직접뽑힘 실험을 통한 초고성능 콘크리트의 부착거동에 대한 연구

초록

Because of the low workability ultra high strength concrete reinforced with steel fiber is difficultto use as cast-in-place concrete and generally used as precast concrete member. Using ultra highstrength concrete reinforced with steel fiber for precast system safely, bond mechanism betweenultra-high strength concrete and steel reinforcement should be examined. However, there are noexact design specification about bond strength design for ultra-high strength concrete reinforcedwith steel fiber. Therefore, in this study, direct pull-out test was carried out. the main variable ofthis study is compressive strength of concrete, fiber inclusion and concrete cover. according to thetest results, bond strength of ultra-high strength concrete is highly affected by the variation ofconcrete cover, as similar with normal concrete. Bond strength are proportional to square root ofcompressive strength of concrete.