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<p>To reduce the freeze–thaw (F/T) -induced cracking susceptibility of in engineering applications, the mechanical performance of polypropylene fiber-reinforced cemented aeolian sand (PCA) under F/T cycles was examined by examining its incorporation of polypropylene fibers at different contents (0%, 0.1%,0.2% and 0.4%). After undergoing 0, 10, 20, and 40 F/T cycles, PCA was subjected to unconfined compressive strength (UCS) test and non-contact strain measurements. Results showed that polypropylene fiber improves PCA's mechanical properties, but effectiveness decreased with F/T cycles. The strength prediction model based on residual strength ratio indicated that PCA with 0.2% fiber content exhibited the best resistance to F/T damage, enhanced ductility, and excellent strength characteristics. This model had high predictive accuracy (<i>R</i><sup>2</sup> = 0.97) and provided a theoretical basis for optimizing fiber content. The surface strain field of PCA implied soil cracks propagation, corresponding with surface cracks. Both F/T cycles and fiber content influenced PCA’s failure mechanisms. This study's results have important reference value for engineering applications of aeolian sand reinforcement in terms of F/T resistance.</p>

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Freeze–Thaw Effects on the Mechanical Behavior of Polypropylene Fiber-Reinforced Cemented Aeolian Sand

  • 期刊论文

  • 发表日期：

    2025年12月9日

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  • Zhandong Su,
  • Xiangwei Sun,
  • Mengyuan Li,
  • Jing Xia,
  • Haihang Wang,
  • Chunguang Cai,
  • Fubiao Zhou

摘要

To reduce the freeze–thaw (F/T) -induced cracking susceptibility of in engineering applications, the mechanical performance of polypropylene fiber-reinforced cemented aeolian sand (PCA) under F/T cycles was examined by examining its incorporation of polypropylene fibers at different contents (0%, 0.1%,0.2% and 0.4%). After undergoing 0, 10, 20, and 40 F/T cycles, PCA was subjected to unconfined compressive strength (UCS) test and non-contact strain measurements. Results showed that polypropylene fiber improves PCA's mechanical properties, but effectiveness decreased with F/T cycles. The strength prediction model based on residual strength ratio indicated that PCA with 0.2% fiber content exhibited the best resistance to F/T damage, enhanced ductility, and excellent strength characteristics. This model had high predictive accuracy (R2 = 0.97) and provided a theoretical basis for optimizing fiber content. The surface strain field of PCA implied soil cracks propagation, corresponding with surface cracks. Both F/T cycles and fiber content influenced PCA’s failure mechanisms. This study's results have important reference value for engineering applications of aeolian sand reinforcement in terms of F/T resistance.