Abstract
To understand the bond behavior between the steel-polyethylene hybrid fiber engineered cementitious composite (HECC) and rebar, direct pullout tests were conducted to systematically investigate the effects of rebar diameter d, anchorage length la, and cover thickness c on the bond performance. The experimental results indicate that the variation in bond strength with d is not apparent; la affects negatively while c influences positively the average bond strength; and the critical c for HECC is about 4d. Additionally, the bond strength of HECC specimen is obviously higher than that of ECC and stirrup-confined concrete due to the crack-bridging effect of hybrid fibers at different scales. As noted, the ductility of HECC specimens is comparable with that of stirrup-confined concrete specimens, indicating that stirrup can be partially replaced when HECC is used, which can simply be constructed. Then, a calculation equation for the average bond strength of HECC is proposed, and the critical anchorage length of the rebar embedded in HECC is ≈40% less than that embedded in ECC. Lastly, the design anchorage length of the rebar embedded in HECC is suggested based on a reliability analysis which is much smaller compared with the minimum embedment length of rebar in concrete predicted by the existing standards, providing a useful reference for reinforced HECC structural design.
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