Recycling the Residue of Medical Waste Incineration as a Filler in Asphalt Paving Mixtures

This study’s major goal is to examine the possibility of using medical waste (MW) incineration as a mineral filler in hot mix asphalt paving mixtures. Four different blends, including a ${\mathrm{CaCO}}_3$ reference mix, were subjected to binder testing, e.g., penetration, ductility, softening point, and rotational viscosity tests. All of the MW mixes contained the Marshall method’s optimal amount of asphalt. The engineering properties, including Marshall stability, indirect tensile strength, tensile strength ratio, and deformation strength in the Kim test, were determined. Chemical analysis results indicate that MW has iron, manganese, copper, zinc, and chromium as transition elements, which react with the asphalt heteroatoms comparable with ${\mathrm{CaCO}}_3$. The results also indicate that the MW-asphalt mastic has lower ductility, softening point, and rotational viscosity than those for ${\mathrm{CaCO}}_3$-asphalt mastic. All MWAC combinations, to a lesser extent, satisfy the minimal ASTM requirements of 8 kN stability, 2–4 mm flow, and 3%–5% air voids at the same optimal binder concentration. Even at 6%, the use of MW as a mineral filler obtained from solid waste in the creation of asphalt paving mixtures is conceivable and feasible.