Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites
This paper experimentally investigates the influence of carbon nanotubes (CNTs) on phase composition, microstructure deterioration, thermal behavior, and residual mechanical strengths of cementitious composites exposed to elevated temperatures. Cement mortars with small dosages of CNTs, 0.05% and 0....
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-02-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/26/4/850 |
| _version_ | 1797413774986051584 |
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| author | Mohammad R. Irshidat Nasser Al-Nuaimi Mohamed Rabie |
| author_facet | Mohammad R. Irshidat Nasser Al-Nuaimi Mohamed Rabie |
| author_sort | Mohammad R. Irshidat |
| collection | DOAJ |
| description | This paper experimentally investigates the influence of carbon nanotubes (CNTs) on phase composition, microstructure deterioration, thermal behavior, and residual mechanical strengths of cementitious composites exposed to elevated temperatures. Cement mortars with small dosages of CNTs, 0.05% and 0.2% by weight of cement, were prepared and then heated at 25 °C, 150 °C, 200 °C, 450 °C, and 600 °C for two hours before being tested. The results show positive impact of the CNTs on the hydration process of cement mortar at room temperature and at higher temperatures up to 200 °C. Decomposition of the hydration products is obvious at 450 °C, whereas sever deterioration in the microstructure occurs at 600 °C. The nano reinforcement and bridging effect of the CNTs are obvious up to 450 °C. Thermal behavior characterization shows that CNTs incorporation enhances the thermal conductivity of the unheated and heat-treated mortar specimens. The decomposition of the hydration products needs more heat in the presence of CNTs. Finally, presence of CNTs significantly enhances the residual compressive and flexural strengths of heated mortar specimens for all studied temperatures. |
| first_indexed | 2024-03-09T05:22:58Z |
| format | Article |
| id | doaj.art-3e8731c46dd243938dc2141da23a543c |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T05:22:58Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-3e8731c46dd243938dc2141da23a543c2023-12-03T12:38:47ZengMDPI AGMolecules1420-30492021-02-0126485010.3390/molecules26040850Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious CompositesMohammad R. Irshidat0Nasser Al-Nuaimi1Mohamed Rabie2Center for Advanced Materials (CAM), Qatar University, P.O. Box 2713, Doha, QatarCenter for Advanced Materials (CAM), Qatar University, P.O. Box 2713, Doha, QatarCenter for Advanced Materials (CAM), Qatar University, P.O. Box 2713, Doha, QatarThis paper experimentally investigates the influence of carbon nanotubes (CNTs) on phase composition, microstructure deterioration, thermal behavior, and residual mechanical strengths of cementitious composites exposed to elevated temperatures. Cement mortars with small dosages of CNTs, 0.05% and 0.2% by weight of cement, were prepared and then heated at 25 °C, 150 °C, 200 °C, 450 °C, and 600 °C for two hours before being tested. The results show positive impact of the CNTs on the hydration process of cement mortar at room temperature and at higher temperatures up to 200 °C. Decomposition of the hydration products is obvious at 450 °C, whereas sever deterioration in the microstructure occurs at 600 °C. The nano reinforcement and bridging effect of the CNTs are obvious up to 450 °C. Thermal behavior characterization shows that CNTs incorporation enhances the thermal conductivity of the unheated and heat-treated mortar specimens. The decomposition of the hydration products needs more heat in the presence of CNTs. Finally, presence of CNTs significantly enhances the residual compressive and flexural strengths of heated mortar specimens for all studied temperatures.https://www.mdpi.com/1420-3049/26/4/850carbon nanotubescement mortarfirethermalstrengthmicrostructure |
| spellingShingle | Mohammad R. Irshidat Nasser Al-Nuaimi Mohamed Rabie Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites Molecules carbon nanotubes cement mortar fire thermal strength microstructure |
| title | Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites |
| title_full | Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites |
| title_fullStr | Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites |
| title_full_unstemmed | Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites |
| title_short | Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites |
| title_sort | influence of carbon nanotubes on phase composition thermal and post heating behavior of cementitious composites |
| topic | carbon nanotubes cement mortar fire thermal strength microstructure |
| url | https://www.mdpi.com/1420-3049/26/4/850 |
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