Deicing And Melting Snow Study On The Concrete Pavement Covered With The Lightweight Aggregate Conductive Concrete

The heavy snow and icy condition in winter is a very common problem existed in highway maintenance, and the environmental pollution has been paid more attentions during these years. The bad climate environment is getting worse and worse, it is a wake-up call of the natural world. Deicing salt and snow broth are frequently used in the road of northern region in winter, it makes huge bad influence to the plant, reinforced concrete roads and bridges and so on. In this case, many kind of economic, energy reducing, environment protecting, safe, reliable methods for melting snow and deicing have been developed, heating method attracted more attention.In this paper, the deicing and melting snow system by using electric heating aggregate conductive concrete is studied, and using the finite element analysis software ANSYS analyses the temperature distribution of pavement structure. The mainly research projects include the temperature rising regulation, stability of aggregate conductive concrete, and efficiency of deicing and snow-melting. The feasibility of deicing in different environmental conditions or using different electric power is studied. The results from test and calculation are in good agreement each other, which indicate that the finite element model established is correct. Based on the studies above, a new intelligent energy-saving controlling system is introduced. The main conclusion is:1) As the thickness of the ice on the pavement is no more than 3mm and the ambient temperature are -10℃～-5℃,-15℃～-10℃, and -20℃～-15℃respectively, to meet the basic requirements of deicing, the electric power should be no less than 400W/m2,500W/m2,600W/m2 respectively.2) Compared the temperature rising regulation and deicing efficiency between carbon fiber grid and the aggregate conductive concrete, the result shows the electrical resistance of them is stable, and the carbon fiber grid is worked, by the same electric power has a faster heating.3) Through the conductive concrete slab in the outdoor experiment, using 300 w/m2 electric power, the result shows that the structure to maintain the surface temperature of 2～3℃can achieve the requirement real-time of snow-melting.4) Using the finite element analysis software ANSYS analyses the temperature distribution of pavement structure. The mainly research projects include the temperature rising regulation, stability of aggregate conductive concrete, and efficiency of deicing and snow-melting. The results from test and calculation are in good agreement each other, which indicate that the finite element model established is correct, and it can forecast the time which reach the specified temperature.5) Simulated some different structural style of pavement structure, such as whether with insulation layer or not, sets a layer of the common concrete or asphalt concrete covered with aggregate concrete layer. There are several major factors the material of insulation layer, the thickness of conductive concrete and thermal conductivity, which influence the temperature distribution of pavement structure. Therefore, by means of a variety of materials modeling and structural design, design a low-cost, superior performance pavement satisfied for the requirement of deicing and melting snow.This research has an important practical significance to the lightweight aggregate concrete pavement structure design and material selection. These kinds of deicing and melting snow method are conducive to the smooth and safety traffic in winter, and reduce the deicing salt using which bring the negative environmental impact.