Jamieson Sean, Verstraten Luke, White Greg
School of Science, Technology and Engineering, University of the Sunshine Coast, Sippy Downs, QLD 4556, Australia.
Materials (Basel). 2025 Jun 26;18(13):3036. doi: 10.3390/ma18133036.
International waste policy promotes the reduction and re-use of waste materials, and in some cases, specifically calls for the use of recycled materials in pavements. In countries like Australia, most of the aircraft pavement network is constructed of flexible pavements. Consequently, understanding the opportunities for recycled materials in flexible aircraft pavements is paramount to increasing the technology uptake. This paper reviews opportunities for the incorporation of recycled materials in flexible airport pavement construction, specifically, their application to particle substitution in unbound and asphaltic layers, use in stabilization treatments, and use as a bitumen modifier. Additionally, environmental product declarations are reviewed to provide a range of typical environmental costs for each recycled material when considering material processing for incorporation into flexible pavements. These materials are compared to virgin material environmental costs to determine which recycled materials provide the highest environmental benefit potential. It was concluded that particle replacement in unbound layers with waste materials had a similar environmental cost to using virgin materials. However, the requirement to dispose of waste material to the landfill can be significantly reduced. For asphaltic layers, recycled asphalt pavement as an asphalt mixture replacement, fly ash as a hydrated lime replacement, and waste plastic and crumbed rubber as a virgin polymer replacement all are effective in reducing the environmental cost. To further increase the technology uptake, a risk-based approach for the implementation of waste materials in airport flexible pavements is recommended, which considers performance testing, the depth of the pavement layer, and the pavement functional area.
国际废物政策促进减少和再利用废料，在某些情况下，还特别要求在路面中使用回收材料。在澳大利亚等国家，大部分飞机跑道网络是由柔性路面构成的。因此，了解柔性飞机跑道中回收材料的应用机会对于提高该技术的采用率至关重要。本文综述了在柔性机场跑道建设中使用回收材料的机会，具体而言，包括它们在无结合料层和沥青层中替代颗粒的应用、稳定化处理中的应用以及作为沥青改性剂的应用。此外，还对环境产品声明进行了综述，以在考虑将材料加工用于柔性跑道时，提供每种回收材料的一系列典型环境成本。将这些材料与原始材料的环境成本进行比较，以确定哪些回收材料具有最高的环境效益潜力。得出的结论是，用废料替代无结合料层中的颗粒与使用原始材料的环境成本相似。然而，可显著减少将废料运往垃圾填埋场处理的需求。对于沥青层，用再生沥青路面替代沥青混合料、用粉煤灰替代熟石灰以及用废塑料和胶粉替代原始聚合物均能有效降低环境成本。为进一步提高该技术的采用率，建议采用基于风险的方法在机场柔性跑道中使用废料，该方法要考虑性能测试、跑道层深度和跑道功能区。
