Microstructure of Calcium Carbide Residue–Ground Fly Ash Paste
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 3
Abstract
Microstructures of calcium carbide residue (CCR) and CCR–ground fly ash (CCR-GFA) pastes were examined. A ratio of CCR to GFA of 30 to 70 by weight was used as a binder without portland cement. CCR-GFA pastes with three different water-to-binder (W/B) ratios of 0.3, 0.4, and 0.5 were prepared. Scanning electron microscopy (SEM) was used to study the morphology of the CCR-GFA pastes. X-ray diffractometry (XRD) and Fourier transform infrared (FTIR) spectroscopy were used to provide fundamental information about the specimens. Microstructures of CCR-GFA pastes were studied at 60 days. The compressive strengths of CCR-GFA pastes were determined at 7, 14, 28, 42, and 60 days. The morphology of CCR-GFA paste was composed of gelatinous particles of different sizes. The fracture surface was inhomogeneous with rough textures. Calcium silicate hydrate (CSH) product as was found in all CCR-GFA pastes. This new compound was also found by FTIR analysis at wavelengths of 435 and . Results from this work illustrate that the formation of CSH products is most likely the reaction of from GFA, and from CCR. This chemical reaction is possibly similar to the pozzolanic reaction. The compressive strengths of all samples increased with age and were almost constant after 42 days.
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Acknowledgments
The writers gratefully acknowledge the financial support from the Thailand Research Fund (TRF) under TRF Senior Research Scholar, Contract No. UNSPECIFIEDRTA5080020, and the Commission on Higher Education, Ministry of Education, Thailand.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 3 • March 2011
Pages: 298 - 304
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 3, 2009
Accepted: Aug 16, 2010
Published online: Sep 17, 2010
Published in print: Mar 1, 2011
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