Exploring the Use of Wood Pellets as a Sustainable Alternative for Indoor Insulation

This study utilized industrial waste in the form of wood pellet shavings as a sustainable alternative for indoor insulation, aiming at improving materials' performance, reducing energy consumption, and promoting efficient waste management. Samples were made with various percentages of wood pellets mixed with clay, sand, and lime at 2%, 5%, and 10%. The physical and mechanical tests revealed that water exposure decreases samples' mechanical and thermal properties. Despite the literature suggesting that a mixture with higher amounts of natural fibers often exhibits lower thermal conductivity, this study found that samples with higher proportions of wood pellets performed worse than expected. The reduction in performance is believed to be due to the increased water input into the mixture during the flow table test. Further, results show that samples with 2% exhibit high thermal conductivity compared to 5% and 10% due to having fewer voids within them than the other mixtures, showing a clear correlation between the wood pellet amount and sample density. This reveals an apparent lack of correlation between the density samples and thermal conductivity. However, given their impressive hygroscopic qualities, the materials show promising solutions as an indoor air regulatory aid.