Mechanical properties of ceramic fiber-reinforced concrete under quasi-static and dynamic compression: Fid-Bau Portal

Mechanical properties of ceramic fiber-reinforced concrete under quasi-static and dynamic compression

Su, Haoyang / Xu, Jinyu / Ren, Weibo

Highlights • The static mechanical properties of CRFRC increase with fiber volume fraction. • The stress equilibrium and constant strain rate loading were satisfied. • The effect of the axial strain acceleration could be ignored. • The dynamic mechanical properties of CRFRC are sensitive to the strain rate. • The addition of ceramic fiber can improve the mechanical properties of concrete.

Abstract The research herein is made on the quasi-static and dynamic mechanical properties of ceramic fiber reinforced concrete (CRFRC for short) through the adoption of a hydraulically-driven testing system as well as a 100-mm-diameter split Hopkinson pressure bar (SHPB) system. As test results have turned out, such quasi-static properties as compressive strength, splitting tensile strength and flexural strength of CRFRC increase with the rise in the volume fraction of fiber. Within the strain range of 20–120s⁻¹, the effect of the axial strain acceleration on the dynamic strength of CRFRC could be ignored. Therefore, the dynamic increase ratio (DIF) derived from SHPB tests can truly reflect the dynamic enhancement of CRFRC. The dynamic strength, critical strain and specific energy absorption (SEA) of CRFRC are sensitive to the strain rate. The addition of ceramic fiber to plain concrete can significantly improve its properties—dynamic strength, critical strain and energy absorption. And also, an analysis is conducted of the mechanism for strengthening and toughening the concrete.