This research clarifies the application of different kinds of sacrificial anode cathodic protection (SACP) in the patch and non-patch repair on more than 40-years severely damaged RC beam due to chloride-induced corrosion. The most seriously damaged concrete in the middle tensile part of the beam was replaced by polymer-modified mortar as a patch repair material. Low powered SACPs were installed on the bottom surface of rebar to provide local cathodic protection and incipient anode protection. Four additional rib and smooth SACPs 20mm were embedded in both sides of non-patch repair concrete. Three connection patterns were demonstrated until one-month including (1) sacrificial anodes in patch repair only, (2) sacrificial anodes in non-patch repair, and (3) combination sacrificial anodes both in the patch and in non-patch repair. The results show that the polarization of steel bar occurs when the steel bars connect to sacrificial anodes in the patch or non-patch repair only. The depolarization test reveals that the combination of different kinds of sacrificial anodes in the closed distance canʼt reach 100 mV potential decay criterion. So, the application of a different kind of sacrificial anode in the closed area could not be a suitable repairing system.
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