Abstract : Cement, fine and coarse aggregate, and other key components of concrete are threatened with extinction in the near future due to overexploitation and inefficient use. Cement production also results in increased carbon dioxide emissions, which in turn have a significant role in driving up average temperatures around the world. New materials found by scientists can serve as a whole or partial replacement for traditional concrete. To lessen the negative effects on the environment, researchers are looking into using other solid leftovers from industries and farms in place of traditional concrete components. Using a mix design that called for 1% Nano alumina replacement with ground granulated blast furnace slag and 1% Polypropylene fibre, this study analysed the performance of M35 grade structural RC elements. Crack width and rate of deflection were some of the engineering metrics analysed. Analysing the data, we learned that using Nano alumina integrate with GGBS and Polypropylene in larger quantities in place of traditional concrete significantly improved the structural behaviour of an RC concrete part members in terms of Deflection resistance and crack width reduction.