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<p>The primary purpose of this research is to investigate the performance of stabilized soil with different contents of industrial sludge ash and polyethylene terephthalate (PET) fibers under variable environmental conditions, especially wet-dry cycles. The stabilized samples were subjected to successive wet-dry cycles and evaluated using unconfined compressive strength (UCS) and ultrasonic pulse velocity (UPV) tests. The results showed that combining industrial sludge ash and PET fibers effectively increases the strength and durability of soil against wet-dry cycles. In contrast, unstabilized soil cannot be durable under wet-dry cycles. The stabilized sample with 5% and 8% industrial sludge ash endured seven and eight wet-dry cycles, respectively. On the other hand, adding fibers increased the sample’s durability by up to 12 cycles. The UCS of the sample stabilized with 5% and 8% of industrial sludge ash and reinforced with 0.7% of fibers decreased by 20% and 12%, respectively, after 12 wet-dry cycles. Also, with the increase in the number of wet-dry cycles, the accumulative mass loss of the samples increases; adding fibers reduces the accumulative mass loss under wet-dry cycles. The UPV decreased under wet-dry cycles. So, the UPV of the stabilized sample with 5% and 8% industrial sludge ash after the last wet-dry cycle decreased by 83% and 78%, respectively.</p>

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Eco-friendly Stabilization of Clay Soils Using Sludge Ash and PET Fibers Under Wet–Dry Cycles

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Ali Miarchmandian,
  • Saman Soleimani Kutanaei,
  • Hossein Ghasemnejad,
  • Ali Seyedkazemi,
  • Abdullah Davoudi-Kia

摘要

The primary purpose of this research is to investigate the performance of stabilized soil with different contents of industrial sludge ash and polyethylene terephthalate (PET) fibers under variable environmental conditions, especially wet-dry cycles. The stabilized samples were subjected to successive wet-dry cycles and evaluated using unconfined compressive strength (UCS) and ultrasonic pulse velocity (UPV) tests. The results showed that combining industrial sludge ash and PET fibers effectively increases the strength and durability of soil against wet-dry cycles. In contrast, unstabilized soil cannot be durable under wet-dry cycles. The stabilized sample with 5% and 8% industrial sludge ash endured seven and eight wet-dry cycles, respectively. On the other hand, adding fibers increased the sample’s durability by up to 12 cycles. The UCS of the sample stabilized with 5% and 8% of industrial sludge ash and reinforced with 0.7% of fibers decreased by 20% and 12%, respectively, after 12 wet-dry cycles. Also, with the increase in the number of wet-dry cycles, the accumulative mass loss of the samples increases; adding fibers reduces the accumulative mass loss under wet-dry cycles. The UPV decreased under wet-dry cycles. So, the UPV of the stabilized sample with 5% and 8% industrial sludge ash after the last wet-dry cycle decreased by 83% and 78%, respectively.