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Abstract
Concrete is the construction material of the highest exigency which, in turn, created a huge demand for ordinary Portland cement (OPC) as an essential binder. Lamentably, its current production process is not only highly energy-intensive and happens to be at elevated temperature for Calcination of Limestones to takes place but it also liberates embodied anthropogenic Carbon Dioxide (CO2), a primary Green House Gas (GHG), answerable to global warming and pollution of earth’s environment. Not only that, it is user-hostile and comparatively costly too. Therefore, construction and infrastructure industries are looking at concrete researchers to invent alternative, new-fangled, user and environmentally-compassionate durable, sustainable and desirably cost-effective edifice materials and binders. Nowadays, Geopolymer technology has emerged out as a brilliant possible substitute to conventional OPC-system whereby Geopolymer composites and binders are being synthesized by activating alkali solution with Silica and Alumina rich pozzolanic material such as Fly ash, through the process of Geopolymerization analogous to geo-synthesis of natural rocks. The aim of the current review is to investigate the micro-structure performance of geopolymer concrete with 100% substitution of cement with waste materials, i.e., in the absolute absence of cement.