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There are two
ways in which compounds of cement can react with water.
One of these ways is direct
addition of some molecules of water. This is a true reaction of
hydration.
Another way is a chemical reaction or process
in
which a chemical compound reacts with water. This is called Hydrolysis.
It is convenient and usual, however, to apply the term
hydration to all reactions of cement with water, i.e. to both true hydration
& hydrolysis.
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