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<p>This study focuses on the early-age heat of hydration characteristics of calcium sulfoaluminate (CSA) cement paste, with emphasis on the influence of incorporating supplementary cementitious materials (SCMs) such as fly ash (FA) at 20% and limestone powder (LP) at 15%, and a combined 20% FA and 15% LP (35%). With a water-to-binder ratio (w/b) of 0.40, an isothermal calorimeter was used to evaluate the heat flow and the rate of heat release. Other experiments examined included chemical shrinkage, Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), and X-ray diffraction (XRD). The findings reveal that CSA cement paste exhibits early-age strength and faster heat-releasing rates during hydration compared to ordinary Portland cement (OPC) paste. Two types of exothermic peaks during hydration—dissolution exothermic and reaction exothermic peaks were observed on all systems studied. CSA cement paste showed a significant surge in chemical shrinkage during their initial stages due to their rapid and efficient hydration process.</p>

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Heat of hydration and chemical shrinkage of early-age hardening cement paste produced with calcium sulfoaluminate cement incorporating fly ash and limestone powder

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月11日

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  • Tijani Mohammed,
  • Anthony Torres,
  • Federico Aguayo,
  • Paola Huynh,
  • Ikechukwu K. Okechi,
  • Asmita Mankar

摘要

This study focuses on the early-age heat of hydration characteristics of calcium sulfoaluminate (CSA) cement paste, with emphasis on the influence of incorporating supplementary cementitious materials (SCMs) such as fly ash (FA) at 20% and limestone powder (LP) at 15%, and a combined 20% FA and 15% LP (35%). With a water-to-binder ratio (w/b) of 0.40, an isothermal calorimeter was used to evaluate the heat flow and the rate of heat release. Other experiments examined included chemical shrinkage, Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), and X-ray diffraction (XRD). The findings reveal that CSA cement paste exhibits early-age strength and faster heat-releasing rates during hydration compared to ordinary Portland cement (OPC) paste. Two types of exothermic peaks during hydration—dissolution exothermic and reaction exothermic peaks were observed on all systems studied. CSA cement paste showed a significant surge in chemical shrinkage during their initial stages due to their rapid and efficient hydration process.