Smart ultra-high-performance concrete under cyclic high compressive stress

The self-stress sensing response of smart ultra-high-performance concrete (S-UHPC) under high cyclic compressive stress was investigated at different temperatures between 15 and 35 °C as a basic study for understanding the effects of temperature on the self-stress sensing response of S-UHPC. The S-UHPC has maintained the quasi-linear relationship between stress and fractional change in electrical resistivity (FCR) even under cyclic stress. The stress-sensing coefficient (SSC) of S-UHPC almost linearly decreased from 0.2450 to 0.1722%/MPa with increasing the temperature from 15 to 35 °C. The lower SSC at higher temperature is based on the decreased electrical resistivity (∆ρ) of S-UHPCs owing to more activated ion movements in S-UHPCs.