Experimental study on the mechanical properties of steel fiber reinforced expansive concrete

Abstract

— Steel fiber reinforcedexpansive concrete is a new type of building material, which is to add steel fibers into the expansion concrete in order to enhance the bond strength and improve the performances of the concrete. In order to study the influence of the steel fibers and the expansion agent on the mechanical properties of the concrete, steel fiber reinforced expansive concrete specimens were prepared, with the steel fiber volume contents of 0.0%, 0.5%, 1.0%, 1.5% and 2.0% respectively, and the expansive agent mass contents of 0.0%, 0.8%, 1.0%, 1.5% and 2.0% respectively. The mechanical properties of the specimens above were tested tostudy the influences of the contents of the steel fibers and the expansion agent on the compressive strength, the splitting tensile strength, the flexural strength, the impact resistance and the ratio of flexural strength to compression strengthof the concrete.It was showed by the results that the steel fibers can obviously increase the splitting tensile strength, the flexural strength, the impact resistance and the ratio of flexural strength to compression strength of the concrete, yet the expansion agent hardly has any effect on the performance of the concrete. When the steel fiber volume content is within 1%~1.5%, and the expansion agent mass content is within 0.8%~1%, the steel fiber reinforced expansive concrete has the best performance.