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.

Related formulas

Variables

ρElectrical resistivity (ohm*m)
RThr resistance (ohm)
DThe diameter of the surface probe. (m)