Bond behavior between corroded steel bar and concrete under reciprocating loading history of beam type specimens.

• Beam type specimen. • Reciprocating loading history. • Steel bar corrosion. • Bond stress-slip relationship. • Degradation model of bond strength. The bond between steel bars and concrete can be deteriorated by corrosion. A series of beam specimens with initial cracks were cast to study the effects of corrosion on bond behavior. The current-induced accelerated corrosion technique was used to reach four levels of corrosion (0%, 3%, 5% and 7%), and different amplitudes of reciprocating load (0%, 10%, 20% and 30% of ultimate load) were applied on the specimens. Finally, the flexural-bond test was carried out on specimens to obtain the bond strength and bond stress-slip relationships. The results show that the bond strength decreases with the increase in corrosion rate, and deterioration under the coupling condition of reciprocating load and corrosion is more significant, which can be reduced over 50%. And the higher the corrosion level, the faster the slip increases. In addition, the bond stress-slip relationship and the bond strength degradation model are proposed, which can be used to predict the changes of bond behavior under corresponding working conditions. [ABSTRACT FROM AUTHOR]