TENSILE BOND STRENGTHS OF DEFORMED BARS OF HIGH-STRENGTH CONCRETE

Results are presented from an experimental investigation into the tens ile. bond strengths of deformed bars embedded in high-strength concret e (f(c)' less than or equal to 70 MPa). A total of 20 beam specimens i n two series was tested statically to measure both the splice strength and the development strength. Other variables included concrete stren gth, anchorage length, and the amount of transverse reinforcement. The bond performance of high-strength concrete without silica fume was fo und to be similar to that of normal-strength concrete. The equivalence between the tensile development length and the tensile splice length for high-strength concrete was established. The applicability of exist ing models to predict the bond strength of high-strength concrete was examined. The tests showed that total confinement beyond the currently accepted limit was still effective for the bond action of high-streng th concrete.