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Construction aggregate, or simply "aggregate", is a broad category of coarse particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregat Aggregates are the .

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ASTM C-33 is considered washed concrete sand or manufactured sand that meets specific ASTM guidelines for concrete aggregates and/or the items that are added into the concrete in order to prepare it for use. C-33 is the particular grading, or size, of the material.

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Thus, the world's use of aggregates for concrete can be estimated at 25.9 billion to 29.6 billion tonnes a year for 2012 alone. This production represents enough concrete to build a wall 27 metres high by 27 metres wide around the equator.