The fatigue fracture behaviour of hot asphalt mixtures (HMA) has been studied using a newly proposed semi-circular bending (SCB) test. Fracture properties of asphalt mixtures are currently being evaluated using the SCB test with the application of fracture mechanic concepts to characterise fatigue behaviour. This article reviews studies regarding the intermediate temperature fracture resistance of various asphalt mixtures to evaluate and correlate these fracture properties to cracking performance such as fundamental assessment of fracture through the SCB tests. Results of the experimental research work in Utah show that the expected variability of these tests exceeds the range of values observed. Therefore, the within-laboratories repeatability and reproducibility between different laboratories of the SCB tests in Utah were not desirable. Thresholds established for the slope of toughness (J_c) and flexibility index value need modification to be applied as a tool to reject or accept the results for different asphalt mixtures.

使用新提出的半圆弯曲 (SCB) 试验研究了热沥青混合料 (HMA) 的疲劳断裂行为。目前正在使用 SCB 测试评估沥青混合料的断裂性能，并应用断裂力学概念来表征疲劳行为。本文回顾了有关各种沥青混合物的中温抗裂性的研究，以评估这些断裂特性并将其与开裂性能相关联，例如通过 SCB 测试对断裂进行基本评估。犹他州的实验研究工作结果表明，这些测试的预期可变性超出了观察到的值范围。因此，犹他州 SCB 测试的不同实验室之间的实验室内可重复性和再现性是不可取的。_c ) 和弹性指数值需要修改，以作为拒绝或接受不同沥青混合物结果的工具。