ABSTRACT
The current rheological characterization of asphalt binders mostly uses oscillatory shear based peak stress-strain data. The linear viscoelastic (LVE) limit is also estimated using such data. In order to characterize the complete response of the asphalt binder, it is essential to consider the entire waveform recorded from oscillatory shear testing. In this paper, the response of a modified binder is studied based on the complete waveform recorded during oscillatory shear testing. The waveform was recorded for strain amplitude of 30%, 40% and 50% at the testing temperature of 30°C. Viscoelastic moduli based on the geometry of Lissajous-Bowditch plots were used to study the behaviour of the binder and it was found that the asphalt binder exhibits nonlinearity under such strains. There is a need to study and characterize the nonlinear response of the asphalt binders and incorporate it into the current specifications.
