Department of Civil Engineering, College of Engineering, Covenant University, Ota, Nigeria.
Department of Process Engineering, Faculty of Engineering, Stellenbosch University, Stellenbosch, South Africa.
PLoS One. 2024 Apr 17;19(4):e0294179. doi: 10.1371/journal.pone.0294179. eCollection 2024.
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.
本研究通过评估聚乙烯聚合物废料和回收沥青路面复合材料作为骨料对沥青混凝土物理和力学性能的影响，探讨了再生沥青路面和聚乙烯废料作为粗骨料在沥青混凝土中的适用性。通过相关参数测试确定了骨料和沥青的物理特性。使用 LDPE 5%、10%、15%、RAP 5%、HDPE 5%、10%、15%以及 LDPE+HDPE 5+5%、7.5+7.5%和 10+10%RAP 5%作为添加剂，制备了再生沥青路面的沥青混凝土样品。马歇尔稳定性试验评估了沥青混凝土的力学强度，结果包括骨料稳定性、流动度、密度、沥青填充空隙率、空气填充空隙率和矿质集料空隙率的信息。此外，还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骨料的表面和晶体结构。本研究结果表明，RAP、HDPE 和 LDPE 是沥青混凝土生产中可行的常规骨料替代物。
