| Titre : |
Cementitious composites incorporating Multi-Walled Carbon Nanotubes (MWCNTs): effects of annealing and other dispersion methods on the electrical and mechanical properties |
| Type de document : |
texte imprimé |
| Auteurs : |
Shaban Shahzad, Auteur ; Ahmed Toumi, Auteur ; Jean-Paul Balayssac, Auteur ; Anaclet Turatsinze, Auteur ; Vanessa Mazars, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
14 p. |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Composites -- Propriétés électriques
Composites -- Propriétés mécaniques
Dispersions et suspensions
Matériaux cimentaires -- Additifs
Nanotubes de carbone à parois multiplesUn nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets :
- le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ;
- le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier.
|
| Index. décimale : |
620.13 Matériaux de construction : pierre, ciment, béton, liants de |
| Résumé : |
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. |
| Note de contenu : |
- MATERIALS AND METHODS : Materials - Methods adopted for dispersion - Preparation of specimens
- TESTING PROCEDURES : Assessment of dispersion of CNT in solution - Resistivity assessment on mortars - Mechanical properties - Self-sensing test
- RESULTS AND DISCUSSION : Electrical properties - Mechanical properties - Self-sensing test
- Table 1 : Physical properties and chemical composition of Portland cement (CEM I 52.5R)
- Table 2 : Physical properties and chemical composition of normalized sand
- Table 3 : Properties of MWCNTs
- Table 4 : Nomenclature of the mortar specimens
- Table 5 : Voltage and resistance at the balanced condition of WSB circuit |
| Référence de l'article : |
104 |
| DOI : |
https://doi.org/10.1051/mattech/2022020 |
| En ligne : |
https://www.mattech-journal.org/articles/mattech/pdf/2022/01/mt210072.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37815 |
in MATERIAUX & TECHNIQUES > Vol. 110, N° 1 (13/06/2022) . - 14 p.
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