Effects of waste polyethylene terephthalate bottle particles on cement-bonded wood boards

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The objective of this study is to evaluate the potential use of waste polyethylene terephthalate (PET) bottles as a partial replacement for spruce wood particles in cement-bonded wood boards to reduce natural wood consumption and promote plastic waste valorization within a circular economy framework. Boards were produced by replacing spruce wood particles with waste PET bottle particles (0.3–0.5 cm × 1.5–3 cm) at ratios of 0–25%, using filler-to-cement ratios of 1:2 and 1:3. The results indicated that PET particles reduced moisture content, water absorption (44%), and thickness swelling (75%), while increasing board density. PET caused a 37% increase in modulus of rupture and a 47% increase in modulus of elasticity. Scanning electron microscope revealed poor interfacial bonding and limited mechanical interlocking between PET particles and cement hydration products. Thermogravimetric/derivative thermogravimetric, Fourier transform infrared spectroscopy, and energy-dispersive spectrometer indicated that low PET content promoted cement hydration products, whereas excessive PET reduced cement hydration.