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CN-121974603-A - High-doping-amount RAP (RAP) regenerated asphalt mixture for alpine regions and preparation method thereof

CN121974603ACN 121974603 ACN121974603 ACN 121974603ACN-121974603-A

Abstract

The invention belongs to the technical field of RAP regenerated asphalt mixtures, and particularly relates to a high-doping-amount RAP regenerated asphalt mixture for alpine regions and a preparation method thereof. The high-doping amount RAP regenerated asphalt mixture for the alpine region is characterized by comprising, by mass, 50-60% of RAP, 3-6% of mineral powder, 1-3% of new asphalt, 1-2% of a composite regenerant, 1-2% of a modifier and the balance of new aggregate, wherein the composite regenerant comprises pine tar, plant-based epoxy ester oil, cashew nut shell oil and a penetrating agent, and the modifier comprises regenerated low-density polyvinyl chloride, hyperbranched epoxy resin and waste rubber powder coated by liquid polybutadiene rubber. The technical scheme provided by the invention solves the technical problems of poor low-temperature performance, water stability and freeze-thawing cycle stability when the high-doping amount RAP reclaimed asphalt mixture is used in alpine regions.

Inventors

  • NIU CHANGCHANG
  • QIAO ZHI
  • YAN XULIANG
  • QIAO RUIPING
  • ZHAO JIANXIONG
  • TIAN LU
  • DANG YAN
  • Duan Shangze
  • GAO FENGQUAN

Assignees

  • 内蒙古交通集团有限公司

Dates

Publication Date
20260505
Application Date
20260309

Claims (10)

  1. 1. A high-doping amount RAP regenerated asphalt mixture for alpine regions is characterized by comprising, by mass, 50-60% of RAP, 3-6% of mineral powder, 1-3% of new asphalt, 1-2% of a composite regenerant, 1-2% of a modifier and the balance of new aggregate; the composite regenerant consists of pine tar, plant-based epoxy ester oil, cashew nut shell oil and a penetrating agent; the modifier consists of regenerated low-density polyvinyl chloride, hyperbranched epoxy resin and waste rubber powder coated by liquid polybutadiene rubber.
  2. 2. The high-doping amount RAP reclaimed asphalt mixture for alpine regions according to claim 1, wherein the RAP comprises RAP with the particle size of 0-2.36mm, RAP with the particle size of 2.36-9.5mm and RAP with the particle size of 9.5-16mm, and the mass ratio of the RAP with the particle size of 0-2.36mm, the RAP with the particle size of 2.36-9.5mm and the RAP with the particle size of 9.5-16mm is 3:5-6:1-2.
  3. 3. The high and cold area high and doped RAP reclaimed asphalt mixture according to claim 1, wherein the mass ratio of the pine tar to the vegetable-based epoxy ester oil to the cashew nut shell oil to the penetrant is 4-4.5:4-4.5:1-2:0.1-0.3.
  4. 4. The high-blend RAP reclaimed asphalt mixture for alpine regions of claim 3, wherein said vegetable-based epoxy ester oil is epoxy linseed oil.
  5. 5. The high and cold area high and low blend amount RAP reclaimed asphalt mixture according to claim 1, wherein the mass ratio of the reclaimed low density polyvinyl chloride, the hyperbranched epoxy resin and the liquid polybutadiene rubber coated waste rubber powder is 10:1-2:2-3.
  6. 6. The high-doping amount RAP reclaimed asphalt mixture for alpine regions according to claim 5, wherein the molecular weight of the hyperbranched epoxy resin is 3000-3600g/mol, and the epoxy value is 0.40+/-0.05 mol/100g.
  7. 7. The high and cold area high and low blend amount RAP reclaimed asphalt mixture as claimed in claim 6, wherein the liquid polybutadiene rubber coated scrap rubber powder comprises liquid polybutadiene rubber, scrap rubber powder, dicumyl peroxide and accelerator NS.
  8. 8. The high-blend RAP reclaimed asphalt mixture for alpine regions of claim 7, wherein the vinyl content of said liquid polybutadiene rubber is 18-35wt% and the number average molecular weight is 2500-4500.
  9. 9. The high-doping amount RAP reclaimed asphalt mixture for alpine regions according to claim 8, wherein the preparation method of the modifier comprises the following steps of mixing liquid polybutadiene rubber, waste rubber powder, dicumyl peroxide and an accelerator NS, and stirring at a high speed to obtain liquid polybutadiene rubber coated waste rubber powder; and uniformly mixing the regenerated low-density polyvinyl chloride, the hyperbranched epoxy resin and the waste rubber powder coated by the liquid polybutadiene rubber, and extruding and granulating to obtain the modifier.
  10. 10. The method for preparing the high-doping amount RAP reclaimed asphalt mixture for the alpine region according to any one of claims 2 to 9, which is characterized by comprising the following steps: s1, crushing and screening RAP by utilizing a petroleum separation technology in a physical collision mode to obtain RAP with the particle size of 0-2.36mm, 2.36-9.5mm and 9.5-16 mm; S2, uniformly mixing the dried RAP, mineral powder and new aggregate to obtain a mixture; S3, adding a regenerant into the mixture, stirring, adding a modifier and new asphalt, and continuously stirring to obtain the high-doping-amount RAP regenerated asphalt mixture for the alpine region.

Description

High-doping-amount RAP (RAP) regenerated asphalt mixture for alpine regions and preparation method thereof Technical Field The invention belongs to the technical field of RAP regenerated asphalt mixtures, and particularly relates to a high-doping-amount RAP regenerated asphalt mixture for alpine regions and a preparation method thereof. Background Along with the rapid development of the highway construction industry in China, asphalt pavement enters a critical period of construction and maintenance from large-scale construction and maintenance. At present, a large amount of asphalt pavement recycling materials (RAP) generated during maintenance and maintenance cannot be fully recycled, and a large amount of waste RAP materials not only pollute the environment, but also seriously waste resources. The cyclic regeneration technology of low-doping amount RAP (30%) is mature, but the technology cannot achieve the purposes of reducing resource waste and engineering cost due to low utilization rate of the RAP, so that the cyclic regeneration of large-doping amount RAP is urgent. In addition, as the mixing amount of the RAP material increases, the low-temperature performance and the water stability of the reclaimed asphalt mixture are gradually deteriorated, and the reclaimed asphalt mixture has higher requirements on the low-temperature performance and the water stability of the reclaimed asphalt mixture because the reclaimed asphalt mixture has cold climate and long freeze thawing period in winter in northeast China and other areas of an inner Mongolian autonomous region. In the prior art, a large-doping amount of RAP regenerated asphalt mixture is reported, for example, china patent with publication number of CN120504517A discloses a high-doping amount of RAP regenerated asphalt mixture and a preparation method thereof, and the method comprises the following steps of 1, homogenizing an epoxy resin system and a rubber-asphalt composite system according to the weight ratio of 1:5-1:30 to obtain a composite modified asphalt system, 2, preheating a waste asphalt pavement material to 110-130 ℃, adding a petroleum ether regenerant and heating to 150-170 ℃ after dry mixing, and carrying out dry mixing again to obtain a mixture 1, 3, preheating new fine aggregate, coarse aggregate and steel slag in batches and adding the mixture 1 to obtain a mixture 2 with a primary grading framework after dry mixing, 4, adding the composite modified asphalt system obtained in the step 1 to the mixture 2, carrying out wet mixing to obtain a mixture 3, and finally obtaining the target regenerated asphalt mixture after homogenizing treatment of the mixture 3. The Chinese patent with publication number CN 118724506A discloses a reclaimed asphalt mixture and application thereof, wherein the reclaimed asphalt mixture comprises 50-60 parts by weight of RAP, 6-7wt% of old asphalt contained in the RAP, 4-5wt% of oil stone of the reclaimed asphalt mixture, and the grading composition of the new aggregate and the old aggregate in the RAP meets the target grading of AC-20 according to 100 parts by weight of the sum of the RAP, the new aggregate and the mineral powder. However, the above technical schemes are all carried out for 1 time of freeze thawing cycle, and the primary test is that the initial water damage resistance of the reclaimed asphalt mixture can not meet the performance requirements of high and cold areas with cold climate and long freeze thawing cycle in winter. Disclosure of Invention The invention mainly aims to provide a high-doping amount RAP regenerated asphalt mixture for high-cold areas and a preparation method thereof, so as to solve the technical problems of poor low-temperature performance, water stability and freeze-thawing cycle stability when the high-doping amount RAP regenerated asphalt mixture is used for the high-cold areas. In order to achieve the aim, the first aspect of the invention provides a high-doping amount RAP regenerated asphalt mixture for alpine regions, which comprises, by mass, 50-60% of RAP, 3-6% of mineral powder, 1-3% of new asphalt, 1-2% of a composite regenerant, 1-2% of a modifier and the balance of new aggregate. In some embodiments provided herein, the RAP comprises RAP with a particle size of 0-2.36mm, RAP with a particle size of 2.36-9.5mm, and RAP with a particle size of 9.5-16 mm. In some embodiments provided by the invention, the mass ratio of 0-2.36mm of RAP, 2.36-9.5mm of RAP and 9.5-16mm of RAP is 3:5-6:1-2. In some embodiments provided herein, the ore fines are selected from at least one of limestone ore fines, basalt ore fines, and blast furnace slag. In some embodiments provided herein, the new asphalt is grade 90 grade a road petroleum asphalt. In some embodiments provided herein, the composite regenerant consists of pine tar, a plant-based epoxy ester oil, cashew nut shell oil and a penetrant. In some embodiments provided herein, the mass ratio of pine tar, plant-based epoxy este