Strain Rate Effect on tensile properties of Hooked Steel Fiber and PVA Fiber hybrid reinforced cementitious composites

후크형 강섬유와 PVA섬유를 하이브리드 보강한 시멘트복합체의 인장특성에 미치는 변형속도의 영향

In this study, the tensile properties of hybrid fiber reinforced cementitious composites under the high strain rate was evaluated. Experimental results, the HSF1.5PVA0.5 shown the highest tensile strength because the PVA fiber suppressed the micro cracks in the matrix around the hooked steel fiber and improved the pull-out resistance of hooked steel fiber. Thus, DIF of strain capacity and fracture toughness of HSF1.5PVA were greatly improved. Also, the fracture toughness was greatly improved because the tensile stress was slowly decreased after the peak stress by improvement of the pull-out resistance performance of hooked steel fiber at strain rate 10¹/s.