ABSTRACT
Steel fiber reinforced expansive concrete is a new building material, which adds the steel fibers into the expansion concrete to enhance the bond strength and improve the performance of the concrete. 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 being 0.0%, 0.5%, 1.0%, 1.5%, and 2.0% respectively, and the expansive agent mass contents being 0.0%, 0.8%, 1.0%, 1.5%, and 2.0% correspondingly. The mechanical properties of the specimens above were tested to reveal 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 strength of the concrete. It was shown by the results that all these properties can be improved by the steel fibers 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.
