Asphalt concrete (AC) aging reduces the resistance of flexible pavements to fatigue, thermal, and block cracking. Therefore, it is critical to understand the effects of AC aging on flexible pavement serviceability. Binder source has a significant effect on AC long-term aging. Therefore, it is necessary to develop a reliable, practical, and systematic method to quantify the effect of binder source on AC cracking resistance. Seven laboratory mixes were designed and produced at three asphalt binder replacement (ABR) levels using various binders, but same binder performance grade (PG). The AC mixes were tested using the Illinois Flexibility Index Test (I-FIT) under unaged and long-term aged conditions. Standard Superpave tests and temperature-frequency sweep tests, were conducted on virgin binders under various aging conditions. By comparing the binder rheological parameters and flexibility index (FI) of long-term aged AC specimens, the $\Delta T_c$ and m-value after 40-h of aging using a pressure aging vessel (PAV) were identified as valid indicators to reflect the effects of the binder source on AC long-term flexibility. A minimum $\Delta T_c$ of -8°C and m-value of 0.280 were proposed as the preliminary thresholds. A new parameter, $\Delta m$, which is defined as the m-value of 20-h PAV-aged binder minus the m-value of a 40-h PAV-aged binder, correlates well with the aging rate of AC. A binder with a high $\Delta m$ may induce an excessive drop in flexibility after long-term aging.

沥青混凝土（AC）的老化会降低柔性路面对疲劳，热和砌块开裂的抵抗力。因此，了解AC老化对柔性路面可维修性的影响至关重要。粘合剂来源对交流电长期老化有重大影响。因此，有必要开发一种可靠，实用和系统的方法来量化粘合剂源对交流耐开裂性的影响。使用各种粘合剂，但使用相同的粘合剂性能等级（PG），以三种沥青粘合剂替代（ABR）水平设计和生产了七个实验室混合物。使用伊利诺伊州柔韧性指数测试（I-FIT）在未老化和长期老化的条件下测试AC混合物。在各种老化条件下，对原始粘合剂进行标准Superpave测试和温度-频率扫描测试。$\Delta {Ť}_C$使用压力老化容器（PAV）老化40小时后的m值和m值被确定为有效指标，以反映粘合剂源对AC长期柔韧性的影响。最低要求$\Delta {Ť}_C$建议将温度设定为-8°C，将m值设为0.280。一个新参数$\Delta 米$定义为20小时PAV老化粘合剂的m值减去40小时PAV老化粘合剂的m值，它与AC的老化率密切相关。粘合剂含量高$\Delta 米$ 长期老化后可能会导致柔韧性大大降低。