Experimental Investigation Of Porous Asphalt Pavement

Abstract

Porous asphalt pavement is an open-graded pavement system intended to provide rapid surface drainage through an interconnected void structure while retaining sufficient load-carrying capacity. This study experimentally investigated the constituent materials and laboratory performance of a porous asphalt mixture prepared with crushed aggregates, Ordinary Portland Cement as mineral filler, and VG-30 bitumen. Aggregate characterization included gradation, specific gravity, water absorption, aggregate impact value, and aggregate crushing value. The binder was evaluated by penetration, softening point, ductility, and specific-gravity tests. Five Marshall specimens were assessed for stability, flow, bulk density, air void content, and permeability. The aggregate bulk dry, saturated surface-dry, and apparent specific gravities were 2.68, 2.71, and 2.75, respectively; water absorption was 1.25%, the aggregate impact value was 17.8%, and the aggregate crushing value was 21.5%. The VG-30 binder showed an average penetration of 66 dmm, softening point of 49 degrees C, ductility of 82 cm, and specific gravity of 1.02. Marshall stability averaged 8.78 kN and flow averaged 3.34 mm. The mean air void content was 19.04%, and the mean permeability coefficient was 0.260 cm/s. The reported results indicate that the tested mixture achieved the intended combination of structural response and drainage performance under the laboratory program.