Editing Brick (section)

==== Calcium-silicate bricks ====
[[File:Mexitegel.jpg|thumb|left|Swedish Mexitegel is a sand-lime or lime-cement brick.]]
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    NB: This is NOT related to the chemical compound "calcium silicate"
    These are bricks made from calcium compounds (lime) and silicate compounds (sand)
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Calcium-silicate bricks are also called sandlime or flintlime bricks, depending on their ingredients. Rather than being made with clay they are made with [[Lime (mineral)|lime]] binding the silicate material. The raw materials for calcium-silicate bricks include lime mixed in a proportion of about 1 to 10 with sand, [[quartz]], crushed [[flint]], or crushed siliceous rock together with mineral [[colourant]]s. The materials are mixed and left until the lime is completely hydrated; the mixture is then pressed into moulds and cured in an [[autoclave]] for three to fourteen hours to speed the chemical hardening.<ref name="EMS">McArthur, Hugh, and Duncan Spalding. ''Engineering materials science: properties, uses, degradation and remediation''. Chichester, U.K.: Horwood Pub., 2004. 194. Print.</ref> The finished bricks are very accurate and uniform, although the sharp [[arris]]es need careful handling to avoid damage to brick and bricklayer. The bricks can be made in a variety of colours; white, black, buff, and grey-blues are common, and pastel shades can be achieved. This type of brick is common in Sweden as well as Russia and other [[post-Soviet]] countries, especially in houses built or renovated in the 1970s. A version known as [[fly ash brick]]s, manufactured using [[fly ash]], lime, and gypsum (known as the FaL-G process) are common in South Asia. Calcium-silicate bricks are also manufactured in Canada and the United States, and meet the criteria set forth in ASTM C73 – 10 Standard Specification for Calcium Silicate Brick (Sand-Lime Brick).