The shrinkage of alkali activated fly ash

被引：212
作者：
Ma, Y. [1 ]
Ye, G. [2 ,3 ]
机构：
[1] Guangzhou Univ, Guangzhou Univ Tamkang Univ Joint Res Ctr Engn St, Guangzhou 510006, Guangdong, Peoples R China
[2] Delft Univ Technol, Dept Mat & Environm, Fac Civil Engn & Geosci, Delft, Netherlands
[3] Univ Ghent, Dept Struct Engn, B-9000 Ghent, Belgium
来源：
CEMENT AND CONCRETE RESEARCH | 2015年 / 68卷
基金：
中国国家自然科学基金;
关键词：
Alkali activated; Fly ash; Shrinkage; Pore size distribution; AUTOGENOUS SHRINKAGE; PORE STRUCTURE; CEMENT; GEL; MICROSTRUCTURE; STRENGTH; MICROANALYSIS; PERMEABILITY; PERFORMANCE; TECHNOLOGY;
D O I：
10.1016/j.cemconres.2014.10.024
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In this study, the autogenous and drying shrinkage of alkali activated fly ash (AAFA) pastes prepared with different contents of sodium silicate solution are reported. A higher amount of both Na2O and SiO2 resulted in a larger autogenous and drying shrinkage. Although a large autogenous shrinkage was obtained during the first 1-3 days, cracking was not observed in the ellipse ring tests. In AAFA pastes, water was not a reactant, but mainly acted as a medium. The experiment results indicate that the autogenous shrinkage of AAFA is not caused by the well-known self-desiccation process that happened in cement paste, but related to the continuous reorganization and polymerization of the aluminosilicate gel structure. AAFA pastes with a larger drying shrinkage exhibited a higher weight loss. The different microstructures lead to the different drying shrinkage of these AAFA mixtures. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：75 / 82
页数：8
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