How does mixing water and cement change their properties?

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The water reacts chemically with the cement to make new crystals.
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What happens when water is mixed with cement?

When water is mixed with cement the following action takes place, . Evolution of heat . Hydration of cement . Finally hydrated particles will be formed which give strength

Is mixing cement a chemical or physical change?

Actually both physical and chemical changes are happening duringcement mixing.

Can you mix portland cement with just water?

Yes. Read the instructions. ANS 2 - You can, but it has limited uses as it gets quite brittle.

Cement mixed with sand and water makes?

Cement mixed with sand and water makes mortar.

What sort of change takes place when cement powder is mixed with water?

Short Answer: When adding water to cement a chemical reaction called hydration takes place, transforming the calcium and silicates into new mineral forms through an exotherm