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What Happens to 5 Year Old Metakaolin Geopolymers’ the Effect of Alkali Cation

  • Susan A. BernalEmail author
  • Jannie S. J. van Deventer
  • John L. Provis
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 10)

Abstract

In this study we report X-ray diffraction and dilatometry results of metakaolin (MK) geopolymers produced with Na, K, Rb or Cs silicate solutions, and cured for 7 days and 5 years, with the aim of identifying variations in structure and performance (dimensional stability at elevated temperature) over an extended curing period at ambient temperature. All of the geopolymers studied are mainly X-ray amorphous after 5 years of curing; however, in Rb-based and Cs-based geopolymers formation of aluminosilicate crystalline phases was identified. As the alkali cation radius increases, so does the thermal stability of the MK-geopolymer, potentially as a consequence of the combined effect of the higher degree of ordering of the geopolymer itself, which might retard the dehydration of the geopolymers upon heating, and the reduced energy of hydration of larger alkali cations. The 7-day and 5-year cured samples produced with Rb and Cs silicate solutions do not exhibit significant dimensional changes above 300 °C, with a maximum shrinkage of <2 % after exposure to 1100 °C. This shows that increasing the radius of the alkali cation during geopolymerisation of MK has an effect on the thermal stability of these materials, and promotes the formation of a highly densified and rigid structure at advanced curing ages.

Keywords

Fumed Silica Dimensional Change Silicate Solution Alkali Cation Geopolymer Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Notes

Acknowledgments

This study was sponsored by the Australian Research Council (ARC) through Discovery Project and Linkage Project Grants, including co-funding of the linkage project by Zeobond Pty Ltd. We thank David G. Brice and Dr Peter Duxson for sample synthesis, data collection, and discussions. The participation of J.L Provis and S.A. Bernal was supported by the University of Sheffield.

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Copyright information

© RILEM 2015

Authors and Affiliations

  • Susan A. Bernal
    • 1
    Email author
  • Jannie S. J. van Deventer
    • 2
    • 3
  • John L. Provis
    • 1
    • 2
  1. 1.Department of Materials Science and EngineeringThe University of SheffieldSheffieldUK
  2. 2.Department of Chemical and Biomolecular EngineeringThe University of MelbourneMelbourneAustralia
  3. 3.Zeobond Pty LtdDocklandsAustralia

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