Method for preparing phase change asphalt pavement material

Abstract

The invention relates to a preparation method for phase-change asphalt pavement material and is characterized in that the method comprises the following steps: (1), the preparation of phase-change asphalt modifier: firstly, selecting the materials based on the mass ratio among phase change material, coagulant, support material and coupling agent which is equal to 100:1-5:10-50:1-5; secondly, adding the phase change material into the silica sol, and then adding the coagulant dropwise to form gel; drying the gel, cooling the gel to room temperature and then taking out and mashing the gel to get powder through mixing; vacuuming the powder at 30-50 DEG C for 2-4 hours, then adding the support material under the protection of shielding gas; at 80-100 DEG C, adding the coupling agent for hydrophobic modification; then granulating to get the phase-change asphalt modifier; (2), the preparation of phase-change asphalt pavement material: firstly, selecting the materials based on the mass ratio among coarse aggregate: fine aggregate: filler, asphalt, fiber and phase change asphalt modifier which is equal to 100:10-20:1-8:2-6:0.2-0.5:2-10; then stirring the materials to get the phase-change asphalt pavement material. The phase-change asphalt pavement material prepared through the invention can improve the high temperature stability of pavement surface.

Description

Technical field [0001] The invention relates to a preparation method of a phase change asphalt pavement material. technical background [0002] Asphalt concrete is a viscoelastic material, and its physical and mechanical properties are closely related to temperature and load time. During use, asphalt pavements are subjected to different environmental conditions from low temperature to high temperature. The "high temperature" conditions commonly referred to as "high temperature stability" refer to the temperature range within which permanent deformations (including oil flooding) such as rutting, shifting, and congestion are prone to repeated action by traffic loads during use. The practice of road use shows that under normal vehicle load conditions, the permanent deformation is mainly when the summer temperature is above 25, that is, the road surface temperature of the asphalt pavement reaches 40~70℃, which has reached or exceeded the softening point temperature of the road asphal...

AI Technical Summary

Problems solved by technology

The existence of rutting reduces the performance of the pavement and endangers driving safety, thereby shortening the service life of the asphalt pavement; the rutting of the expressway is one of the most harmful forms of damage to the asphalt pavement

In addition, during the paving process of the steel box girder, the asphalt mixture will be pushed and crowded under high temperature conditions, which will seriously affect the road surface and construction effect

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