Protection and Time-Varying Characteristic of Rebar Corrosion in Magnesium Oxychloride Cement Recycled Concrete under the Simulated Salt Lake Environment
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 9
Abstract
Magnesium oxychloride cement recycled concrete (MOCRC) has the advantages of low carbon emissions and energy savings. To better understand the rebar corrosion problem in MOCRC under a salt lake environment, this paper presents the investigation of rebar corrosion behavior in MOCRC, as well as the difference of protective influence between single and double protective methods. During the investigation, the concrete surface strengthening materials and rebar type selection were selected as protective methods, and an electrochemical test based on linear polarization method and Tafel method was introduced. According to the time-varying characteristics of corrosion current density and mass loss of rebar in different specimens, a time-varying model of corrosion current density of rebar was established. The results show that the values of corroded hot-rolled plain steel (HS), corroded HS with self-developed coating (CS), uncorroded CS, and uncorroded stainless steel (SS) were 28, 34, 41, and 45 mV, respectively. Also, the rebar type selection has far better protective influence than the concrete surface strengthening materials, and the double protective method was better than the single protective method. Besides, it was noticed that the time-varying characteristic of rebar corrosion in MOCRC conformed to the logarithmic-type time-varying model, which has an upward trend in the earlier stage and exponential-type time-varying model with a downward trend in the later stage. Finally, this study presents a profound investigation for the reinforcement corrosion in low-carbon and energy-saving building MOCRC structures.
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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
Financial supports from the Guiding Science and Technology Plan Project of Social Development in Zhenjiang City (FZ2022057) and National Natural Science Foundation of China (52108216 and 52208254) are gratefully acknowledged.
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Journal of Materials in Civil Engineering
Volume 35 • Issue 9 • September 2023
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© 2023 American Society of Civil Engineers.
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Received: Oct 20, 2022
Accepted: Feb 24, 2023
Published online: Jun 28, 2023
Published in print: Sep 1, 2023
Discussion open until: Nov 28, 2023
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