Concrete electrical resistivity (rebars method)

Description

Rebar (short for reinforcing bar), is a steel bar or mesh of steel wires used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and hold the concrete in tension. Rebar’s surface is often patterned to form a better bond with the concrete. The presence of rebars disturbs electrical resistivity measurement as they conduct current much better than the surrounding concrete. Measurement of the resistance between a rebar and a single probe at the concrete surface is sometimes done in conjunction with electrochemical measurements. The resistivity can be calculated by the measured resistance and the diameter of the surface probe.