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Chloride attack is an important aspect in long-term mechanical and durability performance of geopolymer concrete (GPC) in marine environment. Keeping this in view, in this study, the effect of chloride ions on compressive strength at different ages were investigated, as well as the microstructural changes in terms of molar ratio and morphology of GPC mixes. Two types of GPC mixes were prepared; the first one using 100% fly ash (FA_GPC), developed under elevated curing temperature at 80 °C for 48 h, and the other one using a blend of 85% fly ash and 15% ground granulated blast furnace slag (GGBS) (FAS_GPC), developed under ambient condition. To investigate the effect of chloride ions, sodium chloride (NaCl) was added at 0%, 1.5%, and 3.5% by mass of geopolymer solids during the preparation of GPC mixes. From the test results, it is observed that the FAS_GPC exhibited lower strength as compared to FA …