Effect of corrosion-induced crack and corroded rebar shape on bond behavior

This paper investigated individual effect of corrosion-induced crack and corroded rebar profile on bond behavior. Test specimens were corroded by accelerated electric corrosion method and bond-slip relationship was measured by two ends pull-out test. Test specimens were divided into different groups. For the normal corrosion group, bond test was conducted directly after the corrosion test to investigate the synthesis effect of rebar corrosion including corrosion-induced crack, corroded rebar profile and rust on bond deterioration. In another group, rust was removed from corroded rebar and casted into new concrete to evaluate single effect of corroded rebar profile. Similarly, corroded rebar with rust was casted into new concrete to evaluate the effect of the formation of corrosion product on the degradation of bond. Under various corrosion degrees, the influence of corrosion crack, shape of corroded rebar and rust around rebar on bond behavior were discussed separately. Corrosion crack in concrete was clarified to be more dominant factor than corrosion profile in bond deterioration mechanism.