Abstract
With increasing use of recycled materials in paving asphalt mixtures, durability against fatigue cracking has been one of the major concerns in pavement design, construction, and performance. This study was aimed to evaluate the intermediate-temperature fracture/fatigue crack resistance of asphalt mixtures using three test methodologies, namely, semi-circular bend (SCB), Texas overlay, and indirect tension (IDT) tests. The obtained parameters are critical strain energy release rate (Jc), fatigue life (Nf,OT), and dissipated creep strain energy (DCSE), respectively. Three mixture groups were utilized containing reclaimed asphalt pavement (RAP) of up to 40% by recycled binder ratio (RBR). Analysis of variance (ANOVA) was performed on the parameters determined for each mixture group. Mixtures with increased RAP content exhibited reduced fracture/fatigue crack resistance as measured from parameters of tests considered. Further, SCB test was the only one that statistically distinguished all materials from each of the three mixture groups evaluated.
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