Physical and rheological properties of modified sulfur asphalt binder

Abstract

Abstract In this study, asphalt binder was partially substituted with different percentages of modified sulfur (20%, 30%, and 40 wt%) to give 20/80, 30/70, and 40/60 sulfur asphalt (S/A) mixtures. The physical properties including softening point, viscosity, penetration, and ductility were examined to characterize the consistency of S/A mixtures. Characterizing the rheological properties of modified asphalt binders is also highly recommended for the prediction of the major pavement damages such as rutting, and cracking. The laboratory studies were conducted to examine the viscoelastic properties of modified sulfur asphalt binder using dynamic mechanical analyzer (DMA), and Brookfield rotational viscometer tests. It was concluded that modified sulfur substituted asphalt mixtures had higher resistance against cracking of the pavement at low temperatures, and least permanent (plastic) deformation at high temperatures.