Coarse aggregates are irregular broken stone or naturally-occurring rounded gravel used for making concrete. Materials which are large to be retained on 4.7 mm sieve size are called coarse aggregates, and its maximum size can be up to 63 mm.

Coarse aggregates are generally obtained by blasting in stone quarries or by breaking them by hand or by crushers. Machine - crushed stones consist of stones of various sizes whereas Hand - broken aggregates consist of only single size stones. To produce graded aggregates for high-class concrete, they are again mixed in specific proportions.

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