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<p>The sensitivity of bio-based materials to moisture and biological agents limits their use in tropical regions. This study evaluates the durability of gypsum-based composites reinforced with pineapple leaf fibres, subjected to accelerated ageing in a humid atmosphere saturated at 91% RH and in a fungal environment on Sabouraud medium (pH 5.6). A D-optimal design was used to analyse the combined effects of fibre volume fraction, conditioning time, and type of ageing medium on six properties: mass gain, density, volumetric deformation, flexural strength, and modulus of elasticity. Increasing fibre content promotes water absorption, with mass gains of up to 12% in humid conditions and 70% in a fungal environment, associated with notable mechanical degradation (elastic modulus reduced by up to 30% and hardness by up to 25% after six months). Antagonistic effects were observed: at low content (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:&lt;\)</EquationSource> </InlineEquation>1 ), fibres maintain internal cohesion, while at high content and longer durations, hyphae and spore penetration at the fibre-gypsum interface weakens the matrix. Polynomial models (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:{R}^{2}&gt;\)</EquationSource> </InlineEquation> 0.90) reliably predict property variations and support optimisation of fibre dosage. Microscopic analyses confirmed these alterations and provide a framework for optimising the use of gypsum–fibre composites in humid or tropical environments.</p>

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Biodeterioration of gypsum pineapple fibre composites subjected to accelerated humid and fungal ageing

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月28日

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  • Achille Désiré Betené Omgba,
  • Julien Clerc Obam,
  • Suzie Viviane Obame,
  • Florian Martoïa,
  • Remy Legrand Ndoumou Belinga,
  • Cheryle Manfouo Tchoupmene,
  • Christel Cedrig Laris Nsi Ongo,
  • Fabien Betené Ebanda,
  • Atangana Ateba,
  • Pierre J. J. Dumont

摘要

The sensitivity of bio-based materials to moisture and biological agents limits their use in tropical regions. This study evaluates the durability of gypsum-based composites reinforced with pineapple leaf fibres, subjected to accelerated ageing in a humid atmosphere saturated at 91% RH and in a fungal environment on Sabouraud medium (pH 5.6). A D-optimal design was used to analyse the combined effects of fibre volume fraction, conditioning time, and type of ageing medium on six properties: mass gain, density, volumetric deformation, flexural strength, and modulus of elasticity. Increasing fibre content promotes water absorption, with mass gains of up to 12% in humid conditions and 70% in a fungal environment, associated with notable mechanical degradation (elastic modulus reduced by up to 30% and hardness by up to 25% after six months). Antagonistic effects were observed: at low content ( \(\:<\) 1 ), fibres maintain internal cohesion, while at high content and longer durations, hyphae and spore penetration at the fibre-gypsum interface weakens the matrix. Polynomial models ( \(\:{R}^{2}>\) 0.90) reliably predict property variations and support optimisation of fibre dosage. Microscopic analyses confirmed these alterations and provide a framework for optimising the use of gypsum–fibre composites in humid or tropical environments.