Xu Fengchi, Zhao Yao, Li Kangjian
College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
Materials (Basel). 2021 Dec 24;15(1):110. doi: 10.3390/ma15010110.
The use of waste products in the production of asphalt binders and asphalt mixtures has become widespread due to economic and environmental benefits. In particular, the use of recycled waste plastic in asphalt binders and mixtures is gaining more attention. This review presents analyses and comparisons of various forms of waste plastic used in asphalt modification, and approaches to incorporating waste plastic into asphalt mixtures, both for single and composite modifications. It focuses on the properties of waste plastics, asphalt binders, and asphalt mixtures. Overall, the incorporation of plastic waste into asphalt mixtures can significantly improve high-temperature performance and has potential economic and environmental benefits. The performance of modified asphalt is highly dependent on multiple factors, such as waste sources, waste plastic dosages, blending conditions, and the pretreatment methods for waste plastic. There are different ways to apply waste plastics to blend into a mixture. In addition, this paper discusses the current challenges for waste plastic-modified asphalt, including the stability, low-temperature performance, modification mechanism, and laboratory problems of the blends. The use of chemical methods, such as additives and functionalization, is considered an effective way to achieve better interactions between waste plastics and the binder, as well as achieving a higher sufficiency utilization rate of waste plastics. Although both methods provide alternative options to produce waste plastic-modified asphalt with stability and high performance, the optimal proportion of materials used in the blends and the microcosmic mechanism of composite modified asphalt are not clear, and should be explored further.
由于经济和环境效益，在沥青结合料和沥青混合料生产中使用废料已变得十分普遍。特别是，在沥青结合料和混合料中使用再生废塑料正受到越来越多的关注。本文综述了用于沥青改性的各种形式废塑料的分析与比较，以及将废塑料掺入沥青混合料的方法，包括单一改性和复合改性。它着重于废塑料、沥青结合料和沥青混合料的性能。总体而言，将废塑料掺入沥青混合料可显著提高高温性能，并具有潜在的经济和环境效益。改性沥青的性能高度依赖于多种因素，如废料来源、废塑料用量、混合条件以及废塑料的预处理方法。有不同的方法将废塑料应用于混合料中。此外，本文还讨论了废塑料改性沥青目前面临的挑战，包括混合料的稳定性、低温性能、改性机理以及实验室问题。使用化学方法，如添加剂和功能化，被认为是实现废塑料与结合料之间更好相互作用以及实现废塑料更高充分利用率的有效途径。虽然这两种方法都为生产具有稳定性和高性能的废塑料改性沥青提供了替代选择，但混合料中所用材料的最佳比例以及复合改性沥青的微观机理尚不清楚，应进一步探索。
