Effect of Aluminum Incorporation on the Reaction Process and Reaction Products of Hydrated Magnesium Silicate
In this study, we investigated the impact of aluminium ion (Al3+) incorporation on the microstructure and the phase transformation of the magnesium silicate hydrate system. The magnesium silicate hydrate system with aluminium was prepared by mixing magnesium oxide and silica fume with different alum...
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Frontiers Media S.A.
2022-01-01
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmats.2021.810535/full |
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| author | Yuan Jia Yuan Jia Yuxin Zou Xinmei Zou Yaoting Jiang Fangyuan Li Wangkun Ma Hongli Yan Rui Hua |
| author_facet | Yuan Jia Yuan Jia Yuxin Zou Xinmei Zou Yaoting Jiang Fangyuan Li Wangkun Ma Hongli Yan Rui Hua |
| author_sort | Yuan Jia |
| collection | DOAJ |
| description | In this study, we investigated the impact of aluminium ion (Al3+) incorporation on the microstructure and the phase transformation of the magnesium silicate hydrate system. The magnesium silicate hydrate system with aluminium was prepared by mixing magnesium oxide and silica fume with different aluminium ion contents (the Al/Si molar ratios of 0.01, 0.02, 0.05, 0.1, 0.2) at room temperature. The high degree of polymerization of the magnesium silicate hydrate phases resulted in the limited incorporation of aluminium in the structure of magnesium silicate hydrate. The silicon-oxygen tetrahedra sites of magnesium silicate hydrate layers, however, were unable to substitute for silicon sites through inverted silicon-oxygen linkages. The increase in aluminium ion content raised the degree of polymerization of the magnesium silicate hydrate phases from 0.84 to 0.92. A solid solution was formed from residual aluminum-amorphous phases such as hydroxyl-aluminum and magnesium silicate hydrate phases. X-ray diffraction (XRD), field emission scanning electron microscope (F-SEM), and 29Si and 27Al MAS NMR data showed that the addition of Al3+ promotes the hydration process of MgO and has an obvious effect on the appearance of M-S-H gel. The gel with low aluminum content is fluffy, while the gel with high aluminum content has irregular flakes. The amount of Al3+ that enters the M-S-H gel increased with the increase of Al3+ content, but there was a threshold: the highest Al/Si molar ratio of M-S-H gel can be maintained at about 0.006. |
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| id | doaj.art-062548958518404f8839af2653b7b497 |
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| issn | 2296-8016 |
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| last_indexed | 2024-04-11T17:06:32Z |
| publishDate | 2022-01-01 |
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| series | Frontiers in Materials |
| spelling | doaj.art-062548958518404f8839af2653b7b4972022-12-22T04:13:01ZengFrontiers Media S.A.Frontiers in Materials2296-80162022-01-01810.3389/fmats.2021.810535810535Effect of Aluminum Incorporation on the Reaction Process and Reaction Products of Hydrated Magnesium SilicateYuan Jia0Yuan Jia1Yuxin Zou2Xinmei Zou3Yaoting Jiang4Fangyuan Li5Wangkun Ma6Hongli Yan7Rui Hua8Hebei Provincial Laboratory of Inorganic Nonmetallic Materials and Hebei Provincial Industrial Solid Waste Comprehensive Utilization Technology Innovation Center, Tangshan, ChinaCollege of Materials Science and Engineering, North China University of Science and Technology, Tangshan, ChinaCollege of Materials Science and Engineering, North China University of Science and Technology, Tangshan, ChinaCollege of Materials Science and Engineering, North China University of Science and Technology, Tangshan, ChinaCollege of Materials Science and Engineering, North China University of Science and Technology, Tangshan, ChinaCollege of Materials Science and Engineering, North China University of Science and Technology, Tangshan, ChinaTechnical Information Research Institute of Building Materials Industry, Beijing, ChinaChina Railway 14th Bureau Group 2nd Engineering Co., Ltd., Taian, ChinaChina Railway 14th Bureau Group 2nd Engineering Co., Ltd., Taian, ChinaIn this study, we investigated the impact of aluminium ion (Al3+) incorporation on the microstructure and the phase transformation of the magnesium silicate hydrate system. The magnesium silicate hydrate system with aluminium was prepared by mixing magnesium oxide and silica fume with different aluminium ion contents (the Al/Si molar ratios of 0.01, 0.02, 0.05, 0.1, 0.2) at room temperature. The high degree of polymerization of the magnesium silicate hydrate phases resulted in the limited incorporation of aluminium in the structure of magnesium silicate hydrate. The silicon-oxygen tetrahedra sites of magnesium silicate hydrate layers, however, were unable to substitute for silicon sites through inverted silicon-oxygen linkages. The increase in aluminium ion content raised the degree of polymerization of the magnesium silicate hydrate phases from 0.84 to 0.92. A solid solution was formed from residual aluminum-amorphous phases such as hydroxyl-aluminum and magnesium silicate hydrate phases. X-ray diffraction (XRD), field emission scanning electron microscope (F-SEM), and 29Si and 27Al MAS NMR data showed that the addition of Al3+ promotes the hydration process of MgO and has an obvious effect on the appearance of M-S-H gel. The gel with low aluminum content is fluffy, while the gel with high aluminum content has irregular flakes. The amount of Al3+ that enters the M-S-H gel increased with the increase of Al3+ content, but there was a threshold: the highest Al/Si molar ratio of M-S-H gel can be maintained at about 0.006.https://www.frontiersin.org/articles/10.3389/fmats.2021.810535/fullmagnesium silicate hydrate systemhydroxyl-aluminumphase transformationmicrostructurealuminium ion content |
| spellingShingle | Yuan Jia Yuan Jia Yuxin Zou Xinmei Zou Yaoting Jiang Fangyuan Li Wangkun Ma Hongli Yan Rui Hua Effect of Aluminum Incorporation on the Reaction Process and Reaction Products of Hydrated Magnesium Silicate Frontiers in Materials magnesium silicate hydrate system hydroxyl-aluminum phase transformation microstructure aluminium ion content |
| title | Effect of Aluminum Incorporation on the Reaction Process and Reaction Products of Hydrated Magnesium Silicate |
| title_full | Effect of Aluminum Incorporation on the Reaction Process and Reaction Products of Hydrated Magnesium Silicate |
| title_fullStr | Effect of Aluminum Incorporation on the Reaction Process and Reaction Products of Hydrated Magnesium Silicate |
| title_full_unstemmed | Effect of Aluminum Incorporation on the Reaction Process and Reaction Products of Hydrated Magnesium Silicate |
| title_short | Effect of Aluminum Incorporation on the Reaction Process and Reaction Products of Hydrated Magnesium Silicate |
| title_sort | effect of aluminum incorporation on the reaction process and reaction products of hydrated magnesium silicate |
| topic | magnesium silicate hydrate system hydroxyl-aluminum phase transformation microstructure aluminium ion content |
| url | https://www.frontiersin.org/articles/10.3389/fmats.2021.810535/full |
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