Accelerated Laboratory Assessment of Discrete Sacrificial Anodes for Rehabilitation of Salt-Contaminated Reinforced Concrete
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 11
Abstract
For patch repairs of chloride contaminated RC structures, the use of discrete sacrificial anodes (DSAs) is indispensable. Without DSAs embedded, due to the ring effect, the failure of the RC around the patch area is accelerated. DSAs are increasingly being used, but few studies have evaluated the effectiveness of different DSAs and effects of the surrounding environment on the performance of different DSAs. This study employed four electrical parameters and electrochemical impedance spectroscopy (EIS) to evaluate three types of DSAs embedded in chloride-contaminated concrete through wet–dry and freeze–thaw cycles. The corrosion of the reinforcements is a stochastic process and the bound chloride ions play an important role in determining the corrosion state of the reinforcement. Most of the DSAs provided effective cathodic protection, but the effectiveness of DSAs could be influenced by the corrosion state of the reinforcement. The wet–dry and freeze–thaw cycles had significant influence on the performance of two types of the DSAs. Current DSA designs do not fully utilize the embedded Zn alloy.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was financially supported by a gift fund from Simpson Strong-Tie Company. The authors extend their appreciation to Dr. Mehdi Honarvar Nazari for help with the EIS and data interpretation and to Junliang Wu for help with the measurements of half-cell potential, depolarized potential, and instant-on potential. BASF–United States is acknowledged for donating the water-reducing admixture used in this work. The ideas of improving DSA design presented in this work have been protected by a patent application.
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Journal of Materials in Civil Engineering
Volume 32 • Issue 11 • November 2020
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This work is made available under the terms of the Creative Commons Attribution 4.0 International license, https://creativecommons.org/licenses/by/4.0/.
History
Received: Mar 15, 2019
Accepted: Mar 24, 2020
Published online: Aug 25, 2020
Published in print: Nov 1, 2020
Discussion open until: Jan 25, 2021
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