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<p>This study investigates the impact of F/T (F-T) cycles on the physical and mechanical properties of aeolian sand modified with cement and sisal fiber, critical for infrastructure stability in cold desert regions. F/T cycling, a prevalent environmental challenge in seasonal permafrost zones, induces structural degradation through repeated ice formation and thawing, compromising the durability of cement-stabilized soils. To address this, aeolian sand (95%) blended with cement (5%) and sisal fiber (0%, 0.1%, 0.2% and 0.4%) was cured under 7 days duration (20 ± 1°C, 65% ± 2% relative humidity) and subjected to 0–60 F-T cycles (− 25–35&#xa0;°C). Post-F-T specimens were analyzed via resistivity, longitudinal wave velocity decreased unconfined compression tests. Results revealed that resistivity and wave velocity decreased exponentially with F-T cycles, attributed to pore water conductivity enhancement and crack propagation. Notably, unconfined compressive strength and elastic modulus initially (≤ 20 cycles) increased at low fiber contents (≤ 0.2%) due to ongoing cement hydration offsetting early F-T damage but declined afterward as F-T-included microcracks dominated. Higher fiber content (0.4%) reduced brittleness, enhancing ductility, through excessive cycles (&gt; 20) weakened bonding. Poisson’s ratio (0.30–0.35) slightly rose with cycles, reflecting transverse strain acceleration. Sisal fiber addition improved crack resistance and stress distribution, mitigating brittle failure These findings underscore the necessity of balancing fiber content and F-T resilience for optimizing aeolian sand-modified soil in highway/railway embankments, particularly in arid, temperature-fluctuating environments. The study bridges gaps in understanding F-T effects on fiber-reinforced aeolian sand, offering practical insights for sustainable infrastructure in cold regions.</p>

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Influence of Freeze–Thaw Cycles on Modified Aeolian Sand with Cement and Sisal Fiber

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Jing Xia,
  • Zhandong Su,
  • Xiufeng Ran,
  • Zhicheng Li,
  • Yutao Chu,
  • Mengyuan Li,
  • Xiangwei Sun

摘要

This study investigates the impact of F/T (F-T) cycles on the physical and mechanical properties of aeolian sand modified with cement and sisal fiber, critical for infrastructure stability in cold desert regions. F/T cycling, a prevalent environmental challenge in seasonal permafrost zones, induces structural degradation through repeated ice formation and thawing, compromising the durability of cement-stabilized soils. To address this, aeolian sand (95%) blended with cement (5%) and sisal fiber (0%, 0.1%, 0.2% and 0.4%) was cured under 7 days duration (20 ± 1°C, 65% ± 2% relative humidity) and subjected to 0–60 F-T cycles (− 25–35 °C). Post-F-T specimens were analyzed via resistivity, longitudinal wave velocity decreased unconfined compression tests. Results revealed that resistivity and wave velocity decreased exponentially with F-T cycles, attributed to pore water conductivity enhancement and crack propagation. Notably, unconfined compressive strength and elastic modulus initially (≤ 20 cycles) increased at low fiber contents (≤ 0.2%) due to ongoing cement hydration offsetting early F-T damage but declined afterward as F-T-included microcracks dominated. Higher fiber content (0.4%) reduced brittleness, enhancing ductility, through excessive cycles (> 20) weakened bonding. Poisson’s ratio (0.30–0.35) slightly rose with cycles, reflecting transverse strain acceleration. Sisal fiber addition improved crack resistance and stress distribution, mitigating brittle failure These findings underscore the necessity of balancing fiber content and F-T resilience for optimizing aeolian sand-modified soil in highway/railway embankments, particularly in arid, temperature-fluctuating environments. The study bridges gaps in understanding F-T effects on fiber-reinforced aeolian sand, offering practical insights for sustainable infrastructure in cold regions.