Plots to Identify the Rheological Properties of Polymer-Modified Warm Mix Binders

The present study describes the use of various plots to identify the rheological properties of polymer-modified warm asphalt binders, which are obtained from the dynamic shear rheometer (DSR). Isothermal Plot, Isochronal Plot, Cole-Cole Diagram, Black diagrams, and Master Curves are presented to detect the occurrence of inconsistencies in rheological data caused by material properties of warm mix additive. Polymer-modified binder (PMB-40) and Sasobit were used to make polymer-modified warm asphalt binder. The Sasobit was added in the dose of 2, 3, and 4% by weight of the binder, and the linear viscoelastic (LVE) region for each binder was determined at an angular frequency of 10 rad/s at a temperature ranging from 20 °C to 70 °C. The frequency sweep test was conducted at different frequencies and temperatures to produce different rheological plots. It is found that the rheological properties of PMB-40 get changed when Sasobit is added. The result further indicates that Williams-Landel-Ferry (WLF) equation which is generally used to calculate the shift factor for the normal binder is not valid for modified warm mix binders and the shift factor for complex modulus is different from that for phase angle.