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In this study, low-carbon cementitious materials (LCCM), with C4A3Ŝ and C2S as the primary mineral components, were synthesized using coal gangue, carbide slag, and desulfurization gypsum as raw materials. A systematic investigation was conducted into the effects of various mixing water and curing conditions on the mechanical properties of LCCM, including fresh water mixing with standard curing, fresh water mixing with sea water curing, sea water mixing with standard curing, and sea water mixing with sea water curing. The variation patterns of free chloride ion content in LCCM under these different mixing and curing conditions were examined. The evolution of hydration products under varying mixing and curing conditions was characterized using thermogravimetry–differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Nuclear magnetic resonance (NMR) technology was employed to analyze the pore structure, pore size distribution, and porosity characteristics of LCCM at different hydration ages. Based on grey theory, the relationships between the mass loss rate of hydration products and compressive strength, as well as the correlation between pore structure and compressive strength, were comprehensively evaluated.

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Mechanical Properties of Hardened Pastes of Seawater-Mixed Low-Carbon Cementitious Materials

  • 章节

  • 发表日期：

    2025年

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  • Changwang Yan,
  • Ru Bai,
  • Ju Zhang

摘要

In this study, low-carbon cementitious materials (LCCM), with C4A3Ŝ and C2S as the primary mineral components, were synthesized using coal gangue, carbide slag, and desulfurization gypsum as raw materials. A systematic investigation was conducted into the effects of various mixing water and curing conditions on the mechanical properties of LCCM, including fresh water mixing with standard curing, fresh water mixing with sea water curing, sea water mixing with standard curing, and sea water mixing with sea water curing. The variation patterns of free chloride ion content in LCCM under these different mixing and curing conditions were examined. The evolution of hydration products under varying mixing and curing conditions was characterized using thermogravimetry–differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Nuclear magnetic resonance (NMR) technology was employed to analyze the pore structure, pore size distribution, and porosity characteristics of LCCM at different hydration ages. Based on grey theory, the relationships between the mass loss rate of hydration products and compressive strength, as well as the correlation between pore structure and compressive strength, were comprehensively evaluated.