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<p>Steel slag (SS), red mud (RM), ground granulated blast slag (GGBS), desulfurization gypsum (DG) and carbide slag (CS) were utilized to prepare steel slag-based solid waste cementitious materials (SS-SWCM) and red mud-based solid waste cementitious materials (RM-SWCM) with the dual objectives of sustainable construction and regional resource utilization. The hydration process and macro–micro characteristics of the two cementitious materials were systematically compared through compressive strength tests, XRD, TG-DTG, FTIR, and SEM analyses. The results revealed that the early strength of SS-SWCM was initially low but exhibited continuous improvement in later strength. Specifically, at a ratio of 0.4 for water to binder (w/b), the compressive strength of the paste could reach up to 47.21&#xa0;MPa after 56&#xa0;days (d). Increasing the amount of SS could improve the early strength to some extent, with a more significant impact on later strength enhancement. In contrast, RM-SWCM demonstrated higher early strength but limited improvement in later strength, achieving a maximum compressive strength of only 24.59&#xa0;MPa at a w/b ratio of 0.4 after 56d. The later strength enhancement of the paste was observed to be more pronounced by increasing the amount of CS, particularly in the growth of compressive strength from 7 to 28d. RM-SWCM relied on externally added calcium hydroxide (CH) to activate the hydration reaction of RM and pozzolanic materials, while SS-SWCM depended on the continuous hydration of SS to generate CH, subsequently activating the hydration reaction of pozzolanic materials. </p>

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Comparison of hydration and macro–micro characteristics of steel slag-based and red mud-based solid waste cementitious materials

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Guoju Ke,
  • Liren Yang,
  • Hao Zhang,
  • Zheyu Li

摘要

Steel slag (SS), red mud (RM), ground granulated blast slag (GGBS), desulfurization gypsum (DG) and carbide slag (CS) were utilized to prepare steel slag-based solid waste cementitious materials (SS-SWCM) and red mud-based solid waste cementitious materials (RM-SWCM) with the dual objectives of sustainable construction and regional resource utilization. The hydration process and macro–micro characteristics of the two cementitious materials were systematically compared through compressive strength tests, XRD, TG-DTG, FTIR, and SEM analyses. The results revealed that the early strength of SS-SWCM was initially low but exhibited continuous improvement in later strength. Specifically, at a ratio of 0.4 for water to binder (w/b), the compressive strength of the paste could reach up to 47.21 MPa after 56 days (d). Increasing the amount of SS could improve the early strength to some extent, with a more significant impact on later strength enhancement. In contrast, RM-SWCM demonstrated higher early strength but limited improvement in later strength, achieving a maximum compressive strength of only 24.59 MPa at a w/b ratio of 0.4 after 56d. The later strength enhancement of the paste was observed to be more pronounced by increasing the amount of CS, particularly in the growth of compressive strength from 7 to 28d. RM-SWCM relied on externally added calcium hydroxide (CH) to activate the hydration reaction of RM and pozzolanic materials, while SS-SWCM depended on the continuous hydration of SS to generate CH, subsequently activating the hydration reaction of pozzolanic materials.