Corrosion-Inhibiting Systems for Durable Concrete Bridges. I: Five-Year Field Performance Evaluation
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Volume 20, Issue 1
Abstract
The performance of nine commercially available corrosion-inhibiting systems for use in reinforced concrete structures exposed to corrosive environments was assessed in the field on bridge barrier walls and in accelerated electrochemical cells in the laboratory. The corrosion-inhibiting systems included concrete admixtures, reinforcing steel coatings, and/or concrete surface coatings/sealers. The results of this study are presented in two companion papers, in which the field evaluation and laboratory investigation are reported. The field evaluation consisted of annual corrosion surveys of half-cell potential and corrosion rate, as well as remote monitoring with embedded instrumentation for the measurement of the environmental conditions. After five years of investigation, the system containing an inorganic-based admixture performed better than others in reducing the risk of reinforcement corrosion in the barrier wall. It was also found that the system using epoxy-coated reinforcement showed good early performance during the first year, but after, the risk of corrosion increased relatively faster than in other systems, possibly due to localized pitting corrosion developing in small defects or pores of the epoxy coating.
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Acknowledgments
The financial and technical contributions of our project partners are gratefully acknowledged, namely, Ministère des Transports du Québec (MTQ), Axim-Italcementi Group, Caruba Holdings, Euclid Admixture Canada, Israel Richler Trading, Master Builders Technologies, Sika Canada, W.R. Grace & Co., the Regional Municipality of Peel, and IRAP. The sustained assistance of Louis Marie-Bélanger and Daniel Vézina from the MTQ is also gratefully acknowledged. The writers would also like to thank Noel Mailvaganam and Roger Willoughby for their expertise and advice, and Mark Arnott, Rock Glazer, Ted Hoogeveen, and Gordon Chan for their valuable technical assistance.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 20 • Issue 1 • January 2008
Pages: 20 - 28
Copyright
© 2008 ASCE.
History
Received: May 13, 2005
Accepted: Nov 30, 2006
Published online: Jan 1, 2008
Published in print: Jan 2008
Notes
Note. Associate Editor: Byung Hwan Oh
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