湿法改性塑料沥青在路面中的应用综述

Review of the application of wet-process modified plastic asphalt in pavement

塑料在日常生活中普遍使用。由于缺乏合适的废物处理方法,大量废塑料已成为全球主要的环境污染物。美国城市固体废物(MSW)流中最常见的废塑料类型包括高密度聚乙烯(HDPE)、低密度聚乙烯(LDPE)、聚苯乙烯(PS)、聚对苯二甲酸乙二醇酯(PET)、乙酸乙酯(EVA)和聚氯乙烯(PVC)。本文对湿法改性塑料沥青路面中的各种废塑料进行了总结研究。结果表明:掺有废塑料的沥青混合料抗车辙性、抗疲劳性和抗湿性均有所提高。但在塑料改性沥青的应用过程中,仍存在相容性和低温性能问题,针对上述问题可添加聚合物添加剂、化学添加剂和纳米材料来进行改善,以提高沥青混合料的延展性,增加沥青内部的网络结构,改善沥青与废塑料之间的相互作用。

Plastics are commonly used in all aspect in daily life.Lacking suitable approaches for waste treatment,a huge generation of waste plastics will cause the main global environmental issues.The most common types of waste plastics in the US municipal solid waste(MSW)stream include high-density polyethylene(HDPE),low‐density polyethylene(LDPE),polystyrene(PS),polyethylene terephthalate(PET),Ethyl Vinyl Acetate(EVA),and polyvinyl chloride(PVC).This paper comprehensively reviewed various types of waste plastics in asphalt pavement via wet and dry processes.In general,the incorporation of waste plastics into asphalt mixtures presented improvements in rutting resistance,fatigue resistance,and moisture resistance.However,compatibility and low‐temperature performance problems remained during the application of plastic modified asphalt.Different approaches are adopted to improve the above limitations,including polymer additives,chemical additives,and nanomaterials.