ABSTRACT

Environmental issues and fluctuations in the price of asphalt binders have increased the demand in usage of reclaimed asphalt pavement (RAP) material for asphalt mixtures. The RAP binder, nevertheless, is often highly aged and has several drawbacks, for instance, low cracking resistance, low workability, and low fatigue in the resulting mixtures. These issues can be resolved by using rejuvenators. As such, this research work assessed the engineering properties of reclaimed hot-mix asphalt (HMA) mixture rejuvenated by maltene-derived asphalt. The tests examined Marshall properties, moisture damage, resilient modulus (M_R), dynamic creep, Cantabro loss, and rutting resistance, including the stripping and coating tests. The results showed that maltene had been effective in mitigating the aging effect of RAP asphalt, while the rejuvenated mixture exhibited considerable enhancement, especially when compared to the virgin and RAP mixtures without maltene. A simple cost analysis revealed that maltene was cost-effective as it compensated for the adverse effects of RAP, hence can be used to raise the content of RAP in asphalt mixture.

摘要

环境问题和沥青结合料价格的波动增加了对再生沥青路面 (RAP) 材料用于沥青混合料的需求。然而，RAP 粘合剂通常是高度老化的并且具有几个缺点，例如，所得混合物的抗裂性低、可加工性低和疲劳度低。这些问题可以通过使用再生剂来解决。因此，本研究工作评估了由麦芽烯衍生沥青再生的再生热拌沥青 (HMA) 混合物的工程特性。测试检查了马歇尔特性、湿气损伤、弹性模量 (M _R)、动态蠕变、Cantabro 损耗和抗车辙性能，包括剥离和涂层测试。结果表明，maltene 可有效缓解 RAP 沥青的老化效应，而再生混合物表现出显着的增强效果，特别是与未使用 maltene 的原始混合物和 RAP 混合物相比。简单的成本分析表明，麦芽烯具有成本效益，因为它补偿了 RAP 的不利影响，因此可用于提高沥青混合料中 RAP 的含量。