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Fly ash bricks. Fly ash brick (FAB) is a building material, specifically masonry units, containing class C or class F fly ash and water. Compressed at 28 MPa (272 atm) and cured for 24 hours in a 66 °C steam bath, then toughened with an air entrainment agent, the bricks can last for more than 100 freeze-thaw cycles.
One type of fly ash brick is manufactured by mixing fly ash with an equal amount of clay, then firing in a kiln at about 1000 °C. This approach has the principal benefit of reducing the amount of clay required. Another type of fly ash brick is made by mixing soil, plaster of Paris, fly ash and water, and allowing the mixture to dry.
A version known as fly ash bricks, 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).
Liu mixed the fly ash with water and applied 4,000 psi (28 MPa) of pressure. After two weeks, he found that the mixture had set into blocks with the strength of concrete. Owing to the high concentration of calcium oxide in fly ash, the bricks can be described as "self-cementing".
Fly ash sample containing ceramic cenospheres, magnified 40×. The process of burning coal in thermal power plants produces fly ash containing ceramic particles made largely of alumina and silica. They are produced at temperatures of 1,500 to 1,750 °C (2,730 to 3,180 °F) through complicated chemical and physical transformation.
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Cream City brick; D. Dutch brick; E. Engineering brick; F. Fareham red brick ... Niles Firebrick; Fire clay; Flemish bond; Fly ash brick; G. Glossary of British ...
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