The worldwide accumulation of plastic waste (PW) has reached concerning proportions, leading to significant economic and environmental difficulties. Regarding this matter, the recycling of plastic waste has become a crucial area of study, especially in the field of modified asphalt as this approach has the potential to address these problems. A significant proportion of PW is derived directly from plastic product manufacturing; thus, these waste streams have superior quality and improved ease of handling. Most common PW streams, made of mostly Low-Density Polyethylene (LDPE), have shown effective incorporation into pavement materials. Consequently, the possibility of using this waste for modifying asphalt becomes achievable by using a suitable pre-processing technique. The main objective of this study is to assess the feasibility of modifying asphalt cement by adding LDPE waste by investigating the thermal characteristics of LDPE in powder form (0.075 to 0.6 mm) using a wet procedure. The research begins with a thermal examination and then comprehensively examines the physio-rheological characteristics of modified asphalt. The results indicate that the use of LDPE powders improves the adhesive strength and ability of asphalt to withstand high temperatures, ultimately, leading to an increase in permanent deformation resistance.