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<p>Supersulfated cement (SSC) is a promising low-carbon cementitious material and is generally composed of ground granulated blast furnace slag (GGBFS), gypsum, and Portland cement (PC). However, the increasing costs of GGBFS necessitates alternative raw materials to enhance sustainability. Given that blast furnace ferronickel slag (FNS) shares a similar CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> composition with GGBFS and exhibits latent hydraulic reactivity, it presents a viable substitute for GGBFS in SSC production. Therefore, this study investigates the feasibility of using FNS, phosphogypsum (PG), and PC to formulate FNS-based SSC mortar, with varying FNS-to-PG ratios. The research systematically examines the early-age hydration kinetics, phase evolution, microstructural development, and mechanical properties of the synthesized SSC. The results reveal that the primary hydration products of FNS-based SSC are ettringite and Calcium-silicate-hydrates (C–S–H) gel, consistent with conventional SSC. A higher PG content extends the induction period and delays the formation of early hydration products. However, increasing PG content enhances the 28-day compressive strength, reaching over 47&#xa0;MPa when PG constitutes 30% of the binder. These findings provide a scientific basis for the development of sustainable FNS-based SSC.</p> Graphical Abstract <p></p>

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Preparation of Blast Furnace Ferronickel Slag-Based Supersulfated Cement with Different Proportions of Phosphogypsum

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Wenxin Lyu,
  • Jiazhan Wei,
  • Zijian Ouyang,
  • Chengqiang Zhang,
  • Y. Sun

摘要

Supersulfated cement (SSC) is a promising low-carbon cementitious material and is generally composed of ground granulated blast furnace slag (GGBFS), gypsum, and Portland cement (PC). However, the increasing costs of GGBFS necessitates alternative raw materials to enhance sustainability. Given that blast furnace ferronickel slag (FNS) shares a similar CaO-SiO2-Al2O3 composition with GGBFS and exhibits latent hydraulic reactivity, it presents a viable substitute for GGBFS in SSC production. Therefore, this study investigates the feasibility of using FNS, phosphogypsum (PG), and PC to formulate FNS-based SSC mortar, with varying FNS-to-PG ratios. The research systematically examines the early-age hydration kinetics, phase evolution, microstructural development, and mechanical properties of the synthesized SSC. The results reveal that the primary hydration products of FNS-based SSC are ettringite and Calcium-silicate-hydrates (C–S–H) gel, consistent with conventional SSC. A higher PG content extends the induction period and delays the formation of early hydration products. However, increasing PG content enhances the 28-day compressive strength, reaching over 47 MPa when PG constitutes 30% of the binder. These findings provide a scientific basis for the development of sustainable FNS-based SSC.

Graphical Abstract