Smart properties of carbon fiber reinforced cement-based composites

In this study carbon fiber reinforced cement-based composites (CFRC) are fabricated by compressing, and the smart properties of the composites are studied. The results show that there exists a remarkable negative temperature coefficient (NTC) and a positive temperature coefficient (PTC) in the composite. The resistivities of the composites formed under 10MPa are more sensitive to temperature than that of the composites formed under 2 MPa, and the critical temperature zone of the composites formed under 10 MPa (100-130 degrees C) is narrower than that of the composites formed under 2 MPa (50-100 degrees C). The fractional change in resistance of CFRC shows obvious one-to-one correspondence with cyclic load. The amplitude of the fractional change in resistance of the composites formed under 10 MPa is obviously larger than that of the composites formed under 2 MPa, which is more suitable for the application of important buildings such as bridges, dams, and so on to realize the real-time, dynamic and health monitoring, and damnification evaluation.