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A Half-Cell Gauge measures the condition and potential corrosion of rebars and steel structures in concrete.

When corrosion occurs the ferric oxide protective layer surrounding the rebar breaks down allowing an electrochemical reaction between the steel and the concrete.

In the half-cell test, the reference electrode is passed over the surface of the concrete and the potential voltage difference is recorded. The readings show where corrosion is likely to be or is currently present.

Periodic monitoring of the condition of the rebars and metal supporting structures in buildings, bridges etc. identifies signs and severity of corrosion - long before there are any physical indications of damage. Thus enabling more accurate forecast of projected lifetime.

When the covermeter readings are combined with half-cell readings, the user has a powerful surveying tool. This can be easily achieved using the Elcometer Covermaster Software.