Analysis of Cementitious Composites Prepared with Carbon Nanotubes and Nanofibers Synthesized Directly on Clinker and Silica Fume
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 6
Abstract
Cement pastes and mortars were prepared incorporating carbon nanotubes (CNTs) and nanofibers (CNFs) synthesized directly on ground clinker and silica fume. Setting times of the cement pastes were not significantly influenced by the presence of nanotubes and nanofibers. Mortar mechanical behavior (compressive and flexural tensile strength) was evaluated and compared with reference mortars having the same composition but without nanotubes and nanofibers. The mortars incorporating nanostructured clinker showed 5.4–14.1% higher compressive and flexural tensile strengths, respectively. The same values for the mortars prepared with nanostructured silica fume were 39.6 and 9.4%, respectively. Gas adsorption porosimetry and helium pycnometer analysis showed modification of the pore structure as an effect of nanostructured material addition: pore diameter decreased, specific surface area increased, yet density of the mortars remained unchanged.
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Acknowledgments
The authors are grateful for the financial and technical support received from Intercement Brasil, Fapemig, Capes/Procad, CNPq, INCT Nanomateriais de Carbono and Magnesita. The authors would like to acknowledge the Center of Microscopy at the Federal University of Minas Gerais (http://www.microscopia.ufmg.br) for providing the equipment and technical support for experiments involving electron microscopy. Pore structure analysis was performed in the Laboratory of Chemistry of Nanostructures situated at the National Center of Nuclear Technology Development (CDTN).
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 26, 2015
Accepted: Sep 27, 2016
Published ahead of print: Jan 23, 2017
Published online: Jan 24, 2017
Published in print: Jun 1, 2017
Discussion open until: Jun 24, 2017
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