Abstract: As we well known that, the world is developing rapidly and the construction of buildings takes vital role in this development. If we go through in detail the usage of concrete get raised up so it leads to the shortage of the natural resources. In order to save our natural resources we thought that replace some of the proportions in the concrete with the following measures.The study focuses on the compressive strength, split tensile strength, flexural strength performance of concrete containing steel fiber and different percentage of phosphogypsum as a partial replacement of cement. The cement in concrete is replaced accordingly with the percentage of 5%, 10%, 15%, 20% and 25% by weight of silica fume and 1% of steel fiber is added by weight of cement. Concrete cubes, cylinders and beams are tested at the age of 3, 7 and 28 days of curing. Finally the strength performance of slag blended fiber reinforced concrete is compared with the performance of conventional concrete.

Keywords: steel fiber, phosphogypsum, compressive strength, split tensile strength, flexural strength.

| DOI: 10.17148/IARJSET.2022.9626