The use of Portland cement in concrete construction is under critical review due to a high amount of carbon dioxide gas released to the atmosphere during the production of cement. From few years, attempts to increase the utilization of fly ash to partially replace the use of Portland cement in concrete are gathering momentum. Geopolymer concrete is a ‘new’ material that does not need the presence of Portland cement as a binder. Instead, the source of materials such as fly ash, metakaolin that are rich in Silicon (Si) and Aluminium (Al) are activated by alkaline liquids to produce the binder. Hence concrete with no Portland cement. This study reports the details of the development of the process of making low calcium based fly ash and Metakaolin-based geopolymer concrete. In the present experimental study, attempts are made to study on the various strength properties like compressive strength, split tensile strength, an also durability properties like initial surface absorption test on Geopolymer concrete made up of fly ash and Metakaolin. ISAT test was held on long-term durability properties of Geopolymer concrete. Experiments were conducted on Geopolymer Concrete with different percentages of metakaolin and molarity of alkaline activator. Studies were made on the residual compressive strength of Geopolymer Concrete mixes. It was observed that as the addition of Metakaolin to control the concrete mix of fly ash increases, the workability of the concrete mix was found to decrease as compared to Fly ash based control mix. It is observed from the experimental results and its analysis, that compressive and splitting tensile strength of geopolymer concrete increases with using high molarity NaOH solution and 25 to 50 percent Metakaolin. The replacement of fly ash up to this percentage shows 10 to 12% increment in Compressive strength and 28 to 34% increment in the split tensile strength of geopolymer concrete at 28 and 90 days respective