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Expanded clay aggregate
Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a light weight aggregate made by heating clay to around in a rotary kiln. The yielding gases expand the clay by thousands of small bubbles forming during heating producing a honeycomb structure. LECA has an approximately round or potato shape due to circular movement in the kiln, and is available in different sizes and densities. LECA is used to make lightweight concrete products and other uses.
==History==
LECA was developed about 1917 in Kansas City, Missouri, to the production in a rotary kin of a patented expanded aggregate known as Haydite which was used in the construction of USS Selma, an ocean-going ship launched in 1919. Following in the USA was the development of a series of aggregates known as Gravelite, Perlite, Rocklite, etc. In Europe, LECA commenced in Denmark, Germany, Holland (Netherlands), UK and Middle East.
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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