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<p>Supersulfated cement (SSC) is a green cementitious material that is extensively utilized as a filling material in construction. Unfortunately, filling materials manufactured with SSC have disadvantages such as low early strength and inferior carbonation resistance. In this paper, the retreated lithium slag (RTLS) with a high concentration of alkali, sulfate and fluoride as a substitute material for gypsum was used to improve the performance of SSC. X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetry (TG) and scanning electron microscopy (SEM) were utilized to analyze the composition of phases and hydration mechanism of the RTLS-SSC system. Results demonstrated that the existence of fluoride in RTLS delayed the hydration of cement. However, the endogenous supplement of alkali metal ions and sulfate from RTLS reacted with calcium hydroxide to form strong alkali, which improved the depolymerization of glassy phase in slag and polymerization of C-(N)-S–H.</p>

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The influence of lithium slag with a high content of alkali, sulfate and fluoride on the performance of supersulfated cement

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Shihong Wei,
  • Dongqing Zhong,
  • Jiaqing Wang,
  • Binbin Qian,
  • Jinfeng Sun,
  • Yueyang Hu,
  • Jin Yang

摘要

Supersulfated cement (SSC) is a green cementitious material that is extensively utilized as a filling material in construction. Unfortunately, filling materials manufactured with SSC have disadvantages such as low early strength and inferior carbonation resistance. In this paper, the retreated lithium slag (RTLS) with a high concentration of alkali, sulfate and fluoride as a substitute material for gypsum was used to improve the performance of SSC. X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetry (TG) and scanning electron microscopy (SEM) were utilized to analyze the composition of phases and hydration mechanism of the RTLS-SSC system. Results demonstrated that the existence of fluoride in RTLS delayed the hydration of cement. However, the endogenous supplement of alkali metal ions and sulfate from RTLS reacted with calcium hydroxide to form strong alkali, which improved the depolymerization of glassy phase in slag and polymerization of C-(N)-S–H.