Half Cell Potential Testing
ASTM C876

Half Cell Potential Testing - What is it?

Half-cell potential testing is a non-destructive electrochemical method used to evaluate the probability of active corrosion of reinforcing steel embedded in concrete. Testing is performed by electrically connecting to the reinforcing steel and measuring the electrical potential between the steel and a reference electrode placed on the concrete surface.

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Measurements are typically collected across a grid to develop a corrosion potential map of the structure. The magnitude and spatial variation of these potentials can be used to identify areas where reinforcing steel is more likely to be actively corroding.

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Half-cell potential testing is commonly used during condition assessments of reinforced concrete structures exposed to chlorides, moisture, carbonation, or other conditions that may promote corrosion. Results are particularly valuable when evaluated alongside delamination surveys, chloride testing, concrete cover measurements, electrical resistivity, and corrosion rate testing to develop a more complete understanding of the corrosion picture at play in the structure.