Quantitative XRD Analysis of Binary Blends of Siliceous Fly Ash and Hydrated Cement
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 8
Abstract
Quantitative analysis of the amorphous phase in binary blends of siliceous fly ash and hydrated cement is presented using the Partial Or No Known Crystal Structure (PONKCS) method. In binary blends, the total amorphous phase contains contributions from the glassy phase in fly ash and amorphous components of hydrated cement. A single pseudo-Voigt function is found to adequately fit the broad hump in the X-ray diffraction pattern resulting from diffuse scattering produced by the glassy phase in siliceous fly ash. The weight fractions of the amorphous component of hydrated cement and the glassy phase of siliceous fly ash in a binary blend are determined using the fitted profiles for the X-ray diffraction (XRD) patterns. For low lime content of less than 5%, the peak characteristics of the fitted function for the broad hump in the XRD pattern of fly ash are nominally identical for different oxide compositions of the glassy phase. The PONKCS method is shown to provide good accuracy in determining siliceous fly ash content in binary blends.
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Acknowledgments
The authors would like to acknowledge support of the Center of Excellence in Sustainable Development at I.I.T. Hyderabad.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 8 • August 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 9, 2015
Accepted: Nov 24, 2015
Published online: Feb 12, 2016
Discussion open until: Jul 12, 2016
Published in print: Aug 1, 2016
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