Determination of Resistance to Creep Permanent Deformation of Hot Mix Asphalts Prepared with Various Additives

In this study, the resistance of hot mix asphalts containing different additives to the creep permanent deformation wasinvestigated by the dynamic creep test. Four different additives were used in the study. Styrene-butadiene-styrene (SBS),American Gilsonite (AG), and Iranian Gilsonite (IG) were used for modifying the bitumen. Additionally, the same mixtureswere prepared by using 2% hydrated lime as filler. The samples were subjected to dynamic creep test at 50°C under 500kPa stress level. As a result of the tests performed, it has been determined that all of the additives used in the study improvethe resistance to the creep permanent deformation. It has also been determined that the use of bitumen additives is moreeffective than the use of lime. Furthermore, it has been determined that the most effective additive is IG while the leasteffective additive is SBS, and hydrated lime use is more effective compared to the mixtures prepared with a neat binder.

Keywords:

Creep Permanent Deformation , Hot Mix Asphalt , Modification , Styrene-Butadiene-Styrene , American Gilsonite , IranianGilsonite , Hydrated Lime