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<p>This study investigates the stabilization of sandy soil using a polymer-based soil treatment (PST) method with carrageenan, a natural biopolymer, and polyvinyl alcohol (PVA), a synthetic water-soluble polymer. The objective is to evaluate their performance under different saturation conditions and determine their potential as sustainable alternatives to cementitious binders. Laboratory tests, including direct shear and water content analysis, were conducted on sand samples treated with various polymer concentrations (1–4%). The results indicate that 4% carrageenan achieved the highest improvement in cohesion (40.82&#xa0;kPa) and friction angle (58.58°), while 3% PVA provided superior strength under low saturation (SR ≈ 13–17%), reaching 395.76&#xa0;kPa and 83.39°. Carrageenan enhanced interparticle bonding through gel bridging, whereas PVA improved pore filling and film formation. Both polymers exhibited saturation-dependent performance, suggesting that optimal treatment should consider moisture conditions. This research demonstrates that combining natural and synthetic polymers can effectively enhance sand stability while promoting eco-friendly, low-carbon geotechnical solutions suitable for sustainable infrastructure development.</p>

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Stabilization of Sandy Soil Using Polymer-Based Soil Treatment Method with Carrageenan and Polyvinyl Alcohol

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Nurwahid Dimas Saputro,
  • Heriansyah Putra

摘要

This study investigates the stabilization of sandy soil using a polymer-based soil treatment (PST) method with carrageenan, a natural biopolymer, and polyvinyl alcohol (PVA), a synthetic water-soluble polymer. The objective is to evaluate their performance under different saturation conditions and determine their potential as sustainable alternatives to cementitious binders. Laboratory tests, including direct shear and water content analysis, were conducted on sand samples treated with various polymer concentrations (1–4%). The results indicate that 4% carrageenan achieved the highest improvement in cohesion (40.82 kPa) and friction angle (58.58°), while 3% PVA provided superior strength under low saturation (SR ≈ 13–17%), reaching 395.76 kPa and 83.39°. Carrageenan enhanced interparticle bonding through gel bridging, whereas PVA improved pore filling and film formation. Both polymers exhibited saturation-dependent performance, suggesting that optimal treatment should consider moisture conditions. This research demonstrates that combining natural and synthetic polymers can effectively enhance sand stability while promoting eco-friendly, low-carbon geotechnical solutions suitable for sustainable infrastructure development.