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Keywords: Normal conventional concrete has been widely used as a construction material throughout the world because of its advantages of high compressive strength, durability, workability, mould-ability, etc. The current global scenario shows increased construction of large and complex structures with heavy reinforcement and complicated shapes. Using normal concrete in such situation may often result in inadequate compaction, affecting performance and long-term durability of tructures. One solution for the achievement of durable concrete structures is the use of Self-Compacting Concrete (SCC). At present day Nanotechnology is one of the most active research areas which has wide applications in almost all the fields. So, in these project, improving SCC concrete properties by addition of nano-silica particles and compare the test results with conventional concrete. To study the Effect of nano-silica in the properties of self compacting concrete (SCC). SCC + Nano Silica. Conventional SCC (0% nano silica). In addition to that finding the mechanical properties (i.e. Compressive strength, Split-tensile strength, Flexural strength) were also evaluated. After evaluating the mechanical properties for the various mix andit is compared with the conventional concrete. Well dispersed nano particles increase the viscosity of the liquid phase, improves the segregation resistance and workability of the system. Accelerates the hydration. Better bond between aggregates and cement paste. Improves the toughness, shear, tensile strength and flexural strength of concrete. Keywords: Nano Silica, Self compacting concrete, compressive strength. I.INTRODUCTION Self-compacting concrete (SCC) was first developed inJapan (in the mid to late 1980s) as a means to create uniformity in the quality of concrete by controlling the ever present problem of insufficient compaction by a workforce that was losing skilled labor and by the increased complexity of designs and reinforcement details in modern structural members. Durability was the main concern and the purpose was to develop a concrete mix that would reduce or eliminate the need for vibration to achieve consolidation. The use of SCC concrete has been increasing in the United States also during the last 5 years. Currently the technology is being primarily applied to the precast industry. Other segments being targeted are flatwork, columns and wall construction. The applications of SCC are many, limited only by the industry's knowledge of it, ability to produce it and acceptance of it.The usual self-compacting concretes have compressive strengths in the range of 60-100N/mm². However Ultra High Performance Self-Compacting Concrete (UHPSCC) with strength about 150 N/mm²have also been successfully developed.The durability of cement concrete is defined as its ability to resist weathering action, chemical attack, abrasion or any other process of deterioration. Durable concrete will remain its original form, quality and serviceability when exposed to its environment.AhamadAskariet.al (2011)Anexperim...

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