Corrosion of Strained Plain Rebar in Chloride-Contaminated Mortar and Novel Approach to Estimate the Corrosion Amount from Rust Characterization
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 10
Abstract
Some of the steel bars used in reinforced concrete construction experience plastic strain due to various operations at construction sites. The present work concentrates on the corrosion behavior of such prestrained reinforced bars (rebars) embedded in chloride-contaminated cement mortar and exposed to laboratory conditions (temperature of and relative humidity of 60%) for 18 months. The corrosion behavior of these rebars was examined in terms of the electrochemical parameters [open circuit potential (OCP) and polarization resistance ], effective volumetric expansion ratio, and the thickness of the rust at the metal–mortar interface. Cyclic change in the OCP and of the bars with time has been observed due to the formation of corrosion products at the interface. The preinduced plastic strains affected both the polarization resistance and the corrosion-induced mass loss of the rebar. The strained rebars showed higher corrosion susceptibility and corrosion amount than the unstrained rebars due to the changes in the surface condition and microstructure on account of high plastic deformation. The mass of the iron lost to form rust at the interface has been estimated using a novel volumetric expansion ratio model by taking the individual contribution of corrosion products at the interface. Correlation between the degree of straining and the corrosion-induced cracks at the end of 18 months of exposure has also been established.
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Data Availability Statement
Some or all data that support the findings of this study are available from the corresponding author upon reasonable request.
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Journal of Materials in Civil Engineering
Volume 33 • Issue 10 • October 2021
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© 2021 American Society of Civil Engineers.
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Received: Jul 21, 2020
Accepted: Mar 1, 2021
Published online: Jul 28, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 28, 2021
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