In the field of construction, with the release of carbon-dioxide, the production of concrete leads to a negative impact on the environment. Therefore, there is a need to limit cement usage. One of the ways to reduce the cement content in concrete is using sisal fiber & micro silica as a partial alternative. Sisal fibers are one of the most popular alternatives for concrete reinforcement and are proven to show significant features including great tensile strength and sustainability. This paper aims to investigate the outcome of subsuming silica fume and sisal fiber in concrete which eventually solves the problems related to waste disposal and global warming and produces high performance concrete. The use of natural fibers & supplementary cementitious materials in concrete has gained a lot of attention from the past few years to their potential of increasing the durability and mechanical properties of concrete. In this study several cement mixtures were made with distinct proportions of sisal fiber & micro silica. The mechanical properties of the resulting concrete were then evaluated and compared with the normal concrete. Additions of silica fume into the concrete were 5% and10% by the weight of cement and volume of fractions of sisal fiber were 0.5% to 2%. Incorporation of silica fume improves the bond strength betweeen the particles of concrete where as sisal fiber bridges the cracks developed in the concrete by increasing the ductility and decreaing the brittleness and offers resistance to impact loading.

Silica fume, Bond strength, Mechanical properties, Subsuming ,Waste disposal, Concrete.