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To prevent deterioration of the reinforced concrete infrastructure, many new structures are installed with Cathodic Protection. Electrical Resistance (ER) probes evaluate the effectiveness of the Cathodic Protection system, as well as provide a test piece that can be electrically isolated to facilitate Cathodic Protection measurements such as de-polarization rates.
In some cases, the cathodic protection may not be installed, or switched on, until corrosion is likely to commence as a result of chloride penetration into the concrete.
When the initiation of the Cathodic Protection is delayed after the initial construction, it is critically important to know the timing for applying the Cathodic Protection. Subsequently, it is important to control the Cathodic Protection and ensure that the steel is being fully protected.