期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 336, 期 1-3, 页码 57-63出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2008.11.019
关键词
Geopolymer; Aluminosilicate; Fly ash; Dilatometry; Strength
资金
- Australian Research Council (ARC)
- Discovery Grants program
The correlation between mechanical and dilatometric properties of aluminosilicate geopolymer binders is highlighted by analysis of a set of samples synthesised from a single ash source using different activating solution compositions and liquid/solid ratios. The geopolymers which display the best strength performance also show a small expansion in the temperature range 700-800 degrees C, which is identified as corresponding to the swelling of a high-silica phase present as pockets within the geopolymeric gel structure. Systems in which this phase is absent (made using hydroxide activating solutions or very low liquid/solid ratios) generally show a low extent of binder formation and do not achieve high strength, while systems in which the expansive phase dominates have a sub-optimally structured geopolymer phase and also correspondingly reduced strength. (C) 2008 Elsevier B.V. All rights reserved.
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