Development and Evaluation of an Indigenous Natural Corrosion Inhibitor for Steel in Cementitious Systems
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 5
Abstract
This research developed and evaluated the corrosion-inhibiting efficiency of a natural inhibitor prepared from a bamboo tree [referred to as bamboo leaf extract (BLE)]. The corrosion behavior of steel in BLE-admixed cementitious systems was examined using dynamic-polarization tests and salt-fog tests. The effect of the addition of BLE on the workability and compressive strength of cementitious systems was studied using flow-table and compression tests on mortars. Increased concentration of BLE and the preimmersion period of steel in BLE-admixed pore solution resulted in the increase of corrosion potentials and the reduction of corrosion currents. Furthermore, the addition of BLE improved the workability and compressive strength of mortars, and the mass loss of steel in BLE-admixed mortar was observed to be less than that in the control (BLE-free) specimens. The inhibitor’s adsorption on the steel followed the Langmuir isotherm model, suggesting the formation of a protective layer at the steel–electrolyte interface, and accordingly, a 99% reduction of the corrosion current was achieved by preimmersing the steel in simulated concrete pore solution containing 700 ppm BLE for 7 days.
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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 thank Professor Kallol Mondal (Department of Materials Science and Engineering, IIT Kanpur) for extending his lab facilities for corrosion tests. His support and help are gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 5 • May 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jun 7, 2023
Accepted: Nov 6, 2023
Published online: Feb 26, 2024
Published in print: May 1, 2024
Discussion open until: Jul 26, 2024
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