Modified asphalt concrete and its preparation method and construction method

Abstract

The invention discloses a modified bituminous concrete and a preparation and construction method thereof. The modified bituminous concrete is composed of, by weight part, 350-400 parts of coarse aggregate, 70-100 parts of fine aggregate, 30-35 parts of asphalt, 40-50 parts of filler, 1-3 parts of wood fiber, 3-5 parts of glass fiber, 2-4 parts of chitosan and 0.5-2 parts of polyoxythylene. The preparation method of the modified bituminous concrete comprises, firstly, processing, drying and then preheating the coarse aggregate, the fine aggregate and the filler to 170 DEG C, and heating the asphalt to 160 DEG C; secondly, mixing and stirring the glass fiber into the mixture obtained in the first step for 25-35 seconds, then adding in liquid asphalt for stirring for 80-100 seconds, and then adding in the wood fiber and the chitosan for stirring for 100-120 seconds to obtain the modified bituminous concrete in a loose state; lastly, performing shaping through a roll-forming method. The modified bituminous concrete can maintain good temperature resistance at high or low temperature to effectively avoid asphalt volatilization at high temperature as well as concrete cracking at low temperature, prolong the service life of concrete and facilitate preparation.

Description

Technical field [0001] The invention relates to a concrete, more specifically, it relates to a modified asphalt concrete. Background technique [0002] With the rapid development of high-grade highway construction in my country, the development of asphalt pavement has become inevitable. This is mainly because asphalt pavement has many advantages compared with cement pavement: such as smooth surface, comfortable driving, low vibration, low noise, and construction period. Short, easy to maintain and repair, suitable for phased construction, etc. But the early damage is also very serious: problems such as potholes, oil flooding, pumping, rolling, packing, washboard, rutting, etc., especially the rutting problem of high temperature stability, especially in the southern region. [0003] The Chinese patent with application number CN201210317807.9 discloses a crack self-healing asphalt concrete, which includes coarse aggregate, fine aggregate, filler and asphalt, rigid fiber and flexible ...

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent with the application number CN201310513266.1 discloses a modified asphalt concrete with the function of cooling and reducing emissions, which is made of the following raw materials in parts by weight: 100 parts of ore, 4 to 8 parts of asphalt, 0.5 to 2.4 parts of iron ore powder parts, 0.01-0.05 parts of coupling agent; the iron ore powder is magnetite powder or / and maghemite powder, the coupling agent is a silane coupling agent, and the gradation type of the mineral material is AC -13 type, although this kind of modified asphalt concrete has the function of reducing emission and cooling, it can reduce the emission of pollutant gas during the mixing and paving process, and can reduce the temperature of the road surface in the summer high temperature season, but it does not involve low temperature resistance Modification of asphalt concrete