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杜   勇

 

（郑州市公路工程公司 ，郑州 450000)

摘   要 ：为了探究聚乙烯  (PE)与植物油复合改性沥青应用的可行性 ，采用针入度、延度、软化点、布氏 旋转黏度、针入度指数试验以及短期老化试验、热重分析试验对PE 植物油复合改性沥青性能进行综合评价。结果表明：PE 可降低基质沥青的针入度与延度，提升软化点与黏度，加入植物油后，随着植物油掺量增大，复合改性沥青针入度与延度逐渐提升，软化点与黏度则呈现降低趋势；PE 可改善沥青的温度敏感性，但植物油掺量 达到 7% 时 PI 值显示其温度敏感性较基质沥青差；PE 可改善沥青的抗热氧老化特性与热分解特性，且适量植物油可进一步提升沥青抗氧老化性能，最佳掺量为 3%。而当植物油掺量增大时，沥青热分解特性逐渐劣化。

关键词：沥青 ；植物油 ；聚乙烯  (PE) ;  物理指标 ；老化 ；热重

中图分类号：U414           

文献标志码：A            

文章编号： 1005- 8249   (2025)  01- 0018- 06 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .01 .004

 

DU Yong

(Zhengzhou City Highway Engineering Company ,  Zhengzhou 450000 ,  China)

Abstract: In order to explore the feasibility of the application of polyethylene (PE) and vegetable oil composite modified asphalt, the performance of PE vegetable oil composite modified asphalt was comprehensively evaluated by penetration, ductility, softening point, Brinell rotational viscosity, penetration index test, short-term aging test and Thermogravimetric analysis analysis test. The results show that PE can reduce the penetration and ductility of the matrix asphalt, and improve the softening point and viscosity; After adding vegetable oil, as the amount of vegetable oil increases, the penetration and ductility of the composite modified asphalt gradually increase, while the softening point and viscosity show a decreasing trend. PE can improve the temperature sensitivity of asphalt, but when the content of vegetable oil reaches 7%, the PI value shows that its temperature sensitivity is worse than that of base asphalt. PE can improve the thermal oxygen aging and thermal decomposition properties of asphalt, and an appropriate amount of vegetable oil can further enhance the oxygen aging resistance of asphalt, with an optimal dosage of 3%. As the amount of vegetable oil increases, the thermal decomposition characteristics of asphalt gradually deteriorate.

Key words: asphalt; vegetable oil; PE; physical indicators; aging; thermogravimetry

作者简介： 杜    勇  (1982—) ,  男，本科，高级工程师，研 究方向：公路、桥梁与隧道工程施工。

收稿日期：2023 - 07 - 28