Ullah Salamat, Qabur Ali, Ullah Ansar, Aati Khaled, Abdelgiom Mahmoud Abdelrahim
Key Lab of CAD & CG, Laboratory of Soft Machines and Smart Devices of Zhejiang Province & Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, China.
Department of Civil and Architectural Engineering, Jazan University, Jazan 45142, Saudi Arabia.
Polymers (Basel). 2024 Aug 24;16(17):2399. doi: 10.3390/polym16172399.
Previous studies indicate that traditional asphalt mixtures lack the ability to withstand the stresses caused by heavy traffic volumes under high temperatures. To enhance the rutting resistance of flexible pavement under high levels of temperature and loading, extensive laboratory experiments were carried out. A 60/70 grade bitumen was used as a neat sample for comparison. The study introduced three distinct polymers, polypropylene (PP), low-density polyethylene (LDPE), and acrylonitrile butadiene styrene (ABS), at varying concentrations by weight into the neat bitumen. Initially, conventional tests were performed to evaluate the conventional properties of both the neat and modified bitumen, while aggregate tests assessed the mechanical properties of the aggregates. Subsequently, a Marshall mix design was performed to determine the optimum bitumen content (OBC) in the asphalt mixture. Finally, wheel-tracking tests were performed under a specific load and temperature to investigate the rutting behavior of the modified asphalt mixtures. The results of this comprehensive study revealed that the modified asphalt mixtures displayed improved resistance to rutting compared to the neat asphalt mixture. Furthermore, it was also observed that the LDPE exhibited a superior performance against rutting, followed by the PP and ABS. At polymer contents of 3%, 5%, and 7%, the LDPE achieved reductions in rut depth of 13%, 24%, and 33%, respectively, outperforming both PP- and ABS-modified asphalt. These findings not only enhance our understanding of asphalt behavior under diverse conditions but also highlight the potential of plastic-modified asphalt as an effective solution for mitigating rutting problems in road pavements. By incorporating plastic modifiers into asphalt mixtures, this approach aligns with the principles of sustainable construction by reducing plastic waste while improving pavement durability and performance.
以往的研究表明，传统沥青混合料缺乏承受高温下大量交通荷载所产生应力的能力。为提高柔性路面在高温和重载条件下的抗车辙性能，开展了大量室内试验。采用60/70级沥青作为纯样进行对比。该研究将三种不同的聚合物，即聚丙烯（PP）、低密度聚乙烯（LDPE）和丙烯腈-丁二烯-苯乙烯共聚物（ABS），按不同重量浓度加入到纯沥青中。首先，进行常规试验以评估纯沥青和改性沥青的常规性能，同时进行集料试验以评估集料的力学性能。随后，进行马歇尔混合料设计以确定沥青混合料的最佳沥青用量（OBC）。最后，在特定荷载和温度下进行车辙试验，以研究改性沥青混合料的车辙行为。这项综合研究的结果表明，与纯沥青混合料相比，改性沥青混合料的抗车辙性能有所提高。此外，还观察到LDPE表现出卓越的抗车辙性能，其次是PP和ABS。在聚合物含量为3%、5%和7%时，LDPE的车辙深度分别降低了13%、24%和33%，优于PP和ABS改性沥青。这些发现不仅增进了我们对不同条件下沥青性能的理解，还突出了塑料改性沥青作为缓解道路路面车辙问题的有效解决方案的潜力。通过将塑料改性剂掺入沥青混合料中，这种方法符合可持续建设的原则，既能减少塑料废物，又能提高路面的耐久性和性能。
