Cathodic protection (CP) of reinforced concrete structures has become increasingly popular and is now being routinely installed on many structures around the world. The most popular cathodic protection systems have their anodes placed on the surface of the concrete, in slots or in holes. Generally, the couplant to electrolytically connect the primary anode to the concrete substrate is grout, mortar or sprayed concrete with a hydraulic cement base. This bonds to the original concrete, which is in ionic connection with the steel reinforcement and provides a continuous path for ionic current flow from the anode to the reinforcement.