Effect of ceramic fiber on mechanical properties of concrete with different strength grades and its strengthening and toughening behaviors under impact load

Abstract

The mechanical properties of ceramic fiber reinforced concrete (CRFRC) with different strength grades (C30, C50 and C80) under impact load were studied, and the strengthening and toughening behaviors of ceramic fiber on plain concrete were analyzed and compared with that of carbon fiber. The results show that ceramic fiber can improve the mechanical properties of concrete with different strength grades under impact load, and the optimal content of ceramic fiber is 0.2%. Ceramic fiber has strengthening and toughening effect on concrete, and the strengthening and toughening behaviors of ceramic fiber are better than that of carbon fiber. Ceramic fiber has the best strengthening effect on C50 concrete and the best toughening effect on C80 concrete. The dynamic compressive strength (fcd), energy dissipation density (Edd) and dynamic increase factor (DIF) of CRFRC all have strain rate effect. As the ceramic fiber content increases, the strain rate sensitivities of fcd and Edd of CRFRC increase first and then decrease. As the strength grade increases, the strain rate sensitivities of fcd and Edd decrease. The strain rate effect of DIF of CRFRC has a transition strain rate. The transition strain rate of DIF of CRFRC decreases with strength grade and it decreases compared with plain concrete.