废弃PET塑料改性沥青混合料的室内性能研究

Laboratory Properties of Waste PET Plastic-Modified Asphalt Mixes

摘要: 聚合物改性已被广泛用于提升沥青路面性能，但高成本限制了其大规模应用。废弃聚对苯二甲酸乙二醇酯(PET)塑料作为一种低成本、可持续的添加剂，具有良好的改性潜力。本研究评估了不同掺量废PET对沥青的改性效果，分为改性沥青粘结剂与混合料两个阶段。通过动态剪切流变仪(DSR)和旋转薄膜烘箱试验(RTFOT)分析改性的工程性能和粘弹性行为，采用马歇尔试验和车辙试验评估混合料的力学性能。结果表明，6%~8%的PET掺量能显著提升沥青的刚度与弹性，其中8%掺量的混合料在稳定性与抗车辙性方面表现最佳。

Abstract: Polymer modification has been widely used to improve the performance of asphalt pavements; however, its high-cost limits large-scale application. Waste polyethylene terephthalate (PET) plastic, as a low-cost and sustainable additive, shows great potential for asphalt modification. This study evaluates the modification effects of different PET contents on asphalt, focusing on both the binder and mixture stages. The engineering proper-ties and viscoelastic behavior of the modified binders were analyzed using a dynamic shear rheometer (DSR) and rolling thin film oven test (RTFOT). Marshall and wheel tracking tests were conducted to assess the mechanical performance of the mixtures. The results indicate that a PET content of 6%~8% can significantly enhance the stiffness and elasticity of the asphalt binder. Among them, the mixture with 8% PET exhibited the best performance in terms of stability and rutting resistance.