Asphalt mixture capable of resisting water damage and preparation method of asphalt mixture

Abstract

The invention provides asphalt concrete capable of resisting water damage. The asphalt concrete is prepared from 85 to 90 weight percent of aggregate, 4 to 6 weight percent of SBS modified asphalt, 0 to 2 weight percent of polysiloxane powder, 0 to 2 weight percent of talcum powder, 0 to 5 weight percent of 3-(methylacryloyloxy)propyltrimethoxysilane and 0 to 2 weight percent of white carbon black. According to the invention, the 3-(methacryloyloxy)propyltrimethoxysilane can improve the bonding strength of asphalt and aggregate and resist the erosion of water; the white carbon black has better dispersity, so the uniformity of the coating thickness of the suspension on the surface of the aggregate can be improved, and performance difference caused by non-uniform thickness is avoided; and the polysiloxane powder has good bonding strength with asphalt, has strong hydrophobicity, can repel erosion of water to an asphalt-aggregate interface, and can effectively solve the problem of water damage to asphalt concrete. The invention also provides a preparation method of the asphalt concrete capable of resisting water damage.

Description

technical field [0001] The invention belongs to the technical field of highway engineering, in particular to an asphalt mixture resistant to water damage and a preparation method thereof. Background technique [0002] Water damage to asphalt concrete is a common disease. After asphalt concrete pavement is built, under the action of traffic load and environmental load, certain microcracks will appear on the pavement; At the interface of aggregates, under the action of traffic load and dynamic water pressure, high velocity water flow and high pore water pressure cause the asphalt film to fall off (peel off) from the surface of the aggregate, and the asphalt concrete will appear grain falling, loose and other diseases, and then form Asphalt concrete pavement water damages potholes, so that the performance of the entire pavement structure decays rapidly; water damage to asphalt concrete can also induce and promote other diseases of the subgrade pavement, such as rutting, cracks,...

AI Technical Summary

Problems solved by technology

[0003] There are generally two methods for improving the water damage resistance of asphalt concrete in the prior art: one is to use modified asphalt, such as SBS modified asphalt and rubber modified asphalt; the other is to improve the construction quality of asphalt concrete, increase the degree of compaction, and reduce porosity However, under the action of traffic load and environmental factors, various cracks will inevitably appear on the asphalt pavement. It is inevitable that water will penetrate into the interior of the asphalt concrete through the cracks and cause water damage. The difference is whether the water damage occurs sooner or later.

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