Study On Snow/Ice Melting Performance Of The Novel Induction Heating Asphalt Pavement Composite The Magnetic Conductive Layer

In recent years,functional pavements with self-healing,snow/ice melting,and maintenance effects have attracted more and more attention and research.Among them,pavements with snow/ice melting functions can ensure road traffic safety in winter and significantly improve transportation efficiency under snow/ice weather conditions.At present,induction snow/ice technology was considered to be one of the most promising ways to achieve fast removal of snow/ice.However,induction heating asphalt pavement was originally proposed for pavement self-healing.Therefore,the traditional induction heating asphalt pavement was not the best carrier to achieve the maximum pavement snow/ice melting rate.At the same time,there are also a series of problems such as high construction cost,which limits Large-scale promotion and application of induction snow/ice melting technology.This paper uses two kinds of waste materials to design a novel type of induction asphalt pavement composite magnetic conductive layer pavement structure to quickly melt the snow/ice accumulated on the pavement.Firstly,systematic testing and analysis of its pavement performance and structural stability were carried out,and then the novel pavement structure induction heating performance tests and snow/ice melting performance tests were conducted.Finally,a comprehensive economic and environmental performance evaluation of the novel pavement structure was conducted.Through the above research and analysis,the following conclusions are obtained:The material composition and design method of the novel pavement structure was proposed,and the AC-13 asphalt mixture design was carried out.The optimal asphalt content of the induction asphalt mixture and the magnetically conductive asphalt mixture was determined to be 4.42%.Adding 6% waste steel shavings as the inductive medium to the inductive surface layer can significantly improve the pavement performance of the mixture.Choosing a magnetically conductive asphalt mixture to replace coarse aggregates to form a magnetically induced layer would reduce the pavement performance to a certain extent,but it is still within an acceptable range.In addition,the test results of interlaminar shear strength and dynamic stability prove the feasibility and rationality of the new pavement structure.Induction heating performance test results show that the different thickness of the magnetic conductive layer directly leads to different heating effects.The thicker the thickness of the magnetic conductive layer,the better the heating effect of the inductive surface layer.When the thickness of the magnetic conductive layer was 3cm,compared to the control group,the efficiency of induction heating has almost doubled.The snow/ice melting performance test results show that the snow/ice melting rate has nothing to do with the thickness of the ice/snow layer.Under the action of the magnetic conductive layer,the maximum snow/ice melting rate can reach 26.25g/min and24.13g/min,respectively.The lower the ambient temperature and the thicker the ice/snow layer,the lower the corresponding snow/ice melting rate.Under lower ambient temperature and thicker ice/snow layer,it is recommended to adopt a combined deicing method to completely remove the snow/ice on the pavement.In this paper,when the ambient temperature is below-10°C,and the thickness of the snow/ice layer is greater than 5cm,first use an ice shovel/snow shovel to remove the thick ice and snow,and then perform induction heating to melt the thin snow/ice on the pavement surface.The comprehensive economic and environmental protection evaluation index λ was proposed,and the higher λ represents the better the economic and environmental benefits bring by the novel pavement structure.When the thickness of the magnetic conductive layer was 3cm,2cm,and 1cm,the calculated results of λ were 0.44,0.41,and 0.39,respectively.Thus,it is recommended to use a 2cm inductive surface layer +3cm magnetic conductive layer as the best novel pavement structure combination.The novel pavement structure proposed in this paper has good pavement performance and high structural stability.At the same time,the snow/ice melting rate is very fast,which has strong economic and environmental protection value.Thus,it can be popularized and applied on a large scale to achieve the purpose of fast removal of ice and snow.