Estimation of steel corrosion rate in reinforced concrete by means of equivalent circuit fittings of impedance spectra

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TypeArticle
Journal titleAdvances in Cement Research
Volume10
IssueApril 2
Pages4356; # of pages: 14
SubjectCorrosion (of reinforced concrete)
AbstractThree equivalent circuit models were utilized to fit the alternating current (AC) impedance spectra obtained from the 5-year-old, 'lollipop-like' reinforced concrete samples. The RC parameters obtained from two of the equivalent circuit fittings were compared. Specifically, the differences in polarization resistance, Rp, and doublelayer capacitance, Cdl, were evaluated and the variation in the values of these elements found to be up to 70%. These two parameters were also determined from the fitting of the low-frequency portion of the corresponding impedance spectrum for the third equivalent circuit, and the differences were within 40%. The other RC parameters and their relationship with Rp, were also discussed. Finally, the corrosion rates of the 'lollipop-like' samples, determined from both the AC impedance and linear polarization methods, were compared and the differences in this study found to be about 100%.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number42087
8622
NPARC number20331557
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Record identifier6daf0e0c-9f06-4f5f-962b-765d336de611
Record created2012-07-18
Record modified2016-05-09
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