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Article

Development of a Novel Multifunctional Cementitious-Based Geocomposite by the Contribution of CNT and GNP

1
Department of Civil Engineering, ISISE, University of Minho, 4800-058 Guimarães, Portugal
2
Department of Mechanical Engineering, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Raffaele Barretta
Nanomaterials 2021, 11(4), 961; https://doi.org/10.3390/nano11040961
Received: 25 February 2021 / Revised: 5 April 2021 / Accepted: 6 April 2021 / Published: 9 April 2021
(This article belongs to the Special Issue Multiscale Innovative Materials and Structures)
In this study, a self-sensing cementitious stabilized sand (CSS) was developed by the incorporation of hybrid carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) based on the piezoresistivity principle. For this purpose, different concentrations of CNTs and GNPs (1:1) were dispersed into the CSS, and specimens were fabricated using the standard compaction method with optimum moisture. The mechanical and microstructural, durability, and piezoresistivity performances, of CSS were investigated by various tests after 28 days of hydration. The results showed that the incorporation of 0.1%, 0.17%, and 0.24% CNT/GNP into the stabilized sand with 10% cement caused an increase in UCS of about 65%, 31%, and 14%, respectively, compared to plain CSS. An excessive increase in the CNM concentration beyond 0.24% to 0.34% reduced the UCS by around 13%. The addition of 0.1% CNMs as the optimum concentration increased the maximum dry density of the CSS as well as leading to optimum moisture reduction. Reinforcing CSS with the optimum concentration of CNT/GNP improved the hydration rate and durability of the specimens against severe climatic cycles, including freeze–thaw and wetting–drying. The addition of 0.1%, 0.17%, 0.24%, and 0.34% CNMs into the CSS resulted in gauge factors of about 123, 139, 151, and 173, respectively. However, the Raman and X-ray analysis showed the negative impacts of harsh climatic cycles on the electrical properties of the CNT/GNP and sensitivity of nano intruded CSS. View Full-Text
Keywords: self-sensing; stabilized sand; CNT/GNP; mechanical; microstructural; durability; piezoresistivity self-sensing; stabilized sand; CNT/GNP; mechanical; microstructural; durability; piezoresistivity
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MDPI and ACS Style

Abedi, M.; Fangueiro, R.; Correia, A.G. Development of a Novel Multifunctional Cementitious-Based Geocomposite by the Contribution of CNT and GNP. Nanomaterials 2021, 11, 961. https://doi.org/10.3390/nano11040961

AMA Style

Abedi M, Fangueiro R, Correia AG. Development of a Novel Multifunctional Cementitious-Based Geocomposite by the Contribution of CNT and GNP. Nanomaterials. 2021; 11(4):961. https://doi.org/10.3390/nano11040961

Chicago/Turabian Style

Abedi, Mohammadmahdi, Raul Fangueiro, and António G. Correia. 2021. "Development of a Novel Multifunctional Cementitious-Based Geocomposite by the Contribution of CNT and GNP" Nanomaterials 11, no. 4: 961. https://doi.org/10.3390/nano11040961

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