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<p>For sustainable pavement applications, this study examines the way chemical treatment may enhance the durability of coir geotextiles. Woven (W1, W2) and nonwoven (NW1, NW2) coir geotextiles were chemically treated with a novel formulation made from unsaturated polyester resin (15%), emulsion-based bitumen (10%), methyl ethyl ketone peroxide (1.8%), and styrene monomer as solvent. Five specimens of each type were used to assess the tensile behaviour of untreated and treated geotextiles following 4, 8, and 12 months of carefully regulated exposure in a humidity chamber maintained at (30 ± 2&#xa0;°C; 95 ± 2% RH) to simulate the long-term field conditions. Tensile strength testing revealed that untreated samples experienced 19–30% reduction after 12 months, while treated samples showed only 7–17% reduction, indicating up to 60–70% improvement in strength retention. The initial tensile strength of the treated woven geotextiles increased from 24.5 kN/m to 31.8 kN/m (W1) and 36.2 kN/m to 43.5 kN/m (W2), while nonwoven types improved from 17.6 kN/m to 25.2 kN/m (NW1) and 21.8 kN/m to 28.4 kN/m (NW2). Thermogravimetric analysis indicated an increase in onset degradation temperature from 272&#xa0;°C (untreated) to 305–315&#xa0;°C (treated), confirming enhanced thermal stability. Scanning electron microscopy showed the formation of a continuous hydrophobic coating and filled surface voids, reducing microbial colonization. The treatment proposed here provides a significant improvement in the mechanical and thermal performances for extending the coir geotextiles’ service life by more than 40–50% under accelerated aging conditions. The findings establish treated coir geotextiles as a promising, green alternative to synthetic geosynthetics for pavement reinforcement and other applications in geotechnical engineering.</p>

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Advancing Pavement Durability Through Chemical Treatment of Coir Geotextiles

  • 期刊论文

  • 发表日期：

    2025年12月14日

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  • Vivek,
  • Priya Jaswal,
  • S. K. Sinha

摘要

For sustainable pavement applications, this study examines the way chemical treatment may enhance the durability of coir geotextiles. Woven (W1, W2) and nonwoven (NW1, NW2) coir geotextiles were chemically treated with a novel formulation made from unsaturated polyester resin (15%), emulsion-based bitumen (10%), methyl ethyl ketone peroxide (1.8%), and styrene monomer as solvent. Five specimens of each type were used to assess the tensile behaviour of untreated and treated geotextiles following 4, 8, and 12 months of carefully regulated exposure in a humidity chamber maintained at (30 ± 2 °C; 95 ± 2% RH) to simulate the long-term field conditions. Tensile strength testing revealed that untreated samples experienced 19–30% reduction after 12 months, while treated samples showed only 7–17% reduction, indicating up to 60–70% improvement in strength retention. The initial tensile strength of the treated woven geotextiles increased from 24.5 kN/m to 31.8 kN/m (W1) and 36.2 kN/m to 43.5 kN/m (W2), while nonwoven types improved from 17.6 kN/m to 25.2 kN/m (NW1) and 21.8 kN/m to 28.4 kN/m (NW2). Thermogravimetric analysis indicated an increase in onset degradation temperature from 272 °C (untreated) to 305–315 °C (treated), confirming enhanced thermal stability. Scanning electron microscopy showed the formation of a continuous hydrophobic coating and filled surface voids, reducing microbial colonization. The treatment proposed here provides a significant improvement in the mechanical and thermal performances for extending the coir geotextiles’ service life by more than 40–50% under accelerated aging conditions. The findings establish treated coir geotextiles as a promising, green alternative to synthetic geosynthetics for pavement reinforcement and other applications in geotechnical engineering.