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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 …