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Critical Chloride Corrosion Threshold of Galvanized Reinforcing Bars
Darwin, David Browning, JoAnn O’Reilly, Matthew Xing, Lihua Ji, Jianxin
Darwin, David
Browning, JoAnn
O’Reilly, Matthew
Xing, Lihua
Ji, Jianxin
Citations
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Abstract
The chloride content required for corrosion initiation of galvanized reinforcing bars is determined. The bars conform to ASTM A767, except that no chromate treatment was applied to allow the degree of hydrogen evolution for untreated bars to be evaluated. Test results, along with results for conventional (ASTM A615), low carbon chromium (ASTM A1035, MMFX), and 316LN stainless steel reinforcement are compared with chloride surveys of bridge decks to obtain an average time to corrosion initiation. The average critical chloride corrosion threshold of galvanized reinforcement is greater than the threshold for conventional steel and lower than the threshold for ASTM A1035 and 316LN steel. Hydrogen gas evolution did not increase the porosity of the
concrete in the non-chromate treated bars relative to that observed for conventional reinforcement. The average time to corrosion initiation at crack locations in bridge decks for galvanized steel is 4.8 years, compared with 2.3 years for conventional steel, and 15 years for ASTM A1035 steel. 316LN stainless steel will not corrode.
Description
Date
2009
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Publisher
American Concrete Institute
Research Projects
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Keywords
Bridge decks, Corrosion, Galvanized reinforcement, Low carbon chromium steel, Stainless steel, Zinc
Citation
Darwin, D., Browning, J.P., O’Reilly, M., Xing, L. and Ji, J., "Critical Chloride Corrosion Threshold of Galvanized Reinforcing Bars," ACI Materials Journal Vol. 106, No. 2, March/April 2009, pp. 176-183.