Concrete can be frustratingly deceptive. When it hardens after it is poured—through a curing process that occurs relatively quickly—concrete’s solid appearance can give the mistaken impression that it is dry. But looks can be deceiving!
The fact is this: concrete requires a substantial amount of water in the initial mix if it is to take on its characteristic strength, hardness and durability. And while concrete undergoes a drying process over time, it always retains some water.