Half-Cell Potential Test
The Half-Cell Potential Test (HCP) is a non-destructive technique used to assess the risk of corrosion in reinforced concrete. By measuring the electrical potential between a reference electrode placed on the surface and the internal reinforcement, it is possible to identify areas at risk of corrosion without removing the concrete cover. More negative potential values indicate a higher probability of active corrosion, while more positive values suggest a less aggressive environment. This test is especially useful for early corrosion detection, monitoring deterioration, and planning preventive maintenance. Its advantages include speed, low cost, and non-invasiveness, although accuracy depends on the concrete’s moisture content and the electrical continuity of the reinforcement.