The effect of fiber content on thermal expansion coefficient of carbon fiber reinforced mortar(CFRM) was investigated.Results show that thermal expansion coefficient of CFRM reduces with increasing carbon fiber(CF) content because CF's shrinkage in mortar can restrain the CFRM expansion with increasing temperature.When CF content is less than 1.4%(by mass),the reduction of thermal expansion coefficient is bigger.Compared with control mortar,the thermal expansion coefficient reduces by(21.611 7%) when CF con...