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<p>The recycling of industrial and agricultural wastes for use in producing construction materials and polymer composites is increasingly important for minimizing environmental impacts and ensuring the sustainable use of resources. These materials enhance the performance of composites while promoting sustainability due to their renewable, low-cost, and easily available nature. Among these, wood dust (WD) and walnut shell (WS) are eco-friendly wastes that can be effectively used as fillers in composite production. In this study, hybrid composite (HC) samples were fabricated using WD and WS wastes with a fixed polymer-to-filler ratio of 20:80 by volume. The WD/WS ratios were adjusted to 100:0, 75:25, 50:50, 25:75, and 0:100. The produced HC samples were tested for density, water absorption, porosity, compressive strength (at 10% displacement), ultrasonic pulse velocity (UPV), thermal conductivity, and sound absorption coefficient. Scanning Electron Microscopy (SEM) was also used to analyze the internal structure. The results showed that while individual WD and WS components had limitations, hybridization offered synergistic improvements. WD’s low thermal conductivity (0.1164 Wm⁻¹K⁻¹) and WS’s high compressive strength (4.48&#xa0;MPa) produced a balanced, sustainable composite suitable for thermal insulation and structural applications in the construction industry.</p>

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Performance evaluation of hybrid composite materials with wood powder and walnut shell additives: physical, mechanical, thermal and acoustic properties

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Hasan Polat,
  • Mehmet Nuri Kolak,
  • Müslüm Erol,
  • Hüsnü Aydemir

摘要

The recycling of industrial and agricultural wastes for use in producing construction materials and polymer composites is increasingly important for minimizing environmental impacts and ensuring the sustainable use of resources. These materials enhance the performance of composites while promoting sustainability due to their renewable, low-cost, and easily available nature. Among these, wood dust (WD) and walnut shell (WS) are eco-friendly wastes that can be effectively used as fillers in composite production. In this study, hybrid composite (HC) samples were fabricated using WD and WS wastes with a fixed polymer-to-filler ratio of 20:80 by volume. The WD/WS ratios were adjusted to 100:0, 75:25, 50:50, 25:75, and 0:100. The produced HC samples were tested for density, water absorption, porosity, compressive strength (at 10% displacement), ultrasonic pulse velocity (UPV), thermal conductivity, and sound absorption coefficient. Scanning Electron Microscopy (SEM) was also used to analyze the internal structure. The results showed that while individual WD and WS components had limitations, hybridization offered synergistic improvements. WD’s low thermal conductivity (0.1164 Wm⁻¹K⁻¹) and WS’s high compressive strength (4.48 MPa) produced a balanced, sustainable composite suitable for thermal insulation and structural applications in the construction industry.