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A preparation method of recycled aggregate asphalt concrete and its application in asphalt pavement

A technology for asphalt concrete and recycled aggregates, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of high water absorption rate of aggregates, increasing the optimal oil-to-stone ratio of the mixture, and difficult to remove, etc. Achieve the effect of improving utilization, increasing application scope and fields, and improving performance

Inactive Publication Date: 2016-04-20
湖南湘通公路桥梁建设有限公司
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Problems solved by technology

[0004] At present, the application of recycled aggregates to asphalt concrete pavement mainly has the following disadvantages: Due to the secondary utilization of aggregates, some mortar is attached to the surface, resulting in high water absorption of aggregates, which will increase the optimal performance of the mixture to a certain extent. Oil-stone ratio
[0005] The sources of recycled aggregates are different, and the various impurities in waste are different, and it is difficult to completely remove them with the current production technology, which has a certain impact on the performance of recycled aggregate asphalt concrete. The main influencing factors are the brick content

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  • A preparation method of recycled aggregate asphalt concrete and its application in asphalt pavement

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Embodiment Construction

[0020] The method provided by the invention utilizes recycled aggregates to prepare asphalt concrete, and its technological process is as follows figure 1 Shown now in conjunction with accompanying drawing (table) this patent is described further, but the present invention is not limited to following embodiment.

[0021] Take the preparation of densely graded AC-16 asphalt mixture as an example.

[0022] 1. Test materials:

[0023] Asphalt: CNOOC 70# ordinary base asphalt, its quality conforms to "Technical Specifications for Construction of Highway Asphalt Pavement" (JTGF40---2004);

[0024] Aggregate: Natural aggregate is the crushed stone obtained by crushing limestone, and the parent rock including mineral powder is also limestone. Recycled aggregates are processed from broken foundations of old buildings in the 1980s. Both natural aggregate and recycled aggregate adopt the same particle size classification standard, the maximum particle size is 19mm, and the nominal pa...

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Abstract

The invention relates to a method for preparing asphalt concrete with recycled aggregate and application of the asphalt concrete in an asphalt pavement and belongs to the technical field of recycled aggregate concrete. The method comprises the following steps: selecting recycled coarse aggregate; replacing part of coarse aggregate with the recycled coarse aggregate; mixing the other part of the coarse aggregate, the recycled coarse aggregate, fine aggregate and natural mineral powder to form mixed aggregate; heating the mixed aggregate; then mixing the mixed aggregate with hot asphalt uniformly. In the application of the asphalt concrete in the asphalt pavement, rolling times are increased. Generally, the number of the total rolling times is 10-12. According to the method, the application range and the application field of the recycled aggregate are broadened greatly, and the utilization rate of the recycled aggregate is improved fully.

Description

technical field [0001] The purpose of the present invention is to provide a method for preparing recycled aggregate asphalt concrete, and apply it to asphalt pavement, which is suitable for the recycling of construction solid waste and the paving of different grades of asphalt pavement, and belongs to recycled aggregate field of concrete technology. technical background [0002] Recycled aggregate asphalt concrete pavement is the reprocessing of construction solid waste, and it is added to asphalt concrete in a certain proportion, so that it can replace part of the natural coarse aggregate and become the main skeleton in the mixture. Its blending ratio can be appropriately controlled according to engineering requirements. [0003] The production and utilization of recycled concrete aggregate can organically combine the development of the construction industry and building materials industry with the protection of the ecological environment and the control of environmental p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26C04B18/16
CPCY02W30/91
Inventor 邓宗才张戊晨
Owner 湖南湘通公路桥梁建设有限公司
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