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<p>This study explores the incorporation of locally available organic waste materials namely, olive pomace, wood wool, and paper into cement- and plaster-based composites for building thermal insulation. In Algeria, olive pomace is produced in large quantities due to extensive olive oil production yet remains underutilized in construction. Eight formulations were prepared with volumetric ratios of 50% cement or plaster, 25–50% olive pomace, and complementary additions of wood wool or paper. The density, thermal conductivity, thermal diffusivity, and specific heat capacity of each composition were experimentally determined. The optimal mixtures C4 and C8, composed of 50% cement and 50% plaster respectively, each combined with 25% olive pomace and 25% paper, exhibited thermal conductivities of 0.238 W/m·K and 0.295 W/m·K, respectively, compared to 1.339 W/m·K for pure cement and 0.4585 W/m·K for pure plaster. Specific heat capacities reached 0.904&#xa0;kJ/kg·K for C4 and 1.172&#xa0;kJ/kg·K for C8. Numerical simulations performed with the Ubakus calculator revealed that replacing pure cement (C1) and plaster (C5) with the optimized mixtures C4 and C8 increased the thermal phase shift from 1.8&#xa0;h to 3.8&#xa0;h and from 2.5&#xa0;h to 4.0&#xa0;h, respectively, while reducing annual heat loss by nearly 45%. Compared to previous agro-waste insulation research, this work is original in both utilizing Algeria’s abundant olive pomace and in quantitatively assessing thermal phase shift, a parameter often overlooked in earlier studies. These results highlight the potential of such composites to enhance summer comfort and energy efficiency in hot-climate buildings, providing an accessible and environmentally sustainable insulation solution.</p>

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Integration of natural organic-based materials for building thermal insulation

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Omar Ketfi,
  • Hamid Abdi,
  • Rabah Brahimi,
  • Ahmed Boudiaf

摘要

This study explores the incorporation of locally available organic waste materials namely, olive pomace, wood wool, and paper into cement- and plaster-based composites for building thermal insulation. In Algeria, olive pomace is produced in large quantities due to extensive olive oil production yet remains underutilized in construction. Eight formulations were prepared with volumetric ratios of 50% cement or plaster, 25–50% olive pomace, and complementary additions of wood wool or paper. The density, thermal conductivity, thermal diffusivity, and specific heat capacity of each composition were experimentally determined. The optimal mixtures C4 and C8, composed of 50% cement and 50% plaster respectively, each combined with 25% olive pomace and 25% paper, exhibited thermal conductivities of 0.238 W/m·K and 0.295 W/m·K, respectively, compared to 1.339 W/m·K for pure cement and 0.4585 W/m·K for pure plaster. Specific heat capacities reached 0.904 kJ/kg·K for C4 and 1.172 kJ/kg·K for C8. Numerical simulations performed with the Ubakus calculator revealed that replacing pure cement (C1) and plaster (C5) with the optimized mixtures C4 and C8 increased the thermal phase shift from 1.8 h to 3.8 h and from 2.5 h to 4.0 h, respectively, while reducing annual heat loss by nearly 45%. Compared to previous agro-waste insulation research, this work is original in both utilizing Algeria’s abundant olive pomace and in quantitatively assessing thermal phase shift, a parameter often overlooked in earlier studies. These results highlight the potential of such composites to enhance summer comfort and energy efficiency in hot-climate buildings, providing an accessible and environmentally sustainable insulation solution.