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The complexity surrounding the cement composition due to the presence of numerous hydrates requires a multidimensional approach to bridge the existing knowledge gaps. Thermodynamic modelling provides a fast and efficient way of predicting the cement hydrates assemblages and involved reaction mechanisms with the possibility of changing factors affecting reactions such as temperature and system composition. Thermodynamic modelling is currently being used to complement experimental data and vice versa. In the current study, we explored the role of kunkur fines, sourced as quarrying waste, in ternary blended cements. Specifically, the effect of kunkur fines addition on the physico-mechanical properties and fire resistance were assessed, in comparison with OPC and LC3 cement. The ambient temperature behaviour was modelled using the GEMS software, whereas the predicted phase assemblage at high temperature (750 ℃) was obtained by the FactSage software. The results show that kunkur fines contributed to the overall cement reactivity and influenced phase assemblage, which in turn had a role in controlling the mechanical properties and behaviour at high temperature.

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Use of Kunkur Fines from Quarrying Waste in Blended Cements: Thermodynamic Modelling and Experimental Assessment

  • 会议论文

  • 发表日期：

    2025年

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  • Victor Kiptoo Mutai,
  • Cyprian Muturia M’thiruaine,
  • Joseph Mwiti Marangu,
  • Filippo Disconzi,
  • Luca Valentini

摘要

The complexity surrounding the cement composition due to the presence of numerous hydrates requires a multidimensional approach to bridge the existing knowledge gaps. Thermodynamic modelling provides a fast and efficient way of predicting the cement hydrates assemblages and involved reaction mechanisms with the possibility of changing factors affecting reactions such as temperature and system composition. Thermodynamic modelling is currently being used to complement experimental data and vice versa. In the current study, we explored the role of kunkur fines, sourced as quarrying waste, in ternary blended cements. Specifically, the effect of kunkur fines addition on the physico-mechanical properties and fire resistance were assessed, in comparison with OPC and LC3 cement. The ambient temperature behaviour was modelled using the GEMS software, whereas the predicted phase assemblage at high temperature (750 ℃) was obtained by the FactSage software. The results show that kunkur fines contributed to the overall cement reactivity and influenced phase assemblage, which in turn had a role in controlling the mechanical properties and behaviour at high temperature.