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Evaluation of Carbon Nanotube Incorporation in Cementitious Composite Materials

1
Engineering and Mathematics, School of Computing, Engineering and Mathmatics, Western Sydney University, Sydney 2751, Australia
2
Department of Telecommunications Engineering, Universidade Federal Fluminese, Niterói 24.020-971, Brazil
3
Program de Engenharia Ambiental, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-901, Brazil
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(9), 1504; https://doi.org/10.3390/ma12091504
Received: 17 March 2019 / Revised: 15 April 2019 / Accepted: 15 April 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
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Abstract

Over the last decades, new materials with outstanding performance have been introduced in the construction industry. Considering these new technologies, it is worth mentioning that nanotechnology has revolutionized various areas of engineering. In the area of civil engineering and construction, cement is used for various purposes and the search to improve its performance has been receiving growing interest within the scientific community. The objective of this research was to evaluate the behavior of cement mortar produced by the addition of multi-walled carbon nanotubes (MWCNTs) in different concentrations by comparing their physical and mechanical properties with the properties of the nanotube-free composite. Motivated by the lack of consensus in the literature concerning to the optimal dosage of CNTs in cementitious matrices, three different carbon nanotube ratios, 0.20, 0.40 and 0.60 wt % Portland cement, were investigated with the aim of evaluating the mechanical properties. Destructive tests were carried out to determine the compressive strength, flexural strength and split tensile strength. Additionally, a non-destructive test was performed to determine the dynamic elastic modulus and density. Scanning electron microscopy (SEM) images showed the interaction between the MWCNTs and the hydration products of Portland cement mortar. The results indicated the potential contribution of 0.40 wt % cement CNTs to the enhancement of the mechanical properties of the cement composite as a promising construction material. View Full-Text
Keywords: cementitious materials; carbon nanotubes; compressive strength; non-destructive test; SEM cementitious materials; carbon nanotubes; compressive strength; non-destructive test; SEM
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Evangelista, A.C.J.; de Morais, J.F.; Tam, V.; Soomro, M.; Di Gregorio, L.T.; Haddad, A.N. Evaluation of Carbon Nanotube Incorporation in Cementitious Composite Materials. Materials 2019, 12, 1504.

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