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Incorporation of Al and Na in Hydrothermally Synthesized Tobermorite
Wang, Zehua; Ma, Shuhua; Zheng, Shili; Wang, Xiaohui
2017
发表期刊JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN0002-7820
卷号100期号:00页码:792
摘要

Calcium silicate hydrate and its Al-substituted form synthesized by a hydrothermal process were investigated by X-ray diffraction, compositional analysis, and magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, in order to determine the mechanism of Al and Na incorporation in the tobermorite structure with varying molar ratios of Ca/Si and Al/Si. At a high molar ratio of Ca/Si, the silicate chains of tobermorite are ruptured, the degree of polymerization of the silicate chains is lowered, and the high calcium concentration lowers the content of Na2O in the structure. Solid-state Si-29 and Al-27 MAS NMR spectroscopy confirm that all Al atoms were incorporated in the silicate chains of tobermorite. The tetrahedrally coordinated Al (Al(IV)) could either act as the bridging tetrahedron (Q(B)(2)) for the dreierketten chain of tobermorite, or be present in Q(3) sites that link two dreierketten chains together. Therefore, the degree of polymerization of the silicate chains of tobermorite is increased at high molar ratio of Al/Si. Furthermore, the greater charge deficit due to the replacement of Si4+ by Al3+ ions is compensated by increased adsorption or binding of Na+.

关键词Aluminosilicates C-s-h Calcium Silicate Hydrate Calcium-silicate-hydrate Sodium/sodium Compounds Nuclear-magnetic-resonance Alumina Fly-ash Aluminosilicate-hydrate Mas Nmr Substituted Tobermorites Cement Pastes Al-27 Si-29
文章类型Article
DOI10.1111/jace.14599
语种英语
WOS记录号WOS:000394545900040
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23531
专题研究所(批量导入)
通讯作者Zheng, Shili
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GB/T 7714
Wang, Zehua,Ma, Shuhua,Zheng, Shili,et al. Incorporation of Al and Na in Hydrothermally Synthesized Tobermorite[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2017,100(00):792.
APA Wang, Zehua,Ma, Shuhua,Zheng, Shili,&Wang, Xiaohui.(2017).Incorporation of Al and Na in Hydrothermally Synthesized Tobermorite.JOURNAL OF THE AMERICAN CERAMIC SOCIETY,100(00),792.
MLA Wang, Zehua,et al."Incorporation of Al and Na in Hydrothermally Synthesized Tobermorite".JOURNAL OF THE AMERICAN CERAMIC SOCIETY 100.00(2017):792.
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