Concrete is a site prepared material used in multistory buildings, bridges, dams, and pavements. This material is a manmade composite rock composed of aggregates bonded together with cement that hardens over time. These concrete structures are of economic importance and connect peoples and materials for the prosperity of the nation. These structures needed to be protected against fire for reasonable amount of time to save people and materials are need of the day. For a better understanding of the behavior of concrete under thermal conditions, the present investigation aims to study the M25 strength of Fly-Ash concrete