“Improvement in Shear Strength of R.C. Deep Beams with Addition of Steel Fiber, Metakaolin and Marble Dust in Concrete’’

Abstract

Conventional concrete deep beams are weak in tension, which results in low tensile strength, shear strength and brittle failure of these beams. In order to overcome these problems, the present work focuses on use of  metakaolin, marble dust and steel fibers in concrete mix. Metakaolin can reduce cement content. Metakaolin, marble dust and fibers play an important role in improvement of concrete's flexural tensile strength, impact resistance and split tensile of concrete. This combination is used to improve shear strength of deep beams, in the present study. Partial replacement of cement has been made from 3% to 20% with Metakaolin and Marble dust and 0.5% to 2% of steel fibers are added by volume of concrete. Experimental results of M20 grade of concrete are presented. Test results show that combination of these materials boosts split tensile strength, impact strength and shear strength of R.C.deep beams.