Abstract
The article presents an analysis of research results on bitumens modified with waste polymers polypropylene (PP) and polyethylene terephthalate (PET). The bitumens were modified under conditions consistent with the Plackett-Burman experimental design by appropriately selecting the mixing process variables. The results of basic tests are presented. The microstructure of bitumens modified with waste polymers was compared with two commercially available bitumens modified with styrene-butadiene-styrene (SBS) copolymer. The analysis of test results revealed certain similarities between laboratory-prepared bitumens and PmB 45/80-55. Modification of road bitumens 20/30 and 70/100 resulted in improvement particularly in the softening point temperature range. Furthermore, modification of certain binder parameters without changing its consistency proved possible. The possibility of polymer particle coagulation at higher homogenizer rotational speeds was also demonstrated.