Effects of Multi-Walled Carbon Nanotube Dosages and Sonication Time on Hydration Heat Evolution in Cementitious Composites
This study aimed to investigate the heat generated during the hydration process in cementitious composites containing multi-walled carbon nanotubes (MWCNTs). The cumulative heat release and heat flow of these cementitious composites were measured over a period of 168 h using isothermal calorimetry....
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MDPI AG
2023-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/22/7246 |
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| author | Barbara Klemczak Eryk Goldmann Małgorzata Gołaszewska Marcin Górski |
| author_facet | Barbara Klemczak Eryk Goldmann Małgorzata Gołaszewska Marcin Górski |
| author_sort | Barbara Klemczak |
| collection | DOAJ |
| description | This study aimed to investigate the heat generated during the hydration process in cementitious composites containing multi-walled carbon nanotubes (MWCNTs). The cumulative heat release and heat flow of these cementitious composites were measured over a period of 168 h using isothermal calorimetry. Three different MWCNT dosages, 0.05 wt%, 0.1 wt%, and 0.2 wt%, along with two different sonication times for the solution, which were 20 min and 60 min, were applied in the experimental program. The results reveal that the incorporation of MWCNTs and the use of a naphthalene-based superplasticizer to disperse the nanotubes generally led to a reduction in heat emission during the early stages of hydration, a lower first peak value in the initial stage of hydration, and a significant delay in the acceleration period compared with the reference sample lacking this superplasticizer. Furthermore, the results demonstrate that both the dosage of multi-walled carbon nanotubes (MWCNTs) and the sonication time have an impact on the heat emission and hydration process since the same amount of superplasticizer was applied to all pastes. An increase in the MWCNT dosage led to a decrease in the rate of hydration heat at the main peak for all pastes. Additionally, longer sonication times resulted in lower values of heat generated, reduced main peak values in the heat rate evolution, and generally extended delays in the occurrence of the main peak. |
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| format | Article |
| id | doaj.art-aee461ec22c841cdad4b061c82ebcfca |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T16:39:23Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-aee461ec22c841cdad4b061c82ebcfca2023-11-24T14:53:59ZengMDPI AGMaterials1996-19442023-11-011622724610.3390/ma16227246Effects of Multi-Walled Carbon Nanotube Dosages and Sonication Time on Hydration Heat Evolution in Cementitious CompositesBarbara Klemczak0Eryk Goldmann1Małgorzata Gołaszewska2Marcin Górski3Department of Structural Engineering, Faculty of Civil Engineering, Silesian University of Technology, 44-100 Gliwice, PolandDepartment of Structural Engineering, Faculty of Civil Engineering, Silesian University of Technology, 44-100 Gliwice, PolandDepartment of Building Processes and Building Physics, Faculty of Civil Engineering, Silesian University of Technology, 44-100 Gliwice, PolandDepartment of Structural Engineering, Faculty of Civil Engineering, Silesian University of Technology, 44-100 Gliwice, PolandThis study aimed to investigate the heat generated during the hydration process in cementitious composites containing multi-walled carbon nanotubes (MWCNTs). The cumulative heat release and heat flow of these cementitious composites were measured over a period of 168 h using isothermal calorimetry. Three different MWCNT dosages, 0.05 wt%, 0.1 wt%, and 0.2 wt%, along with two different sonication times for the solution, which were 20 min and 60 min, were applied in the experimental program. The results reveal that the incorporation of MWCNTs and the use of a naphthalene-based superplasticizer to disperse the nanotubes generally led to a reduction in heat emission during the early stages of hydration, a lower first peak value in the initial stage of hydration, and a significant delay in the acceleration period compared with the reference sample lacking this superplasticizer. Furthermore, the results demonstrate that both the dosage of multi-walled carbon nanotubes (MWCNTs) and the sonication time have an impact on the heat emission and hydration process since the same amount of superplasticizer was applied to all pastes. An increase in the MWCNT dosage led to a decrease in the rate of hydration heat at the main peak for all pastes. Additionally, longer sonication times resulted in lower values of heat generated, reduced main peak values in the heat rate evolution, and generally extended delays in the occurrence of the main peak.https://www.mdpi.com/1996-1944/16/22/7246cementitious compositemulti-walled carbon nanotubessonicationhydration heatisothermal calorimetry |
| spellingShingle | Barbara Klemczak Eryk Goldmann Małgorzata Gołaszewska Marcin Górski Effects of Multi-Walled Carbon Nanotube Dosages and Sonication Time on Hydration Heat Evolution in Cementitious Composites Materials cementitious composite multi-walled carbon nanotubes sonication hydration heat isothermal calorimetry |
| title | Effects of Multi-Walled Carbon Nanotube Dosages and Sonication Time on Hydration Heat Evolution in Cementitious Composites |
| title_full | Effects of Multi-Walled Carbon Nanotube Dosages and Sonication Time on Hydration Heat Evolution in Cementitious Composites |
| title_fullStr | Effects of Multi-Walled Carbon Nanotube Dosages and Sonication Time on Hydration Heat Evolution in Cementitious Composites |
| title_full_unstemmed | Effects of Multi-Walled Carbon Nanotube Dosages and Sonication Time on Hydration Heat Evolution in Cementitious Composites |
| title_short | Effects of Multi-Walled Carbon Nanotube Dosages and Sonication Time on Hydration Heat Evolution in Cementitious Composites |
| title_sort | effects of multi walled carbon nanotube dosages and sonication time on hydration heat evolution in cementitious composites |
| topic | cementitious composite multi-walled carbon nanotubes sonication hydration heat isothermal calorimetry |
| url | https://www.mdpi.com/1996-1944/16/22/7246 |
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