Li Mingxia, Fang Yiming, Liu Lingjun, Zhu Qipeng
School of Intelligent Construction and Civil Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China.
Henan Key Laboratory of Green Building Materials Manufacturing and Intelligent Equipment, Luoyang 471023, China.
Materials (Basel). 2025 Aug 15;18(16):3827. doi: 10.3390/ma18163827.
To explore the influence of waste plastics on the self-healing ability of bitumen, the healing effect of multiple damages, and enlarge the utility of waste plastic in pavement through dynamic shear rheology (DSR) tests, multiple repeated loading tests with fatigue-healing-fatigue as the basic cycle were conducted on modified bitumen samples containing five types of waste plastics (PET, HDPE, PP, PS, and PVC) with different dosages. The damage healing ability of bitumen of the same waste plastic with different dosage ratios and the same dosage of different waste plastics under the same healing time, loading strain, and damage degree through single and multiple loading were explored and analyzed. The results show that based on the three sets of data of the complex shear modulus, phase angle, and fatigue factor, the PS and PVC-modified bitumen have a better recovery performance than that of the other three types of modified bitumen, and the latter also has the best fatigue resistance property. To maximize the improvement effect on the healing index of bitumen, the recommended optimal dosages of PET, HDPE, PP, PS, and PVC are 2%, 2%, 2%, 6%, and 4%, respectively. PS has the best promoting effect on the damage healing ability of bitumen after undergoing multiple damages, while PET has the worst improvement effect. The findings can provide theoretical support and guidance for the wide application of waste plastic-modified bitumen pavement.
为探究废塑料对沥青自愈能力及多次损伤愈合效果的影响，并通过动态剪切流变仪（DSR）试验扩大废塑料在路面中的应用，对含有五种不同类型（PET、HDPE、PP、PS和PVC）且不同剂量的废塑料的改性沥青样品进行了以疲劳 - 愈合 - 疲劳为基本循环的多次重复加载试验。通过单加载和多加载方式，探究并分析了相同愈合时间、加载应变和损伤程度下，不同剂量比的相同废塑料以及相同剂量的不同废塑料对沥青损伤愈合能力的影响。结果表明，基于复数剪切模量、相位角和疲劳因子这三组数据，PS和PVC改性沥青的恢复性能优于其他三种改性沥青，且后者还具有最佳的抗疲劳性能。为使对沥青愈合指数的改善效果最大化，推荐的PET、HDPE、PP、PS和PVC的最佳剂量分别为2%、2%、2%、6%和4%。PS对沥青多次损伤后的损伤愈合能力促进效果最佳，而PET的改善效果最差。研究结果可为废塑料改性沥青路面的广泛应用提供理论支持和指导。
