The shrinkage of alkali activated fly ash
The shrinkage of alkali activated fly ash
复制标题
碱活化粉煤灰的收缩
DOI：
10.1016/j.cemconres.2014.10.024
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发表时间：
2015-02-01
影响因子：
11.4
通讯作者：
Ye, G.
中科院分区：
文献类型：
--
作者：
Ma, Y.;Ye, G.
研究了不同水玻璃掺量的碱激发粉煤灰浆体的自收缩和干燥收缩。较高的Na 2 O和SiO2含量导致较大的自生收缩和干燥收缩。虽然在最初的1-3天内获得了大的自生收缩，但在椭圆环试验中没有观察到开裂。在AAFA浆体中，水不是反应物，而主要起介质作用。实验结果表明，AAFA的自收缩不是由水泥浆体的自干燥过程引起的，而是与硅酸铝凝胶结构的不断重组和聚合有关。AAFA浆体具有较大的干燥收缩表现出较高的失重。微观结构的不同导致了AAFA混合料的不同干燥收缩率。(C)2014爱思唯尔有限公司版权所有。
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.