Effect of Sintering Temperature and Calcium amount on Compressive Strength of Brushite-Metakaolin Polymer Materials

  • Dunja Đukić University of Belgrade, Faculty of Biology
  • Marija Šuljagić University of Belgrade-Institute of Chemistry, Technology and Metallurgy, Department of Chemistry
  • Ljubica Andjelković University of Belgrade-Institute of Chemistry, Technology and Metallurgy, Department of Chemistry
  • Vera Pavlović University of Belgrade, Faculty of Mechanical Engineering
  • Dušan Bučevac Department of Materials Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade
  • Boško Vrbica University of Belgrade, Faculty of Chemistry
  • Miljana Mirković Department of Materials Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade

Abstract

The effect of Ca2+ amount and sintering temperature on mechanical properties of geopolymer-brushite (GPB) binders was investigated. Brushite and raw abandoned kaolinite clay thermally transformed into metakaolin were used for GPB synthesis. The complete phase and structural analyses were performed by X-ray powder diffraction, and Fourier transforms infrared spectroscopy (FT-IR). The pore-filling effect as a consequence of Ca2+ ions incorporation into the hybrid geopolymer networks improved the compressive strength. On the other hand, the chosen biscuit sintering at 800 and 900oC caused the phase transformation of brushite into calcium pyrophosphate, which negatively affected the compressive strength of such materials. The obtained results indicate that the usage of relatively high sintering temperatures is not always the necessary step for producing geopolymer-based types of cement with prominent mechanical properties.

Published
2022-08-28
Issue
Vol 54 No 3 (2022)
Section
Articles

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