Ground granulated blast furnace slag (GGBS) is a pozzolanic material (termed by a few as a supplementary or complimentary cementitious material) which can be used as a cementitious ingredient in either cement or concrete composites. Slag is composed of calcium oxide (CaO), silica (SiO₂) and alumina (Al₂O₃). It is a by-product from steel mills.Along with GGBS, an agro-industrial waste product of sugar mills Bagasse Ash, which is a by-product obtained from burning of Bagasse for electricity generation. It has been recently been accepted as a pozzolanic material and can be used as a supplementary cementitious material in concrete. Although it is a pozzolanic material, much of this ash is still disposed in landfills everyday leading to environmental problems. A concrete mix of grade M₃₀ was investigated by keeping water-binder ratio as 0.36. In this thesis work, mechanical properties of the ternary concrete are reviewed by replacing OPC of 43 grade by 0%, 10%, 20%, 30% of maximum pozzolanic action giving proportion of the blend containing GGBS and Bagasse ash(40% Bagasse ash and 60% GGBS). This paper presents an experimental study on flexural strength of concrete after 28 days of curing.