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Effects of waste polyethylene terephthalate bottle particles on cement-bonded wood boards
Summary
Researchers found that grinding up plastic water bottles and mixing them into cement-based building boards (replacing some of the wood) actually made the boards stronger, more water-resistant, and less likely to swell—while also reducing waste sent to landfills. This is a promising way to recycle plastic bottles into sturdier building materials, though the plastic doesn't bond perfectly with the cement, so more testing is needed before it's widely used in construction.
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.