Studies On Electrothermal Properties And Applications Of Textile Reinforced Concrete

In winter, snow and ice on pavement brings a great many inconvenience to transportation. It not only brings menaces to traffic and transportation, but also causes huge economic loss and seriously affects people's lives. So, effective measures is in urgent need to eliminate snow and ice in time at key public places and keep the traffic safe and smooth.Based on the research of conductive concrete, carbon/glass fiber hybrid textile reinforced concrete heating technology is proposed in this paper. Textile reinforced concrete is a relatively new composite material. Carbon/glass fiber hybrid textile not only has obvious effect of strengthening and toughening but also shows excellent electrical conductivity. In this paper, a series of tests and numerical analysis on the electrothermal properties of carbon/glass hybrid textile reinforced concrete have been carried out. The main contents are summarized as follows:(1) Based on the theory of heat transfer, the heating process was attributed to a non-steady-state heat transfer calculation problem. The simplified numerical model was set up under some hypothesis. The simulation of heat conduction was to. obtain the temperature field of the specimen according to the boundary conditions and the governing differential equation.(2) Through the heating experiments under different environmental temperature, thermal layer thickness and input power, the regulation of temperature variation on the top surface of slab were analyzed. The resistance variation during the heating process was observed to analyze the resistance stability. By comparing the temperature rise between the situations with and without thermal isolation layer, the effect of the thermal isolation layer in energy saving has been valued. Numerical simulation results were checked whether according well with experimental datas as well.(3) Small-scale slab heating uniformity experiments were performed under different mesh size and electrical heating power. The results indicate that the textile can generate uniform and stable heat when connected to a power supply. Smaller mesh size and lower electric heating power can increase the heating uniformity. Numerical simulation was also presented to analyze the influencing factors on heating uniformity.(4) Small-scale slab deicing experiments under different circumstance temperature, thickness of ice and heating power were conducted. A large-scale carbon/glass hybrid textile reinforced concrete slab is made for real time snow-melting experiment in the fields. The results verify the feasibility of this technology used for deicing and its significant value for engineering application.