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<p>Although all-solid-waste cementitious materials (ASWC) can effectively reduce carbon emissions in the cement industry, their practical application has been severely limited by issues such as prolonged setting times and low early-age strength. This study innovatively employs trace amounts of carbide slag (CS) to enhance the early-age performance of steel slag–granulated blast furnace slag–desulfurization gypsum (SBDC) systems. The results demonstrate that with a 5% steel slag (SS) content, the addition of 0.6% CS significantly improves system performance: the final setting times of three mix formulations were shortened from 17.2–19.1&#xa0;h to less than 5.5&#xa0;h, while the 3-day compressive strength increased by more than 16-fold. Mechanistic analysis revealed that isothermal calorimetry detected a distinct exothermic peak at 8.3&#xa0;h, with the heat flow peak intensity increasing by 5.6 times and the cumulative heat release rising by 1.2 times. Additionally, CS elevated the system pH from 11.4 to 12.5, promoting the dissolution of desulfurization gypsum and accelerating the formation of ettringite and calcium alumino-silicate hydrate C-(A)-S-H gels. As the SS content increased, the enhancing effect of CS gradually diminished. This study provides an effective approach to addressing the early-age performance deficiencies of SBDC systems with low SS content.</p>

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Effect of Carbide Slag on the Early Properties of Steel Slag–Blast Furnace Slag–Desulfurization Gypsum Cementitious Materials

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Guoju Ke,
  • Hao Zhang

摘要

Although all-solid-waste cementitious materials (ASWC) can effectively reduce carbon emissions in the cement industry, their practical application has been severely limited by issues such as prolonged setting times and low early-age strength. This study innovatively employs trace amounts of carbide slag (CS) to enhance the early-age performance of steel slag–granulated blast furnace slag–desulfurization gypsum (SBDC) systems. The results demonstrate that with a 5% steel slag (SS) content, the addition of 0.6% CS significantly improves system performance: the final setting times of three mix formulations were shortened from 17.2–19.1 h to less than 5.5 h, while the 3-day compressive strength increased by more than 16-fold. Mechanistic analysis revealed that isothermal calorimetry detected a distinct exothermic peak at 8.3 h, with the heat flow peak intensity increasing by 5.6 times and the cumulative heat release rising by 1.2 times. Additionally, CS elevated the system pH from 11.4 to 12.5, promoting the dissolution of desulfurization gypsum and accelerating the formation of ettringite and calcium alumino-silicate hydrate C-(A)-S-H gels. As the SS content increased, the enhancing effect of CS gradually diminished. This study provides an effective approach to addressing the early-age performance deficiencies of SBDC systems with low SS content.