Efeito de nanotubos de carbono em matrizes de cimento Portland (Effect of carbon nanotubes on Portland cement matrices)
Author(s): |
Thiago Melanda Mendes
Marcelo Henrique Farias de Medeiros |
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Medium: | journal article |
Language(s): | Portuguese |
Published in: | Revista IBRACON de Estruturas e Materiais, 2023, n. 5, v. 16 |
DOI: | 10.1590/s1983-41952023000500008 |
Abstract: |
This study evaluates the effects of three carbon nanotubes with different geometric characteristics on the rheological behaviour and mechanical performance, as well as on the microstructure of mortars and cement pastes. For nanotube content ranging from 0.025 to 0.2 wt%, the yield stress and viscosity were determined by rotational rheometry, and mechanical performance was evaluated by flexural strength and dynamic modulus of elasticity. The microstructural analysis was performed by X-ray diffraction, thermo-gravimetric analysis and scanning electron microscopy (SEM). The obtained results showed that the yield stress presents a considerable increase as the carbon nanotube content increases. The viscosity was also influenced by the presence of carbon nanotubes. The flexural strength of mortars increases for different amounts of carbon nanotubes, and depending on the geometric characteristics of the carbon nanotubes, the material behaves like a composite. The microstructural analysis showed the nucleation of hydration products on the surface of the carbon nanotubes, and that the better mechanical performance of matrices containing carbon nanotubes is not related to the increase in hydration products. |
Copyright: | © 2023 Thiago Melanda Mendes, Marcelo Henrique Farias de Medeiros |
License: | This creative work has been published under the Creative Commons Attribution 4.0 International (CC-BY 4.0) license which allows copying, and redistribution as well as adaptation of the original work provided appropriate credit is given to the original author and the conditions of the license are met. |
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data sheet - Reference-ID
10715892 - Published on:
21/03/2023 - Last updated on:
10/05/2023