期刊
CEMENT & CONCRETE COMPOSITES
卷 55, 期 -, 页码 11-16出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2014.07.021
关键词
Aerated concrete; Rice husk ash; Compressive strength; Microstructure
资金
- Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi
- Center of Excellent on Energy Technology and Environment, Ministry of Education Thailand
- National Research University Project of Thailand, The office of The Higher Education Commission (Thailand)
This study examines the effects of rice husk ash (RHA) on the physical, mechanical and microstructural properties of autoclaved aerated concrete (AAC) produced at a temperature of 180 degrees C for 8 h and 18 h. The RHA was used as an aggregate at various replacement ratios. The results demonstrated that RHA substitution for sand reduces compressive strength and unit weight. In terms of the microstructure, the highly reactive silica in RHA strongly affected the tobermorite transformation. At 8 h of autoclaving time, the lath-like and plate-like tobermorite formed in mixtures containing up to 50% RHA was replaced by a glass-like, silica-rich CSH structure at increased replacement ratios. However, extended processing had no significant effect on these properties, which indicates that the substitution of RHA for sand has a tendency to reduce the autoclaving time or autoclaving temperature required. (C) 2014 Elsevier Ltd. All rights reserved.
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