Currently the linear amplitude sweep (LAS) test is one of the main fatigue protocols to estimate the fatigue resistance of asphalt binder. In past 10-years, several data interpretation approaches have been developed for the LAS-based binder fatigue modeling. The objective of this paper is to compare the currently available analytical approaches for the data interpretation of LAS test and further investigate the potential links between the different LAS-based fatigue evaluations of asphalt binders. Totally 20 types of unmodified and modified asphalt binders are selected in this study, which actually cover 35 sample conditions under different aging and temperature levels. Experimental and analysis results indicate that the full fatigue performance of asphalt binder can be characterized from with the S-VECD & G R approach. The failure property in LAS test is also well correlated to the binder fatigue life simulation and thus can be utilized to more efficiently distinguish the binder fatigue resistance. Furthermore, the performance predictive accuracy of AASHTO TP101 specification method is strongly dependent on the selected failure definition. Taking the artificial failure definition of 35% reduction in | G *|·sin δ largely underestimates the binder fatigue life when compared to the S-VECD & G R approach. However, when a material-dependent failure definition of peak stress is alternatively employed in specification method, the correlation of the predictive binder fatigue life between the two analytical approaches is significantly improved and a linear relationship is additionally found between the S-VECD & G R approach and specification method. Therefore, it is recommended that when only the standard LAS test with one loading rate is available in practice, the peak stress failure definition should be used in AASHTO TP101 specification method to provide relatively accurate fatigue performance estimation of asphalt binder.

中文翻译：

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使用线性振幅扫描试验对沥青结合料疲劳表征的比较研究

目前，线性振幅扫描 (LAS) 测试是估计沥青结合料疲劳强度的主要疲劳协议之一。在过去的 10 年中，已经为基于 LAS 的粘结剂疲劳建模开发了多种数据解释方法。本文的目的是比较目前可用的 LAS 测试数据解释分析方法，并进一步研究不同基于 LAS 的沥青结合料疲劳评估之间的潜在联系。本研究共选择了 20 种未改性和改性沥青结合料，实际上涵盖了不同老化和温度水平下的 35 个样品条件。实验和分析结果表明，沥青结合料的完整疲劳性能可以用 S-VECD 和 GR 方法表征。LAS 测试中的失效特性也与粘结剂疲劳寿命模拟密切相关，因此可用于更有效地区分粘结剂抗疲劳性。此外，AASHTO TP101 规范方法的性能预测准确性在很大程度上取决于所选的故障定义。以减少 35% 的人工故障定义 | 与 S-VECD 和 GR 方法相比，G *|·sin δ 大大低估了粘结剂疲劳寿命。然而，当在规范方法中交替使用峰值应力的材料相关失效定义时，两种分析方法之间预测粘合剂疲劳寿命的相关性得到显着改善，并且在 S-VECD 和 GR 方法之间还发现了线性关系和规范方法。所以，