Effect of Single and Synergistic Reinforcement of PVA Fiber and Nano-SiO<sub>2</sub> on Workability and Compressive Strength of Geopolymer Composites
Geopolymer composites can be used as a proper substitute for ordinary Portland cement, which can reduce carbon dioxide (CO<sub>2</sub>) emissions and make rational use of industrial waste. In this study, an investigation of the workability and compressive strength of geopolymer composite...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/18/3765 |
| _version_ | 1797483368628092928 |
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| author | Peng Zhang Shiyao Wei Yuanxun Zheng Fei Wang Shaowei Hu |
| author_facet | Peng Zhang Shiyao Wei Yuanxun Zheng Fei Wang Shaowei Hu |
| author_sort | Peng Zhang |
| collection | DOAJ |
| description | Geopolymer composites can be used as a proper substitute for ordinary Portland cement, which can reduce carbon dioxide (CO<sub>2</sub>) emissions and make rational use of industrial waste. In this study, an investigation of the workability and compressive strength of geopolymer composites was carried out through a series of experiments, such as slump flow test, consistency meter test and compressive strength test, to clarify the interaction mechanism among superplasticizer (SP), polyvinyl alcohol (PVA) fiber, Nano-SiO<sub>2</sub> (NS) and geopolymer composites, thereby improving the properties of engineered composites. The results showed that with the increase in PVA fiber content, the flowability of geopolymer composites decreased, while the thixotropy increased. With the increase in the NS content, the flowability of geopolymer composites first increased and then decreased, reaching its best at 1.0%, while the thixotropy was the opposite. With the increase in the SP content, the flowability of geopolymer composites increased, while the thixotropy decreased. A significant correlation between thixotropy and flowability of geopolymer composites was found (R<sup>2</sup> > 0.85). In addition, the incorporation of single PVA fiber or NS significantly improved the compressive strength of geopolymer composites. Specifically, the compressive strength of geopolymer composites with 0.8% content PVA fiber (60.3 MPa) was 33.4% higher than that without PVA fiber (45.2 MPa), and the compressive strength of geopolymer composites with 1.5% content NS (52.6 MPa) was 16.4% higher than that without NS (45.2 MPa). Considering the synergistic effect, it is found that the compressive strength of geopolymer composites (58.5–63.3 MPa) was significantly higher than that without PVA fiber (45.2–52.6 MPa). However, the flowability and compressive strength of geopolymer composites were only slightly improved compared to that without NS. With the increase in the SP content, the compressive strength of geopolymer composites showed a trend of a slight decrease on the whole. Consequently, the results of this study may be useful for further research in the field of repair and prevention of the delamination of composite structures. |
| first_indexed | 2024-03-09T22:45:57Z |
| format | Article |
| id | doaj.art-e9ed73de8bb84ef48e1fc81e8491c50e |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T22:45:57Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-e9ed73de8bb84ef48e1fc81e8491c50e2023-11-23T18:29:28ZengMDPI AGPolymers2073-43602022-09-011418376510.3390/polym14183765Effect of Single and Synergistic Reinforcement of PVA Fiber and Nano-SiO<sub>2</sub> on Workability and Compressive Strength of Geopolymer CompositesPeng Zhang0Shiyao Wei1Yuanxun Zheng2Fei Wang3Shaowei Hu4Yellow River Laboratory, Zhengzhou University, Zhengzhou 450001, ChinaSchool of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaYellow River Laboratory, Zhengzhou University, Zhengzhou 450001, ChinaYellow River Laboratory, Zhengzhou University, Zhengzhou 450001, ChinaYellow River Laboratory, Zhengzhou University, Zhengzhou 450001, ChinaGeopolymer composites can be used as a proper substitute for ordinary Portland cement, which can reduce carbon dioxide (CO<sub>2</sub>) emissions and make rational use of industrial waste. In this study, an investigation of the workability and compressive strength of geopolymer composites was carried out through a series of experiments, such as slump flow test, consistency meter test and compressive strength test, to clarify the interaction mechanism among superplasticizer (SP), polyvinyl alcohol (PVA) fiber, Nano-SiO<sub>2</sub> (NS) and geopolymer composites, thereby improving the properties of engineered composites. The results showed that with the increase in PVA fiber content, the flowability of geopolymer composites decreased, while the thixotropy increased. With the increase in the NS content, the flowability of geopolymer composites first increased and then decreased, reaching its best at 1.0%, while the thixotropy was the opposite. With the increase in the SP content, the flowability of geopolymer composites increased, while the thixotropy decreased. A significant correlation between thixotropy and flowability of geopolymer composites was found (R<sup>2</sup> > 0.85). In addition, the incorporation of single PVA fiber or NS significantly improved the compressive strength of geopolymer composites. Specifically, the compressive strength of geopolymer composites with 0.8% content PVA fiber (60.3 MPa) was 33.4% higher than that without PVA fiber (45.2 MPa), and the compressive strength of geopolymer composites with 1.5% content NS (52.6 MPa) was 16.4% higher than that without NS (45.2 MPa). Considering the synergistic effect, it is found that the compressive strength of geopolymer composites (58.5–63.3 MPa) was significantly higher than that without PVA fiber (45.2–52.6 MPa). However, the flowability and compressive strength of geopolymer composites were only slightly improved compared to that without NS. With the increase in the SP content, the compressive strength of geopolymer composites showed a trend of a slight decrease on the whole. Consequently, the results of this study may be useful for further research in the field of repair and prevention of the delamination of composite structures.https://www.mdpi.com/2073-4360/14/18/3765workabilitycompressive strengthgeopolymer compositesPVA fiberNano-SiO<sub>2</sub>superplasticizer |
| spellingShingle | Peng Zhang Shiyao Wei Yuanxun Zheng Fei Wang Shaowei Hu Effect of Single and Synergistic Reinforcement of PVA Fiber and Nano-SiO<sub>2</sub> on Workability and Compressive Strength of Geopolymer Composites Polymers workability compressive strength geopolymer composites PVA fiber Nano-SiO<sub>2</sub> superplasticizer |
| title | Effect of Single and Synergistic Reinforcement of PVA Fiber and Nano-SiO<sub>2</sub> on Workability and Compressive Strength of Geopolymer Composites |
| title_full | Effect of Single and Synergistic Reinforcement of PVA Fiber and Nano-SiO<sub>2</sub> on Workability and Compressive Strength of Geopolymer Composites |
| title_fullStr | Effect of Single and Synergistic Reinforcement of PVA Fiber and Nano-SiO<sub>2</sub> on Workability and Compressive Strength of Geopolymer Composites |
| title_full_unstemmed | Effect of Single and Synergistic Reinforcement of PVA Fiber and Nano-SiO<sub>2</sub> on Workability and Compressive Strength of Geopolymer Composites |
| title_short | Effect of Single and Synergistic Reinforcement of PVA Fiber and Nano-SiO<sub>2</sub> on Workability and Compressive Strength of Geopolymer Composites |
| title_sort | effect of single and synergistic reinforcement of pva fiber and nano sio sub 2 sub on workability and compressive strength of geopolymer composites |
| topic | workability compressive strength geopolymer composites PVA fiber Nano-SiO<sub>2</sub> superplasticizer |
| url | https://www.mdpi.com/2073-4360/14/18/3765 |
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