This document presents an experimental study on the mechanical properties of self-compacting concrete (SCC) with the addition of polypropylene fiber and partial replacement of cement with cashew nut shell ash (CNSA). CNSA was used to replace cement at levels of 5%, 10%, 15%, and 20% and polypropylene fiber was added at 1%. Cubes and cylinders were cast and tested for compressive and split tensile strength at 7 and 28 days. Test results showed that the mix with 10% CNSA replacement and 1% polypropylene fiber addition achieved the highest strengths, exceeding that of the control mix without additions. Therefore, this mix was determined to be the optimum mix proportion studied