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

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