Abstract
Proper fracture characterization of Hot Mix Asphalt (HMA) is crucial to enhance the durability of pavement structures. This work evaluates the influence of the loading rate on the fracture behaviour of a typical dense-graded asphalt mixture and its correspondent mortar or Fine Asphalt Mixture (FAM). Semi-Circular Bending (SCB) tests were conducted under intermediate temperature (24 ± 1 °C), and six different loading rates (i.e., 0.1, 0.5, 5, 10, 25, 50 mm/min). The results show that neither the three-dimensional cracked surface area of the fracture zone of the FAM and HMA samples nor the resistance to crack propagation of the materials were loading rate-dependent, whereas its fracture energy, strength and stiffness were sensitive to this testing condition. Significant differences were also observed in the magnitudes of all cracking parameters within the full mixture and its mortar, as expected, except for the stiffness of the materials.
Published Version
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