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<p>Environmental phenomena such as wet-dry and freeze-thaw cycles reduce the durability and strength of high-plasticity (CH) clayey soils. This study investigated the effect of lime and nano-aluminum oxide on the stabilization of CH clayey soils under these conditions. The experiments included evaluating the unconfined compressive strength (UCS), durability, and microstructural behavior of the stabilized soil under wet-dry and freeze-thaw cycles. The results showed that in wet-dry cycles, the UCS of the soil stabilized with 9% lime decreased by 59% after 12 cycles, whereas this reduction was limited to 50% in the mixture of 9% lime and 1.2% nano-Al₂O₃. In freeze-thaw cycles, the UCS decrease of the lime-stabilized samples was 41%, while it decreased to 26% in samples containing the lime and nano-Al₂O₃ combination. In addition, the ultrasonic pulse velocity (UPV) decreased by 52% and 47% after 12 wet-dry and freeze-thaw cycles in the lime-stabilized samples, which improved to 49% and 37%, respectively, with the addition of nano-Al₂O₃. These results show that the combination of lime and nano-Al₂O₃ performs better than lime alone by enhancing internal bonds and reducing degradation. This combination provides an effective solution for stabilizing clay soils under severe environmental conditions.</p>

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Enhancing the Performance of Lime-Stabilized High-Plasticity Clays with Nano-Aluminum Oxide Under Severe Environmental Cycles

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Reza Fahimi,
  • Saman Soleimani Kutanaei,
  • Ali Seyedkazemi,
  • Hossein Motaghedi,
  • Mohammadreza Banihashemi

摘要

Environmental phenomena such as wet-dry and freeze-thaw cycles reduce the durability and strength of high-plasticity (CH) clayey soils. This study investigated the effect of lime and nano-aluminum oxide on the stabilization of CH clayey soils under these conditions. The experiments included evaluating the unconfined compressive strength (UCS), durability, and microstructural behavior of the stabilized soil under wet-dry and freeze-thaw cycles. The results showed that in wet-dry cycles, the UCS of the soil stabilized with 9% lime decreased by 59% after 12 cycles, whereas this reduction was limited to 50% in the mixture of 9% lime and 1.2% nano-Al₂O₃. In freeze-thaw cycles, the UCS decrease of the lime-stabilized samples was 41%, while it decreased to 26% in samples containing the lime and nano-Al₂O₃ combination. In addition, the ultrasonic pulse velocity (UPV) decreased by 52% and 47% after 12 wet-dry and freeze-thaw cycles in the lime-stabilized samples, which improved to 49% and 37%, respectively, with the addition of nano-Al₂O₃. These results show that the combination of lime and nano-Al₂O₃ performs better than lime alone by enhancing internal bonds and reducing degradation. This combination provides an effective solution for stabilizing clay soils under severe environmental conditions.