Carbon Nanotube Based Self-sensing Concrete for Pavement Structural Health Monitoring

This research project developed self-sensing carbon-nanotube (CNT)/cement composites. The piezoresitive property of carbon nanotubes enables the composite to detect the stress/stain inside the pavement. Meanwhile, CNTs can also work as the reinforcement elements to improve the strength and toughness of the concrete pavement. Experimental results show that the electrical resistance of the composite changed proportionally to the compressive stress levels. The piezoresistive responses of the composite with different fabrication methods are also studied. Lab tests and road tests were performed to test the self-sensing concrete. Controlled dynamical loads were applied on the sensors. Experimental results demonstrated that the CNT/cement composite function as excellent stress/strain sensors.