Performance and Microstructure of Carbonated MgO Samples under High Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 3
Abstract
This study investigated the changes in the performance and microstructure of carbonated MgO samples subjected to 40°C–550°C in water, oven, and furnace conditions. Although sample strength remained relatively stable until 80°C, an obvious reduction was observed in higher temperatures. This performance decline was attributed to the changes in the content and morphology of the strength providing carbonate phases (hydromagnesite). Phase quantification results revealed lower hydromagnesite content with smaller crystal sizes at . The decarbonation of hydromagnesite, followed by dehydration of brucite to MgO at higher temperatures of 550°C, revealed the relationship between the stability of major phases and sample performance.
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Acknowledgments
The authors would like to acknowledge the financial support from the Singapore MOE Academic Research Fund Tier 1 (RG 95/16) for the completion of this research project.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 3 • March 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 25, 2018
Accepted: Aug 30, 2018
Published online: Jan 2, 2019
Published in print: Mar 1, 2019
Discussion open until: Jun 2, 2019
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