Fatigue cracking characterisations of waste-derived bitumen based on crack length

Abstract

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Energy-based characterization of the fatigue crack density evolution of asphalt binders through controlled-stress fatigue testing

“…Moreover, the crack initiation of an asphalt binder under rotational shear loading was successfully analyzed based on the Griffith's energy criterion [13]. Particularly, Li et al [18] employed this theory to investigate the crack initiation of waste-derived asphalt binders (e.g., bio-oil modified asphalt and plastic modified asphalt using polyethylene). In this study, Griffith's energy criterion was applied to study the crack initiation length of asphalt binders under different stress levels.…”

“…According to the fitting of the test results with Paris' law, the parameters A and n are obtained to evaluate the fatigue crack performance of asphalt materials. Normally, Paris' law is applied to model the damage growth of a single crack for asphalt mixture [19][20] and for asphalt binder [8,18,[21][22]. However, Paris' law has made the accuracy of crack propagation evaluation for asphalt materials pale because there are a multitude of cracks propagating in asphalt materials under cyclic loading.…”