The half-cell potential test is a non-destructive technique used to measure the corrosion activity in reinforced concrete structures. It involves using a half-cell electrode, which is a reference electrode that is placed on the surface of the concrete and connected to a voltmeter.
The half-cell electrode measures the potential difference between the concrete surface and a reference electrode. The potential difference is an indicator of the corrosion activity in the concrete. The half-cell potential test is a qualitative rather than a quantitative test. It provides an indication of the relative level of corrosion activity in different areas of the structure but does not provide a precise measurement of the corrosion rate. The half-cell potential test is a useful tool for assessing the corrosion activity in reinforced concrete structures and can be used to guide maintenance and repair efforts to ensure the long-term durability of the structure.