GGBS use has been studied extensively. It focused on replacing cement with GGBS, but producing artificial aggregates with GGBS helps use slag in concrete. This large-scale use reduces environmental pollution and depletes natural resources. This paper discusses geopolymer aggregate manufacturing. The study shows that geopolymer aggregate can be used as aggregate replacement material in concrete. Strength and density of concrete made with geopolymer aggregate and natural gravel were also studied. It confirming geopolymer aggregate increase mechanical properties of conventional concrete.