Repair Mortars Incorporating Multiwalled Carbon Nanotubes: Shrinkage and Sodium Sulfate Attack
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 12
Abstract
This study investigates the effect of multiwalled carbon nanotubes (MWCNTs) on the shrinkage and expansion caused by sodium sulfate attack in repair mortars; repair mortar behavior in the fresh state and the compressive strength are also measured. Three repair mortars are studied: 0.0% MWCNTs (reference), mortar from two different manufacturers. Shrinkage and sulfate attacks are evaluated according to current standards. The carbon nanotube increases the compressive strength by approximately 19.5% and decreases the fluidity. Shrinkage occurs more intensely in MWCNT-embedded mortars, although results show similar behavior between the two types of MWCNTs. The MWCNTs increase the expansion due to attack by sodium sulfate, indicating that this material may be harmful when the cementitious composite is in contact with these aggressive agents (sodium sulfate).
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Acknowledgments
The authors thank the Federal University of Parana (UFPR) and from Araucaria Foundation for the financial support for developing this research. In addition, they are grateful for the award of scholarships sponsored by the National Council for Scientific and Technological Development (CNPq).
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 12 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 7, 2016
Accepted: Jun 9, 2017
Published online: Oct 12, 2017
Published in print: Dec 1, 2017
Discussion open until: Mar 12, 2018
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