Exploring thermal behavior of recycled polymer-modified bitumen

Abstract

This study explores the modification of 60/70 grade bitumen using recycled low-density polyethylene (R-LDPE) polymer to enhance its thermal performance for flexible pavement. Rutting is a common form of distress in asphalt pavements, predominantly caused by the thermal behavior of bitumen, especially in areas with elevated temperatures. Four modified bitumen binders are prepared with varying R-LDPE content by weight (3%, 4%, 5%, and 6%). The effects of R-LDPE on bitumen are assessed through differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) to investigate the thermal behavior and stability of the modified binders. The primary objective of the research is to evaluate the dispersion of R-LDPE within the bitumen matrix and to conduct a comparative analysis of the thermo-mechanical properties of modified bitumen versus virgin bitumen. The results indicate that adding R-LDPE polymer improves the thermal performance of bitumen, demonstrating superior stability of flexible pavement for hot climates. Results have revealed the best rutting resistance for 6% R-LDPE.Polymer Modified Bitumen (PMB), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), Asphalt, Flexible Pavement