Performance Evaluation of Self-Compacting Concrete using PPC and Flyash

India, as the world's second-largest consumer of concrete, faces an urgent need for sustainable construction practices to address the environmental challenges of cement production and its eventual scarcity. This research investigates the effect of fly ash (FA) as a partial replacement for cement in self-compacting concrete (SCC) across various grades (M30, M50, M70), focusing on both fresh and hardened properties. The study explores the impact of fly ash content (ranging from 0% to 50%) on workability, compressive strength, split tensile strength, and flexural strength. Fresh properties were evaluated through slump flow, V-funnel, L-box, and J-ring tests, demonstrating that fly ash enhances flowability, passing ability, and filling ability up to 30% replacement. However, higher FA content negatively impacted the fresh properties, particularly in lower-grade mixes. In terms of hardened properties, compressive, split tensile, and flexural strengths improved up to 20-30% fly ash, attributed to its pozzolanic reaction and better particle packing. Beyond these levels, strength reduced due to increased paste viscosity and cement dilution. Overall, the research emphasizes the need for optimal fly ash content to maximize strength, workability, and durability in SCC applications