Characterisation of class F fly ash geopolymer pastes immersed in acid and alkaline solutions

被引：136

作者：

Temuujin, J. ^{[1
,2
]}

Minjigmaa, A. ^{[1
]}

Lee, M. ^{[2
]}

Chen-Tan, N. ^{[2
]}

van Riessen, A. ^{[2
]}

机构：

[1] Mongolian Acad Sci, Inst Chem & Chem Technol, Ulaanbaatar, Mongolia

[2] Curtin Univ Technol, Dept Imaging & Appl Phys, Ctr Mat Res, Perth, WA 6845, Australia

来源：

CEMENT & CONCRETE COMPOSITES | 2011年 / 33卷 / 10期

关键词：

Geopolymers; Fly ash; Phase transformation; Calcination; Chemical attack;

D O I：

10.1016/j.cemconcomp.2011.08.008

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Acid and alkaline resistance of class F fly ash based geopolymer pastes has been investigated. As prepared geopolymers showed high solubility in both strong alkali and acid solutions. Calcination of the fly ash based geopolymers at 600 degrees C resulted in a decrease of amorphous component from 63.4 to 61.6 wt.%. However, the solubility of the Al, Si and Fe ions in 14 M NaOH and 18% HCl after 5 days immersion decreased from 1.3 to 16-fold in comparison to as prepared geopolymer samples. Calcination of the geopolymers also resulted in a 30% reduction in compressive strength. Acid and alkali resistance of the geopolymers investigated strongly depends on mineralogical composition change of the calcined geopolymer. Partial crystallisation of non-reacted fly ash particles in the geopolymer decreases its solubility in acid and alkali solutions. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1086 / 1091

页数：6

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