ABSTRACT
In these days, there are many reinforced concrete members that are damaged by chloride induced corrosion. Usually, the members are repaired to satisfy their required serviceability. When repaired, there should be joints between old concrete and repair material and some rebars are crossing the joints. In these cases, the macro-cell currents in these rebars are possibly very large due to the interaction between the old concrete and the repair material having different properties.
In this study, the behavior of macro-cell corrosion on embedded steel bars in concrete members with joints is investigated experimentally. The macro-cell currents and potentials of steel bars were measured in specimens. The macro-cell currents were compared with the micro-cell currents calculated using the polarization resistance and the influences of those on the corrosion were studied. The comparison between the properties of the surroundings of concrete members and the oxygen permeability or the resistance of concrete member is investigated ’and the influences of those on the corrosion are studied.
As a result, it was confirmed that the concentration of chloride ion, the oxygen permeability and the resistance of concrete members affect the corrosion behavior of embedded steel bars.
