Microcosmic and smart properties of carbon f iber cement-based composites

Portland cement and carbon fiber were used to fabricate carbon fiber reinforced cement-based composites(CFRC) by compressing. The microcosmic properties were analyzed by SEM and Poremaster Analyzer , and thesmart properties were also studied. The result s show that the porosities of the specimens formed under larger pressures are obviously lower than those of the specimens formed under smaller pressures. With the temperatureincreasing , the resistivities of the composites formed under different pressures show the t rend of increase anddecrease. The critical temperature zones of the specimens formed under the smaller and the larger pressures arebetween 75～100 ℃and 100～120 ℃, respectively. Under the low cyclic load , the f ractional change in resistivity ofCFRC changes reversibly with the cyclic load. The amplitude of the f ractional change in resistance of the compositesformed under the larger pressure is obviously larger than that of the composites formed under the smaller pressure ,which is more suitable for the real-time , dynamic and health monitoring and damage assessment of st ructures.