Plastic Upcycling by Converting Plastic to Bricks

This study aimed to explore the potential of upcycling plastic waste by incorporating recycled shredded PET bottles into cement mixtures for pavement bricks. The goal was to address the persistent demand and supply of plastics, which frequently contribute to ocean pollution. By substituting traditional aggregates with recycled PET, the research assessed the water absorption, waste conversion, durability, and practical applications of using plastic-enhanced cement mixtures in construction. Mixture #2 demonstrated good water resistance while being lighter than other mixtures, making it an ideal option for applications where reducing weight is critical without sacrificing too much strength. Mixture #1 had the highest plastic content, making it the most aggressive in terms of plastic waste conversion. However, the elevated plastic proportion affected its durability, suggesting it is best suited for projects prioritizing waste reduction over strength. Mixture #4 emerged as the top performer, showcasing the highest durability. Its equal ratio of sand and plastic provided a well-balanced mix that combined structural integrity with optimal weight and water resistance. This makes it the most suitable choice for heavy-duty pavement blocks that require long-lasting performance. Mixtures #3 and #4 achieved a balanced integration of sand and plastic, leading to solid structural properties. Mixture #3’s moderate durability makes it a versatile choice, while Mixture #4’s superior performance highlights the benefits of a carefully optimized sand-to-plastic ratio.