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Sulfur continues to be favored as a potential asphalt extender in road paving operations. Over the past decade, developments in the field of sulfur/asphalts (S/A) have proceeded at a rapid pace, leading to products and technologies that are currently at the early commercialization stage. In this study, the properties of selected S/A binders mixed with three commonly used mineral fillers (cement, hydrated lime, and crushed limestone fines) were determined using the sliding plate rheometer. Variables have included loading time, temperature, and S/A weight ratio. The results indicate that sulfur has a much greater influence on measured properties such as viscosity and stiffness than mineral fillers alone. S/A binders, with hydrated lime filler, have exhibited higher viscosity and stiffness than binders prepared with cement or limestone fines. The rheometer data, coupled with photomicrographs, support the notion that the morphology of S/A binders with fillers is very different from that of S/A binders alone in terms of potential voids, sulfur recrystallization, and the size of crystal platelets.
rheometer, sulfur asphalt, mineral fillers, viscosity, activation energy, loading time, morphology, sulfur recrystallization
Professor of civil engineering, University of Petroleum and Minerals, Dhahran,
Research scientist, ALCAN, Kingston, Ontario