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| Abstract |
In this study, patch repair and sacrificial anode cathodic protection (SACP) techniques were applied to 44-year-old RC beams in which steel bars were corroded severely in order to extend the service l...ife of beams. In the first repair stage, polymer modified mortar was used to replace the existing concrete after the installation of embeddable sacrificial anodes along with the un-rusted rebar. The polarization effect demonstrated that the protection area limited in the patch repair section due to the electrochemical incompatibility between the new material and the existing concrete. Disconnecting the sacrificial anodes during a year is applied for observing rebar condition during the absence of current supply in patch repair system as second repair stage. It indicates that the rebars in the patch repair area have remained passive with no corrosion sign. It shows that polymer modified mortar has a persistent protective effect in the absence of cathodic protection. In order to enlarge the protection area, additional sacrificial anodes were inserted in the existing concrete as the third stage. From 12-month observation, application of sacrificial anodes both in the patch and non-patch repair concrete is sufficient to provide negative potential shift with an optimum distance of 400 mm for each anode in order to achieve 100 mV depolarization. The polarization of rebar in patch repair is limited to 200 mm from the boundary.show more
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