Why does concrete get hard ?

Concrete solidifies and hardens after mixing and placement due to a chemical process known as hydration. The water reacts with the cement, which hardens, bonding the other components together and eventually creating a stone-like material.
Hydration is an inorganic chemical reaction where water is added to the crystal structure of a mineral, usually creating a new mineral
The water evaporates and the cement adheres to itself. It kind of turns into rock.

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