Effect of recycled carbon fiber on the electrothermal properties of concrete

Carbon fiber in the production and use of the process will produce a large number of waste materials, the recycled carbon fiber (RCF) into the concrete can reduce the pollution caused by RCF to the environment, but also to achieve a high value of utilization. In this paper, the mechanical properties, electrical conductivity and electro-thermal properties of recycle carbon fiber concrete (RCFC) were investigated under different RCF mixing amounts. The results showed that with the increase of RCF dosage, the compressive strength of RCFC decreased, but the flexural strength slightly increased, while the electrical resistivity decreased significantly, with a maximum decrease of 99.11%. After a certain time of energization, the heat conduction effect of RCFC is significant, and the warming rate increases with the increase of RCF doping and input voltage. When the ambient temperature is 20℃, −10℃ and −30℃, the minimum fiber doping amount that can make RCFC produce electrical and thermal performance is 1.0vol%, 1.5vol% and 2.0vol%, respectively, and the corresponding maximum temperature rise rate is 2.267℃/min, 2.525℃/min and 1.45℃/min, respectively.