Portland cements are hydraulic binders composed primarily of hydraulic calcium silicates that set and harden by a chemical reaction with water called hydration.
When the paste ( cement , air , and water ) is added to aggregates ( sand and gravel , crushed stone, or other granular material), it acts as a glue and binds the aggregates together to form a stone-like mass, concrete , the most versatile and widely used man-made material in existence
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