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<p>Phosphogypsum is a bulk solid waste generated during phosphoric acid production. To address its poor water resistance and frost resistance in constructional material applications, anhydrous phosphogypsum is used as the base material to design polypropylene fiber-slag modified anhydrous phosphogypsum-based concrete (PF-SPC) by varying the content of ground granulated blast furnace slag (GBFS) from 20 to 40% and the volume fraction of polypropylene fiber (PPF) from 0 to 0.5% in the study. Water resistance and frost resistance were adopted as macro-evaluation criteria, combined with microstructural analysis to investigate performance evolution. The results show that increasing the content of GBFS promotes pozzolanic reaction and micro-filling effects, effectively densifying the pore structure. Within the content of the PPF range of 0 to 0.3%, the fibers fully exert bridging and crack-resistant functions, whereas excessive PPF (0.5%) leads to agglomeration and deterioration of pore structure. GBFS and PPF exhibit a synergistic enhancement effect, significantly optimizing the microstructure of concrete and extending its service life. A freeze–thaw damage prediction model based on the Weibull distribution and Aas-Jakobsen model indicates that the optimal mix proportion (40% GBFS, 0.1% PPF) achieves a frost resistance grade of F150, with a predicted service life exceeding 100&#xa0;years in central-southern China. These findings provide theoretical and data support for the resource utilization of phosphogypsum in concrete.</p>

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Deterioration behavior of polypropylene fiber-slag modified anhydrous phosphogypsum-based concrete under freeze–thaw cycles

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Qishi Zhou,
  • Zilin Fang,
  • Yonghui Zhao,
  • Guangcheng Long,
  • Songtao He,
  • Haodi Chen

摘要

Phosphogypsum is a bulk solid waste generated during phosphoric acid production. To address its poor water resistance and frost resistance in constructional material applications, anhydrous phosphogypsum is used as the base material to design polypropylene fiber-slag modified anhydrous phosphogypsum-based concrete (PF-SPC) by varying the content of ground granulated blast furnace slag (GBFS) from 20 to 40% and the volume fraction of polypropylene fiber (PPF) from 0 to 0.5% in the study. Water resistance and frost resistance were adopted as macro-evaluation criteria, combined with microstructural analysis to investigate performance evolution. The results show that increasing the content of GBFS promotes pozzolanic reaction and micro-filling effects, effectively densifying the pore structure. Within the content of the PPF range of 0 to 0.3%, the fibers fully exert bridging and crack-resistant functions, whereas excessive PPF (0.5%) leads to agglomeration and deterioration of pore structure. GBFS and PPF exhibit a synergistic enhancement effect, significantly optimizing the microstructure of concrete and extending its service life. A freeze–thaw damage prediction model based on the Weibull distribution and Aas-Jakobsen model indicates that the optimal mix proportion (40% GBFS, 0.1% PPF) achieves a frost resistance grade of F150, with a predicted service life exceeding 100 years in central-southern China. These findings provide theoretical and data support for the resource utilization of phosphogypsum in concrete.