Effect of Testing Geometry on Measuring Fatigue of Asphalt Binders and Mastics

Fatigue damage is a distress observed in asphalt pavement at moderate to low temperatures due to cyclic loading of moving traffic. Recent developments in binder fatigue research have been made using parallel plate geometry in a dynamic shear rheometer (DSR) to measure total dissipated energy and its change as a function of test cycles. Recent studies, however, have raised questions regarding the temperature level and stiffness level at which true binder fatigue can be measured with the parallel plate geometry in the DSR. It has been claimed that the binder’s stiffness of less than 15 MPa will result in instability failure known as “edge effect,” instead of true fatigue. Edge effect, better known as edge fracture in polymer science, is a normal-force dependent phenomenon which is characterized by the inability of material to maintain its geometry at its boundary with air/atmosphere. This study attempts to investigate further the relationship between binder’s stiffness and true fatigue using parallel plate ...

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