Effects of Liquefied Waste Plastics on Chemical and Rheological Properties of Bitumen

Albert M. Hung, Mingxia Li, Guoxiong Wu, Elham H. Fini
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Abstract

This paper studies the merits of applying liquified polyethylene (PE) as a modifier for bitumen. Chemical recycling of PE is often incomplete and generates some amount of waste “PE oil”. The viscoelasticity and chemical characteristics of bitumen modified with PE oil were examined using dynamic shear rheometry, infrared spectroscopy, and adhesion measurements in comparison and in conjunction with bitumen modified with wax, which is one of the most common additives in warm-mix bitumen. The study found that PE oil softens bitumen without severely increasing the creep compliance or viscoelastic damping properties. Wax-modified bitumen showed enrichment of crystallized alkanes at the free bitumen surface that negatively impacted adhesion and interface healing. The introduction of PE oil to wax-modified bitumen did not appreciably decrease the fraction of crystallized wax. Thus, PE oil may not be effective as an additive for warm-mix wax-modified bitumen. However, the PE oil showed potential in protecting bitumen against ultraviolet (UV) aging, and it is worth further exploration as an anti-aging agent, or as a rejuvenator for reclaimed asphalt pavement. The outcomes of this study promote plastic recycling by presenting the merits of applications of liquefied waste PE in the design and engineering of bituminous composites.
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废塑料液化对沥青化学和流变性能的影响
研究了液化聚乙烯(PE)作为沥青改性剂的优点。PE的化学回收往往不完全,产生一定量的“PE油”废弃物。采用动态剪切流变法、红外光谱法和附着力测量方法对PE油改性沥青的粘弹性和化学特性进行了研究,并与温混合沥青中最常见的添加剂之一蜡改性沥青进行了比较。研究发现,PE油软化沥青,但不会严重增加其蠕变特性或粘弹性阻尼特性。蜡改性沥青在自由沥青表面有丰富的结晶烷烃,这对粘结力和界面愈合产生不利影响。在蜡改性沥青中掺入PE油并没有明显降低蜡的结晶率。因此,PE油可能不能有效地作为热混合蜡改性沥青的添加剂。然而,PE油在保护沥青抗紫外线老化方面显示出潜力,值得进一步探索作为抗老化剂或再生沥青路面的再生剂。本研究结果通过展示液化废PE在沥青复合材料设计和工程中的应用优点,促进了塑料的回收利用。
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来源期刊
Journal of Transportation Engineering
Journal of Transportation Engineering 工程技术-工程:土木
CiteScore
1.22
自引率
0.00%
发文量
0
审稿时长
3.6 months
期刊介绍: Information not localized
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