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Incorporation of Al and Na in Hydrothermally Synthesized Tobermorite
Wang, Zehua; Ma, Shuhua; Zheng, Shili; Wang, Xiaohui
2017
Source PublicationJOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN0002-7820
Volume100Issue:00Pages:792
Abstract

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+.

KeywordAluminosilicates 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
SubtypeArticle
DOI10.1111/jace.14599
Language英语
WOS IDWOS:000394545900040
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23531
Collection研究所(批量导入)
Corresponding AuthorZheng, Shili
Recommended Citation
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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