Zero Shear Viscosity of Bitumen-Filler Mastics of Warm-Mix Binders: Fid-Bau Portal

Zero Shear Viscosity of Bitumen-Filler Mastics of Warm-Mix Binders

Behl, Ambika / Chandra, Satish / Aggarwal, V. K. / Gangopadhyay, S.

Warm asphalt has been gaining popularity in recent years around the world due to many reasons, including its energy saving and environmental benefits. Some of the warm-mix additives lower the viscosity of the binder at low temperature, whereas many of those available on the market do not alter the viscosity of the binder but are effective only when mixed with bitumen in the presence of aggregate. Recently there has been considerable interest in the use of zero shear viscosity as a specification criterion for asphalt binders. In this paper, the zero shear viscosity of bitumen-filler mastics modified with two different warm-mix additives (Evotherm and Sasobit) at their four different doses are measured by using a dynamic shear rheometer (DSR) at 40 and 60°C on the basis of the Cross model of calculation. Temperature sweep tests were also conducted to find the failure temperature and the rutting parameter $G^{*} / \sin δ$ at 60°C. From the test results it was observed that the addition of Sasobit increased the ZSV of both binders and of bitumen-filler mastics at the dosage of 3% by weight of asphalt binder and Evotherm additive showed the best results at the dose of 0.5% by weight of asphalt binder.