Corrosion-induced concrete damages to concrete structures results in not only affecting the
structural safety but also heavily financial burdening to the structure owners. An electrochemical
method, cathodic protection (CP), for controlling corrosion of reinforcing steel in concrete involves
techniques that interfere with the electrochemical reactions occurring on the embedded steel surface.
When CP is selected as a rehabilitation method, there are many factors that can influence the
effectiveness, durability and the cost of the CP system. To install durable and long term effective CP
systems, the causes of the failures happened in the past are important information.