건설재료시공학연구실

Building material & construction lab.

Abstract
In this study, the direct tensile fracture behavior of hybrid fiber reinforced cement composites by strain rate was evaluated. As a result, in the hooked steel fiber reinforced cement composite, the bond strength between the fiber and the matrix improves at high strain rate, so that the number of fibers which the hooks are shaped into a straight shape is reduced. On the other hand, in the case of hybrid with 1.5 vol.% of hooked steel fiber and 0.5 vol.% of PVA fiber, PVA fiber suppresses micro crack generation of the matrix around the hooked steel fiber, so that the pull-out resistance performance of hooked steel fiber was improved. Consequently, the number of fibers which the hooks are shaped into a straight shape were increased.