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<p>The ion leaching from phosphogypsum aggregate can lead to interfacial cracking, which pose significant challenges to stable utilization and serviceability of phosphogypsum in construction products. Hence, this paper endeavors to enhance the interfacial stability of phosphogypsum based composite (PGC) by considering the physical and chemical regulation strategies. Initially, the hydration kinetics and microstructural evolution of PGC are characterized by using <sup>1</sup>H low field nuclear magnetism (<sup>1</sup>H-NMR), scanning electron microscope (SEM) and nanoindentation. Subsequently, the evolution of hydration product volume and pore concentration within PGC is simulated utilizing thermodynamic model (GEMS) to further corroborate the experimental findings. The obtained results reveal that both the pore concentration and the crystal growth accommodation space are significantly influenced by the added water content. Notably, an optimal water content is identified that reconciles the chemical reaction rate with physical accommodation in the ITZ, thereby bolstering the interfacial stability of PGC. In general, based on the outcome of this study, the phosphogypsum aggregate can be well reused in construction field, which guarantees the sustainability and safety simultaneously.</p>

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Development of an environmentally sustainable composite incorporating phosphogypsum aggregate: a perspective for enhancing interfacial stability

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Shiyuan Fu,
  • Chiqiu Wu,
  • Wei Lv,
  • Yuan Feng,
  • Xue Liu,
  • Yuxin Zhou,
  • Kangning Liu,
  • Rui Yu

摘要

The ion leaching from phosphogypsum aggregate can lead to interfacial cracking, which pose significant challenges to stable utilization and serviceability of phosphogypsum in construction products. Hence, this paper endeavors to enhance the interfacial stability of phosphogypsum based composite (PGC) by considering the physical and chemical regulation strategies. Initially, the hydration kinetics and microstructural evolution of PGC are characterized by using 1H low field nuclear magnetism (1H-NMR), scanning electron microscope (SEM) and nanoindentation. Subsequently, the evolution of hydration product volume and pore concentration within PGC is simulated utilizing thermodynamic model (GEMS) to further corroborate the experimental findings. The obtained results reveal that both the pore concentration and the crystal growth accommodation space are significantly influenced by the added water content. Notably, an optimal water content is identified that reconciles the chemical reaction rate with physical accommodation in the ITZ, thereby bolstering the interfacial stability of PGC. In general, based on the outcome of this study, the phosphogypsum aggregate can be well reused in construction field, which guarantees the sustainability and safety simultaneously.