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<p>This study addresses a research gap in upcycling complex organic-mineral residues by investigating the thermal reactivation of sanding dust (SD) generated during the production of wood-wool cement panels. Its novelty lies in establishing a low-temperature pathway that recovers hydraulic capacity without triggering CO<sub>2</sub> release from carbonated phases. The research design involved heating raw SD at 450 ℃ for five hours - a temperature selected to maximize portlandite dehydration while remaining below the 600 ℃ decarbonation threshold - followed by comprehensive chemical, mineralogical, and physical characterization (XRD, TGA, SEM). This reactivated binder was then utilized to produce novel, low-density biocomposites using manufacturing-line waste as filler. Major findings confirmed that heat treatment reduced average particle size from 29.21&#xa0;μm to 19.11&#xa0;μm and successfully restored hydraulic activity, increasing binder compressive strength from 1.59 to 13.05&#xa0;MPa. The resulting biocomposites achieved compressive strengths up to 185&#xa0;kPa and a low thermal conductivity of 0.068&#xa0;W/(m·K) with a density of 369–415&#xa0;kg/m<sup>3</sup>. These results indicate that 450 ℃ serves as an optimal “thermal window” for this waste, effectively transforming industrial residues into functional secondary raw materials for sustainable building insulation.</p>

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Evaluating the binder performance and biocomposite applications of thermally reactivated wood-wool cement panel waste

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月21日

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  • Pauls P. Argalis,
  • Laura Vitola,
  • Liga Puzule,
  • Xiangming Zhou,
  • Maris Sinka,
  • Diana Bajare

摘要

This study addresses a research gap in upcycling complex organic-mineral residues by investigating the thermal reactivation of sanding dust (SD) generated during the production of wood-wool cement panels. Its novelty lies in establishing a low-temperature pathway that recovers hydraulic capacity without triggering CO2 release from carbonated phases. The research design involved heating raw SD at 450 ℃ for five hours - a temperature selected to maximize portlandite dehydration while remaining below the 600 ℃ decarbonation threshold - followed by comprehensive chemical, mineralogical, and physical characterization (XRD, TGA, SEM). This reactivated binder was then utilized to produce novel, low-density biocomposites using manufacturing-line waste as filler. Major findings confirmed that heat treatment reduced average particle size from 29.21 μm to 19.11 μm and successfully restored hydraulic activity, increasing binder compressive strength from 1.59 to 13.05 MPa. The resulting biocomposites achieved compressive strengths up to 185 kPa and a low thermal conductivity of 0.068 W/(m·K) with a density of 369–415 kg/m3. These results indicate that 450 ℃ serves as an optimal “thermal window” for this waste, effectively transforming industrial residues into functional secondary raw materials for sustainable building insulation.