Stones collected from a quarry are the most widely used coarse aggregate in construction. As a result of the intensive use of natural resources, the need for coarse aggregate in the building sector has expanded. It has required research into alternate building materials. The goal of this study is to identify an alternate coarse aggregate material utilising Ground Granulated Blast Furnace Slag (GGBS) clinker and to assess the hardened characteristics of non-conventional aggregate concrete in M25 grade. Durability qualities such as water absorption, sorptivity, acid resistance, and sulphate resistance were also assessed to assure the reliability of its use in harsh situations. Overall, this study's geopolymer aggregate concrete has the potential to be used as lightweight coarse aggregate in concrete