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David

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aggregate

fine aggregate

Fine aggregate (sand).


coarse aggregate

Coarse aggregate (stone). Images: Sonag Ready Mix LLC.


Aggregate is a building material which is mixed with an adhesive such as cement to make concrete and mortar. Fine aggregate, usually sand or crushed stone, is used for smaller structural members where a smooth surface is required; coarse aggregate, such as pebbles or small angular stones, for larger members.