Thermal decomposition of ettringite Ca-6[Al(OH)(6)](2)(SO4)(3).26H(2)O

被引:97
作者
Hall, C [1 ]
Barnes, P [1 ]
Billimore, AD [1 ]
Jupe, AC [1 ]
Turrillas, X [1 ]
机构
[1] UNIV LONDON BIRKBECK COLL, DEPT CRYSTALLOG, IND MAT UNIT, LONDON WC1E 7HX, ENGLAND
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1996年 / 92卷 / 12期
关键词
D O I
10.1039/ft9969202125
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The thermal decomposition of ettringite in the presence of water and impurity gypsum has been observed by energy-dispersive synchrotron X-ray diffraction and FTIR spectroscopy. The decomposition occurs rapidly at 114 degrees C to produce a monosulfate, with 0.96 nm interlayer spacing, and bassanite. The thermal expansion of ettringite from 70 to 110 degrees C is 42 x 10(-6) K-1 in the a direction and 22 x 10(-6) K-1 in the c direction. The gypsum acts as a transient intermediate in the decomposition. The mechanism of this rapid decomposition is discussed.
引用
收藏
页码:2125 / 2129
页数:5
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