Self compacting concrete (SCC) is a new category of high performance concrete which flows under its own weight. It does not require any external vibration and compaction. The work focused on concrete mixes having water/cement ratios of 0.25, with a packing factor of 1.12. The Concrete mixes contains constant proportions of Super plasticizers, and constant proportions of Cement, Micro Silica, VMA, Coarse aggregate and Fine aggregate for a constant water cement ratios. The percentage of Micro Silica added is 7% for all mixes. The mix proportions are obtained on the basis of NAN-SU mix design. The mixes contain Cement of 574 kg/m3 for 0% addition of fly ash, it vary for 5%, 10% &15% addition but with same total binder content. The workability tests performed in this research were as per EFNARC specifications. Based upon the experimental results, for a water cement ratio of 0.25, fresh and hardened state properties of high strength self-compacting concrete are evaluated. Due to so many advantages of this concrete, it is suitable for the situations where congested reinforcement is used. In this paper presents self compacting concrete is developed using various percentages of fly ash 0%, 5%, 10%, 15% by weight of cement as partial replacement of cement and the strength of concrete has been assessed.