Sprayed Zinc Galvanic Anode for Corrosion Protection of Marine SubstructureReinforced Concrete

摘要

This project developed guidelines for using sprayed zinc (as a sacrificial anodesystem) for protecting reinforced steel (acting as cathode) from corrosion in maring bridge substructures. The feasibility of the approach was demonstrated both in laboratory and field experiments. Additional performance data was obtained in large-scale field application. The field work was caried out in collaboration with the Florida Department of Transportation during the rehabilitation of the Howard Franklin Bridge on Tampa Bay. The tests showed adequate probe and steel polarization (typically exceeding the 100mV depolarization criterion) with moderate current demand (below 1 mA/sf, ft.) indicating continued cathodic protection of steel substructure. Based on field results, an implementation manual on the use of sprayed zinc for the protection of marine substructures was prepared.