SEDL / STP / STP906-EB / STP18302S

The Determination of the Corrosion Rate of Steel Embedded in Concrete by the Polarization Resistance and AC Impedance Methods

Andrade, C
Researcher, researcher, and research fellow, Institute of Construction and Cement “Eduardo Torroja,” CSIC, Madrid,

Castelo, V
Researcher, researcher, and research fellow, Institute of Construction and Cement “Eduardo Torroja,” CSIC, Madrid,

Alonso, C
Researcher, researcher, and research fellow, Institute of Construction and Cement “Eduardo Torroja,” CSIC, Madrid,

González, JA
Senior researcher, National Centre of Metallurgical Research, CSIC, Madrid,

Pages: 21    Published: Jan 1986

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Abstract

The polarization resistance Rp determination has been widely used by the authors to measure the corrosion rate of steel bars embedded in concrete in many different situations. The AC impedance measures have now started to be used within the same system. In the present paper, we present the way to obtain accurate data by the Rp method. Comparison of the results of Rp with the weight losses determined gravimetrically and some of the results of the corrosion rates of steel bars embedded in concrete calculated by this method are presented. Also, presented here are results of AC impedance of the reinforcements obtained through a spectrum analyzer. Additionally the different graphical methods for representing the results and the accuracy of this technique in comparison with those of the Rp method are discussed. Finally, some considerations about the use of both techniques are drawn.