| 摘要: |
| 为了解决废旧塑料改性沥青储存稳定性和低温抗裂性差等问题，采用双螺杆挤出机对废旧聚乙烯（PE）进行预处理，并将其与生物油复合制得生物油/预处理废旧PE复合改性沥青.采用离析试验、流变性能试验、荧光显微镜试验和傅里叶变换红外光谱试验分析了改性沥青的储存稳定性、低温抗裂性和高温稳定性.结果表明：经预处理后的PE密度与沥青密度相近，极性基团和C=C结构更多，化学活性增强，大大提高了废旧PE改性沥青的储存稳定性；生物油/预处理废旧PE复合改性沥青形成了连续的网状结构，进一步提高了废旧PE改性沥青的储存稳定性，并显著提升了其低温抗裂性，但降低了其高温稳定性. |
| 关键词: 改性沥青 生物油 预处理废旧PE 储存稳定性 低温抗裂性 |
| DOI：10.3969/j.issn.1007-9629.2024.01.006 |
| 分类号:U414 |
| 基金项目:湖南省自然科学基金资助项目（2021JJ30709）；长沙市自然科学基金资助项目（kq2007029）；长沙理工大学科研创新资助项目（CX2021SS05） |
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| Bio-oil/Pre-treated Waste PE Composite Modified Asphalt |
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FENG Xinjun, FU Hao
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School of Traffic and Transportation Engineering， Changsha University of Science & Technology， Changsha 410114， China
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| Abstract: |
| To address the issues of poor storage stability and low-temperature crack resistance in waste plastic-modified asphalt， a twin-screw extruder was employed to pretreat waste polyethylene （PE） and subsequently it was combined with bio-oil to produce bio-oil/pretreated waste PE composite modified asphalt. Storage stability， low-temperature crack resistance， and high-temperature stability of modified asphalt were examined by separation test， rheological property test， fluorescence microscopy test， and Fourier-transform infrared spectroscopy test. The results show that the density of the pretreated waste PE is close to that of asphalt， and the presence of more polar groups and C=C structures increase its chemical activity， significantly enhancing the storage stability of waste PE modified asphalt. The bio-oil/pretreated waste PE composite modified asphalt forms a continuous network structure， which further improves the storage stability of waste PE modified asphalt and significantly increases its low-temperature crack resistance， while reduces its high-temperature stability. |
| Key words: modified asphalt bio-oil pre-treated waste PE storage stability low temperature crack resistance |
