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

Zhang, Zuhua and Yao, Xiao and Zhu, Huajun and Chen, Yue (2009) Role of water in the synthesis of calcined kaolin-based geopolymer. Applied Clay Science, 43 (2). pp. 218-223. ISSN 0169-1317

Abstract

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 Si4+ and Al3+ 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%.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2008 Elsevier B.V. Permanent restricted access to published version in accordance with the copyright policy of the publisher. Authors first names have been used as family names.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 31 Jul 2014 05:41
Last Modified: 29 Aug 2014 05:22
Uncontrolled Keywords: geopolymer; kaolin; nonevaporable water; thermogravimetry
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030602 Chemical Thermodynamics and Energetics
03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870399 Construction Materials Performance and Processes not elsewhere classified
Identification Number or DOI: 10.1016/j.clay.2008.09.003
URI: http://eprints.usq.edu.au/id/eprint/25669

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