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A pallet of "8-inch" concrete blocks An interior wall of painted concrete blocks Concrete masonry blocks A building constructed with concrete masonry blocks. A concrete block, also known as a cinder block in North American English, breeze block in British English, concrete masonry unit (CMU), or by various other terms, is a standard-size rectangular block used in building construction.
The overall embodied energy of concrete at roughly 1 to 1.5 megajoules per kilogram is therefore lower than for many structural and construction materials. [112] Once in place, concrete offers a great energy efficiency over the lifetime of a building. [113] Concrete walls leak air far less than those made of wood frames. [114]
Sandcrete is usually used as hollow rectangular blocks similar to concrete masonry units, often 45 centimetres (18 in) wide, 15 centimetres (5.9 in) thick, and 30 centimetres (12 in) with hollows that run from top to bottom and occupy around one third of the volume of the block. The blocks are joined together with mortar.
Concrete has a very low coefficient of thermal expansion, and as it matures concrete shrinks. All concrete structures will crack to some extent, due to shrinkage and tension. Concrete which is subjected to long-duration forces is prone to creep. The density of concrete varies, but is around 2,400 kilograms per cubic metre (150 lb/cu ft). [1]
Ecology blocks are manufactured using concrete left over from other construction processes. A cross-section of an eco-block typically measures 2 feet (61 cm) square, with block lengths ranging from 3 feet (91 cm) to 6 feet (180 cm). One block weighs between 1,800 pounds (820 kg) and 4,000 pounds (1,800 kg). [1]
1 William Street is a 6,778-square-metre (72,960 sq ft) site, owned by the Queensland Government, and from 1982 until 2013 it was used as a government car park. The site encompasses a whole city block between William , Alice and Margaret streets and Riverside Expressway .
A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Steel- reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving ( see below ).
House on a block in Adelaide, South Australia. In Australian and New Zealand English, a quarter acre is a term for a suburban plot of land. Traditionally, Australians and New Zealanders aspired to own a 3- or 4-bedroom house or bungalow on a section of around a quarter of an acre (about 1,000 square metres), also known locally as the Australian Dream or the New Zealand dream.