Parameters to characterise the effects of Sasobit® content on the rheological properties of unaged and aged asphalt binders

Incorporation of warm asphalt additives in conventional asphalt binder affects its rheological properties. This paper presents two Superpave (TM) binder parameters that were used to characterise the rheological properties of PG64 and PG70 asphalt binders blended with various Sasobit (R) contents and subjected to high and intermediate temperatures as well as under different ageing conditions. The parameters used to characterise the binder rheology at high and intermediate temperatures were the non-dimensional viscosity gradient (del eta(S)) and non-dimensional Superpave (TM) rutting parameter (NSRP), respectively). The results indicated that the del eta(S) trends differ depending on binder types, test temperatures and ageing conditions. The NSRP exhibited a significantly different trend for each Sasobit (R) content, depending on binder type and ageing conditions.