Geopolymer Concrete (GPC) is the most promising and novel concreting technology which primarily focuses on the eco-friendly aspects. In this work, the mechanical properties of fly-ash based GPC which includes compressive strength, split tensile strength and non-destructive testing methods like UPV and rebound hammer tests results will be examined and analyzed based on the different mix parameters for 8 mixes. The main varying parameters of the mix are alkaline solution ratio and concentration and binder proportions. Based on the optimum mix from 8 normal GPC mixes, one mix will be studied under the granite powder replacement. The granite powder is utilized for the partial replacement of binder for the 5%, 10%, 15%, and 20% of the binder volume. The concrete cube specimens are casted according to Indian standards and the 7th and 28th days strength are used for the analysis. © Blue Eyes Intelligence Engineering & Sciences Publication.