Abstract
The aim of the present work is to evaluate the corrosion behaviour of different types of stainless steel reinforcement and to determine their suitability for the use in a chloride contaminated concrete environment. Electrochemical impedance spectroscopy (EIS) measurements were performed on steel reinforcement specimens in a simulated concrete pore solution containing chlorides. The concrete specimens, with embedded electrical resistance (ER) probes for corrosion monitoring, were subjected to cyclic wetting-drying. Reinforced concrete columns with ER probes and coupled multi-electrodes for the measurement of partial currents were exposed to a real marine environment. Traditional stainless steel reinforcement in chloride contaminated environment behaves significantly better than carbon steel. Austenitic low-Ni stainless steel showed similar corrosion resistance to that of the traditional stainless steels, whereas ferritic stainless steel was found to be unsuitable for use in such environments. ER probes and coupled multi-electrodes were shown to be promising methods for corrosion monitoring in concrete.
Zusammenfassung
Das Ziel der vorliegenden Arbeit besteht darin, das Korrosionsverhalten verschiedener Arten von Edelstahlverstärkungen auszuwerten und ihre Eignung für den Einsatz in chloridbelasteten Betonumgebungen zu prüfen. Mittels der Elektrochemischen Impedanzspektroskopie (EIS) wurden Messungen mit Stahlverstärkungsproben in künstlicher Betonporenlösung mit Chloriden durchgeführt. Betonproben mit integrierten EW-Sonden zur Überwachung der Korrosion durchliefen verschiedene Nass-Trocken-Zyklen. Verstärkte Stahlbetonsäulen mit EW-Sonden und gekoppelten Multielektroden für Teilstrommessungen wurden einem realen Meeresumfeld ausgesetzt. Eine herkömmliche Edelstahlverstärkung in chloridbelasteten Umgebungen verhält sich signifikant besser als Kohlenstoffstahl. Austenitischer Edelstahl mit niedrigem Nickelgehalt zeigte eine ähnliche Korrosionsbeständigkeit wie herkömmlicher Edelstahl, während ferritischer Edelstahl für die Verwendung in solchen Umgebungen für ungeeignet befunden wurde. EW-Sonden und gekoppelte Multielektroden erwiesen sich als vielversprechende Methoden zur Korrosionsüberwachung in Beton.
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Acknowledgements
The work described in this paper forms parts of the EC FP6 project ARCHES, the EC FP7 project TRIMM, and the IAEA Research Contract SLO 17810.
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Gartner, N., Kosec, T. & Legat, A. Monitoring of the Long-term Performance of Stainless Steel Reinforcement in Saline Environments. Berg Huettenmaenn Monatsh 161, 44–49 (2016). https://doi.org/10.1007/s00501-016-0444-z
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DOI: https://doi.org/10.1007/s00501-016-0444-z
Keywords
- Corrosion in concrete
- Stainless steel reinforcement
- Long-term exposure
- Field exposure
- Electrical resistance (ER) probes
- Coupled multi-electrodes