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Aggregate (composite) facts for kids

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Concrete aggregate grinding
Grinding concrete exposes aggregate stones.

Aggregate is the component of a composite material that resists compressive stress and provides bulk to the composite material. For efficient filling, aggregate should be much smaller than the finished item, but have a wide variety of sizes. For example, the particles of stone used to make concrete typically include both sand and gravel.

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Aggregate (composite) Facts for Kids. Kiddle Encyclopedia.