Mechanical Properties of Engineered Cementitious Composites Subjected to Elevated Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 10
Abstract
This paper presents the results of an extensive test program on the residual mechanical properties of engineered cementitious composites (ECC) exposed to elevated temperatures up to 800°C. ECC cube specimens were heated to four different target temperatures (200, 400, 600, and 800°C) in an electric furnace then kept at constant temperature for three time durations (0.5, 1, and 2 h). Two cooling schemes, quenching in water and cooling in air, were used to cool the specimens. The residual mechanical properties of the ECC specimens were then evaluated. The residual strength and stiffness generally decreased with the increasing temperature and heating duration, except for the 200°C temperature exposure. Compared to the compressive strength, the stiffness was affected much more significantly by the cooling scheme. For the specimens subjected to 800°C for 2 h of exposure, quenching in water facilitated the strength and stiffness recovery. The microstructural characterizations, which were performed both before and after the elevated temperature exposure using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP), effectively explained the observed postexposure mechanical properties of the ECC specimens.
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Acknowledgments
The authors are grateful for the financial support received from the Research Grants Council of the Hong Kong SAR (Project Code: PolyU 5143/11E) and the National Natural Science Foundation of China (NSFC, Project code: 51278441).
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 10 • October 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 24, 2014
Accepted: Nov 11, 2014
Published online: Dec 22, 2014
Discussion open until: May 22, 2015
Published in print: Oct 1, 2015
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