This work presents the development of new fatigue performance indices for asphalt binders based on viscoelastic continuum damage (VECD) theory and failure energy. Five plant-produced asphalt mixtures were subjected to three different conditioning levels (short-term ageing during production and loose mix ageing for 5 and 12 days at 95°C in the laboratory) and the corresponding binders were extracted and recovered. Direct Tension Cyclic Fatigue (DTCF) tests were performed on the mixtures to characterise the mixture fatigue properties using the simplified viscoelastic continuum damage (S-VECD) analysis approach. Frequency and temperature sweep tests and the Linear Amplitude Sweep (LAS) test using a Dynamic Shear Rheometer (DSR) were conducted on the recovered binders to evaluate the binder rheological and fatigue properties. Three new performance indices are explored from the LAS test: Strain Tolerance (ε_T), Strain Energy Tolerance (Ε_f), and Average Reduction in Integrity to Failure (I^R). These indices were used to track the evolution of binder fatigue properties with ageing. A unique aspect of these indices is that they capture the failure point of the binder during the LAS test and combine the stress and strain histories of the material. Compared with the traditional A and B parameters from the LAS test, the new indices show a consistent decrease in the fatigue properties of the binders with ageing. The newly proposed parameters show improved correlations with mixture fatigue performance index (D^R) from the DTCF test, indicating their potential for evaluation of asphalt mixture fatigue properties. In addition, the new indices developed from this study have been shown to effectively capture the ageing gradient within the pavement structure and can also be used together with the binder rheological indices (e.g. G-R parameter and ΔTc) to evaluate both environmental and fatigue cracking of asphalt pavements at the same time.

这项工作提出了基于粘弹性连续损伤 (VECD) 理论和失效能量的沥青结合料新疲劳性能指标的开发。对五种植物生产的沥青混合料进行三种不同的调理水平（生产过程中的短期老化和实验室 95°C 下 5 天和 12 天的松散混合料老化），并提取和回收相应的粘合剂。使用简化的粘弹性连续损伤 (S-VECD) 分析方法对混合物进行直接拉伸循环疲劳 (DTCF) 测试，以表征混合物的疲劳特性。使用动态剪切流变仪 (DSR) 对回收的粘合剂进行频率和温度扫描测试以及线性振幅扫描 (LAS) 测试，以评估粘合剂的流变和疲劳性能。ε _T )、应变能容差 ( Ε _f ) 和失效完整性的平均降低 ( I ^R )。这些指数用于跟踪粘合剂疲劳性能随老化的演变。这些指数的一个独特方面是它们在 LAS 测试期间捕获粘合剂的失效点，并结合材料的应力和应变历史。与来自 LAS 测试的传统 A 和 B 参数相比，新指标显示粘合剂的疲劳性能随着老化而持续下降。新提出的参数显示出与混合物疲劳性能指数（D ^R) 来自 DTCF 测试，表明它们在评估沥青混合料疲劳性能方面的潜力。此外，本研究开发的新指标已被证明可以有效地捕捉路面结构内的老化梯度，并且还可以与粘合剂流变指标（例如 GR 参数和ΔTc）一起用于评估环境和疲劳开裂同时铺设沥青路面。