Effect of Stress on the Critical Chloride Content of Steel Bar in Simulated Concrete Pore Solution
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 10
Abstract
This work reveals influence of the stress state of steel bars on the critical chloride content for depassivation in a simulated concrete pore solution (SCPS). The passivation behavior of steel in chloride-free SCPS and depassivation behavior in SCPS with incremental addition of chloride were studied by electrochemical techniques including electrochemical impedance spectroscopy, Mott-Shottky test, cyclic voltammetry, and others. Results demonstrated that stress enhanced the redox activity in highly alkaline SCPS, where enhancement by tension was more pronounced than compression. Additionally, stress increased the donor density and dielectric properties of the constant-phase element of the passive film. The critical chloride content of steels can be considerably lowered by 80% under stress.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was financially supported by the National Natural Science Foundation of China (Grant No. 52208294), Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ22E080017), the Key Laboratory of Performance Evolution and Control for Engineering Structures (Tongji University), Ministry of Education (No. 2021KF-2), as well as the Engineering Research Center of Ministry of Education for Renewable Energy Infrastructure Construction Technology.
Author contributions: Zheng Dong contributed to the conceptualization, methodology, formal analysis, writing the original draft, funding acquisition, and project administration. Chuanqing Fu contributed to the supervision. Chentao Lu contributed to the investigation and formal analysis. Xosé Ramón Nóvoa contributed to the formal analysis and writing-review and editing. Hailong Ye contributed to the writing-review and editing.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 10 • October 2023
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© 2023 American Society of Civil Engineers.
History
Received: Nov 22, 2022
Accepted: Mar 9, 2023
Published online: Jul 25, 2023
Published in print: Oct 1, 2023
Discussion open until: Dec 25, 2023
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