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The effects of slag substitution (0, 30 and 60%) and chloride concentration (1.5 and 3.5% sodium chloride) on microstructural changes during strength development between 28 and 360 days, rebar corrosion up to 600 days and chloride binding capacity (CBC) in chloride-rich geopolymer concrete (GC) were investigated. The microstructural changes of the GC were evaluated through field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction and Fourier transform infrared spectroscopy analyses. The strength enhancement was higher for the GC mixes based on fly ash (FA) (F-GC mixes) than for the GC mixes based on FA and slag (F/S-GC mixes). The presence of chloride in the GC mixes caused a strength reduction at all ages, but the F/S-GC mixes with the higher slag content mostly showed a smaller strength reduction than the other mixes. Furthermore, the F/S-GC …