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<p>Natural marl soils are extremely problematic, exhibiting distinct engineering behavior when exposed to moisture. Marl stabilized with cementitious materials has brittle properties. On the other hand, after a certain amount of time has passed since the beginning of the stabilization process, the swelling mineral ettringite forms. Despite extensive research into the effects of reinforcement on stabilized and unstabilized clay soils, there have been few and scattered studies on the reinforcement of lime-modified marls. The purpose of this study is to investigate the effect of polypropylene monofilament fibers on the mechanical and microstructural parameters of lime-stabilized marl. This was accomplished by stabilizing the marl soil with 0, 2, 4, 6, and 8% lime and reinforcing it with 0, 0.25, 0.50, and 1% monofilament fibers with aspect ratio of 120, 240, and 480. Following standard compaction, unconfined compressive strength, and triaxial tests with confining stresses of 100, 300, and 600&#xa0;kPa, the samples were examined microstructurally using scanning electron microscopy, X-ray diffraction, and particle size analysis. The findings show that polypropylene fibers enhance the ductility and mechanical behavior of lime-stabilized marl and limit and regulate the swelling behavior of ettringite mineral by forming an uneven three-dimensional interlocking structure. By adding 0.5% monofilament fibers with a dimension factor of 240 soil and 6% lime, the deviatoric stress increased more than three times that of the marl sample without additives. The optimal amount of materials used was obtained by adding 6% lime and 0.5% fibers with a aspect ratio of 480.</p>

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Mechanical and microstructural response of lime-stabilized marl soil reinforced with monofilament polypropylene fibers

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Hamidreza Zare Dehabadi,
  • Maryam Mokhtari,
  • Mohammad mehdi Khabiri,
  • Mohammad Amiri

摘要

Natural marl soils are extremely problematic, exhibiting distinct engineering behavior when exposed to moisture. Marl stabilized with cementitious materials has brittle properties. On the other hand, after a certain amount of time has passed since the beginning of the stabilization process, the swelling mineral ettringite forms. Despite extensive research into the effects of reinforcement on stabilized and unstabilized clay soils, there have been few and scattered studies on the reinforcement of lime-modified marls. The purpose of this study is to investigate the effect of polypropylene monofilament fibers on the mechanical and microstructural parameters of lime-stabilized marl. This was accomplished by stabilizing the marl soil with 0, 2, 4, 6, and 8% lime and reinforcing it with 0, 0.25, 0.50, and 1% monofilament fibers with aspect ratio of 120, 240, and 480. Following standard compaction, unconfined compressive strength, and triaxial tests with confining stresses of 100, 300, and 600 kPa, the samples were examined microstructurally using scanning electron microscopy, X-ray diffraction, and particle size analysis. The findings show that polypropylene fibers enhance the ductility and mechanical behavior of lime-stabilized marl and limit and regulate the swelling behavior of ettringite mineral by forming an uneven three-dimensional interlocking structure. By adding 0.5% monofilament fibers with a dimension factor of 240 soil and 6% lime, the deviatoric stress increased more than three times that of the marl sample without additives. The optimal amount of materials used was obtained by adding 6% lime and 0.5% fibers with a aspect ratio of 480.