Experimental Study On Performance Of Asphalt Concrete Under Sodium Chloride Corrosion

Asphalt pavement is a kind of structure that widely used in cities and highways in recent years, to keep city and highway smooth traffic and safety in winter snow is a major event can not be ignored,So spray chlorine snowmelt agent is a widely used method in snowmelt deicing. But the chlorine snowmelt agent is the "double-edged sword": on one hand, use them can solve the traffic and safety issues in snow day immediately, alleviate traffic pressure after snow days, On the other hand, most snowmelt agent has strong corrosive, severe damage to the concrete pavement, which is greatly affects the use function of the highway. With widely used of chlorine snowmelt agent, the corrosion of asphalt pavement structure layer is increasingly seriously, has developed into a "salinity injuey".This paper mainly represented by sodium chloride, etching asphalt concrete by using the method of soaking specimens in laboratory, combining various performance evaluation indexes, comparison and analysis the changes of the mechanical characteristics and the use function of the highway of asphalt concrete, which is etching by different concentrations of chlorine .discuss the general rule of the performance of asphalt concrete what is etching by different concentrations of chlorine.First, for the performance requirements to material of the pavement structure layer, combined with the characteristics of ShiJi highway region, relying on the premise of local raw materials to design the mix of asphalt concrete, according to the various volume index measured by rotate compaction test, and finally to determine gradation type AC-20C, the best oil-stone ratio was 4.0%.Secondly, through the bend destructive testing under 0℃conditions and fracturing experiment under -10℃, this paper analyses the change rule of low temperature cracking resistance of asphalt concrete what is etching by different concentrations of chlorine.Finally, comparison and analysis the mechanical characteristics of asphalt concrete what is etching by different concentrations of chlorine through the uniaxial compression static load creep tests, using the Burgers rheological model parameters fitting the results of its tests to further investigate the influence degree and the change rule of creep characteristics of asphalt concrete what is etching by chlorine .