1. Abstract Conservation of natural resources is the key requirement for maintaining an ecological balance. Thus, there is a need to find alternate construction materials. In that direction,the present experimental investigation is carried out to investigate the mechanical properties of Glass Fiber Reinforced Fly Ash Concrete with Fly Ash replacement of 0%, 20% and 40% by weight of cement and addition of Glass fibers of length 12mm and diameter 14 micron in four different volume fractions of

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... 0.5%, 1% and 1.5%. Compressive strength is measured by testing standard cubes (150mm x 150mm x 150mm) at the age of 7, 28 and 56 days. Flexural strength is measured by testing standard prisms (100mm x 100mm x 500mm) at the age of 28 and 56 days. Splitting tensile strength and Modulus of Elasticity is measured by testing standard cylinders (150mm dia x 300mm height) at the age of 28 and 56 days.