Effect of Fine Al-Containing Waste in Autoclaved-Aerated Concrete Incorporating Rice-Husk Ash
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 8
Abstract
This investigation is focused on the physical and mechanical properties, as well as the microstructure of autoclaved aerated concrete (AAC) incorporating both rice-husk ash (RHA) and aluminum (Al)–containing waste (AW) as a partial aggregate and expansive agent replacement. Normally, these wastes are disposed of in landfill and have low reactions at room temperature. Thus, the use of these wastes in AAC could reduce waste in the environment as well as reduce autoclaving time or temperature. The fineness of ground AW, analyzed by laser particle-size distribution, were classified as high (AWH), medium (AWM), and low (AWL), with the mean particle sizes of 9.71, 29.91, and 51.11 μm, respectively. The AW was used to substitute metallic aluminum powder at levels of 5, 10, 15, and 20% by weight. Samples with AW substitution gave lower unit weights and compressive strengths than the reference sample, except at 5% of AAC containing medium and low fineness. Scanning electron microscopy (SEM) micrographs reveal that at a higher replacement level and higher fineness of AW, fibrous calcium silicate hydrate (CSH) was formed instead of tobermorite, at 4-h autoclave curing.
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Acknowledgments
The authors would like to express to their gratitude to the Joint Graduate School of Energy and Environment (JGSEE), King Mongkut’s University of Technology Thonburi, Center of excellence on Energy Technology and Environment, Ministry of Education Thailand, and the National Research University Project of Thailand, the Office of the Higher Education Commission (Thailand) for financial support.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 8 • August 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 29, 2013
Accepted: Jun 23, 2014
Published online: Sep 26, 2014
Discussion open until: Feb 26, 2015
Published in print: Aug 1, 2015
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