Study On The Selection Of Snowmelt Agent And Its Influence On The Performance Of Asphalt Concrete

At present,distributing snow melt agent is still a mainstream method in snow removal operations in northeast China,and there are many kinds of snow melt agents,so the influence on asphalt pavement and snow removal ability are unknown.In the actual operation of removing snow and ice,the amount of snow melting agent is mostly determined by experience.Although relevant regulations indicate the amount of snow melting agent per square meter,it can't achieve the expected effect of snow melting and ice melting due to various factors.In the domestic and foreign research on the amount of snowmelt agent,all kinds of working conditions and road environment in the use of snowmelt agent are simulated,and the corresponding prediction model or the amount of snowmelt agent in a single environment are put forward.However,the conversion of the amount of indoor and outdoor snowmelt agent is rarely mentioned.Therefore,it is of great significance to rationally select the types of snow melting agents,determine the conversion ratio of indoor and carry out the research on the performance of asphalt mixture under the action of salt freeze-thaw cycle to curb the abuse of snow melting agents and reduce the damage to asphalt pavement.In this paper,AC-13 asphalt mixture commonly used on asphalt pavement is used to evaluate the snowmelt agents,and the applicable scope of snowmelt agents and the selection scheme of snowmelt agents under different conditions are proposed.Then the snowmelt agent was distributed under the same condition by indoor and outdoor test,and its conversion amount was determined.Finally,the variation law of road performance and its indexes of asphalt mixture in the salt freezing-thawing environment is studied.The research results of this paper are as follows:(1)Because of its low freezing point,magnesium chloride snow melting agent is more suitable for snow removal on icy roads in cold regions;(2)In northeast China,it is recommended to use sodium chloride snowmelt agent as the first choice for snow melt and ice removal on normal trunk roads.Magnesium chloride snowmelt agent is used in sections that urgently need to deal with snow and ice as soon as possible;(3)It is determined that the amount of actual road thawing agent is about 2.5 times of the amount of laboratory test;(4)In the salt freezing-thawing environment,the type,concentration and number of freezing-thawing cycles of snowmelt agent have adverse effects on the road performance of asphalt mixture,number of freeze-thaw cycles>types of snowmelt agents>snowmelt agent concentration.