In a groundbreaking study published in the International Journal of Sustainable Engineering, researchers have unveiled a novel approach to managing polyethylene terephthalate (PET) waste, a significant environmental challenge in today’s construction landscape. The research, led by Sudeep Koirala from the School of Engineering at Pokhara University in Nepal, explores the potential of using residual waste particles generated during PET pellet production in cement mortar.
PET bottles, ubiquitous in modern society, contribute to a staggering amount of waste, with current recycling methods unable to fully mitigate the problem. The study highlights that the production of PET pellets generates about 20-23% waste particles, known as PWP, which often end up in landfills, posing health risks and environmental hazards. “Our research aims to turn this waste into a valuable resource, thereby addressing both waste management and the demand for sustainable construction materials,” Koirala stated.
The study tested the incorporation of PWP into masonry mortar by replacing sand in varying proportions—0%, 5%, 10%, and 15%. The results were promising. At just 5% PWP replacement, the mortar exhibited enhanced properties, including improved flow, reduced water absorption, and increased compressive and flexural strength. Specifically, the 28-day compressive strength saw an impressive increase of 14% and 7.1% for the 1:4 and 1:6 cement-sand ratios, respectively. This performance is attributed to the unique characteristics of PWP, which boasts a smooth, round shape and no water absorption, along with its pozzolanic properties that contribute to mechanical strength.
The implications of this research are significant for the construction industry. As sustainable building practices gain traction, the ability to utilize waste materials not only reduces reliance on virgin resources but also aligns with eco-friendly initiatives. Koirala emphasized, “By integrating PWP into construction materials, we can reduce sand usage and promote a more sustainable approach to building, ultimately benefiting the environment and the economy.”
This innovative solution could pave the way for a shift in construction practices, encouraging the industry to embrace recycling and waste repurposing as standard procedures. As the demand for sustainable construction continues to rise, the findings from this study could inspire further research and development in the field, leading to more environmentally responsible practices across the globe.
For more insights on this research, you can visit Pokhara University.
