Abstract
Flexural toughness tests are performed to investigate the influence of hybrid fibers on the toughness of reactive powder concrete (RPC). The experiment uses different amounts of high-strength steel fibers and macro-polyolefin or micro-polyvinyl alcohol (PVA) fiber. Two kinds RPC, silica fume and ultra-fine cement RPCs, are prepared to compare their toughness performance. Steel fiber volume fraction is 1 and 2 % while synthetic fiber contents are 6, 9 and 11 kg/m3. The effects of hybrid fiber on the toughness performance of the two kinds of RPC were discussed. Strain hardening characteristics of load–deflection curves of hybrid fiber RPC were achieved. The test results show that the toughness index of hybrid specimens of 1 % steel fiber and 1 % macro-polyolefin fibers is larger than that of specimens with only 2 % steel fibers, especially for ultra-fine cement specimens. Comparing specimens with only 1 % steel fibers and those with hybrid fiber, the toughness index T(7) of silica fume specimens increased by 47.3–98.8 %, whereas T(7) of ultra-fine cement RPC specimens increased by 82.3–215.6 %, respectively. For higher volume of steel fiber it is advised to use less amount of micro-PVA fiber.
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