A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon Nanotube
In this study, cement composites were fabricated with various contents of added nano-silica (NS) and multi-walled carbon nanotubes (MWNTs). The compressive and flexural strengths of the resultant cement composites were examined. To explore the microstructures and MWNT distribution, electrical conduc...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/1/152 |
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| author | Ali Raza Manan Bhandari Hyeong-Ki Kim Hyeong-Min Son Baofeng Huang Il-Woo Nam |
| author_facet | Ali Raza Manan Bhandari Hyeong-Ki Kim Hyeong-Min Son Baofeng Huang Il-Woo Nam |
| author_sort | Ali Raza |
| collection | DOAJ |
| description | In this study, cement composites were fabricated with various contents of added nano-silica (NS) and multi-walled carbon nanotubes (MWNTs). The compressive and flexural strengths of the resultant cement composites were examined. To explore the microstructures and MWNT distribution, electrical conductivity tests, and scanning electron microscopy were conducted. In addition, the strength results were analyzed based on thermal analysis and porosity evaluations. The electrical conductivity results indicated that MWNTs were satisfactorily distributed in the cement composites. In the mechanical strength tests, the composite with a 0.6% MWNT and 5% NS content and another with a 0.3% MWNT and 5% NS content yielded enhancements in the compressive and flexural strengths of 17.2% and 52% compared with the control samples, respectively. However, composites containing relatively large amounts of both NS and MWNTs showed degradation in the mechanical strength. The enhancement or degradation of the strength was supported by porosity evaluations and thermal analysis results. In particular, the degradation of the strength due to the incorporation of large amounts of both MWNTs and NS was explained by thermogravimetric analysis, which indicated a limited generation of calcium silicate hydrate (C-S-H) hydration products. The lower generation of C-S-H was likely due to the dense microstructure of MWNT/NS-incorporated cement hindering the reactions between calcium hydroxide and the NS. |
| first_indexed | 2024-03-10T13:46:04Z |
| format | Article |
| id | doaj.art-fbcec0633b384800973de45f055b7cb7 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T13:46:04Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-fbcec0633b384800973de45f055b7cb72023-11-21T02:37:01ZengMDPI AGApplied Sciences2076-34172020-12-0111115210.3390/app11010152A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon NanotubeAli Raza0Manan Bhandari1Hyeong-Ki Kim2Hyeong-Min Son3Baofeng Huang4Il-Woo Nam5College of Civil Engineering, Nanjing Tech University, Nanjing 211800, ChinaCollege of Civil Engineering, Nanjing Tech University, Nanjing 211800, ChinaSchool of Architecture, Chosun University, Gwangju 61452, KoreaDepartment of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, KoreaCollege of Civil Engineering, Nanjing Tech University, Nanjing 211800, ChinaSchool of Spatial Environment System Engineering, Handong Global University, Gyeongbuk 37554, KoreaIn this study, cement composites were fabricated with various contents of added nano-silica (NS) and multi-walled carbon nanotubes (MWNTs). The compressive and flexural strengths of the resultant cement composites were examined. To explore the microstructures and MWNT distribution, electrical conductivity tests, and scanning electron microscopy were conducted. In addition, the strength results were analyzed based on thermal analysis and porosity evaluations. The electrical conductivity results indicated that MWNTs were satisfactorily distributed in the cement composites. In the mechanical strength tests, the composite with a 0.6% MWNT and 5% NS content and another with a 0.3% MWNT and 5% NS content yielded enhancements in the compressive and flexural strengths of 17.2% and 52% compared with the control samples, respectively. However, composites containing relatively large amounts of both NS and MWNTs showed degradation in the mechanical strength. The enhancement or degradation of the strength was supported by porosity evaluations and thermal analysis results. In particular, the degradation of the strength due to the incorporation of large amounts of both MWNTs and NS was explained by thermogravimetric analysis, which indicated a limited generation of calcium silicate hydrate (C-S-H) hydration products. The lower generation of C-S-H was likely due to the dense microstructure of MWNT/NS-incorporated cement hindering the reactions between calcium hydroxide and the NS.https://www.mdpi.com/2076-3417/11/1/152nano-silicacarbon nanotubecement compositesmechanical strengththermal analysis |
| spellingShingle | Ali Raza Manan Bhandari Hyeong-Ki Kim Hyeong-Min Son Baofeng Huang Il-Woo Nam A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon Nanotube Applied Sciences nano-silica carbon nanotube cement composites mechanical strength thermal analysis |
| title | A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon Nanotube |
| title_full | A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon Nanotube |
| title_fullStr | A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon Nanotube |
| title_full_unstemmed | A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon Nanotube |
| title_short | A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon Nanotube |
| title_sort | study on mechanical characteristics of cement composites fabricated with nano silica and carbon nanotube |
| topic | nano-silica carbon nanotube cement composites mechanical strength thermal analysis |
| url | https://www.mdpi.com/2076-3417/11/1/152 |
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