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<p>Geosynthetic liner systems, commonly employed in mining waste containment, often comprise a geomembrane overlying a geosynthetic clay liner. These polymer-based materials are subject to various environmental factors that can alter their properties over the lifespan of a mining waste facility. This study aims to evaluate the chemical and mechanical changes in polyethylene geomembranes and polypropylene fibers within geosynthetic clay liners after exposure to laboratory synthesized copper (acid- based) and bauxite (alkaline-based) mining process solutions. Chemical alterations were assessed using Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS), which indicated an increase in oxidation products (e.g. hydroperoxides, alcohols, esters, and carboxyl groups). X-ray Diffraction (XRD) analysis revealed a rise in polymer crystallinity over time. Mechanical testing, including tensile tests, demonstrated that both polyethylene geomembranes and polypropylene fibers exhibited increased stiffness post-exposure, evidenced by higher elastic modulus, yield strength, and tensile strength, along with reduced strain values. This enhanced stiffness is attributed to the observed increase in polymer crystallinity.</p>

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Acid- and Alkaline-Based Mining Solutions and Stress Induced Chemical and Mechanical Transformations in Geosynthetic Polymers

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • S. A. K. V. M. Piyathilake,
  • Christopher Bareither

摘要

Geosynthetic liner systems, commonly employed in mining waste containment, often comprise a geomembrane overlying a geosynthetic clay liner. These polymer-based materials are subject to various environmental factors that can alter their properties over the lifespan of a mining waste facility. This study aims to evaluate the chemical and mechanical changes in polyethylene geomembranes and polypropylene fibers within geosynthetic clay liners after exposure to laboratory synthesized copper (acid- based) and bauxite (alkaline-based) mining process solutions. Chemical alterations were assessed using Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS), which indicated an increase in oxidation products (e.g. hydroperoxides, alcohols, esters, and carboxyl groups). X-ray Diffraction (XRD) analysis revealed a rise in polymer crystallinity over time. Mechanical testing, including tensile tests, demonstrated that both polyethylene geomembranes and polypropylene fibers exhibited increased stiffness post-exposure, evidenced by higher elastic modulus, yield strength, and tensile strength, along with reduced strain values. This enhanced stiffness is attributed to the observed increase in polymer crystallinity.