Abstract
The influence of steel fiber on the mechanical properties of ultra-high performance concrete (UHPC) were studied through slump, compressive strength, flexural strength test. The experimental results showed that the incorporation of steel fiber had an influence on the working performance of UHPC, and the slump and expansion degree of UHPC were inversely proportional to the volume content and length-diameter ratio of steel fiber. The steel fiber significantly improved the compressive and flexural strength of UHPC. The mechanical property of UHPC was the best when the steel fiber content was 4%, with 28 day compressive strength up to 163.2MPa and flexural strength up to 45.9MPa. UHPC showed a trend of gradual decrease of compressive strength and gradual increase of flexural strength with the increase of aspect ratio of steel fiber on the condition of constant volume content of steel fiber. The addition of special-shaped steel fiber can improve the compressive and flexural strength of UHPC effectively.
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