Abstract
Pull-out tests were carried out on deformed steel fibers embedded in cement-based matrices. Four matrices including plain cement paste, cement paste with 10% silica fume, cement paste with 10% high reactivity metakaolin (HRM), and cement paste with a combination of 5% silica fume and 5% HRM in the same mix were investigated. Based on the resulting bond-slip curves, HRM was found to be more effective in improving the pull-out performance than silica fume. However, when silica fume and HRM were combined in the same mix, an excessive improvement in the bond occurred which led to undesirable fiber fractures, and consequently, a brittle behavior.
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