A high-efficiency recycled asphalt mixture and its preparation process

Abstract

The invention discloses a high-efficiency recycled asphalt mixture, which comprises 1.0 to 3.0 parts by mass of recycled special asphalt and 100 parts of aggregate; the 100 parts of aggregate contain raw materials with the following mass ratio: the particle size is 0-30 parts of new aggregate with a particle size of 10mm-25mm, 0-70 parts of RAP material with a particle size of 10mm-20mm, 0-80 parts of RAP material with a particle size of 5mm-10mm, and 0 parts of RAP material with a particle size of 0mm-5mm ~20 parts, mineral powder 0~3 parts. The invention also provides a preparation process of high-efficiency recycled asphalt mixture. In the finished high-efficiency recycled asphalt mixture of the present invention, the admixture ratio of RAP material can reach more than 70%, the highest can be fully recycled plant mixing, and can be applied to various road surface grades.

Description

technical field [0001] The invention relates to an asphalt mixture, in particular to a high-efficiency asphalt recycled mixture and a preparation process thereof. Background technique [0002] The development of my country's highways is shifting from both construction and maintenance to the era of maintenance. Road maintenance produces hundreds of millions of cubic meters of waste materials every year, which need to be disposed and utilized, causing huge pressure on the ecological environment. If the waste materials are discarded as landfill, it will take up a huge storage space. If the waste asphalt mixture is simply mechanically treated as a roadbed cushion, the function of the waste asphalt mixture cannot be fully utilized, resulting in a serious waste of resources. Therefore, recycling this waste material for reuse will save a lot of cost and has important economic and social value. [0003] The implementation process of asphalt pavement regeneration technology is that...

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Problems solved by technology

[0005] Researchers at home and abroad have carried out a lot of research on the design and construction technology of recycled mixtures, and obtained corresponding research results. However, due to the differences in test materials and test equipment used by researchers, the research conclusions are not uniform or even contradictory. At the same time, due to unrefined test and design methods, the amount of old materials in the designed hot recycled mixture is low, the effective regeneration rate of old materials is low, the required addition of new asphalt or regenerant content is high, and the quality of the recycled mixture is unstable. , the road performance of the recycled mixture is poor, which reduces the economic advantages of the recycled mixture and seriously affects the industrialization and large-scale implementation of thermal regeneration technology

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