Abstract:
The effective inclusion of polypropylene (PPH030) into bitumen during road building is essential
for improving the qualities of the material. This research examined the impact of mixing factors
on the homogeneity and effectiveness of PP-bitumen blends. The experiment conducted by
using granules with a size of 4.3 mm. The mixing process took place at temperatures between
158 and 160°C for a duration of 1.5 hours. Nevertheless, this procedure proved inadequate in
achieving enough blending and uniformity, resulting in the existence of unabsorbed particulate
matter in the mixing nozzle and vessel walls. Further tests were carried out to enhance the
mixing process. The temperature was adjusted to a range of 168-175 °C, and the mixing period
was prolonged to 2 hours. Additionally, the PP content was increased to 4 percent. The findings
showed a significant improvement in consistency, with no visible undissolved particles. In
addition, examination of the mixed samples indicated a rise in the softening point from 53.4 to
61.2 °C when the PP content was increased, accompanied by a loss in penetration and elongation
capabilities. The comparison with prior findings demonstrated that the adjusted circumstances
resulted in a reasonable degree of mixing, as seen by the constant softening point and decreased
penetration and elongation values.
