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Preparation method of recycled asphalt mixture

A technology of recycled asphalt and mixture, which is applied in the direction of sustainable waste treatment, solid waste management, and climate sustainability. Improved performance, anti-rutting performance, and high-temperature stability, and reduced regeneration costs

Active Publication Date: 2020-05-01
六安市共鑫道路材料有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Because the waste asphalt mixture is exposed to sunlight and rain for a long time, aging phenomenon inevitably occurs, that is, the components of the asphalt binder change, which greatly reduces the performance of the asphalt; and because the skeleton material of the waste is complex, it is difficult to analyze its composition. Particle size ratio, resulting in the inability to correctly obtain the particle size gradation when designing the mix ratio of recycled asphalt mixture. In order to improve the performance of waste materials, it is usually necessary to add specific regeneration aids, etc., which increases the application cost of waste materials

Method used

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  • Preparation method of recycled asphalt mixture

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Embodiment 1

[0038] Samples of recycled asphalt mixtures with different dosages (30%, 40%, 50%) were prepared by the traditional method and the method of the present invention for comparative research.

[0039] AC~20 type recycled asphalt mixture (30% RAP) synthetic mineral composition and mass ratio: 65 parts of new aggregate, including 21 parts of 0-3mm machine sand, 12 parts of 3-5mm crushed stone, 5-10mm 15 parts of gravel, 10 parts of 10-17mm gravel, 7 parts of 17-26.5mm gravel; 30 parts of recycled asphalt mixture, including 12 parts of 0-5mm material, 6 parts of 5-10mm material, 12 parts of 10-17mm material , After the extraction test, the oil content of 0-5mm material is 5wt%, the oil content of 5-10mm material is 3.8wt%, and the oil content of 10-17mm material is 3.5wt%; 5 parts of mineral powder; 4.82 parts of total asphalt , minus 1.248 parts of oil content in the recycled asphalt mixture, the required amount of new asphalt (A70-A base asphalt) is 3.572 parts;

[0040] AC~20 ty...

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Abstract

The invention discloses a preparation method of a recycled asphalt mixture. The preparation method comprises the following steps: (1) kneading, extruding, crushing, screening and grading waste recycled from a pavement by utilizing a crushing and screening machine; 2) carrying out an extraction test on the crushed and graded asphalt mixture waste material, and determining mineral aggregate gradation and asphalt content; 3) washing and screening each grade of new material, and determining the grading of each grade of new material; 4) respectively heating the new aggregate, asphalt and mineral powder to 160-175 DEG C by adopting a thermal radiation heating mode, and heating the waste material to 140-145 DEG C; and 5) carrying out dry mixing on the new aggregate for 90 + / -2 s, adding 40-50 wt%of asphalt, mixing for 100 + / -2 s, adding the waste material and the remaining asphalt, performing mixing for 30 + / -2 s, and finally adding the mineral powder, and performing mixing for 30 + / -2 s. According to the method, the stable pavement performance is still achieved when the regeneration ratio reaches 50%; the dynamic stability of the recycled asphalt mixture can reach 8000 times / mm or above, and the dynamic stability is 16-19 KN; and no regeneration additive is added, so that the regeneration cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of regenerated asphalt mixture, belonging to the field of road engineering. Background technique [0002] A large amount of waste will be produced in the repair and reconstruction of old roads, and these old materials still have high utilization value as a kind of road resources. Therefore, the recycling and reuse of waste materials has quite high economic benefits and environmental protection significance. [0003] Because the waste asphalt mixture is exposed to sunlight and rain for a long time, aging phenomenon will inevitably occur, that is, the composition of the asphalt binder changes, which greatly reduces the asphalt performance; and because the skeleton material of the waste material is complex, it is not easy to analyze its composition. The particle size ratio causes that when designing the mix ratio of recycled asphalt mixture, the particle size gradation cannot be obtained correctly, the gradat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B18/16
CPCC04B26/26C04B2111/0075C04B14/02C04B14/06C04B18/16C04B18/141Y02W30/91
Inventor 金俊生马永青万军郑志舒伏金勇
Owner 六安市共鑫道路材料有限公司
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