Bond Behavior of Steel Rebars

UHPC has exceptional bond with steel rebars, which allows for an extremely small embedment length. To get a sense for this excellent performance, bridge closure pours can be reduced in size from 500 mm (20 in) to just 100 mm (4 in). Based on research in, Alkaysi and El-Tawil, an assumed bond stress, τbond, equal to 1.1√f’c (MPa), can be used for estimating the required embedment length in UHPC.

Failure modes observed during pullout of steel rebars embedded in UHPC