Galvanic cathodic protection (GCP) of reinforced concrete offers important advantages of simplicity, lower cost, and lack of cumbersome monitoring and maintenance procedures. But since GCP of reinforced concrete structures is relatively new, there is a general lack of long-term test results. This paper presents test data for the application of zinc anodes activated by a combination of lithium nitrate and lithium bromide in indoor test blocks, large outdoor test slabs, and field trials, all operational from 5 to nearly 8 years.