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This study developed low-carbon cementitious materials (LCCM) through calcination of industrial solid wastes (coal gangue, calcium carbide slag, and desulfurization gypsum), with particular focus on hydration process regulation via desulfurization gypsum incorporation. A comprehensive investigation was conducted: 1. The effects of desulfurization gypsum on LCCM setting time, strength development, phase evolution of hydration products, chemically bound water content, molecular structure of hydration products, and microstructure of hydration products were studied. 2. The influence of desulfurization gypsum on the porosity and pore size distribution of LCCM was studied. 3. The influences of desulfurization gypsum on Nyquist diagram, conductive path, and impedance parameters of LCCM were studied based on AC impedance method. 4. The relationship between impedance parameters and mechanical properties of LCCM is established by using grey theory. 5. The effect of desulfurization gypsum on the hydration heat release of LCCM was studied, and the hydration kinetics model was established to analyze the hydration reaction degree of LCCM.

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Desulfurization Gypsum Regulates Hydration Process of Low-Carbon Cementitious Material

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  • 发表日期：

    2025年

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  • Changwang Yan,
  • Ru Bai,
  • Ju Zhang

摘要

This study developed low-carbon cementitious materials (LCCM) through calcination of industrial solid wastes (coal gangue, calcium carbide slag, and desulfurization gypsum), with particular focus on hydration process regulation via desulfurization gypsum incorporation. A comprehensive investigation was conducted: 1. The effects of desulfurization gypsum on LCCM setting time, strength development, phase evolution of hydration products, chemically bound water content, molecular structure of hydration products, and microstructure of hydration products were studied. 2. The influence of desulfurization gypsum on the porosity and pore size distribution of LCCM was studied. 3. The influences of desulfurization gypsum on Nyquist diagram, conductive path, and impedance parameters of LCCM were studied based on AC impedance method. 4. The relationship between impedance parameters and mechanical properties of LCCM is established by using grey theory. 5. The effect of desulfurization gypsum on the hydration heat release of LCCM was studied, and the hydration kinetics model was established to analyze the hydration reaction degree of LCCM.