This study aims to (1) determine an optimum amount of Reclaimed Asphalt Pavement (RAP) such that its addition does not adversely impact the fracture resistance of asphalt mixtures, and (2) determine the amount of RAP binder that is active in the total mix. For this purpose, the asphalt mixtures containing three RAP contents (15, 25 and 35%) and their recovered binders were characterized. The binders were subjected to the performance grading, frequency sweep, multiple stress creep and recovery (MSCR) and linear amplitude sweep (LAS) tests. The mixtures were evaluated using dynamic modulus, Hamburg Wheel Tracking (HWT), Flow Number (FN), Semi Circular Bend (SCB), and Ideal Cracking Tolerance (Ideal-CT). The blending efficiency of the RAP binder was determined using the Hirsch model. Based on the performance results and the relatively low binder content of asphalt mixtures in Qatar, it is recommended to use up to 20% RAP in asphalt mixtures.

本研究旨在 (1) 确定再生沥青路面 (RAP) 的最佳用量，使其添加不会对沥青混合料的抗裂性产生不利影响，以及 (2) 确定在总混合料中具有活性的 RAP 粘合剂的量. 为此，对含有三种 RAP 含量（15%、25% 和 35%）的沥青混合料及其回收的粘合剂进行了表征。对粘合剂进行了性能分级、频率扫描、多应力蠕变和恢复 (MSCR) 和线性振幅扫描 (LAS) 测试。使用动态模量、汉堡车轮跟踪 (HWT)、流量 (FN)、半圆弯曲 (SCB) 和理想开裂公差 (Ideal-CT) 评估混合物。RAP 粘合剂的混合效率使用 Hirsch 模型确定。