Thermal-resistance characteristics of carbon fiber reinforced cement-based composites

An introduction was given to the methods for preparation of the carbon fiber reinforced cement-based composites(CFRC) and its electrical resistivity testing.The relationship between the electrical resistivity and temperature of CFRC at different mixing ratios of carbon fiber was studied.The result shows that CFRC is of certain thermal-resistance characteristics,and its electrical resistivity decreases with the increase of the temperature at the initial stage of temperature rise,demonstrating NTC effect of the test samples,and that the electrical resistivity increases with the rise of the temperature as the temperature rises to a certain value,demonstrating PTC effect of the test samples.It is also indicated that,with the variation of the mixing ratio of carbon fiber,the NTC/PTC transition temperature will also change.Moreover,the mechanism of transition of NTC/PTC effect was also discussed based on the experimental results.