A concrete that places itself? Self-compacting concrete (SCC), or self-consolidating concrete, as some prefer to call it, comes close to doing just that. Well-proportioned SCC can flow under its own weight through and around congested reinforcement, filling forms completely and producing a void-free mass with little or no mechanical vibration. Don't confuse it with the other "flowing" concretes that are subject to segregation problems and require vibration to achieve compaction.