Mechanical properties evaluation of a dense hot asphalt mixture modified with a residue of low density polyethylene (LDPE)

Abstract

Laboratory tests were used to evaluate the effect on the mechanical properties of a hot asphalt mix (MDC-2 as per INVIAS, 2007 specifications) due to the addition by wet way of a residue of low density polyethylene (LDPE). The strength under monotonic load, resilient modulus, rutting and fatigue strength were evaluated. Asphalt cement (AC) AC 80-100 was used from Colombia. The results show that the monotonic and cyclic mechanical strength evaluated were higher for the mixes modified with LDPE compared with mixtures with asphalts without additives. However, the mixes modified with LDPE undergo less fatigue strength. Additionally, characterization tests were conducted on asphalt cement with and without additive. The LDPE produces higher penetration resistance and viscosity, and lower thermal flow susceptibility.