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.

正确混合热拌沥青（HMA）的断裂特性对于提高路面结构的耐久性至关重要。这项工作评估了加载速率对典型的高密度沥青混合料及其相应的砂浆或细沥青混合料（FAM）的断裂行为的影响。在中温（24±1°C）和六种不同的加载速率（即0.1、0.5、5、10、25、50毫米/分钟）下进行半圆弯曲（SCB）测试。结果表明，FAM和HMA样品的断裂区的三维裂纹表面积和材料的裂纹扩展阻力都不取决于加载速率，而其断裂能，强度和刚度对此测试均敏感。健康）状况。