Abstract: “The use of additional material such as fibers in concrete asphalt mixture may affect the micro structure of the mixture. The micro-structural change is identifiable by the existence of various sub-atomic particles. In general, the study aims to investigate the effect of fibers addition on the micro-structural atomic changes in porous concrete asphalt mixture with asphalt material of oil-based (penetration of 60/70) and of polymer asphalt stabilised with polypropylene. The study was carried out by performing a test on samples by means of XRD (X-ray diffraction) and SEM (scanning electron microscope). The study shows that the petroleum-based asphalt pen 60/70 has compound elements of Carbon (C70), Cyclo-octasulphur monoxide (S8O) and Cristobalite beta (SiO2), while the petroleum-based asphalt pen 60/70 enhanced with polypropylene fibers has compound elements of Carbon (C70), Cyclo-tris(suphur VI)oxide with chemical formula of SO3, Cristobalite beta (SiO2), and Carpathite compound C24H12.”

Keywords: porous concrete asphalt, fiber, micro-structure