Effect of Corrosion Inhibitors on Concrete Pore Solution Composition and Corrosion Resistance
Locke, Carl E., Jr.
Virmani, Y. Paul
American Concrete Institute
Scholarly/refereed, publisher version
Copyright © 2013, American Concrete Institute. All rights reserved, including the making of copies unless permission is obtained from the copyright proprietors. Pertinent discussion including author’s closure, if any, will be published in the July-August 2014 ACI Materials Journal if the discussion is received by April 1, 2014.
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Three commercially available corrosion inhibitors—calcium nitrite, a solution of amines and esters, and an alkenyl-substituted succinic acid salt—are evaluated in conjunction with conventional reinforcement in concrete based on corrosion rate, metal loss, the critical chloride corrosion threshold (CCCT), pore solution analyses, and concrete compressive strength. All three inhibitors increase time to corrosion initiation and decrease corrosion rate, but are less effective in cracked concrete than in uncracked concrete. Of the three inhibitors, the alkenyl-substituted succinic acid salt results in the greatest decrease in corrosion rate, but exhibits the lowest CCCT—below that measured in concrete with no inhibitor. The compressive strengths of concretes containing the amine-ester inhibitor and the alkenyl substituted succinic acid salt were 15% and 60% lower, respectively, than concrete without an inhibitor. For the latter inhibitor, pore solution analyses indicated elevated sulfate contents at 1 and 7 days, which may explain the low CCCT and strength. Paste containing the amine-ester inhibitor had an elevated sulfate content at 7 days.
O'Reilly, M., Darwin, D., Browning, J., Xing, L., Locke Jr., C.E., and Virmani, P., "Effect of Corrosion Inhibitors on Concrete Pore Solution Composition and Corrosion Resistance," ACI Materials Journal, Vol. 110, No. 5, September-October 2013, pp. 577-585.
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