Fig. 16
From: Inspecting the corrosion state of underground reinforced concrete structures
Result of the electrical resistance measurement at different distances from the steel for the field measurement (all measurements corrected by the internal resistance of the electrode). The colors indicate the number of the measurement (see Table 1). The solid line represents the resistance while the sensor is positioned inside the protective tube, whereas the dashed line represents the resistance when the sensor is pressed against the ground by turning the lever controlling the push-out mechanism