UTILIZATION OF WASTE POWDER COATING AS A SUSTAINABLE ADDITIVE FOR IMPROVING MECHANICAL AND DURABILITY PROPERTIES OF CONCRETE | ||
| Journal of Al-Azhar University Engineering Sector | ||
| Articles in Press, Corrected Proof, Available Online from 23 October 2025 PDF (1.01 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/auej.2025.380338.1829 | ||
| Authors | ||
| salah galal madbouly* 1; ahmed A Elshami2; hazem F khalil3; Moustafa F bakr3 | ||
| 1Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt. | ||
| 2Housing & Building National Research Centre (HBRC), Dokki, 11511, Giza, Egypt. | ||
| 3Chemistry Department, Faculty of Science, Al-Azhar University, 11884, Nasr City, Egypt. | ||
| Abstract | ||
| 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. | ||
| Keywords | ||
| sustainable concrete; High strength concrete; waste of powder coating (WPC); compressive strength; Brazilian tensile strength | ||
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