Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 21, Issue 6, Pages 1295-1300Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2006.01.005
Keywords
fly ash; bricks; lime; sand; steam autoclave
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About 10 million tonnes of fly ash are produced yearly as waste from coal fired thermal power plants in Turkey. Only a small portion of this waste is utilized as a raw material in the production of cement and concrete. In this study, Seyitomer power plant fly ash was investigated in the production of light weight bricks. Fly ash, sand and hydrated lime mixtures were steam autoclaved under different test conditions to produce brick samples. An optimum raw material composition was found to be a mixture of 68% fly ash, 20%, sand and 12% hydrated lime. The optimum brick forming pressure was 20 MPa. The optimum autoclaving time and autoclaving pressure were found 6 It and 1.5 MPa, respectively. The compressive strength, unit volume weight, water absorption and thermal conductivity of the fly ash-sand-lime bricks obtained under optimum test conditions are 10.25 MPa, 1.14 g/cm(3), 40.5%, and 0.34 W m(-1) K-1 respectively. The results of this study suggested that it was possible to produce good quality light weight bricks from the fly ash of Seyitomer power plant. (c) 2006 Elsevier Ltd. All rights reserved.
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