Role of water in the synthesis of calcined kaolin-based geopolymer

Role of water in the synthesis of calcined kaolin-based geopolymer

Water plays an important role in the whole process of geopolymer synthesis. X-ray diffraction (XRD) and thermogravimetry (TG) showed that residual water depressed the activity development of calcined kaolin before stable crystalline phases formed as confirmed by the compressive strength. Reaction he...

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Bibliographic Details
Published in:Applied clay science Vol. 43; no. 2; pp. 218 - 223
Main Authors: Zuhua, Z., Xiao, Y., Huajun, Z., Yue, C.
Format: Journal Article
Language:English
Published: Kidlington Elsevier B.V 01-02-2009
Elsevier
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geopolymer
Kaolin
Mineralogy
Nonevaporable water
Silicates
Thermogravimetry
Geopolymer
Nonevaporable water
Kaolin
Thermogravimetry
compressive strength
synthesis
strength
dissolution
X-ray diffraction
concentration
raw materials
hydrolysis
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Summary:Water plays an important role in the whole process of geopolymer synthesis. X-ray diffraction (XRD) and thermogravimetry (TG) showed that residual water depressed the activity development of calcined kaolin before stable crystalline phases formed as confirmed by the compressive strength. Reaction heat evolution measurement revealed that high liquid/solid ratio could accelerate the dissolution of raw materials and the hydrolysis of Si 4+ and Al 3+ compounds but hinder the polycondensation when OH − concentration is high enough as 12 mol/L. The effect of nonevaporable water on the strength variation of geopolymers was firstly analyzed. The results indicated that nonevaporable water was necessary to keep the strength stable and the optimum content was about 7.4%.
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2008.09.003