Performance enhancing chemicals were applied to metallized zinc anodes on three reinforced concrete field structures: a parking garage, a condominium, and a motorway substructure crosshead. In the parking garage, a structure that contained pre-stressed, post-tensioned reinforcing steel, 4-hr potential decays averaging 146 mV were measured on tendon anchorages. On the motorway crosshead, polarization was
satisfactory 6 months after energizing, but decreased after 9 months operation in galvanic mode. Use of the enhancing agent at the condominium resulted in significant improvement in both protective current and steel polarization. Keywords: anodes, cathodic protection, concrete, corrosion, reinforcing steel, zinc.