Search

CN-121974602-A - High-heat-doped regenerated thin asphalt mixture and preparation method thereof

CN121974602ACN 121974602 ACN121974602 ACN 121974602ACN-121974602-A

Abstract

The invention relates to the technical field of road maintenance, in particular to a high-heat-doped regenerated thin asphalt mixture and a preparation method thereof. The raw materials for forming the Gao Canre regenerated thin asphalt mixture comprise 40-45 parts of recycled old materials, 1.4-1.6 parts of regenerant and the balance of new asphalt mixture by 100 parts of Gao Canre regenerated thin asphalt mixture by weight. The high heat-doped regenerated thin-layer asphalt mixture provided by the embodiment of the invention reduces the viscosity of the mixture while reducing the performance of the cementing material of the old asphalt material, adopts a warm mixing process to produce the regenerated asphalt mixture, reduces the mixing energy consumption, and has the advantages of high blending rate of the old material, good stability of the mixture, high construction workability, energy conservation and emission reduction.

Inventors

  • ZHAO JUN
  • WU YICHUN
  • LIU XUAN
  • LV PENGFEI
  • Si Luting
  • ZHU YUNLONG
  • YIN ZHIHONG
  • LIU HAN

Assignees

  • 浙江顺畅高等级公路养护有限公司
  • 内蒙古交工养护工程技术有限责任公司

Dates

Publication Date
20260505
Application Date
20260306

Claims (10)

  1. 1. The high heat-doped regenerated thin asphalt mixture is characterized in that the raw materials for forming the Gao Canre regenerated thin asphalt mixture comprise 40-45 parts of recycled old materials, 1.4-1.6 parts of regenerant and the balance of new asphalt mixture by taking 100 parts by weight of Gao Canre regenerated thin asphalt mixture; wherein the coarse aggregate of the new asphalt mixture comprises materials with the particle size of 9.5-16mm, materials with the particle size of 4.75-9.5mm and materials with the particle size of 2.36-4.75 mm; The recycled materials are materials formed by crushing and screening AC-13C modified asphalt pavement milling materials.
  2. 2. The high heat doped recycled thin layer asphalt mixture according to claim 1, wherein the Gao Canre recycled thin layer asphalt mixture meets the following requirements: (1) The porosity of the Gao Canre regenerated thin-layer asphalt mixture is 3.3% -3.9%; (2) The implementation thickness of Gao Canre regenerated thin-layer asphalt mixture is 2.5cm.
  3. 3. The highly heat-doped recycled thin asphalt mixture according to claim 1, wherein the raw materials for forming the recycled old material comprise 66-74 parts of recycled coarse aggregate, 19-27 parts of recycled fine aggregate and 5-9 parts of recycled mineral powder, based on 100 parts by weight of the recycled old material.
  4. 4. The high heat doped regenerated thin layer asphalt mixture according to claim 3, wherein the particle size of the regenerated coarse aggregate is more than 2.36mm, the particle size of the regenerated fine aggregate is 0.075-2.36mm, and the particle size of the regenerated mineral powder is less than 0.075 mm.
  5. 5. The high heat doped regenerated thin layer asphalt mixture according to claim 3, wherein the regenerated coarse aggregate and the regenerated fine aggregate are basalt or diabase respectively, and the regenerated mineral powder is basalt mineral powder or diabase mineral powder.
  6. 6. The high heat doped regenerated thin layer asphalt mixture according to claim 1, wherein the new asphalt mixture comprises mineral aggregate and special modified asphalt, and the mass of the special modified asphalt is 5.5-6.1% of the mass of the mineral aggregate; wherein, the mineral aggregate comprises 66-74 parts of coarse aggregate, 19-27 parts of fine aggregate and 5-9 parts of mineral powder by 100 parts of mineral aggregate; Preferably, the coarse aggregate and the fine aggregate are basalt or diabase respectively, and the mineral powder is basalt mineral powder or diabase mineral powder.
  7. 7. The high heat-doped regenerated thin-layer asphalt mixture according to claim 6, wherein the special modified asphalt is formed by mixing SBS modified asphalt and a secondary modifier according to the mass ratio of (8.8-9.2) (1.2-0.8), wherein the SBS modified asphalt is asphalt processed by adding 3-5% of SBS modifier into grade-A90 matrix asphalt; Preferably, the secondary modifier and the regenerant are materials prepared from stearamide, stearic acid, a plasticizer and engine oil.
  8. 8. The high heat doped recycled thin layer asphalt mixture according to claim 6, wherein the recycled material and the mineral aggregate have a grading type of UTFC-R, respectively, specifically: 100% by mass of the sieve with 16mm sieve size, 92-100% by mass of the sieve with 13.2mm sieve size, 70-78% by mass of the sieve with 9.5mm sieve size, 36-44% by mass of the sieve with 4.75mm sieve size, 26-34% by mass of the sieve with 2.36mm sieve size, 18-26% by mass of the sieve with 1.18mm sieve size, 14-20% by mass of the sieve with 0.6mm sieve size, 9-15% by mass of the sieve with 0.3mm sieve size, 5-12% by mass of the sieve with 0.15mm sieve size and 5-9% by mass of the sieve with 0.075mm sieve size.
  9. 9. The highly heat-doped recycled thin-layer asphalt mixture according to claim 1, wherein the 9.5-16mm material accounts for 31-43% of the mass of the coarse aggregate, the 4.75-9.5mm material accounts for 43-55% of the mass of the coarse aggregate, and the 2.36-4.75mm material accounts for 8-20% of the mass of the coarse aggregate.
  10. 10. A method of preparing a highly heat-doped recycled thin asphalt mixture according to claim 1, comprising mixing a recycled old material with a recycling agent to form a recycled mixture, and mixing the recycled mixture with a new asphalt mixture; preferably, the method comprises the steps of uniformly mixing the regenerated coarse aggregate, the regenerated fine aggregate and the regenerated mineral powder at 130-150 ℃ and then mixing the mixture with a regenerant for 3-5min to form a regenerated mixture; Mixing coarse aggregate, fine aggregate and mineral powder uniformly at 130-150 ℃, and then mixing with special modified asphalt for 1-3min to form a new asphalt mixture; the recycled mixture is mixed with the new asphalt mixture for 2-3 times at 130-150 ℃.

Description

High-heat-doped regenerated thin asphalt mixture and preparation method thereof Technical Field The invention relates to the technical field of road maintenance, in particular to a high-heat-doped regenerated thin asphalt mixture and a preparation method thereof. Background Along with the gradual perfection of road networks in China, the traditional road engineering construction is changed from 'reconstruction light maintenance' to 'construction coexistence', and the main construction process of the road surface maintenance operation in the road engineering maintenance industry in China is 'milling and heavy paving', so that a large amount of waste asphalt milling materials are generated while the use effect of the road surface is effectively recovered, the resource waste is caused, and a large amount of land occupation is caused due to the stacking problem. The asphalt pavement thin layer cover is popular with more and more highway constructors because of the characteristics of low resource investment, convenient construction process and rapid recovery of road surface functions. However, most asphalt materials forming expressways or other highway engineering are AC13 or AC16, the maximum particle size of the two materials is larger, for example, the maximum particle size of the AC13 is 16mm, while the maximum particle size of asphalt materials forming a traditional thin layer (2.5 cm thick) is 12mm, and mineral materials with the maximum particle size of 16mm cannot form a framework in a structural layer with the thickness of 2.5 cm. Therefore, the hot recycled asphalt mixture in the thin-layer cover surface field of China is limited by the influence of the particle size of aggregate, the development speed of the hot recycled asphalt mixture is low, the mixing proportion of recycled materials is generally 10-15%, and the hot recycled asphalt mixture is contrary to the sustainable development national policy of China and cannot meet the environmental protection requirements of the industries of energy conservation and emission reduction. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a high-heat-doped regenerated thin asphalt mixture and a preparation method thereof. The high-heat-doped regenerated thin-layer asphalt mixture provided by the embodiment of the invention can reduce the viscosity of the mixture while reducing the performance of the cementing material of the old asphalt material, adopts a warm mixing process to produce the regenerated asphalt mixture, reduces the mixing energy consumption, and has the advantages of high blending rate of the old asphalt material, good stability of the mixture, high construction workability, energy conservation and emission reduction. The invention is realized in the following way: in a first aspect, the invention provides a high heat-doped regenerated thin asphalt mixture, and the raw materials for forming the Gao Canre regenerated thin asphalt mixture comprise 40-45 parts of recycled materials, 1.4-1.6 parts of regenerant and the balance of new asphalt mixture based on 100 parts by weight of Gao Canre regenerated thin asphalt mixture; wherein the coarse aggregate of the new asphalt mixture comprises materials with the particle size of 9.5-16mm, materials with the particle size of 4.75-9.5mm and materials with the particle size of 2.36-4.75 mm; The recycled materials are materials formed by crushing and screening AC-13C modified asphalt pavement milling materials. In an alternative embodiment, the Gao Canre recycled thin-layer asphalt mix meets the following requirements: (1) The porosity of the Gao Canre regenerated thin-layer asphalt mixture is 3.3% -3.9%; (2) The implementation thickness of Gao Canre regenerated thin-layer asphalt mixture is 2.5cm. In an alternative embodiment, the raw materials forming the recycled old material include 66-74 parts of recycled coarse aggregate, 19-27 parts of recycled fine aggregate and 5-9 parts of recycled mineral powder, based on 100 parts by weight of the recycled old material. In an alternative embodiment, the particle size of the regenerated coarse aggregate is above 2.36mm, the particle size of the regenerated fine aggregate is 0.075-2.36mm, and the particle size of the regenerated mineral powder is below 0.075 mm. In an alternative embodiment, the regenerated coarse aggregate and the regenerated fine aggregate are basalt or diabase respectively, and the regenerated mineral powder is basalt mineral powder or diabase mineral powder. In an alternative embodiment, the new asphalt mixture comprises mineral aggregate and special modified asphalt, wherein the mass of the special modified asphalt is 5.5-6.1% of the mass of the mineral aggregate; wherein, the mineral aggregate comprises 66-74 parts of coarse aggregate, 19-27 parts of fine aggregate and 5-9 parts of mineral powder by 100 parts of mineral aggregate; Preferably, the coarse aggregate and the fine aggregat