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후크형 강섬유와 폴리비닐알코올 섬유의 혼합 비율과 변형속도에 따른 하이브리드 섬유보강 시멘트복합체의 인장거동 KCI 등재
Tensile Behavior of Hybrid Fiber Reinforced Cement Composite According to the Hooked Steel Fiber and Polyvinyl Alcohol Fiber Blending Ratio and Strain Rate
pp.98-105
In this study, the fiber blending ratio and strain rate effect on the tensile behavior of hybrid fiber reinforced cement composite was evaluated. Hooked steel fiber and polyvinyl alcohol fiber were used for reinforcing fiber. The fiber blending ratio of HSF+PVA were 1.5+0.5, 1.0+1.0 and 0.5+1.5vol.%. As a results, the tensile strength, strain capacity and fracture toughness of the hooked steel fiber reinforced cement composites were improved by the increase of the bond strength of the fiber and the matrix according to increase of strain rate. However, the tensile stress sharply decreased after the peak stress because of the decrease in the number of straightened pull-out fibers by micro cracks in the matrix around hooked steel fiber. On the other hand, PVA fiber showed cut-off fracture at strain rate 10-6/s with multiple cracks. However, at the strain rate 101/s, the multiple cracks and strain capacity were decreased because of the pull-out fracture of PVA fiber. 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. In addition, the synergistic response of fracture toughness was positive because the tensile stress was slowly decreased after the peak stress by improvement of the pull-out resistance of hooked steel fiber at strain rate 101/s
1. 서 론
2. 실험계획 및 방법
2.1 실험 계획
2.2 사용재료 및 배합
2.3 실험 방법
3. 실험결과 및 고찰
3.1 인장응력-변형 곡선 및 파
3.2 섬유 혼합비에 따른 인장특성 시너지 효과
3.3 인장특성에 미치는 변형속도의 영향
4. 결 론
감사의 글
References
