10-20mm = 22:35:43.

[0070] A method for preparing an environmentally friendly recycled asphalt mixture comprises the following steps:

[0071] Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation;

[0072] Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture;

[0073] Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A;

[0074] Step 4, mixing and stirring the heated base asphalt AH-70, waste animal fat and mixture A;

[0075] Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

[0076] The heating temperature of recycled aggregate is 105℃, the heating temperature of new aggregate is 190℃, and the heating temperature of base asphalt AH-70 is 160℃.

[0077] Example 4

[0078] 60 parts of recycled aggregate, 30 parts of new aggregate, 3 parts of regeneration agent, 4 parts of matrix asphalt AH-70, 2 parts of waste animal fat, wherein the regeneration agent includes 70% coconut oil, 5% polyamide, 4% polyethylene terephthalate, and 21% waste PP.

[0079] The particle size of coarse aggregate in recycled aggregate is 10-25mm, the particle size of fine aggregate is 0-10mm, and the mass ratio of coarse aggregate to fine aggregate is 1: 1. The particle sizes of new aggregate are 0-5mm, 5-10mm and 10-20mm, and the usage ratio is 0-5mm: 5-10mm: 10-20mm = 22:35:43.

[0080] A method for preparing an environmentally friendly recycled asphalt mixture comprises the following steps:

[0081] Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation;

[0082] Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture;

[0083] Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A;

[0084] Step 4, mixing and stirring the heated base asphalt AH-70, waste animal fat and mixture A;

[0085] Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

[0086] The heating temperature of recycled aggregate is 105℃, the heating temperature of new aggregate is 190℃, and the heating temperature of base asphalt AH-70 is 160℃.

[0087] Example 5

[0088] 60 parts of recycled aggregate, 30 parts of new aggregate, 5 parts of regeneration agent, 4 parts of matrix asphalt AH-70, 2 parts of waste animal fat, wherein the regeneration agent includes 70% coconut oil, 5% polyamide, 4% polyethylene terephthalate, and 21% waste PP.

[0089] The particle size of coarse aggregate in recycled aggregate is 10-25mm, the particle size of fine aggregate is 0-10mm, and the mass ratio of coarse aggregate to fine aggregate is 1: 1. The particle sizes of new aggregate are 0-5mm, 5-10mm and 10-20mm, and the usage ratio is 0-5mm: 5-10mm: 10-20mm = 22:35:43.

[0090] A method for preparing an environmentally friendly recycled asphalt mixture comprises the following steps:

[0091] Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation;

[0092] Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture;

[0093] Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A;

[0094] Step 4, mixing and stirring the heated base asphalt AH-70, waste animal fat and mixture A;

[0095] Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

[0096] The heating temperature of recycled aggregate is 105℃, the heating temperature of new aggregate is 190℃, and the heating temperature of base asphalt AH-70 is 160℃.

[0097] Example 6

[0098] 60 parts of recycled aggregate, 30 parts of new aggregate, 6 parts of regeneration agent, 4 parts of matrix asphalt AH-70, 2 parts of waste animal fat, wherein the regeneration agent includes 70% coconut oil, 5% polyamide, 4% polyethylene terephthalate, and 21% waste PP.

[0099] The particle size of coarse aggregate in recycled aggregate is 10-25mm, the particle size of fine aggregate is 0-10mm, and the mass ratio of coarse aggregate to fine aggregate is 1: 1. The particle sizes of new aggregate are 0-5mm, 5-10mm and 10-20mm, and the usage ratio is 0-5mm: 5-10mm: 10-20mm = 22:35:43.

[0100] A method for preparing an environmentally friendly recycled asphalt mixture comprises the following steps:

[0101] Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation;

[0102] Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture;

[0103] Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A;

[0104] Step 4, mixing and stirring the heated base asphalt AH-70, waste animal fat and mixture A;

[0105] Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

[0106] The heating temperature of recycled aggregate is 105℃, the heating temperature of new aggregate is 190℃, and the heating temperature of base asphalt AH-70 is 160℃.

[0107] Example 7

[0108] 60 parts of recycled aggregate, 30 parts of new aggregate, 7 parts of regeneration agent, 4 parts of matrix asphalt AH-70, 2 parts of waste animal fat, wherein the regeneration agent includes 70% coconut oil, 5% polyamide, 4% polyethylene terephthalate, and 21% waste PP.

[0109] The particle size of coarse aggregate in recycled aggregate is 10-25mm, the particle size of fine aggregate is 0-10mm, and the mass ratio of coarse aggregate to fine aggregate is 1: 1. The particle sizes of new aggregate are 0-5mm, 5-10mm and 10-20mm, and the usage ratio is 0-5mm: 5-10mm: 10-20mm = 22:35:43.

[0110] A method for preparing an environmentally friendly recycled asphalt mixture comprises the following steps:

[0111] Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation;

[0112] Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture;

[0113] Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A;

[0114] Step 4, mixing and stirring the heated base asphalt AH-70, waste animal fat and mixture A;

[0115] Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

[0116] The heating temperature of recycled aggregate is 105℃, the heating temperature of new aggregate is 190℃, and the heating temperature of base asphalt AH-70 is 160℃.

[0117] Table 1 Parameter settings of various embodiments

[0118] Recycling aggregate new aggregate Regeneration Agent Base asphalt Abandon animal fats Example 1 40 50 4 4 2 Example 2 50 40 4 4 2 Example 3 60 30 4 4 2 Example 4 60 30 3 4 2 Example 5 60 30 5 4 2 Example 6 60 30 6 4 2 Example 7 60 30 7 4 2

[0119] Performance Testing

[0120] The specific test steps of the test specimen performance test items refer to the relevant provisions of the "Highway Engineering Asphalt and Asphalt Mixture Test Procedure" (JTG E20-2011). The comparative example is ordinary asphalt mixture.

[0121] The high temperature stability of the recycled asphalt mixture was evaluated by the rutting test. The rutting test is to measure the deformation rate of the rutting formed by the test wheel moving back and forth under the specified temperature and load conditions, which is expressed as dynamic stability. The rutting test specimen is a 300mm×300mm×50mm plate specimen, the test temperature is 60℃, and the wheel pressure is 0.7MPa. The test results are shown in Table 2.

[0122] Table 2 Dynamic stability of rutting test

[0123] Dynamic stability (times / mm) Example 1 9511 Example 2 10056 Example 3 10241 Example 4 10223 Example 5 9914 Example 6 10058 Example 7 10265 Ordinary asphalt mixture 9505

[0124] It can be seen from Table 2 that the rutting resistance of recycled asphalt mixture is better than that of ordinary asphalt mixture, and with the increase of recycled aggregate content, the rutting resistance of recycled asphalt mixture is enhanced and the high temperature stability is better.

[0125] The immersion Marshall test and freeze-thaw splitting test were used to measure the residual stability and freeze-thaw splitting strength ratio TSR of the recycled asphalt mixture, respectively, and to evaluate the water stability of the recycled asphalt mixture. The test results are shown in Table 3.

[0126] Table 3 Water stability performance

[0127] Residual stability (%) Freeze-thaw splitting strength ratio TSR (%) Example 1 95.4 96.5 Example 2 90.5 86.2 Example 3 83.5 79.5 Example 4 82.0 77.4 Example 5 83.4 80.4 Example 6 82.5 79.6 Example 7 84.1 79.0 Technical requirements ≥80 ≥75

[0128] It can be seen from Table 2 that with the decrease of the amount of recycled aggregate in the recycled asphalt mixture, the water stability of the mixture becomes better and better.

[0129] Comprehensive analysis of Table 2 and Table 3 shows that the high temperature stability and water stability of the regenerated asphalt mixture prepared by mixing recycled aggregates and new aggregates in different proportions meet the standards and can be used for road repair and reconstruction. The present invention utilizes the recycling of waste asphalt mixture to produce new asphalt mixture, which not only saves costs, but also reduces the additional costs generated by the transportation and disposal of waste materials to a certain extent. At the same time, the factory-mixed hot regeneration technology is applied to recycle the waste asphalt mixture, which not only solves the environmental pollution problem of waste asphalt mixture, but also saves stone resources and land resources. And most importantly, under the premise of ensuring the quality of the project, it saves investment and reduces the project cost, improves the traffic capacity of the highway, reduces transportation costs, is conducive to energy conservation and emission reduction, and has significant social benefits.

[0130] Therefore, the present invention adopts the above-mentioned environmentally friendly recycled asphalt mixture and its preparation method, and applies factory-mixed hot regeneration technology to recycle waste asphalt mixture, which not only solves the environmental pollution problem of waste asphalt mixture, but also saves stone resources and land resources, while saving investment, reducing project costs, and is conducive to energy conservation and emission reduction, with significant social benefits.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An environmentally friendly recycled asphalt mixture, characterized in that: The invention comprises the following components in parts by weight: 30-50 parts of recycled aggregate, 40-60 parts of new aggregate, 3-7 parts of regeneration agent, 3-6 parts of matrix asphalt and 1-5 parts of waste oil, wherein the regeneration agent comprises 65-85% of oil component, 1-5% of stabilizer component, 2-6% of plasticizer component and 15-35% of waste plastic powder.

2. The environmentally friendly recycled asphalt mixture according to claim 1, characterized in that: The particle size of the coarse aggregate in the recycled aggregate is 10-25 mm, the particle size of the fine aggregate is 0-10 mm, and the mass ratio of the coarse aggregate to the fine aggregate is 1:1-1.5; the particle sizes of the new aggregate are 0-5 mm, 5-10 mm and 10-20 mm, and the usage ratio is 0-5 mm: 5-10 mm: 10-20 mm = 22:35:

43.

3. The environmentally friendly recycled asphalt mixture according to claim 1, characterized in that: The oil component is one or more of rubber oil, coconut oil or plant asphalt.

4. The environmentally friendly recycled asphalt mixture according to claim 1, characterized in that: The stabilizer component is one or more of polyamide, phenolic resin, epoxy resin, quartz sand or limestone.

5. The environmentally friendly recycled asphalt mixture according to claim 1, characterized in that: The plasticizer component is one or more of ethylene terephthalate, polybutylene terephthalate, dioctyl phthalate, citrate, and vinyl acetate.

6. The environmentally friendly recycled asphalt mixture according to claim 1, characterized in that: The waste plastics are one or more of waste PP and waste PE.

7. The environmentally friendly recycled asphalt mixture according to claim 1, characterized in that: The matrix asphalt is one of AH-110, AH-90 and AH-70; the waste oil includes one or more of waste cooking oil, waste animal oil and waste lubricating oil.

8. A method for preparing an environmentally friendly recycled asphalt mixture according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1, milling and crushing the aged asphalt pavement, discarding aggregates with a soil content of more than 50%, and crushing and screening to obtain recycled aggregates, evaluating the recycled aggregates, and testing the performance and mineral gradation; Step 2, determining the content of each component according to the test results and the ratio requirements of the mixture; Step 3, mixing and stirring the heated recycled aggregate and new aggregate, and adding a regeneration agent during the stirring process to obtain a mixture A; Step 4, mixing and stirring the heated base asphalt, waste oil and mixture A; Step 5: After the mixing is completed, the recycled asphalt mixture is formed.

9. The method for preparing an environmentally friendly recycled asphalt mixture according to claim 8, characterized in that: The heating temperature of recycled aggregate is 100-110℃, the heating temperature of new aggregate is 190-200℃, and the heating temperature of base asphalt is 150-170℃.

10. Use of the environmentally friendly recycled asphalt mixture as claimed in any one of claims 1 to 7 in highway pavement materials.

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