Stone Mastic Asphalt (SMA) has been broadly used on heavily trafficked roads and motorways in the UK due to its known stability and durability. In this study, several sets of SMA mixtures were produced using different rubberised bitumens, including a Fischer–Tropsch wax pre-treated rubberised bitumen. Properties associated with rutting were evaluated using both linear and nonlinear viscoelastic analyses, using different test methods such as the Strategic Highway Research Programme (SHRP), Shenoy rutting parameter, zero shear viscosity (ZSV) and multiple stress creep recovery (MSCR) tests. The rutting resistance of the resulting SMA mixtures was assessed using the Repeated Load Axial Test (RLAT). The addition of rubber was expected to enhance rutting resistance of these materials. The results indicated that among the binder rutting parameters assessed, the non-recoverable creep compliance (Jnr) computed from the MSCR test, showed the best correlation with the rutting resistance of the corresponding asphalt mixtures. Finally, a more fundamental analysis was provided by assessing the conditions of binder films that would be experienced in the mixtures.

Highlights

• Rutting resistance of binders and mixtures are well correlated when the realistic strain conditions are taken into account

• SMA produced using rubberised bitumens resulted in highly rut resistant mixtures

• MSCR test can measure the rutting resistance of binders

由于众所周知的稳定性和耐用性，Stone Mastic Asphalt (SMA) 已广泛用于英国交通繁忙的道路和高速公路。在这项研究中，使用不同的橡胶沥青生产了几组 SMA 混合物，包括费托蜡预处理的橡胶沥青。使用线性和非线性粘弹性分析评估与车辙相关的性能，使用不同的测试方法，如战略公路研究计划 (SHRP)、Shenoy 车辙参数、零剪切粘度 (ZSV) 和多应力蠕变恢复 (MSCR) 测试。使用重复负载轴向测试 (RLAT) 评估所得 SMA 混合物的抗车辙性能。预计橡胶的添加会提高这些材料的抗车辙性能。结果表明，在评估的粘合剂车辙参数中，由 MSCR 测试计算得出的不可恢复蠕变柔量 (Jnr) 与相应沥青混合料的抗车辙性能具有最佳相关性。最后，通过评估将在混合物中经历的粘合剂膜的条件，提供了更基本的分析。

强调

• 当考虑到实际应变条件时，粘合剂和混合物的抗车辙性能具有很好的相关性

• 使用橡胶沥青生产的 SMA 可产生高度抗车辙的混合物

• MSCR测试可以测量粘合剂的车辙阻力