Research On Electrothermal Properties Of Carbon/Glass Fiber Geogrid Reinforced Asphalt Concrete

The current rapid development of road traffic in our country has played an important role in Chinese economic construction. But the snow seriously affects the road unobstructed and the safety of driving. Snow melting and deicing of highway, airport runway and tunnel entrance is more important. The traditional artificial and mechanical snow removal and snowmelt agent are effective, but bring a lot of problems, such as high maintenance cost, environmental pollution, steel corrosion and so on. Therefore, in order to ensure the road unobstructed, a new way of snow removal method is needed.Based on the research of geogrid and snow melting and deicing, this paper proposes a way for snow melting and deicing by using carbon/glass fiber geogrid reinforced asphalt concrete. Carbon/glass fiber geogrid can effectively enhance the asphalt pavement anti-rutting capability. And carbon fiber shows good physicochemical stability and excellent electrical conductivity. In this paper, a series of tests and numerical analysis on the electrothermal properties of carbon/glass fiber geogrid reinforced asphalt concrete have been carried out. The main contents and conclusions are summarized as follows:(1) Based on the theory of heat transfer, the mathematical model of carbon/glass fiber geogrid reinforced asphalt concrete for snow melting and deicing is carried out. According to the boundary conditions, ANSYS is used to simulate the heat-transfer process of carbon/glass fiber geogrid reinforced asphalt concrete to know the phase change process and the temperature distribution in the asphalt concrete.(2) The results of numerical simulation show that the ice temperature curve is divided into three stages. The first stage is the endothermic process of ice. The temperature increases linearly. The second stage is the phase change process of ice. The temperature rises slowly. The third stage is the endothermic process of water. The deicing experiments under different thermal conductivity of asphalt concrete is simulated by ANSYS finite element software. The results show that the thermal conductivity of asphalt concrete does not have a great impact on the efficiency of the deicing.(3) Through the heating experiments of carbon/glass fiber geogrid reinforced asphalt concrete slab under the different environment temperatures, the different wind speed, the different heating power and the different thicknesses of ice, the regulation of temperature variation on the top surface of slab are analysed. The results show that the lower the environment temperature is, the higher the wind speed is and the thicker the ice is, the lower the deicing efficiency is. The deicing efficiency can be adjusted by controlling the heating power.(4) The comparison between the experimental values and the numerical values shows that the experimental values coincide with the numerical values on the first and the second stage. As the phase change time is longer, the difference is greater on the third stage.(5) The results of the heating uniformity experiments show that the pavement interior temperature difference is stable. Considering the initial temperature difference, the heating uniformity of carbon fiber is very good. The rising rate of the edge temperature is lower than that of the road surface, it means that the loss of heat is very little. The temperature curve of the road surface almost increases linearly. The outdoor snow melting experiment achieves the desired results. And it verified the practicality of snow melting and deicing with the carbon/glass fiber geogrid reinforced asphalt concrete.