Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 23, Issue 5, Pages 1902-1908Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2008.09.011
Keywords
Chloride threshold values; Detection methods; Steel reinforcement; Corrosion
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Funding
- Opening Project of Key Laboratory of Coastal Disasters
- Defence of Ministry of Education, Hohai University
- Natural Science Foundation of Hohai University
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The aim of this study is to evaluate the influence of depassivation detection methods on chloride threshold value for the corrosion of steel reinforcement in a concrete. The detection methods of depasstivating steel reinforcement have been examined including electrochemical impedance spectra (EIS), potentiodynamic polarization (PP) in a simulated concrete pore solution and half-cell potential, linear polarization (LP) and electrochemical impedance spectra (EIS) in the concrete contaminated by chloride ions. The results have indicated that in a saturated Ca(OH)(2) solution, the chloride threshold value for the corrosion of steel reinforcement concluded by the potentiodynamic polarization is 0.02 mol/L. which is identical with that decided by EIS. However, in the chloride contaminated concrete, no agreement among the chloride threshold values determined by the three detection methods mentioned above can be found. The range of the values decided by half-cell potential is relatively lower than those by the others. besides, the highest values have been obtained by EIS. (c) 2008 Elsevier Ltd. All rights reserved.
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