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concrete masonry unit
A concrete masonry unit (CMU) – also called concrete brick, concrete block, cement block, besser block, breeze block and cinder block – is a large rectangular block used in building construction.
==Composition==
Concrete blocks are made from cast concrete, e.g. Portland cement and aggregate, usually sand and fine gravel for high-density blocks. Lower density blocks may use industrial wastes as an aggregate. Lightweight blocks can also be produced using aerated concrete.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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