Dynamic viscosity of road bitumens as an alternative of softening point
Abstract
The research sought to find the most suitable replacement for softening point among the viscosities of two types of road construction bitumen measured using three methods (Brookfield and capillary dynamic, and DSR complex). The temperature was selected based on the values recommended for dynamic viscosity and complex viscosity measurements in the EN 12 591-2009 and AS 2008-2013 specifications for road construction bitumen, which was 60 °C. Changes in shear rate significantly affect complex viscosity values. A better correlation was found between the softening point converted from the viscosities measured and the actual measured softening point at a frequency of 1 rad/sec than at a frequency of 10 rad/sec.
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