Permeable asphalt mixture and preparation method thereof

Abstract

The invention relates to the field of pavement asphalt materials, and particularly discloses a permeable asphalt mixture and a preparation method thereof. The invention relates to a permeable asphalt mixture, which is prepared from the following raw materials in parts by weight: 4.3 to 6 parts of asphalt, 78 to 90 parts of recycled coarse aggregate, 19 to 31 parts of recycled fine aggregate, 3 to 5 parts of mineral powder, 0.1 to 0.3 part of reinforced fiber and 0.516 to 0.72 part of high-viscosity modifier, the recycled coarse aggregate is obtained by crushing, acidifying and carbonizing waste concrete. The permeable asphalt mixture can be used for permeable pavements, and has the advantages of good water permeability, good water damage resistance, high strength, large bearing capacity and good high temperature resistance.

Description

technical field [0001] The application relates to the field of pavement asphalt materials, more specifically, it relates to a permeable asphalt mixture and a preparation method thereof. Background technique [0002] Asphalt pavement refers to the road surface formed by paving and compacting asphalt mixture. The material for paving asphalt pavement is called asphalt mixture or asphalt concrete, which is a mixture formed by fully mixing asphalt material with a certain viscosity and an appropriate amount and a certain grade of mineral aggregate. Among them, permeable asphalt mixture, as a kind of open-graded asphalt mixture with interconnected pores, can form a pavement surface layer with a porosity of about 15-25% after compaction when paving the road surface, which has a good Water permeability has played a huge role in solving the problem of poor drainage of urban roads. [0003] In order to form a larger void ratio, the permeable asphalt mixture usually contains a higher ...

AI Technical Summary

Problems solved by technology

However, ordinary concrete is made of cement as the cementitious material and mixed with water. The above method can improve the workability of recycled aggregate in cement concrete materials, but it will obviously reduce the adhesion between it and asphalt. cohesion

[0005]In addition, in order to ensure the porosity of permeable asphalt, the proportion of coarse aggregate is usually relatively large, which leads to a small total specific surface area of ​​the asphalt mixture, and the aggregate The asphalt film on the surface is relatively thin, which requires the asphalt in the permeable asphalt mixture to have a better wrapping force on the aggregate. However, the recycled aggregate treated by the traditional method will reduce the wrapping force of the asphalt on the aggregate and affect the asphalt mixture. performance

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