Preparation and performance of smart high strength and high ductile concrete

In this study, high strength and high ductility concrete (HSHDC) was developed by mixing carbon fiber (CF) and polyethylene fiber (PE). The mechanical properties and agility of HSHDC were analyzed. The results show that the compressive strength, flexural strength and tensile strain of HSHDC with 0.25vol% CF content were 7% higher than those of control group. The resistivity of HSHDC decreases significantly with the increase of CF content, and the resistivity of HSHDC with 1.0vol%CF content was as low as 10 Ω·m, which was three orders of magnitude lower than that of the control group. With different temperature and relatively humidity conditions, the resistivity of HSHDC mixed with CF showed good stability. Under cyclic loading, the resistivity change rate of HSHDC with 0.25vol%CF content showed a good correspondence with the stress, and the compressive stress and compressive strain sensitivity coefficients reached 0.75%/MPa and 136.5, respectively. For HSHDC with 0.25vol%CF content, the maximum resistivity change rate was 9.2% when the loading amplitude was 15MPa, and the peak resistivity change rate was 7.87% when the loading speed was 0.4 mm/min.