Effect of Sodium Nitrite as Corrosion Inhibitor against Chloride-Induced Corrosion of Steel Rebar in Geopolymer Concrete Containing Fly Ash and GGBS
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 4
Abstract
This study investigated the effectiveness of sodium nitrite () as a corrosion inhibitor against chloride-induced steel rebar corrosion in fly ash–ground granulated blast furnace slag (GGBS)–based geopolymer concrete (GPC). The GPC was prepared with two different blends of fly ash and GGBS and two different molarities of sodium hydroxide solution. Sodium chloride (NaCl) and sodium nitrite () were admixed in the GPC mix during preparation. The effectiveness of against chloride-induced corrosion in GPC mixes was evaluated through corrosion measurements. The microstructure of GPC in the presence of NaCl and was studied through X-ray diffraction (XRD) analysis and energy-dispersive X-ray spectroscopy (EDS) analysis. The obtained results showed that NaCl decreased the workability, whereas improved the workability of the GPC mix with a significant effect at higher dosages. The reduced the compressive strength of GPC with more effects at higher dosages. However, the retarding effect of on strength development decreased with age. The addition of in chloride admixed GPC lowered the probability of occurrence of corrosion and the corrosion current density of steel rebar. The inhibiting efficiency of against chloride-induced rebar corrosion in GPC was enhanced with an increase in its dosage. Furthermore, the inhibiting efficiency of decreased with age. However, the reduction with age was significantly less at a higher dosage. The variation in compressive strength of GPC in the presence of NaCl and is in line with the variation in the formation of N-(C)-A-S-H and N-A-S-H type gels as observed from the XRD analysis.
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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 are grateful to the Central Instruments Facility (CIF) of the Indian Institute of Technology (IIT) Guwahati for providing the research facility to carry out the XRD analysis and EDS analysis.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 4 • April 2022
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© 2022 American Society of Civil Engineers.
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Received: Mar 28, 2021
Accepted: Aug 13, 2021
Published online: Jan 18, 2022
Published in print: Apr 1, 2022
Discussion open until: Jun 18, 2022
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