Effects of Adding Polyethylene Terephthalate (PET) to Dense Bituminous Macadam Mixes Using the Dry Process

This study looked at the mechanical characteristics of dense bituminous macadam mixtures that have been amended using waste plastic bottles (PET). Bitumen content was taken as 4.1–4.9% (with a 0.2% increment), and the amount of PET content was taken as 4–14% (with a 2% increment) of bitumen content. The quantity of bitumen content required for traditional mixes was 4.82%, whereas modified mixes require 4.50%. Reduction in optimum bitumen content and better rutting performance indicates that dense bituminous macadam mixes improve with the addition of PET. This technology is beneficial in an environmentally friendly way.