Carbonation of ternary cement systems

被引：32
作者：
Martinez-Ramirez, Sagrario [1 ]
Fernandez-Carrasco, Lucia [2 ]
机构：
[1] CSIC, Inst Estruct Mat, Madrid, Spain
[2] Univ Politecn Cataluna, Dept Construcc Arquitecten I LITA, Barcelona, Spain
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2012年 / 27卷 / 01期
关键词：
Ternary cements; Carbonation; Fly ash; Gypsum; Ettringite; Raman spectroscopy; Rapidcreekite; CALCIUM ALUMINATE CEMENT; RAMAN-SPECTROSCOPY; RAPIDCREEKITE; DURABILITY; ETTRINGITE; HYDRATION; CONCRETE;
D O I：
10.1016/j.conbuildmat.2011.07.043
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The main hydration reaction product in the ternary system fly ash, calcium sulphate and calcium aluminate cement (40/20/40) at 20 degrees C is a hydrated calcium sulfoaluminate compound, an AFt phase slightly different from "traditional ettringite". The carbonation of ettringite develops gypsum but in this case rapidcreekite is formed. For the first time it has been observed that carbonation of the mentioned calcium sulfoaluminate compound (AFt), an hydrated calcium sulphate carbonated phase (Ca-2(SO4)(CO3)center dot 4H(2)O) is formed with the replacement of an SO4 row in a (040) layer of the gypsum by CO3 groups. The developed carbonated phase has been studied and analyzed through XRD, FTIR, Raman spectroscopy, and scanning electron microscopy. (C) 2011 Elsevier Ltd. All rights reserved.
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收藏
页码：313 / 318
页数：6
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