The scarcity of natural sand necessitates the use of alternate materials to replace it. This experiment investigates manufactured sand, a readily sourced industrial by - products waste material in India, as an alternative to natural sand, which is traditionally utilized as fine aggregate in concrete construction. In this present work the attempt has been made to study the effect of manufactured sand by partially replacing fine aggregate in concrete with addition of steel fibre and also polypropylene fibre separately. Strength properties such as compressive (7& 28 days) and tensile strength (28 days) along with fresh concrete properties; workability is determined. This test carried on referral concrete of grade M35; the concrete mixes were made using Portland pozzolana cement, and also replacing fine aggregate by 15, 30, 45, 60 and 75 percent of manufactured sand. After optimization of percentage replacement of fine aggregate by M-sand, further we made concrete Mixes using steel fibres at rate of 0.50, 0.75, 1 and 1.25 percent and also concrete mixes were made with polypropylene fibre at rate of 0.5kg/m 3 , 1kg/m3 , 1.5kg/m3 , 2 kg/m3 and various mechanical properties were investigated. The result concluded that M-sand is suitably replace the natural river sand at optimum limit and addition of fibre reinforcement also improves the compressive, flexural and tensile strength of concrete specimens however addition of polypropylene fibre and steel adversely affect the workability.

Concrete is one of the most versatile and widely used material in the construction sector. With the development and advancements of concrete, Civil engineering has reached its technological pinnacle. Despite its global and excessive demands, the consumption of cement is increasing day by day which is to be managed. Also there are many challenges related to its consistent strength performance , Abrasion resistance, Durability etc. so there is a great need to overcome these problems by the application of a pozzolanic admixture known as Fly ash which is responsible for improving various mechanical properties of concrete such as Abrasion Resistance and strength aspects and also reducing the consumption of cement at the same time. In this experimental Work, the Inclusion of Fly Ash and its effect on the various mechanical properties of the concrete i.e. Abrasion resistance, compressive strength, split tensile strength and flexural strength etc is investigated. The present investigation is carried on M35 Grade concrete. Firstly, concrete mixes is prepared by using Ordinary Portland cement( OPC 53) as a reference concrete mix and then blended concrete mixes is prepared by partial replacement of cement using fly ash in range of 10%, 20%, 30%, 40%, 45% by the weight of cement. This experimental study is carried for Determining the differences in the various mechanical properties of blended concrete (Fly ash and cement) and conventional concrete. The optimum percentage of using fly ash with cement in the concrete mixes is determined. The various parameters studies of concrete investigated are Abrasion resistance , workability of freshly prepared concrete mixes, compressive strength at 7 and 28 days, split tensile strength at 28 days. All these tests on concrete mixes is to be performed for both conventional concrete mixes (using only OPC) and also with blended concrete mixes ( OPC and its partial replacements with fly ash).