Impressed Current Cathodic Protection in Concrete

To install an impressed-current cathodic protection (ICCP) system, a few basic components are required, in addition to the reinforcing steel and the concrete in the structure to be protected (reference):

Controlled external DC power source (typically a rectifier)
Current distribution system (anode system)
Wiring
Evaluation or monitoring devices (reference cells, corrosion probes, etc.)
Among these components, the anode system is probably the most critical

For use on bridge decks, an anode system must have the following characteristics:

Capability to withstand traffic loads and environmental influences
Sufficient durability to have design life equal to or greater than that of the wearing surface
Sufficient conductive surface area to minimize or completely prevent premature deterioration of surrounding concrete
Economical

Overpass on Division St. in Kingston, Ontario (Canada) where one the very first installations of an impressed cathodic protection system in North America is still in operation.