Concrete is usually cast in formwork, strong enough to withstand the pressure of fresh concrete (especially for self compacting concrete, see 11), locked enough to prevent the leakage of cement past, easily positioned and detachable. Fresh concrete should not be poured in formwork from high level but should be cast as near as possible to its final position, to avoid components segregation.
Ordinary concrete should always be compacted by vibration after casting, mainly to ensure the escape of unnecessary trapped air. Fresh concrete must be cured to ensure correct hydration and hardening.
