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Physical evolution of Na-geopolymer derived from metakaolin up to 1000 °C

  • Advances in Geopolymer Science & Technology
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Abstract

The thermal shrinkage and weight loss of a systematic series of geopolymers with nominal composition of NaAlO2(SiO2) z  · 5.5H2O (1.15 ≤ z ≤ 2.15) made by activation of metakaolin with sodium silicate solutions are presented. The thermal behaviour of Na-geopolymers are varied, but may be categorised into four regions of behaviour exhibited by all specimens. This investigation explores the effect of nominal Si/Al on the processes and mechanisms of thermal shrinkage and weight loss throughout constant heating of Na-geopolymer. The overall thermal shrinkage of Na-geopolymer increases with increasing nominal Si/Al, with the onset temperature of structural densification occurring at lower temperature with increasing Si/Al. Thermal shrinkage is observed to result from capillary strain, dehydroxylation and viscous sintering in different temperature regions, and is explored by use of dilatometry, thermogravimetry, nitrogen porosimetry and use of different constant heating rates.

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Acknowledgements

The authors gratefully acknowledge the financial support of the Particulate Fluids Processing Centre (PFPC), a Special Research Centre of the Australian Research Council (ARC).

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Authors and Affiliations

  1. Department of Chemical and Biomolecular Engineering, The University of Melbourne, Melbourne, Victoria, 3010, Australia

    Peter Duxson, Grant C. Lukey & Jannie S. J. van Deventer

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  1. Peter Duxson
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  2. Grant C. Lukey
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  3. Jannie S. J. van Deventer
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Correspondence to Jannie S. J. van Deventer.

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Duxson, P., Lukey, G.C. & van Deventer, J.S.J. Physical evolution of Na-geopolymer derived from metakaolin up to 1000 °C. J Mater Sci 42, 3044–3054 (2007). https://doi.org/10.1007/s10853-006-0535-4

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  • DOI: https://doi.org/10.1007/s10853-006-0535-4

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