Cement is the major material used in concrete which produces approximately equal quantity of greenhouse gases. This makes the search for a more environmentally friendly material more relevant. So there is a need to produce a carbon dioxide emission free compendious material. Considering the increasing demand for developing alternative construction materials, due to the growing environmental concerns, this paper discusses the feasibility of alkali activated geo-polymer concrete, as a future construction material. Also to reduce the usage of river sand, M-Sand is preferred for fine aggregate replacement. Therefore Normal River sand is replaced partially such as 10%, 20%, 30%, 40% by Manufactured Sand. Here ambient curing of concrete at room temperature was adopted. So there will be no need of water for curing purpose. Optimum M-Sand content in compressive strength, tensile strength, flexural strength have to be determined. Rapid chloride penetration test and acid test are to be conducted to check the durability. Results are compared with conventional concrete.