UTILIZATION OF WASTE POWDER COATING AS A SUSTAINABLE ADDITIVE FOR IMPROVING MECHANICAL AND DURABILITY PROPERTIES OF CONCRETE

By 2025, the global powder coating market is projected to produce 4.35 million tons annually, with nearly 0.42 million tons becoming waste (~9.6%). Recycling waste powder coating (WPC) could help address this issue while supporting sustainability goals. Lightweight concrete reduces cement use by 20% by incorporating waste materials, yet its production still contributes to 8% of global CO₂ emissions. This study examines the effects of adding WPC (0–30 %wt) on the mechanical properties of concrete and mortar under water and heat curing. Results show that, among the used WPC concentrations, 10% WPC enhanced 28-day compressive strength by 57% (heat-cured concrete) and 19% (water-cured), while mortar strength increases by 27% and 12%, respectively. Heat curing melts the polymer, sealing surface pores and improving strength. Brazilian tensile strength also rises significantly (82% for heat-cured concrete) using 10% WPC. FT-IR analysis confirms WPC’s positive impact on hydration. The findings suggest WPC up to 10% can enhance concrete performance while reducing environmental impact.