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<p>The current study evaluates lime and lime–xanthan gum stabilisation for expansive clay under cyclic wetting–drying. Testing included unconfined compressive strength (UCS), crack intensity factor (CIF), permeability, and moisture retention over multiple cycles. Lime treatment reduced peak surface cracking by 50% (CIF 0.815% vs. untreated 1.63%) and initially eliminated cracks, though cracking increased with cycles. Lime–xanthan gum significantly enhanced moisture retention, maintaining 14% higher water content than untreated clay over cycles. While lime increased permeability by 647%, adding xanthan gum reduced it by 96% (to 1.12 × 10⁻<sup>5</sup>&#xa0;cm/s). The&#xa0;UCS for lime–xanthan gum stabilised clay&#xa0;increased by 396% after 6 cycles, with microstructural analysis confirming improved cohesion. Lime–xanthan gum demonstrates superior permeability control, moisture retention, and potential long-term strength, making it highly suitable for applications like landfill liners and irrigation canals.</p>

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Impact of Dry–Wet Cycles on Mechanical Properties and Surface Cracking of Biopolymer-Lime-Stabilised Clay

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Jiji Krishnan,
  • S. Gowri Lekshmi,
  • S. Manu,
  • Abhishek R. Raj,
  • N. Devika

摘要

The current study evaluates lime and lime–xanthan gum stabilisation for expansive clay under cyclic wetting–drying. Testing included unconfined compressive strength (UCS), crack intensity factor (CIF), permeability, and moisture retention over multiple cycles. Lime treatment reduced peak surface cracking by 50% (CIF 0.815% vs. untreated 1.63%) and initially eliminated cracks, though cracking increased with cycles. Lime–xanthan gum significantly enhanced moisture retention, maintaining 14% higher water content than untreated clay over cycles. While lime increased permeability by 647%, adding xanthan gum reduced it by 96% (to 1.12 × 10⁻5 cm/s). The UCS for lime–xanthan gum stabilised clay increased by 396% after 6 cycles, with microstructural analysis confirming improved cohesion. Lime–xanthan gum demonstrates superior permeability control, moisture retention, and potential long-term strength, making it highly suitable for applications like landfill liners and irrigation canals.