Abstract

The authors' lab experiments have shown that valuable information on the corrosion of reinforced concrete can be obtained by placing 4 electrodes parallel to the reinforcing bar on the concrete surface and measuring impedance. Mathematical modeling has confirmed that any change in the interfacial impedance at the reinforcing bar/concrete interface can be captured from the measured impedance on the concrete surface. For the 4-electrode configuration, both the electrical capacitance and resistance of the measured impedance become geometry dependent and it depends on the interfacial impedance, the measurement geometry, and the concrete material property. To illustrate this dependence, this paper presents experimental results and numerical simulations to show how the geometry and the concrete property affect the surface-measured impedance for a constant interfacial impedance. The considered variables include the relative direction between the electrode array and the reinforcing bar, the ratio of the electrode distance to the concrete cover, and the concrete resistivity. In another study by the authors, the model was used to simulate impedance responses from constant interfacial impedance as a function of the aforementioned variables. Study of the geometric effect can help to interpret measured data and optimize the measurement setup, and can also derive the embedded reinforcing bar's position and the depth of concrete cover.

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