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Viscosity grading is currently being practiced in India for the construction of roads where absolute viscosity at 60°C is used as the prime parameter to grade the unmodified bituminous binders apart from other basic properties. It is well known that the unmodified bituminous binders exhibit non-Newtonian characteristics at 60°C. This study focuses on determining the absolute viscosity and the apparent viscosity of a particular grade of bitumen sampled from three different bitumen barrels. The absolute viscosity was measured in accordance with Bureau of Indian standards by a vacuum capillary viscometer using three different tubes including one original Cannon-Manning tube, and two other locally manufactured tubes that were calibrated using the original Cannon-Manning tube. Most of the tubes currently being used in India were manufactured locally and were calibrated with the original Cannon-Manning tube. This resulted in higher variability across the absolute viscosity measured using various tubes. This work tries to quantify such variability and also correlates the absolute viscosity with the apparent viscosity measured using a rotational viscometer. Further, a specific test protocol was adopted to eliminate the time dependency of the binder.

ijtte. international journal for traffic and transport engineering

ESTABLISHING A CORRELATION BETWEEN ABSOLUTE VISCOSITY AND APPARENT VISCOSITY FOR A VISCOSITY GRADE UNMODIFIED BITUMEN USED FOR ROAD CONSTRUCTION IN INDIA