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Intrinsic self-sensing cementitious composites are competitive candidates for structural health monitoring of smart civil infrastructure. Meanwhile, the hybrid nanofillers can endow cementitious composites with excellent piezoresistivity with a synergetic effect due to their various aspect ratios and particle shapes. Hence, this study presents a comprehensive investigation of intrinsic self-sensing cementitious composites containing graphene nanoplatelets, carbon nanotubes, and nanocarbon blacks (GCNs). The electrical conductivity, mechanical performances, and self-sensing properties subjected to cyclic and monotonic compression were studied. The parameters include concentration of the GCNs, water content, and ages. Mechanisms of the properties affected by the GCNs were explored in depth. The results indicate that the electrical resistivity decreased rapidly as dosages of the GCNs increasing from 4.0 to 10.0 wt%. The maximum compressive strength was reached up to 45.3 MPa under the concentration of GCNs of 2.0 wt%. Moreover, the optimum FCR and stress/strain sensitivity were −24.9 and 1.0%/MPa/95.8, respectively, corresponding to the content of the GCNs of 10.0 wt%, which were improved by 54.3% and 5,050.0%/4,360.1%, respectively, compared with the control group. This research can offer a theoretical foundation for promoting the application of intrinsic self-sensing cementitious composites toward structural health monitoring in smart infrastructure.

Intrinsic self-sensing cementitious composites with hybrid nanofillers exhibiting excellent piezoresistivity