Utilization of modified ash-based mineral powders in asphalt concrete mixtures for enhanced performance and sustainability

This study investigates the feasibility and performance of asphalt concrete mixtures incorporating modified mineral powders derived from technogenic waste, specifically dry and hydro ash, as sustainable alternatives to natural fillers. Three mixture types were prepared: a reference using natural carbonate powder (Mix-1), a mix with dry ash- based powder (Mix-2), and a mix with hydro ash-based powder (Mix-3). The mineral powders were activated with an organo-mineral modifier and tested following national standards. Physical and mechanical tests revealed that Mix-2 and Mix-3 surpassed the reference in several parameters. Mix-3 showed the highest compressive strength (up to 10.7 MPa) and superior water resistance (0.95), while Mix-2 exhibited the best rutting resistance and crack resistance (4.8 MPa). All mixtures met the minimum requirements for internal friction and adhesion. Results confirm that properly processed ash-based powders can replace traditional mineral fillers without compromising performance. The findings support the integration of technogenic waste into road construction for improved sustainability, reduced material costs, and enhanced durability under extreme temperatures.