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Journal of Thermal Analysis and Calorimetry

, Volume 133, Issue 1, pp 177–188 | Cite as

Thermal analysis of ternary gypsum-based binders stored in different environments

  • Lenka Scheinherrová
  • Magdaléna Doleželová
  • Jakub Havlín
  • Anton Trník
Article

Abstract

Although gypsum belongs to the low-energy environmentally friendly binders, its wider applications in building constructions are limited due to the negative effect of moisture on its mechanical properties. When calcined gypsum (CaSO4·1/2H2O) transforms into its hydrated form (CaSO4·2H2O), it is partially soluble in water and it has a relatively low strength. This problem can be resolved when gypsum is used as a part of binary or ternary binders. In this paper, a system consisting of calcined gypsum, lime, and silica fume is presented as a functional solution for a wider utilization of gypsum in wet environments. For this purpose, the newly designed materials were stored in different environments (laboratory conditions in air or water) up to 182 days. The effect of silica fume on the hydration process and the growth of the main products is evaluated by using differential scanning calorimetry and thermogravimetry in the temperature range from 25 to 1000 °C with a heating rate of 5 °C min−1 in an argon atmosphere. The carbonation level of studied materials is also evaluated. Besides this, the information about the thermal stability of studied materials is provided. These results are supported by evolved gas analysis, X-ray diffraction, and scanning electron microscopy. The basic physical and mechanical properties are determined to provide more detailed information about the behavior of the designed materials under various conditions at selected days of hydration. The addition of silica fume to the gypsum–lime system activates the pozzolanic reaction of the analyzed pastes, which is proved by the presence of the CSH phase and by the consumption of portlandite in the mixtures. Wet environment speeds up the hydration processes and prevents samples from carbonation.

Keywords

Gypsum Ternary binders Silica fume Thermal properties Calorimetry 

Notes

Acknowledgements

This research was supported by the Czech Science Foundation, Project No. GA16-01438S and by Project No. SGS16/199/OHK1/3T/11.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Department of Materials Engineering and Chemistry, Faculty of Civil EngineeringCzech Technical University in PraguePragueCzech Republic
  2. 2.Laboratory of Thermal Analysis, Central LaboratoriesInstitute of Chemical TechnologyPrague 6Czech Republic
  3. 3.Department of Physics, Faculty of Natural SciencesConstantine the Philosopher University in NitraNitraSlovakia

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