Rheological properties of asphalt binder- Zero Shear Viscosity
Rutting is one of the most common distresses of flexible pavements that has a negative impact on traffic safety and ride comfort. The rutting resistance of asphalt mixtures depends substantially on the bitumen rheological properties. The objective of this paper is to compare the resistance to permanent deformation of bitumen, by using Zero Shear Viscosity (ZSV), tested with frequency sweep and creep and recovery tests, and using Cross, Carreau and Burgersrheological models. Two straight-run bitumens (BIT 50/70 and BIT 70/100) and two polymer modified bitumens (PmB 25 / 55-55 and PmB 45 / 80-65) were tested. The results of the study showed, as expected, that polymer-modified bitumen, has a higher resistance to permanent deformation than straight-run bitumen, and that the use of the ZSV enables comparison and ranking of different bitumens, regardless of the applied model.
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