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This study investigated the durability performance and microstructural changes of fly ash–ground granulated blast furnace slag (GGBS)-based geopolymer mortar (GPM) made with different sand-to-binder () ratios and subjected to sulfate and acid environments. The durability performance of GPM in terms of visual observation, change in weight, and change in compressive strength was investigated after exposure to 6% , 6% , , and solutions for a period of 26 weeks. The weight gain percentage of the GPM mixes exposed to sulfate solutions decreased with an increase in GGBS content, whereas the weight loss percentage of the mixes exposed to acid solutions increased with an increase in GGBS content and ratio. GPM made with lower GGBS content, i.e., 15%, had the maximum gain and the minimum loss in compressive strength when exposed to sulfate and acid solutions …