Sacrifical Anodes for Cathodic Protection of Reinforcing Steel Around Patch Repairs Applied to Chloride-Contaminated Concrete, Sergi & Page

When steel reinforcement suffers localised corrosion in chloirde contaimated concrete, the most anodic regions of the metal effectively provide cathodic protection to the bars in adjacent cathodic areas.  If conventional patch repair is applied to the structure, this form of adventitious cathodic protection is removed and bars which were previously behaving as cathodes in moderately contaiated areas may be transformed to anodes of cells, coupled to cathodic steel in the repaired areas.  This paper demonstrates the effectiveness of combining patch repair with embedded sacrificial anodes as a means of providing continuing protection to the surrounding reinforcing bars.  (read more)