Numéro |
Matériaux & Techniques
Volume 110, Numéro 1, 2022
|
|
---|---|---|
Numéro d'article | 104 | |
Nombre de pages | 14 | |
Section | Matériaux adaptatifs et structures / Smart materials and structure | |
DOI | https://doi.org/10.1051/mattech/2022020 | |
Publié en ligne | 20 avril 2022 |
Regular Article
Cementitious composites incorporating Multi-Walled Carbon Nanotubes (MWCNTs): effects of annealing and other dispersion methods on the electrical and mechanical properties
LMDC, Université de Toulouse, INSA,
UPS Génie Civil, 135 Avenue de Rangueil,
31077
Toulouse Cedex 04, France
* e-mail: shahzad@insa-toulouse.fr
Received:
16
November
2021
Accepted:
23
February
2022
This study focuses on different techniques for dispersing Multi-Walled Carbon Nanotubes (MWCNTs) in cementitious materials. The impact of dispersion is observed through electrical resistivity and mechanical properties of cementitious composites. Two contents (0.5 and 1% by mass of cement) of MWCNTs are investigated and three different techniques were used to disperse CNTs in water by sonication: (i) pristine, P-CNT, (ii) functionalized carbon nanotubes by classical approach (dispersive agent, D-CNT), and (iii) by an innovative approach (annealing, A-CNT). Self-sensing response of the material under cyclic compressive loading is measured with Wheatstone Bridge (WSB) circuit. Results showed a detrimental effect of dispersive agent on the resistivity and mechanical properties of cementitious composites irrespective of the content of CNTs. However, the impact of P-CNT and A-CNT on the reduction of mechanical properties is slight. With the use of 1% content of A-CNTs, a stable resistivity response of the material is observed irrespective of the saturation degree. This indicates that content higher than 1% of A-CNTs is not required for the development of smart cementitious composites for structural health monitoring (SHM). The test results of self sensing measurements indicate a poor repeatability of the electrical response for plain mortar under each loading cycle while, stable response is noticed with specimens incorporating 1% of A-CNTs. The maximum variation in fractional change in voltage (FCV) shown by plain mortar is 6.3% indicating high electrical resistance of plain mortar, while in case of mortar containing 1% A-CNTs, variation in FCV is 35% indicating lower electrical resistance and better sensitivity of the material.
Key words: cementitious composites / carbon nanotubes dispersion / annealing / electrical resistivity / self-sensing / wheatstone bridge
© S. Shahzad et al., 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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