What is self-compacting concrete (SCC) and when is it used?

Self-compacting concrete flows under its own weight to completely fill formwork and encapsulate reinforcement without vibration. Key properties include: high fluidity (slump flow 650-800mm), passing ability through congested reinforcement, and resistance to segregation. Mix design uses high powder content, viscosity-modifying agents, and superplasticizers. SCC is used in congested reinforcement situations, complex formwork, precast production, repair work, and where noise from vibration must be avoided.