blue metal or Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction

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blue metal or Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world.

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