A new comprehensive analysis framework for fatigue characterization of asphalt binder using the Linear Amplitude Sweep test

The Linear Amplitude Sweep (LAS) test has become an efficient tool to characterize fatigue resistance of asphalt binders. The existing analysis scheme for this test based on the linear viscoelastic continuum damage (VECD) theory was critically reviewed. Based on the rigorous VECD formulation and experimental evidences, a new comprehensive analysis framework was developed which includes damage characteristic relationship, failure definition, and failure criterion. Compared to the existing approach, the proposed framework provided a more reasonable agreement with experimental observations on fatigue life and a more reliable mathematical description of fatigue failure, and was also capable of unifying both LAS and Time Sweep fatigue tests.