In the idea of Nyquist diagram,hollow threaded bar can be observed that most of the spectra own similar features, which are described by an electric resistance in series with a RC network.
The series resistance brings about a ionic operation in the electrolyte filling the pores, hense the other elements point to the double layer capacitance at the interface of hollow steel bar and the charge transfer resistance capability.
In a lot of cases, the Nyquist diagram presents a third semicircle in intermediate frequencies.This semicircle can show the configuration of new products on the steel surface of hollow threaded bar, among them the corrosion.
However, the capacitive arch between 104 Hz and 10 Hz is related to a fine deposit of calcium hydroxide that develops on the steel surface slowly after being immersed in concrete formation, since the estimated diameter of the semicircle formed in high frequencies is extremely large. This suggest that the charge transfer resistance is very high and could not be measured in the range of frequencies tested.
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