2015•Transportation Research Board 94th Annual MeetingTransportation Research BoardRequires access
Changes in Viscoelastic Characteristics of Asphalt Concrete and Binder due to Aging
A. S. M. Asifur Rahman, Hasan M. Faisal, Rafiqul Alam Tarefder
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Abstract
This study determines changes in viscoelastic properties of asphalt concrete and binder due to aging. In essence, field collected asphalt mixes were used to prepare cylindrical Asphalt Concrete (AC) samples using a laboratory gyratory compactor and samples were subjected to five different aging levels: un-aged, Level 1, Level 2, Level 3, and Level 4. Next, aged samples were tested for viscoelastic material functions such as complex modulus, relaxation modulus, and creep compliance in the laboratory. Using the test data, master curves of related viscoelastic material functions were determined. Results showed that aging affects the viscoelastic materials functions significantly. In addition, liquid asphalt binder corresponding to the mix was tested for complex shear modulus using a dynamic shear rheometer. It is shown that aging affects a binder’s shear modulus and viscosity significantly. It is hoped that the developed master curves of viscoelastic material functions and their variations with aging can be useful for advanced modeling of asphalt pavements in the study of wear and tear.