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A cathodic protection system using a mesh of polymeric anodes to protect the reinforcing steel in a concrete substructure is described. The above ground structure was actively corroding as indicated by a preinstallation potential survey and analysis of chloride concentrations in the concrete. Gunite was used to permanently attach the anodemesh to the concrete and to provide an electrolyte for distribution of the cathodic protection current. Two criteria were used to determine the level of cathodic protection current required to inhibit corrosion of the reinforcing steel. Test results indicate that the steel has been polarized 300 mV cathodic of its native potential and that the structure is well protected. The system continues to perform as expected after ten months of continuous operation.
cathodic protection, anodes, corrosion, portland cement concrete, reinforcing steel, reference electrode
Manager of applications research, Raychem,