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Proceedings Paper

Electrochemical evaluation of corrosion inhibitors for repairing of highway transportation infrastructures
Author(s): K. Wayne Lee; Yong Cao; Richard Brown; Rui-Guang Guo
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Paper Abstract

Among the methods to tackle corrosion of steel reinforcement in highway transportation infrastructure, using corrosion inhibitors has been identified as the most easily and economically applied technique. This study used Electrochemical Impedance Spectroscopy (EIS) to evaluate four corrosion inhibitors in simulated pore solution (SPS) and saturated calcium hydroxide solution (CHS). Three promising inhibitors were identified. It was also found that the electrochemical laboratory test was practical to evaluate corrosion inhibitors quickly and effectively in simulated concrete solutions. A simulated field concrete repair method was devised in order to verify the developed electrochemical laboratory test result. Sixty-three concrete short beam specimens were used. The embedded steel rebars were exposed to chloride environment and electrochemically monitored in accordance with the ASTM G109 procedure. After active corrosion of the upper rebars was detected, the chloride- contaminated concrete was removed. The three aforementioned promising inhibitors were applied to corroded rebars, and new concrete was cast. These rebars were electrochemically monitored to evaluate the effectiveness of corrosion inhibitors for corrosion control. It was found that there was a good correlation between these two test results, and the most effective inhibitor was finally identified.

Paper Details

Date Published: 9 June 2000
PDF: 12 pages
Proc. SPIE 3995, Nondestructive Evaluation of Highways, Utilities, and Pipelines IV, (9 June 2000); doi: 10.1117/12.387839
Show Author Affiliations
K. Wayne Lee, Univ. of Rhode Island (United States)
Yong Cao, Univ. of Rhode Island (United States)
Richard Brown, Univ. of Rhode Island (United States)
Rui-Guang Guo, Univ. of Rhode Island (United States)

Published in SPIE Proceedings Vol. 3995:
Nondestructive Evaluation of Highways, Utilities, and Pipelines IV
A. Emin Aktan; Stephen R. Gosselin; Stephen R. Gosselin, Editor(s)

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