ABSTRACT

Fourier transformation rheology, geometric parameters from Lissajous-Bowditch plots, and Chebyshev polynomials are some of the techniques used for determining linear and nonlinear response while conducting Large Amplitude Oscillatory Shear (LAOS). In this investigation, LAOS technique is used to characterize the response of an unmodified bituminous binder and mastic. The bituminous binder and mastic are tested at 40°C and subjected to 1 % and 5 % strain amplitude at frequencies of 0.1, 1, and 10 Hz. Lissajous-Bowditch plots based geometric measures are used in this study. The difference in the response of binder and mastic is observed at 10 Hz frequency. The elastic and viscous linear limit is observed to be different for bituminous binder and mastic at 10 Hz frequency. Strain stiffening ratio (S) and shear thickening ratio (T) defined from the geometric measures follow no particular trend across the test conditions.