Temperature-Induced Chemical Changes in Soundless Chemical Demolition Agents
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 7
Abstract
This paper explored the relationship between ambient temperature, calcium oxide (CaO) hydration, and calcium carbonate () generation in cold and moderate ambient temperatures (2°C–19°C). A total of 22 samples from 2 commercial soundless chemical demolition agents (SCDAs) were tested in steel pipes. The raw powder and materials resulting from hydration were subjected to X-ray diffraction analysis, derivative thermogravimetric analysis, and thermogravimetry analysis. Raw and hydrated specimens proved chemically distinctive. Experimental results showed that (1) the unconfined portions of hydrated specimens contained more due to carbonation of , and confined portions had higher concentrations; (2) all materials tested at 19°C ambient temperature had concentrations nearly 10% greater than those tested at 2°C; and (3) the higher concentrations formed at 19°C generated 350% greater expansive pressure than did those that formed at 2°C.
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Data Availability Statement
The raw and processed data required to reproduce these findings cannot be shared at this time due to technical or time limitations.
Acknowledgments
The authors thank Derek Holmes, lab technician, University College Dublin for his tireless efforts in the lab throughout the research, and C. Aspiotis for his contribution in XRD and TG experiments. This work was supported by Science Foundation Ireland (12/ERC/12534).
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 7 • July 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Apr 10, 2018
Accepted: Sep 20, 2018
Published online: Apr 25, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 25, 2019
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