Impact of Waste HDPE on Bitumen Properties

The rapid increase in plastic consumption, particularly High-Density Polyethylene (HDPE), has resulted in mounting environmental concerns due to its non-biodegradable nature. In parallel, the search for improved materials in road construction has led to growing interest in polymer-modified bitumen. This research investigates the influence of waste HDPE on the fundamental properties of bitumen with the aim of enhancing pavement performance while promoting sustainable waste management practices. Waste HDPE was blended with bitumen in proportions 3%, 6%, 9% and the modified samples were subjected to a series of conventional tests, including penetration, softening point and ductility assessments. The findings reveal that HDPE modification significantly alters the rheological behavior of bitumen, yielding a binder with increased stiffness, higher softening point, and reduced temperature susceptibility. These modifications suggest enhanced resistance to rutting and deformation under heavy traffic loads. The study underscores the dual benefit of utilizing plastic waste in road construction, mitigating environmental pollution and improving the longevity of flexible pavements.