Abstract: “The rapid population growth in some urban areas has caused major changes in land use, in which many productive agricultural lands have been converted into residential or business. These conditions have reduced the land's ability to absorb and be infiltrated by rainwater particularly during rainy season, resulting flooding and decrease of groundwater. The purpose of this study was to develop the optimum porous asphalt mixture design, which should provide a satisfactory level of load carrying capacity and permeability capability. To achieve the objective, three scenarios of asphalt porous mix designs were conducted using: (a) standard material combined with pyrophyllite, (b) standard material combined with steel slag, (c) varied gradations of standard materials. A total of 60 specimens per scenario (180 total of specimens) were prepared in accordance with the Marshall Test procedures. Each sample is then tested to evaluate its permeability capability and its Marshall characteristics perf”

Keywords: asphalt porous, slag materials, pyrophyllite, Marshall stability, and permeability