Study on Quasi-Static Mechanical Property of SFRSCC

Abstract

Steel fiber reinforced self-compacting concrete (SFRSCC) inherits the advantages of self-compacting concrete (SCC) characterized by sound fluidity and self-compaction. Meanwhile, the addition of steel fiber has enhanced the roughness and ductility of substratum. This paper designs SCC of two different strength grades, including C40 and C60, and conducts SFRSCC quasi-static mechanical property test and split tensile test. Uniaxial tensile test is carried out through the design of a dedicated damper to obtain SFRSCC quasi-static uniaxial tensile strength and relational expressions about SFRSCC uniaxial tensile strength and eigenvalue of steel fiber content. It is discovered from SFRSCC split tensile test that, for the concrete with strength grade of C40, its split tensile strength rises by about 36% when the fiber content increases from 0.5% to 2%. For the concrete with strength grade of C60, in addition to the concrete with 1% fiber, the overall variation trend of split tensile strength is the same as that of C40 concrete, but the variation range is relatively small. The damage morphology of specimens indicates that steel fiber can effectively improve the tensile strength and roughness of SFRSCC and help it fully take in the energy before being damaged.