The successful application of cathodic protection to corroding reinforced concrete Navy pier structures is expected to provide significant increases in the success and longevity of such repairs. Reinforced concrete structures which directly contact seawater present a special challenge for cathodic protection systems. Cathodic protection systems showing the most promise for Navy marine structures were identified in the Phase I study. They include (1) thermally-sprayed zinc, (2) thermally-sprayed titanium, (3) titanium mesh and mortar/concrete and 94) titanium mesh in shotcrete. These systems would be considered for all applications above the tidal zone. For applications on piles below the tidal zone, shore-mounted or pile-mounted anodes would be used. Thermally sprayed titanium will be evaluated as a preferred CP anode for Navy pier structures in the Phase II investigation. The Phase II work will include both laboratory and field studies. The laboratory work will resolve key issues which relate to cathodic protection of tidal zones. Following this work, a trial will be conducted on a Navy pier. The trial will involve the installation and monitoring of a cathodic protection system using sacrificial anodes in the sea water, and a thermally-sprayed titanium anode applied to atmospheric portions of the structure.
Keywords: CATHODIC PROTECTION MARINE STRUCTURES REINFORCING STEEL QUALITY CONTROL CORROSION REPAIR
