Geopolymers are obtained by various methods in different alkaline environments by changing compositions and crystal structures of pozzolans, which have Al and Si oxide compounds in their structures and carry little or no hydraulic characteristics. In this study, mechanical and physical characteristics of geopolymer mortars manufactured with ground granulated blast furnace slag (GGBFS) and activated with sodium silicate (water glass) were determined and also their SEM-EDS analyses were performed. As a result of the study, it was determined that geopolymers prepared with GGBFS can also be used in the areas where blast furnace slag cement would be used.