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Construction for Landscape Architecture by Jamie Liversedge, Robert Holden

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Materials used in making bricks

The main materials used in the manufacture of bricks are:

Clay An alluvial deposit found in lowland areas. There are three main types:

  • strong or pure clays with a natural moisture content which renders them plastic, and therefore suitable for hand molding;
  • sandy clays, which contain silica and shrink less; and
  • calcareous clays with lime, which make good bricks varying from pink to dark red.

Calcium silicate These bricks are made from a mix of hydrated lime and water and silica sand (or crushed flint), which is pressed into shape and then pressure-steam baked in an autoclave to produce a dull, white, and very regular brick. In 1877, the German chemist Dr Wilhelm Michaëlis first produced "artificial sandstone" ...

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