Editing Brick (section)

==== Concrete bricks ====
{{Main|Concrete masonry unit}}
[[File:Brickworks in Hainan - cement vessel, maker, stacker 01.jpg|thumb|A concrete brick-making assembly line in [[Guilinyang]] Town, Hainan, China. This operation produces a pallet containing 42 bricks, approximately every 30 seconds.]]

Bricks formed from [[concrete]] are usually termed as blocks or [[concrete masonry unit]], and are typically pale grey. They are made from a dry, small aggregate concrete which is formed in steel moulds by vibration and compaction in either an "egglayer" or static machine. The finished blocks are cured, rather than fired, using low-pressure steam. Concrete bricks and blocks are manufactured in a wide range of shapes, sizes and face treatments – a number of which simulate the appearance of clay bricks.

Concrete bricks are available in many colours and as an engineering brick made with sulfate-resisting Portland cement or equivalent. When made with adequate amount of cement they are suitable for harsh environments such as wet conditions and retaining walls. They are made to standards BS 6073, EN 771-3 or ASTM C55. Concrete bricks contract or shrink so they need movement joints every 5 to 6 metres, but are similar to other bricks of similar density in thermal and sound resistance and fire resistance.<ref name="EMS" />