Yaseen Ghulam, Hafeez Imran
Department of Civil Engineering, The University of Lahore (Islamabad Campus), Islamabad 44000, Pakistan.
Department of Civil Engineering, University of Engineering and Technology Taxila, Rawalpindi 46000, Pakistan;
Materials (Basel). 2020 Mar 30;13(7):1582. doi: 10.3390/ma13071582.
Asphalt is the most commonly used material for pavement construction around the world, and therefore, it is vital to acquaint a practice that restores the reclaimed asphalt pavement (RAP) binder properties to the required level of performance by adding proper rejuvenators. However, a rejuvenator may perform better in the early stages of its application but may not necessarily perform better in the long run. The aim of this study is to assess the rejuvenation effect on the aging resistance of RAP binder in long-life performance through applying artificial aging. In this study, base virgin binder of pen grade 60/70 and RAP binder rejuvenated with Cereclor were subjected to artificial aging to simulate the short- and long-term aging effects. Penetration, softening point, ductility, and viscosity; saturates, aromatics, resins, and asphaltene (SARA) fractionation; and Fourier-transform infrared (FTIR) spectroscopy, bending beam rheometer (BBR), and dynamic shear rheometer (DSR) tests were conducted to evaluate the potential improvements in various properties of RAP binder. The results indicated that the physical, fractional composition, rheological, and aging resistance of RAP binder improved through the rejuvenation mechanism. Therefore, the rejuvenator improved the chemical structure through re-balancing the constituents in the colloidal system, even after long-term re-aging, which proves it to be an aging-resistant binder. Furthermore, it has been concluded that Cereclor has substantial rejuvenation potential even after applying artificial aging, and it can be utilized in pavement recycling to achieve long-life performance. Furthermore, the results depict good correlations between the physical, rheological, and chemical parameters of virgin and RAP binder.
沥青是全球路面施工中最常用的材料，因此，通过添加适当的再生剂，使回收沥青路面（RAP）结合料性能恢复到所需性能水平的做法至关重要。然而，一种再生剂在应用初期可能表现较好，但从长远来看不一定如此。本研究的目的是通过人工老化评估再生对RAP结合料长期性能抗老化性的影响。在本研究中，对针入度等级为60/70的基础原生结合料和用Cereclor再生的RAP结合料进行人工老化，以模拟短期和长期老化效果。进行了针入度、软化点、延度和粘度测试；饱和烃、芳烃、树脂和沥青质（SARA）组分分析；以及傅里叶变换红外（FTIR）光谱、弯曲梁流变仪（BBR）和动态剪切流变仪（DSR）测试，以评估RAP结合料各种性能的潜在改善情况。结果表明，通过再生机理，RAP结合料的物理性能、组分组成、流变性能和抗老化性得到了改善。因此，即使经过长期再老化，再生剂通过重新平衡胶体体系中的成分改善了化学结构，这证明它是一种抗老化结合料。此外，得出的结论是，即使经过人工老化，Cereclor仍具有显著的再生潜力，可用于路面再生以实现长期性能。此外，结果表明原生结合料和RAP结合料的物理、流变和化学参数之间具有良好的相关性。
