中国塑料 ›› 2025, Vol. 39 ›› Issue (9): 108-114.DOI: 10.19491/j.issn.1001-9278.2025.09.017

• 塑料与环境 • 上一篇    

改性废旧PET颗粒对沥青及其混合料性能的影响研究

杨帆1,2, 胡一红3, 杨法勇4, 胡斌5, 景宏君1,2, 李海滨1,2()   

  1. 1.西安科技大学建筑与土木工程学院,西安 710054
    2.西安科技大学道路工程研究中心,西安 710054
    3.湖南高速养护工程有限公司,长沙 410000
    4.西安公路研究院有限公司,西安 710065
    5.商洛市公路局,陕西 商洛 726000
  • 收稿日期:2024-09-29 出版日期:2025-09-26 发布日期:2025-09-22
  • 通讯作者: 李海滨,lihaibin1212@126.com
    E-mail:lihaibin1212@126.com

Effect of modified waste PET pellets on performance of asphalt and its mixture

YANG Fan1,2, HU Yihong3, YANG Fayong4, HU Bin5, JING Hongjun1,2, LI Haibin1,2()   

  1. 1.School of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,China
    2.Road Engineering Research Center,Xi’an University of Science and Technology,Xi’an 710054,China
    3.Hunan Highway Maintenance Engineering Co,Ltd,Changsha 410000,China
    4.Xi’an Highway Research Institute Co,Ltd,Xi’an 710065,China
    5.Shangluo Highway Bureau,Shangluo 726000,China
  • Received:2024-09-29 Online:2025-09-26 Published:2025-09-22
  • Contact: LI Haibin E-mail:lihaibin1212@126.com

摘要:

在道路沥青中采用改性后的废旧聚对苯二甲酸乙二醇酯(PET)颗粒作为改性剂,制备PET改性沥青及其混合料。以基质沥青为对照组,分别对4.5 %、5.0 %、5.5 %、6.0 %和6.5 %改性PET颗粒掺量(以基质沥青质量计)的改性沥青进行基本性能测试,确定6.0 %PET颗粒为最佳掺量,相较于基质沥青其针入度降低33.3 %,软化点提升21.1 %,延度下降。然后对该掺量PET改性沥青混合料进行了车辙试验、低温弯曲试验、浸水马歇尔试验和冻融劈裂试验。与基质沥青混合料相比,改性沥青混合料的动稳定度提高151.1 %,抗弯拉强度和抗弯拉应变分别降低5.3 %和6.7 %,残留稳定度比与冻融劈裂强度比与分别提高5.6 %和3.0 %。结果表明,改性PET颗粒可以显著提升沥青混合料的高温稳定性和水稳定性,低温抗裂性有所降低,证明了改性废旧PET能够显著改善道路沥青混合料性能,应用在道路工程中具有可行性,同时为废旧塑料的回收再利用提供了一种新思路。

关键词: 聚对苯二甲酸乙二醇酯, 改性沥青, 沥青混合料, 高温稳定性, 低温抗裂性, 水稳定性

Abstract:

This study investigated the application of modified waste polyethylene terephthalate (PET) pellets as an asphalt modifier for road construction. PET⁃modified asphalt was prepared with varying modifier contents (4.5 %~6.5 % by mass of base asphalt) and systematically evaluated. Comprehensive testing identified 6.0 % PET content as the optimal modifier content, demonstrating significant performance improvements: a 33.3 % reduction in penetration degree, 21.1 % increase in softening point, and decreased ductility compared to base asphalt. Subsequent mixture evaluation through rutting tests, low⁃temperature bending tests, water immersion Marshall tests, and freeze⁃thaw splitting tests revealed enhanced performance characteristics. The modified mixture exhibited 151.1 % greater dynamic stability, along with 5.6 % and 3.0 % improvements in residual stability ratio and freeze⁃thaw splitting strength ratio, respectively. While low⁃temperature crack resistance decreased marginally (5.3 % reduction in flexural tensile strength and 6.7 % in strain), the results indicated that PET modification substantially improved high⁃temperature stability and water resistance of asphalt mixtures. This study validates the technical feasibility of using waste PET in road engineering while providing an effective recycling solution for plastic waste, contributing to sustainable infrastructure development.

Key words: polyethylene terephthalate, modified asphalt, asphalt mixture, high temperature stability, low temperature crack resistance, water stability

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