Abstract
The impact of graphite nanoplatelets (GNPs) on the physical and mechanical properties of cementitious nanocomposites was investigated. A market-available premixed mortar was modified with 0.01% by weight of cement of commercial GNPs characterized by two distinctively different aspect ratios.
The rheological behavior of the GNP-modified fresh admixtures was thoroughly evaluated. Hardened cementitious nanocomposites were investigated in terms of density, microstructure (Scanning Electron Microscopy, SEM and micro–Computed Tomography, μ-CT), mechanical properties (three-point bending and compression tests), and physical properties (electrochemical impedance spectroscopy, EIS and thermal conductivity measurements). At 28 days, all GNP-modified mortars showed about 12% increased density. Mortars reinforced with high aspect ratio GNPs exhibited the highest compressive and flexural strength: about 14% and 4% improvements compared to control sample, respectively. Conversely, low aspect ratio GNPs led to cementitious nanocomposites characterized by 36% decreased electrical resistivity combined with 60% increased thermal conductivity with respect to the control sample.
Original language | English |
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Pages (from-to) | 20019-20031 |
Number of pages | 13 |
Journal | Ceramics International |
Volume | 47 |
Issue number | 14 |
Early online date | 3 Apr 2021 |
DOIs | |
Publication status | Published - 15 Jul 2021 |
Bibliographical note
Funding Information:The authors wish to thank prof. Alessandra D'Epifanio of the Department of Chemical Science and Technologies - University of Rome Tor Vergata for the availability of EIS measurement apparatus.
Publisher Copyright:
© 2021 Elsevier Ltd and Techna Group S.r.l.
Keywords
- Cementitious nanocomposites
- Graphite nanoplatelets (GNPs)
- Mechanical properties
- Microstructure
- Resistivity
- Thermal conductivity
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry