Abstract-Self-compacting concrete (SCC) is a flowing concrete mixture that is able to consolidate under its own weight. The highly fluid nature of SCC makes it suitable for placing in difficult conditions and in sections with congested reinforcement. The objective of this study is to investigate the influence of partial replacement of natural river sand by quarry dust in different percentages and to study the effect of replacement of cement by fly ash in the preparation of self compacting concrete. Mix design of SCC with various dosages of quarry dust and fly ash was done for diffent cementitious content and the effect on fresh and hardened properties was studied. SCC trial made with flyash addition at 20% as a partial replacement with cement has shows similar results as that of trial with no flyash addition. Flyash addition around 50% has shows extended (more than 24 hours) setting time of concrete and compressive strengths are not conforming to even M20 grade requirements for the trial made with 400 kg/m3 of Cementitious content. In order to affect the advantage of flyash utilization there shall be a minimum of 30% flyash replacement for cement. Usage of quarry dust decreases workability and with the usage of admixtures the workability of the mix was well maintained. Key Words: Self compacting concrete, Quarry Dust, Fly Ash