The atmost issue related to excess consumption of cement is the emission of CO2 and other greenhouse gases ultimately leading to environmental degradation. Global warming being the need of hour and which in turn has made the world’s industrialists to make efforts underway to enhance eco-friendly construction materials, conserving the rapid exhaust of natural non-renewables. A study reveals, the annual emission rate of carbonate burns in cement industries contributes around five to eight percent of the world’s greenhouse gas emissions and also it has become the second largest consumable next to water. Assessing the current scenario, polymer based concrete, Geopolymer concrete (GPC) is a latest innovation in the construction sector and an environment friendly construction material obtainedas a result of polymerization chainreaction of inorganic molecules. Also, demand for river sand has gone in great hike and ultimately become costlier and scarce in availability on account of various acts and legislations confronting illegal dredging of the same. Environmental & economy aspects are better obtained, if locally available sources can be used, which aids in minimizing the cost. In such a case the manufactured sand (MS) is an economic alternative to river sand in concrete. The ultimate objective of this thesis paper is to assess the properties of flyash based Geopolymer concrete by using manufactured sand as fine aggregate. © 2019 Elsevier Ltd. All rights reserved.