Influence of a Superplasticizer on Initial Corrosion of Galvanized Steel Bars in Concrete Pore Solution
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 6
Abstract
In this work, the influence of a naphthalene sulfonate–based superplasticizer on the initial corrosion of galvanized steel bars in the simulated concrete pore solution was studied. The initial corrosion process of the galvanized steel in solution with superplasticizer was first monitored. The inhibition effect of the protective layer formed by the superplasticizer and the protective property of the calcium hydroxyzincate (CHZ) passive layer were defined. Scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDS) was used to observe the surface morphology of the CHZ passive layer. The results showed that the addition of superplasticizer delayed the initiation of the corrosion process of galvanized steel bar and inhibited the hydrogen evolution. The protective property of the CHZ layer on galvanized steel varied with the concentration of superplasticizer. The inhibition effects of the superplasticizer on the initial corrosion will be beneficial to the quality of the steel–concrete interface.
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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
The authors gratefully acknowledge the financial support of Hong Kong Branch of the National Engineering Research Center for Steel Construction through Project 1-BBY6 and the Hong Kong Polytechnic University through Project 1-ZVGE. The last author also acknowledges the support of the National Science Fund for Distinguished Young Scholars (51525903).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 6 • June 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 11, 2020
Accepted: Oct 22, 2020
Published online: Mar 27, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 27, 2021
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