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Fly ash brick
thumbnailFly ash brick (FAB) is a building material, specifically masonry units, containing fly ash and water. Compressed at and cured for in a steam bath, then toughened with an air entrainment agent, the bricks last for more than cycles. Owing to the high concentration of calcium oxide in fly ash, the brick is described as "self-cementing". The manufacturing method saves energy, reduces mercury pollution, and costs 20% less than traditional clay brick manufacturing.
== The raw materials ==
The raw materials for fly ash Acc Blocks are:
Fly ash bricks are lighter than clay bricks.
Main ingredients include fly ash, water, quicklime or lime sludge, cement, aluminum powder and gypsum. The block hardness is being achieved by cement strength, and instant curing mechanism by autoclaving. Gypsum acts as a long term strength gainer. The chemical reaction due to the aluminum paste provides AAC its distinct porous structure, lightness, and insulation properties, completely different compared to other lightweight concrete materials. The finished product is a lighter Block - less than 40% the weight of conventional Bricks, while providing the similar strengths. The specific gravity stays around 0.6 to 0.65. This is one single most USP of the AAC blocks, because by using these blocks in structural buildings, the builder saves around 30 to 35 % of structural steel, and concrete, as these blocks reduce the dead load on the building significantly
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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