预溶胀交联型SBS-D改性沥青流变性能与微观结构研究

孙俊锋; 蓝海明; 那鹏; 董坤; 周策; 孙傲; 邵建文

doi:10.70693/cjst.v2i5.2163

Authors

孙俊锋东北林业大学
蓝海明黑龙江省交通规划设计研究院集团有限公司
那鹏黑龙江省交通规划设计研究院集团有限公司
董坤黑龙江省交通规划设计研究院集团有限公司
周策黑龙江省交通规划设计研究院集团有限公司
孙傲东北林业大学
邵建文鲁东大学

DOI:

https://doi.org/10.70693/cjst.v2i5.2163

Keywords:

SBS-D；改性沥青；流变性能；多重应力蠕变恢复；红外光谱；原子力显微

Abstract

为明确预溶胀、增容与有限交联对SBS改性沥青宽温域流变响应及表面微观结构的影响，以90#基质沥青、常规SBS改性沥青、SBS/大豆油复合改性沥青和SBS-D改性沥青为对象，开展动态剪切流变、重复蠕变恢复、弯曲梁流变、傅里叶变换红外光谱及原子力显微试验。结果表明，SBS-D改性沥青的复数剪切模量与车辙因子温度敏感性较基质沥青分别降低14.0%和13.8%，较常规SBS改性沥青分别降低9.3%和9.1%；70 ℃、0.1 kPa条件下不可恢复蠕变柔量较常规SBS改性沥青降低30.2%，高应力下仍保持最低水平。SBS-D改性沥青在低温下表现出较低的蠕变劲度和较高的蠕变速率。红外光谱表明体系形成少量硫化交联结构，原子力显微二维形貌显示其蜂状结构增多、微区起伏增强。大豆油预溶胀促进SBS链段舒展，石油树脂改善相间接触，有限交联提高结构稳定性，使SBS-D改性沥青兼具较好的高温抗变形能力和低温应力松弛能力。

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