Analysis The Influence Of Snow Melting De-icing Agent On Mechanical Parameters Of Asphalt Mixture

In the cold winter,snow and ice will appear in most parts of China,especially in the northern mountainous sections,and the disasters of snow and ice will seriously affect road traffic safety.In order to ensure the safety of the road,the problem of snow and ice on the road is generally solved by means of spreading snow melting agent.Spraying snow-melting agent can greatly improve the efficiency of snow-clearing,and the harm brought by it cannot be ignored.Many road researchers have found that the chloride salt snow melting agent widely used in road melting and snow removal is not only corrosive to the road material itself,but also has a great adverse influence on the auxiliary facilities of the road and the surrounding environment.Therefore,through R&D,three kinds of organic snow-melting agents with less impact on road accessory facilities and surrounding environment and better snow-melting effect were obtained.In order to further verify the environmental protection of the three snow melting agents,this paper studies the effect of snow melting agent on the mechanical properties of asphalt mixture by the phenomenon that the corrosion of the asphalt mixture will cause the attenuation of the mechanical parameters of the asphalt mixture.The three organic and environment-friendly snowmelt agents are respectively named ZM-1,ZM-2 and ZM-3.In order to study the influence of the above three kinds of snow melting agents on the physical and mechanical parameters such as mass,void ratio,Marshall stability,splitting strength,compressive strength and compressive rebound modulus,and the pure water environment and the chlorine salt snowmelt agent distributed on the project site were used as the reference,and the corrosion prediction test,the orthogonal test of dry-wet cycle,the freeze-thaw cycle test and so on were used to carry out the research.By comparing the attenuation degree of mechanical parameters of asphalt mixture under the corrosive environment of original,pure water and four kinds of snow-melting agents,the effects of four kinds of snow-melting agents on the mechanical properties of asphalt mixture were qualitatively and quantitatively evaluated.(1)By analyzing the results of the orthogonal test of dry and wet cycle and freeze-thaw cycle test,it was found that the physical and mechanical parameters of asphalt mixtures corroded by snow-melting agent have attenuated to varying degrees.Comparing the attenuation degree of mechanical parameters synthetically,it is found that the damage of ZM-2 snow-melting agent to mechanical parameters of asphalt mixture is roughly in the moderate degree.Therefore,according to the principle that the comprehensive effect of snow-melting agent on mechanical properties of asphalt mixture is relatively small,it is concluded that ZM-2 snow-melting agent is relatively optimal.(2)Based on the preliminary evaluation test of the corrosiveness of snow-melting agent,the indirect tensile failure and uniaxial compressive failure stress-strain characteristics of asphalt mixtures before and after dry-wet cycles of pure water and four kinds of snow-melting agents were compared and analyzed.Secondly,the model of snow melting agent corrosion and load-bearing damage of asphalt mixtures based on stress-strain characteristics is deduced.(3)By means of ultrasonic detection and acoustic emission technology,the acoustic characteristics of the asphalt mixture before and after corrosion by pure water and four kinds of snow melting agents were compared.Simultaneously,based on the cumulative ringing count parameters of acoustic emission,the model of snow melting agent corrosion and load-bearing damage of asphalt mixtures based on acoustic emission characteristic parameters is obtained.