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In this study, Taguchi-Grey relational analysis was used to investigate and optimize the effect of ground granulated blast furnace slag (GGBS) replacement, water to geopolymer solids (W/GPS) ratio, molarity of NaOH solution, binder content and Na₂SiO₃ to NaOH solution ratio on setting time, workability and compressive strength of fly ash - GGBS based geopolymer concrete (GPC). After arriving at the optimal combination of mix parameters, verification experiments were conducted on the proposed optimized GPC mix with respect to fresh (setting time and workability) and hardened (compressive strength, flexural strength and splitting tensile strength) properties. The microstructural studies on selected fly ash-GGBS based GPC mixes at each GGBS replacement level and the proposed optimized GPC mix were conducted through X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and Field …