AU2021105463A4 - Environmentally-friendly warm-mix asphalt regenerant and preparation method thereof - Google Patents
Environmentally-friendly warm-mix asphalt regenerant and preparation method thereof Download PDFInfo
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- 239000012492 regenerant Substances 0.000 title claims abstract description 56
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/02—Working-up pitch, asphalt, bitumen by chemical means reaction
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2555/00—Characteristics of bituminous mixtures
- C08L2555/20—Mixtures of bitumen and aggregate defined by their production temperatures, e.g. production of asphalt for road or pavement applications
- C08L2555/24—Asphalt produced between 100°C and 140°C, e.g. warm mix asphalt
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2555/00—Characteristics of bituminous mixtures
- C08L2555/40—Mixtures based upon bitumen or asphalt containing functional additives
- C08L2555/60—Organic non-macromolecular ingredients, e.g. oil, fat, wax or natural dye
- C08L2555/62—Organic non-macromolecular ingredients, e.g. oil, fat, wax or natural dye from natural renewable resources
- C08L2555/64—Oils, fats or waxes based upon fatty acid esters, e.g. fish oil, olive oil, lard, cocoa butter, bees wax or carnauba wax
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2555/00—Characteristics of bituminous mixtures
- C08L2555/40—Mixtures based upon bitumen or asphalt containing functional additives
- C08L2555/80—Macromolecular constituents
- C08L2555/82—Macromolecular constituents from natural renewable resources, e.g. starch, cellulose, saw dust, straw, hair or shells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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Abstract
OF THE DISCLOSURE
Disclosed are an environment-friendly warm mix asphalt regenerant and a
preparation method thereof. The present disclosure belongs to the field of road
engineering, and aims to solve the problems of poor diffusion effect and higher mixing
temperature of the conventional asphalt regenerant material. The preparation method
comprises the following steps: Step one. Weighing bio-asphalt, epoxy soybean oil,
curing agent, straw fiber and epoxy resin; Step two. Putting the bio-asphalt in the raw
material into a reactor, adding the epoxy soybean oil, stirring at 50-60°C, adding straw
fiber, continuing stirring at 50-60°C to obtain an effective component of regenerant;
Step three. Mixing the effective component of the regenerant with the epoxy resin. The
performance of the aged asphalt is recovered by using effective components such as the
bio-asphalt, the diffusion effect is enhanced through the epoxy soybean oil, the
warm-mixing production of the regenerated asphalt mixture is realized, and the
production process is simple and energy-saving.
Description
[01] The present disclosure belongs to the field of road engineering, and specifically relates to an environment-friendly warm-mix asphalt regenerant and a preparation method thereof.
[02] By the end of 2018, the total mileage of highways in China reached 4,846,500 kilometers, of which highway maintenance mileage accounted for 98.2% of the total highway mileage, while the second and above highway mileage reached 647,800 kilometers, of which a considerable part of the asphalt concrete pavement, so every year tens of tons of reclaimed asphalt pavement (RAP) will be generated due to road maintenance and other projects. At present, the comprehensive disposal of RAP is gradually becoming an important research content for the sustainable development of the transportation field. The "Outline for the Construction of a Powerful Transportation Country" also pointed out that "promote resource conservation and intensive utilization, promote the recycling and comprehensive utilization of waste materials, and promote the transformation of transportation development from the pursuit of speed and scale to more emphasis on quality and efficiency." However, limited by the progress of material development and the limitations of construction technology, the current utilization rate of asphalt pavement reclaimed aggregates in China is still low, and it is basically impossible to achieve in-situ high-end recycling of pavement recycled materials. This is closely related to the performance of regenerated asphalt mixture, and a large amount of RAP will often have a negative impact on the performance of the asphalt mixture. The quality of the regenerant is an important factor in determining the performance of the regenerated asphalt mixture. Therefore, for the efficient recycling of RAP, the development of a new type of asphalt regenerant is an inevitable trend in the development of road engineering in the future.
[03] On the other hand, regenerated asphalt mixtures often form a five-layer sandwich structure of old aggregate/old asphalt/regenerant/new asphalt/new aggregate between the aggregate and the aggregate, or a seven-layer sandwich structure of old aggregate/old asphalt/ regenerant /new asphalt/ regenerant/old asphalt/old aggregate, and the performance damage of the recycled structure is likely to occur in the weak link in the sandwich structure, which also makes the cracking problem the main performance problem faced by the recycled mixture. Therefore, the design of asphalt regenerant materials should not only consider the diffusion effect of the effective components in the aging asphalt, but also pay attention to the enhanced design of the interface performance to ensure that the performance of the aging asphalt in the recycled material is restored, and the weakness in the recycled sandwich structure can also be consolidated and strengthened, aiming to ultimately improve the overall performance of regenerated asphalt mixtures.
[04] In addition, "energy saving and emission reduction" and "C emission reduction" are both important measures to implement the concept of sustainable development. In the production process of asphalt mixture, a mixing temperature of 100°C can save energy by about 25%-30% year-on-year, and can reduce C emissions to a certain extent. Therefore, in the process of recycling waste asphalt mixtures, if the uniformity and road performance of the recycled materials can be ensured, and the mixing temperature can be reduced, it will be an effective way to achieve "energy saving and emission reduction". In addition, bio-asphalt is a secondary product of renewable energy materials, and has low viscosity, which can be mixed and constructed at a lower temperature, and the material components of bio-asphalt are conducive to the recovery of aging asphalt performance in RAP. At the same time, road fibers made from crop straws can also improve the comprehensive performance of regenerated asphalt mixtures. In short, the application of environmental protection concepts and the use of environmentally friendly materials to develop asphalt regenerants will achieve significant environmental benefits while realizing efficient recycling of waste asphalt mixtures.
[05] Preferred embodiments of the present invention seek to provide an environmentally-friendly warm-mix asphalt regenerant and a preparation method thereof.
[06] According to an aspect of the present invention, there is provided an environment-friendly warm-mix asphalt regenerant obtained by mixing the following components in parts by mass: 20-50 parts of a bio-asphalt, 20-50 parts of an epoxy soybean oil, 10-15 parts of a curing agent, 5-10 parts of a straw fiber and 10-15 parts of an epoxy resin.
[07] The method for preparing the environment-friendly warm-mix asphalt regenerant of the present disclosure is realized by the following steps:
[08] Step one. Weighing 20-50 parts of the bio-asphalt, 20-50 parts of the epoxy soybean oil, 10-15 parts of the curing agent, 5-10 parts of the straw fiber and 10-15 parts of the epoxy resin according to the mass parts as raw materials;
[09] Step two. Putting the bio-asphalt in the raw material into a reactor, adding the curing agent, stirring evenly at a temperature of 50-60°C to obtain a mixture, heating the mixture at a temperature of 100-110°C for 4-8h, then cooling to 55-65 °C, adding the epoxy soybean oil, stirring at 50-60°C, adding straw fiber, continue stirring at 50-60°C, and cooling to room temperature to obtain an effective component of regenerant;
[10] Step three. When using, mixing the effective component of the regenerant with the epoxy resin to obtain the environmentally friendly warm-mix asphalt regenerant.
[11] The environment-friendly warm-mix asphalt regenerant of the present disclosure uses bio-asphalt as the cementing component. On the one hand, the bio-asphalt can restore the performance of the aged asphalt, and on the other hand, it can enhance the performance of the asphalt mortar in the mixture, thereby improving the application performance of recycled material. The epoxy soybean oil is as a diffusion component, which is composed of linoleic acid, oleic acid, palmitic acid and so on. It is not volatile and has a good diffusion effect in asphalt, which can quickly diffuse and restore the characteristics of aging asphalt. The present disclosure uses epoxy resin and curing agent as the polymer reinforcement component. The epoxy resin and the curing agent can form macromolecules with a network structure to strengthen the interlayer interface performance of the regenerated structure. At the same time, some fatty acids contained in the bio-asphalt will also react with the curing agent. The active groups in the product will react with the epoxy resin to form a three-dimensional network structure, which further strengthens the interlayer interface performance of the regenerated structure and improves the crack resistance of the regenerated material. Straw fiber is a fiber-reinforced component with a porous surface and high oil absorption rate, which can improve the performance of the recycled asphalt mortar and increase the resistance to deformation of the recycled mixture.
[12] The present disclosure uses bio-asphalt and other effective components to restore the performance of aging asphalt, strengthens the interface performance of the regenerated structure through the "reinforced design", enhances the diffusion effect through the epoxy soybean oil, and realizes the warm-mixing production (100°C-130°C) of the regenerated asphalt mixture, the production process is simple and energy-saving, and has good environmental protection benefits.
[13] FIG.1 is a test diagram of the adhesion effect of the environment-friendly warm-mix asphalt regenerant and the aged asphalt interface obtained in Example 1;
[14] FIG. 2 is a splitting tensile strength test diagram of the recycled mixture in Example 1;
[15] FIG. 3 is a test diagram of the adhesion effect of the environment-friendly warm-mix asphalt regenerant and the aged asphalt interface obtained in Example 2;
[16] FIG. 4 is the splitting tensile strength test diagram of the recycled mixture in Example 2.
[17] Specific Implementation 1: The environmentally-friendly warm-mix asphalt regenerant of this implementation obtained by mixing the following components in parts by mass: 20-50 parts of a bio-asphalt, 20-50 parts of an epoxy soybean oil, 10-15 parts of a curing agent, 5-10 parts of a straw fiber and 10-15 parts of an epoxy resin.
[18] Specific Implementation 2: This implementation is different from the Specific Implementation 1 in that the bio-asphalt is a vegetable asphalt obtained by the production of residual oil after the production of refined vegetable oil.
[19] Specific Implementation 3: This implementation is different from Specific Implementation 1 or 2 in that the curing agent is a modified fatty amine curing agent.
[20] In this implementation, the modified fatty amine curing agent can react with the epoxy resin at room temperature.
[21] Specific Implementation 4: This implementation is different from one of Specific Implementations 1-3 in that the straw fiber is corn straw fiber, the fiber length is 0.5 mm-3 mm, and the fiber diameter is 50-400m.
[221 Specific Implementation 5: This implementation is different from one of Specific Implementations 1-4 in that the mass ratio of the curing agent to the epoxy resin is 1:1-1:1.5.
[23] Specific Implementation 6: This implementation is different from one of Specific Implementations 1-5 in that the mass ratio of the bio-asphalt, the curing agent and the epoxy resin is 100: (40-60): (25-35).
[24] Specific Implementation 7: The preparation method of the environmentally-friendly warm-mix asphalt regenerant of this implementation is carried out in the following steps:
[25] Step one. Weighing 20-50 parts of the bio-asphalt, 20-50 parts of the epoxy soybean oil, 10-15 parts of the curing agent, 5-10 parts of the straw fiber and 10-15 parts of the epoxy resin according to the mass parts as raw materials;
[26] Step two. Putting the bio-asphalt in the raw material into a reactor, adding the curing agent, stirring evenly at a temperature of 50-60°C to obtain a mixture, heating the mixture at a temperature of 100-110°C for 4-8h, then cooling to 55-65 °C, adding the epoxy soybean oil, stirring at 50-60°C, adding the straw fiber, continuing stirring at -60°C, and cooling to room temperature to obtain an effective component of the regenerant;
[27] Step three. When using (before the mixture is ready to be mixed), mixing the effective component of the regenerant with the epoxy resin to obtain the environmentally-friendly warm-mix asphalt regenerant.
[28] The effective components of the regenerant and epoxy resin in this implementation are stored separately. Before the mixture is ready to be mixed, the effective components of the regenerant and epoxy resin are mixed at room temperature, and then added to the waste mixing equipment together with the reclaimed aggregates.
[29] Specific Implementation 8: This implementation is different from Specific Implementation 7 in that in step 2, the curing agent is added and stirred at a temperature of 50-60°C at 180r/min-240r/min for 10-15 min.
[30] Specific Implementation 9: This implementation is different from Specific Implementation 7 or 8 in that the mixture in step 2 is placed in an oven at 105°C and heated for 6 h.
[31] Specific Implementation 10: This implementation is different from one of Specific Implementations 7-9 in that in step two, the epoxy soybean oil is added and stirred at a temperature of 50-60°C and a rotation speed of 180r/min-240r/min for 5-10 min.
[32] Example 1: The method for preparing the environmentally-friendly warm-mix asphalt regenerant in this example was carried out in the following steps:
[33] Step one. 25 parts of the bio-asphalt, 50 parts of the epoxy soybean oil, 14 parts of the curing agent, 5 parts of the straw fiber and 10 parts of the epoxy resin were weighed as raw materials according to the mass parts;
[34] Step two. The bio-asphalt was added into a reactor, the curing agent was added, stirred with a mixer at 200r/min for 15 min at 60°C to obtain a mixture, the mixture was placed in an oven at 105°C to heat for 6h, then cooled to 60°C, epoxy soybean oil was added, stirred at 200r/min for 10 min at 60°C, the straw fiber was added, stirred for 15 min at 200r/min, and then cooled to room temperature to obtain the effective components of the regenerant;
[35] Step three. The effective components of the regenerant were mixed with the epoxy resin at room temperature to obtain the environmentally-friendly warm-mix asphalt regenerant.
[36] The test method under the linear loading mode disclosed in the publication number CN108645705A entitled the patent name "Test device for evaluation of interface performance of asphalt recycled film" was adopted. The interface energy index was used to evaluate the expansion, fusion and bonding characteristics of the recycled fusion layer. The interface energy was the area enclosed by the force-displacement (FL) curve. During the test, the preload force was ION and the test stop force was 30N to eliminate the invalid loading caused by the virtual contact of the loading device at the beginning and end of the curve.
[37] The matrix asphalt and epoxy soybean oil were taken as Control Group 1, and bio-asphalt and epoxy soybean oil were taken as Control Group 2. The aging asphalt was asphalt from a highway I reclaimed material that has been in service for more than years. The results are shown in FIG. 1.
[38] Compared with the control group, the environmentally-friendly warm-mix asphalt regenerant obtained in this example has better interfacial diffusion and adhesion effects with the aged asphalt. The interfacial energy can reach 82.34mJ, which is 20% and 6% higher than that of Control Group 1 and Control Group 2, respectively.
[39] The splitting tensile strength at 15°C was used to evaluate the crack resistance of the regenerated asphalt mixture. The regenerated asphalt mixture was prepared with the regenerant prepared in Example 1. The regenerated asphalt mixture was made by mixing the regenerant and aged asphalt at 110°C. The regenerated asphalt mixture prepared by matrix asphalt and epoxy soybean oil was taken as Control Group 1, and the regenerated asphalt mixture prepared by bio-asphalt and epoxy soybean oil was taken as Control Group 2. Using recycled material from highway I that has been in service for more than 15 years, the aged asphalt content was 3.7%, the reclaimed aggregate gradation reached the AC-16 standard, the reclaimed aggregate blending ratio was 100%, and the content standard of regenerant was to make the oil-stone ratio of AC-16 regenerated mixture reach 4.9%, and the mixing temperature of the mixture was 100-110C. The results are shown in FIG. 2.
[40] The splitting tensile strength of the regenerated asphalt mixture prepared with the regenerant in Example 1 is better than that of the regenerated mixture in control group. The splitting tensile strength is 1.58MPa, and the splitting tensile strength is 20% and 4% higher than that of Control Group 1 and Control Group 2, respectively. The anti-cracking performance of the regenerant prepared in Example 1 is better than that of the control group.
[41] Example 2: The difference between this example and Example 1 was that in step 1, parts of the bio-asphalt, 20 parts of the epoxy soybean oil, 14 parts of the curing agent, 5 parts of the straw fiber and 13 parts of the epoxy resin were weighed according to the mass parts as raw materials.
[42] The matrix asphalt and epoxy soybean oil were taken as Control Group 1, and bio-asphalt and epoxy soybean oil were taken as Control Group 2. The aging asphalt was asphalt from a highway II reclaimed material that has been in service for more than years. The results are shown in FIG. 3.
[43] Compared with the control group, the regenerant prepared in Example 2 has better interfacial diffusion and adhesion with the aged asphalt. The interfacial energy is 70.44mJ, which is 92% and 20% higher than that of the Control Group 1 and Control Group 2, respectively.
[441 The splitting tensile strength at 15°C was used to evaluate the crack resistance of the regenerated asphalt mixture. The regenerated asphalt mixture was prepared with the regenerant prepared in Example 2. The regenerated asphalt mixture prepared by matrix asphalt and epoxy soybean oil was taken as Control Group 1, and the regenerated asphalt mixture prepared by bio-asphalt and epoxy soybean oil was taken as Control Group 2. Using recycled material from highway II that has been in service for more than years, the aged asphalt content was 3%, the reclaimed aggregate gradation reached the AC-20 standard, the reclaimed aggregate blending ratio was 85%, the new machine-made sand was 15%, and the content standard of regenerant was to make the oil-stone ratio of AC-20 regenerated mixture reach 4.4%, and the mixing temperature of the mixture was 100-110°C. The results are shown in FIG. 4.
[45] The splitting tensile strength of the regenerated asphalt mixture prepared by using the regenerant of Example 2 is better than that of the control regenerated mixture, the splitting tensile strength is 1.11MPa, and the splitting tensile strength is 28% and 29% higher than that of the Control Group 1 and Control Group 2, respectively. The anti-cracking performance of the regenerant of Example 2 is better than that of the control group.
[46] In addition, the strength and high and low temperature performance of the regenerated asphalt mixture prepared by the regenerant of Example 1 and Example 2 were verified. The results are shown in Table 1.
[47] Table 1 Performance of regenerated asphalt mixture
[48] type of dosage of type of Marshall dynamic flexural regenerant RAP regenerated stability stability strain at low mixture (KN) (times/mm) temperature (gc) Example 1 100% AC-16 10.3 3825 2720 Example 2 85% AC-20 7.1 1832 3975
[49] The regenerant in Example 1 and Example 2 has good anti-crack performance, and the road performance of the prepared regenerated asphalt mixture can meet the requirements of the indicators of the secondary road. It realizes the large-scale RAP blending, adopts the warm-mix production method, and also uses environmentally-friendly regenerant materials, which effectively implements the sustainable development policy, and has good social and environmental benefits.
[50] Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
[51] The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.
Claims (5)
1. An environmentally-friendly warm-mix asphalt regenerant obtained by mixing the following conponents in parts by mass: 20-50 parts of a bio-asphalt, 20-50 parts of an epoxy soybean oil, 10-15 parts of a curing agent, 5-10 parts of a straw fiber and -15 parts of an epoxy resin.
2. The environment-friendly warm-mix asphalt regenerant according to claim 1, wherein the bio-asphalt is vegetable asphalt produced from residual oil after refined vegetable oil production.
3. The environment-friendly warm-mix asphalt regenerant according to claim 1, wherein the curing agent is a modified fatty amine curing agent; wherein the straw fiber is corn straw fiber, the fiber length is 0.5mm-3mm, and the fiber diameter is 50-400km; wherein the mass ratio of the curing agent to the epoxy resin is 1:1-1:1.5; wherein the mass ratio of the bio-asphalt, the curing agent and the epoxy resin is 100: (40-60): (25-35).
4. A method for preparing the environmentally-friendly warm-mix asphalt regenerant, wherein the preparation method is realized by the following steps: Step one. Weighing 20-50 parts of a bio-asphalt, 20-50 parts of an epoxy soybean oil, 10-15 parts of a curing agent, 5-10 parts of a straw fiber and 10-15 parts of an epoxy resin according to the mass parts as raw materials; Step two. Putting the bio-asphalt in the raw material into a reactor, adding the curing agent, stirring evenly at a temperature of 50-60°C to obtain a mixture, heating the mixture at a temperature of 100-110°C for 4-8h, then cooling to 55-65 °C, adding the epoxy soybean oil, stirring at 50-60°C, adding straw fiber, continuing stirring at -60°C, and cooling to room temperature to obtain an effective component of regenerant; Step three. When using, mixing the effective component of the regenerant with the epoxy resin to obtain the environmentally-friendly warm-mix asphalt regenerant.
5. The method for preparing the environmentally-friendly warm-mix asphalt regenerant according to claim 4, wherein in step two, adding the curing agent and stirring at a temperature of 50-60°C at 180r/min-240r/min for 10-15 min; wherein the mixture in step two is placed in an oven at 105°C and heated for 6 h; wherein the epoxy soybean oil in the raw material is added in step two, and stirred at a speed of 180r/min-240r/min at a temperature of 50-60°C for 5-10 min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115073061A (en) * | 2022-05-12 | 2022-09-20 | 福建农林大学 | Regenerated asphalt mixture and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115073061A (en) * | 2022-05-12 | 2022-09-20 | 福建农林大学 | Regenerated asphalt mixture and preparation method thereof |
| CN115073061B (en) * | 2022-05-12 | 2023-02-10 | 福建农林大学 | Regenerated asphalt mixture and preparation method thereof |
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