High-temperature anti-rutting modified asphalt and preparation method thereof

Abstract

The invention provides high-temperature anti-rutting modified asphalt and a preparation method thereof. Two kinds of crystalline polymers are used for preparing modified asphalt with the phase changeheat absorption effects. The modified asphalt is concretely prepared from the following raw materials in parts by weight: 65 to 100 parts of substrate asphalt, 0 to 10 parts of polyethylene and 0 to 10 parts of polyethylene glycol, wherein the contents of the polyethylene and the polyethylene glycol cannot be zero at the same time; the polyethylene and the polyethylene glycol are jointly phase change materials; the crystal-amorphous phase change heat suction characteristics are given to the modified asphalt; by changing the relative content of the polyethylene and the polyethylene glycol, thecontrollable regulation of the phase change window temperature of the modified asphalt is realized; the high-temperature sensitivity of the asphalt is reduced; the polyethylene is a framework material, the occurrence of macroscopical deformation during the phase change of the material can be prevented; the high-temperature anti-rutting capability and the rheological stability of the modified asphalt are obviously improved; the service life of the asphalt pavement is effectively prolonged. The preparation method is simple; the control is easy; the raw materials are simple and can be easily obtained; the industrialized production is easy; good application prospects are realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of road engineering materials, and in particular relates to a high-temperature anti-rutting modified asphalt and a preparation method thereof. Background technique [0002] By the end of 2018, my country's expressway mileage had exceeded 140,000 kilometers, ranking first in the world. Asphalt pavement accounts for more than 90% of highway pavement. As a temperature-sensitive viscoelastic material, asphalt has high viscosity at high temperature and is prone to permanent deformation when subjected to a large load. The continuous high temperature caused by global warming, the emergence of channelized traffic, and the continuous long longitudinal slope of mountainous expressways slow down the driving speed and prolong the load action time, resulting in many asphalt pavements appearing rutting, congestion, Problems such as cracks and road subsidence. Among them, the increase of heavy vehicles an...

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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a high-temperature anti-rutting modified asphalt and its preparation method, which solves the problem that existing asphalt materials are easily sticky at high temperatures and easily form ruts. The present invention The asphalt material is endowed with phase change heat absorption characteristics, so that when the external environment temperature rises on the modified asphalt pavement, the polymer undergoes crystallization-amorphous phase transition and absorbs a large amount of heat, which reduces the high temperature sensitivity of asphalt and effectively improves its high temperature resistance. Rutting ability and rheological stability

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