A cementitious compound with composition 3CaO.Al2O3.CaCO3.11H2O

被引:139
作者
Francois, M [1 ]
Renaudin, G [1 ]
Evrard, O [1 ]
机构
[1] Univ Nancy 1, Fac Sci, Lab Chim Minerale, CNRS,URA 158, F-54506 Vandoeuvre Nancy, France
关键词
D O I
10.1107/S0108270198004223
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The tetracalcium dialuminium hydroxide carbonate pentahydrate CA(4)Al(2)(OH)(12)CO3.5H(2)O is a layered compound constituted by positively charged [Ca4Al2(OH)(12)](2+) main layers and negatively charged [CO3. 5H(2)O](2-) interlayers. The Al3+ and Ca2+ ions are six- and sevenfold coordinated by O atoms, respectively. A water molecule occupies the seventh coordination site of each of three Ca2+ ions among the four contained in the main layer. Thus, among the five water molecules contained in the interlayer, two of them can be considered as only slightly bonded. One O atom of the carbonate group occupies the seventh coordination site of the remaining Ca2+ ion. Moreover, every O atom of the carbonate groups contributes to the formation of relatively strong hydrogen bonds with water molecules, providing cohesion of the interlayer. The planar CO32- groups are tilted by 21.8 (9)degrees from the planes formed by the layers.
引用
收藏
页码:1214 / 1217
页数:4
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