Christian McArdle wrote:

Concrete doesn't "dry". It sets. It actually needs water to set properly.
Removing the water by overdrying will actually slow down the setting process
(sometimes so much that it never completes) and damage the floor.

Hence there are circumstances where it is advisable to "water" new
concrete. e.g. using a sprinkler on a concrete drive in hot weather.
(after it has initially set hard enough not to wash away of course.)

One early form of cement was known as "hydrolic lime" because it would
set underwater.