BOND STRESS TRANSMISSION MECHANISM IN THE INTERFACE BETWEEN ULTRA HIGH STRENGTH FIBER REINFORCED CONCRETE AND REINFORCING BARS

Ultra high strength fiber reinforced concrete has the excellent properties, such as high strength, high flowability, and high ductility with short fiber reinforcement. To realize actual structures, it is necessary to clarify the bond stress transmission mechanism in the interface between UFC and reinforcing bars. In this study, the relationship between localized bond stress and slip, and the average strength as the bond stress transmission mechanism are investigated. To clarify the relationship between localized bond stress and slippage, the pull-out test is carried out. Furthermore, to clarify the average bond strength, bending tests with RC beams having the lap splice are carried out.