Evaluation of the engineering properties of asphaltic concrete composite produced from recycled asphalt pavement and polyethylene plastic

This study investigated the suitability of recycled asphalt pavement and polyethylene wastes as coarse aggregate in asphaltic concrete by evaluating the impact of the use of polyethylene polymer wastes and recycled asphalt pavement composite as aggregates on the physical and mechanical properties of the asphaltic concrete. The physical characteristics of the aggregate and bitumen were determined using relevant parametric tests. Recycled asphalt pavement was used to make asphaltic concrete samples using LDPE at 5%, 10%, 15%, RAP at 5% and HDPE at 5%, 10%, 15%, and a mixture of LDPE + HDPE at 5+5%, 7.5+7.5% and 10+10% RAP at 5% as additives. Marshall Stability test was conducted to assess the mechanical strength of the asphaltic concrete, and the results included information on the aggregate’s stability, flow, density, voids filled with bitumen, voids filled with air, and voids in mineral aggregate. In addition, the surface and crystal structure of the aggregates was studied by carrying out a microscopic examination with a Scanning Electron Microscope (SEM) and X-Ray diffraction (XRD). The results obtained from this study demonstrated that RAP, HDPE & LDPE are viable conventional aggregate substitute for asphalt concrete production.

本研究探讨了回收沥青路面及聚乙烯废弃物作为沥青混凝土粗集料的使用适宜性，通过评估聚乙烯聚合物废弃物与回收沥青路面复合集料对沥青混凝土物理和力学性能的影响。采用相关参数测试确定了集料和沥青的物理特性。使用LDPE在5%、10%、15%的比例下，以及RAP在5%的比例下，以及HDPE在5%、10%、15%的比例下，以及LDPE与HDPE的混合物在5+5%、7.5+7.5%和10+10%的比例下作为添加剂，制作了沥青混凝土样品。通过马歇尔稳定度试验对沥青混凝土的力学强度进行了评估，结果包含了集料稳定性、流动性、密度、沥青填充空隙、空气填充空隙和矿物集料中的空隙等信息。此外，通过扫描电子显微镜（SEM）和X射线衍射（XRD）进行微观检查，研究了集料的表面和晶体结构。研究结果表明，RAP、HDPE和LDPE是沥青混凝土生产的可行传统集料替代品。