Microstructural and Mineralogical Characterization of Artificially Produced Pellets for Civil Engineering Applications
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 2
Abstract
Most hazardous, industrial waste from thermal coal-fired power plants has found utilization opportunities in different civil engineering applications by various treatment operations in recent years. Such initiatives provide improvements in economy, environmental protection, and health safety. One of the techniques used in treatment of powdered wastes is to make pellets by pelletization discs. These artificial pellets are mainly used in many structural applications as aggregate in concrete, filling material for roads and foundations, drainage and infiltration material, and so on. In this study, artificially produced pellets from mixtures of fly ash, bentonite, and powdered window glass were sintered at different temperatures to obtain desirable properties. Microstructure of these sintered pellets were investigated in order to understand the changes due to the sintering agent type, content, and sintering temperature. For this purpose, thermal, mineralogical, and microstructural studies were performed. It was noted that sintering temperature and the type and amount of the sintering agent had a remarkable effect on the changes in the microstructure of the pellets. X-ray diffraction (XRD) patterns also showed that sintering produced new crystalline phases not found in the raw materials which was also detected in differential thermal analysis (DTA). Thus, the dissimilar sintering behavior is attributed to the combined effect of crystal structure, morphological characteristics, and oxide compositions of the powder materials used in the production of the pellets.
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Acknowledgments
The support of Bogazici University Research Fund is gratefully acknowledged through Project 07A402.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 2 • February 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 9, 2016
Accepted: Jun 28, 2016
Published online: Sep 2, 2016
Published in print: Feb 1, 2017
Discussion open until: Feb 2, 2017
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