Fatigue Behavior of Bituminous Binders

This paper shows the results of fatigue tests on different types of binders, using a Dynamic Shear Rheometer (DSR). The tests were carried out under controlled stress conditions at 20o C. The stress input signal was a sinusoidal wave of constant amplitude and a frequency of 1.59 Hz. Test measured strain, complex modulus (G*), dissipated energy and Dissipated Energy Ratio (DER) with the number of cycles. To determine binder fatigue failure (DER) criterion was used. Failure was defined as the point where (DER) dropped 10% after peaking. A new parameter, named crack failure energy, was defined.