This study examines the influence of the water-to-binder (w/b) ratio on the compressive strength and corrosion characteristics of reinforced geopolymer concrete (GPC), composed solely of Ground Granulated Blast Furnace Slag (GGBS). The cylindrical specimens were prepared for corrosion intensity measurement, whereas the cube specimens were prepared for compressive strength evaluation. Specimens for these experiments were prepared with water-to-binder ratios (w/b) of 0.45, 0.5, and 0.55, and immersed in sodium chloride (NaCl) solutions at concentrations of 0%, 3.5%, 5%, and 7.5%. The specimens were evaluated at different curing ages, specifically for compressive strength at 7 and 28 days, and for half-cell potential at 1, 7, and 150 days post-exposure. The experimental results indicated the influence of the water-to-binder (w/b) ratio, testing age, and NaCl exposure on geopolymer concrete. The results indicate that the GGBS-based GPC with a low water-to-binder ratio has attained superior compressive strength and minimal susceptibility to corrosion.