| 摘要: |
| 为探究掺入低密度聚乙烯（LDPE）和乙烯-醋酸乙烯共聚物（EVA） 2种聚合物的复合改性沥青的流变性能，选用掺量为0%、2%、4%的LDPE和掺量为0%、2%、4%、6%、8%的EVA进行复配，制备了14种复合改性沥青.通过流变性能试验、离析试验、傅里叶变换红外光谱（FTIR）等，分析了复合改性沥青的高低温性能及储存稳定性能.结果表明：复合改性沥青的车辙因子和失效温度均较基质沥青有所增大，且当EVA掺量大于4%时，其高温指标高于SBS改性沥青，LDPE与EVA均可大幅改善沥青的高温性能；2种聚合物的掺入对沥青的低温性能改善效果不明显；EVA的掺入能在一定程度上改善复合改性沥青的储存稳定性； LDPE、EVA与沥青之间未发生明显的化学反应. |
| 关键词: 复合改性沥青 高温流变性能 低温流变性能 储存稳定性 |
| DOI：10.3969/j.issn.1007-9629.2022.04.012 |
| 分类号:U414 |
| 基金项目:国家自然科学基金资助项目（51778224） |
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| Rheological Properties of LDPE / EVA Composite Modified Asphalt |
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YAN Kezhen1,2, LI Huili1,2, HONG Zhe1,2, LI Guokai1,2
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1.College of Civil Engineering，Hunan University，Changsha 410082，China;2.Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province， Hunan University， Changsha 410082， China
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| Abstract: |
| In order to investigate the performance of LDPE and EVA， 14 kinds of composite modified asphalt were prepared by 0%，2%，4% LDPE and EVA with 0%，2%，4%，6%，8%，respectively. Rheological test，segregation test and Fourier transform infrared spectroscopy（FTIR）test were applied for their high and low temperature performance and storage stability. The results show that the rutting factor and failure temperature of composite modified asphalt are higher than that of base asphalt. When EVA content is higher than 4%， the high temperature index of the composite modified asphalt is higher than that of SBS modified asphalt. LDPE and EVA can greatly improve the high temperature performance of asphalt. The addition of two kinds of polymers has no obvious effect on the low temperature performance of asphalt. The addition of EVA can improve the storage stability of composite modified asphalt to a certain extent. Infrared spectrum test results show that there is no obvious chemical reaction between LDPE，EVA and asphalt. |
| Key words: composite modified asphalt high temperature rheological property low temperature rheological property storage stability |
