Effect of Particle Size of Residual Rice-Husk Ash in Consumption of
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 6
Abstract
Some researchers suggest the use of residual rice-husk ash (RHA) finely divided as a mineral addition to cement, despite the reduced content of amorphous silica compared to RHA produced by controlled burning. This article presents an investigation of the pozzolanic activity of residual RHA A and residual RHA B, with high and low contents of amorphous silica, respectively, showing different particle size distributions. Scanning electron microscopy (SEM), magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy, and determination of amorphous silica through the rapid analytical method were used for the microstructural characterization of the RHA samples. The RHA B with low content of amorphous silica increases the consumption of calcium hydroxide when its particle size decreases.
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Acknowledgments
The authors wish to acknowledge Furnas Centrais Elétricas, CAPES–Brazil, CNPq–Brazil, and ANEEL for extending financial support to this research.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 6 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 8, 2013
Accepted: May 28, 2014
Published online: Aug 12, 2014
Discussion open until: Jan 12, 2015
Published in print: Jun 1, 2015
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