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Polyurethane asphalt binder: a promising candidate for steel bridge deck-paving material
International Journal of Pavement Engineering ( IF 3.8 ) Pub Date : 2021-05-18 , DOI: 10.1080/10298436.2021.1927028
Meng Jia 1 , Aimin Sha 1 , Jinghui Lin 2 , Zengping Zhang 1 , Bing Qi 3 , Dongdong Yuan 1
Affiliation  

ABSTRACT

To solve the problems of insufficient flexibility and low-temperature cracking resistance of epoxy asphalt binders in steel bridge deck-paving, a segmented linear polyurethane (PU) asphalt binder with thermoplasticity was synthesised via a chain extension reaction between a PU pre-polymer and chain extender in asphalt matrix. Successful synthesis was confirmed through Fourier transform infrared (FT-IR) spectroscopy. A series of tests were conducted to evaluate the properties of PU binders and determine an appropriate formulation. Asphalt binders with high PU contents (30–50%) perform significantly better than the base binder in terms of the high-temperature, low-temperature and mechanical properties. Further, the synthesised PU binder and other frequently used binders, e.g. epoxy and SBS-modified binders, in bridge deck asphalt pavements were compared. Results show that the synthesised PU binder has remarkably better flexibility and low-temperature property, but worse mechanical and high-temperature properties than an epoxy binder. However, the mechanical and high-temperature properties of the synthesised PU binder are substantially better than those of an SBS-modified binder. These results provide useful information for pavement engineers for selecting steel bridge deck-paving materials.



中文翻译:

聚氨酯沥青粘合剂:钢桥面铺装材料的有希望的候选者

摘要

为解决钢桥面铺装中环氧沥青粘结剂柔韧性和低温抗裂性不足的问题,通过聚氨酯预聚物与链的扩链反应合成了具有热塑性的分段线性聚氨酯(PU)沥青粘结剂。沥青基质中的增量剂。通过傅里叶变换红外 (FT-IR) 光谱证实了成功的合成。进行了一系列测试以评估 PU 粘合剂的性能并确定合适的配方。具有高 PU 含量(30-50%)的沥青粘合剂在高温、低温和机械性能方面的性能明显优于基础粘合剂。此外,合成的 PU 粘合剂和其他常用粘合剂,例如环氧树脂和 SBS 改性粘合剂,在桥面沥青路面进行了比较。结果表明,合成的 PU 粘合剂具有明显更好的柔韧性和低温性能,但比环氧树脂粘合剂更差机械性能和高温性能。然而,合成的 PU 粘合剂的机械和高温性能明显优于 SBS 改性粘合剂。这些结果为路面工程师选择钢桥面铺装材料提供了有用的信息。

更新日期:2021-05-18
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