AASHTO T 391-20涵盖了通过采用系统线性递增荷载振幅的循环荷载测定沥青粘合剂抗疲劳损伤能力。使用动态剪切流变仪（DSR）在根据M 320沥青粘合剂性能等级（PG）确定的中间路面温度下进行振幅扫描。该试验方法可用于使用T 240（RTFOT）和R 28（PAV）老化的粘合剂，以模拟在役沥青路面的老化。

AASHTO T 391-20 covers the determination of an asphalt binders resistance to fatigue damage by means of cyclic loading employing systematic, linearly increasing load amplitudes. The amplitude sweep is conducted using the Dynamic Shear Rheometer (DSR) at the intermediate pavement temperature determined from the performance grade (PG) of the asphalt binder according to M 320. The test method can be used with binder aged using T 240 (RTFOT) and R 28 (PAV) to simulate the aging for in-service asphalt pavements.