石墨烯/聚乙烯复合改性沥青胶结料的流变性能研究

摘要/Abstract

摘要： 为提高沥青胶结料的综合路用性能,尤其是高温性能,本文采用高速剪切机将质优价廉的聚乙烯(PE)与石墨烯纳米片(GNPs)复合制备新型沥青胶结料,同时使用温度扫描(TeS)、多重应力蠕变恢复(MSCR)、线性振幅扫描(LAS)和傅里叶变换红外光谱(FTIR)研究了石墨烯/聚乙烯复合改性沥青胶结料的流变性能和作用机理。结果表明:GNPs和PE能够协同改善沥青胶结料的高温性能,提高路面的高温车辙抗性;预混的PE/GNPs母粒具有良好的中温疲劳和低温开裂抗性。同时复合改性沥青的FTIR光谱中未出现新的吸收峰,表明石墨烯和聚乙烯在沥青基体中以物理改性为主。

关键词: 石墨烯纳米片, 聚乙烯, 沥青胶结料, 流变性能, 复合改性

Abstract: To improve the overall road performance of asphalt binders, especially the high temperature performance, a new asphalt binder was prepared by combining high-quality and inexpensive polyethylene (PE) with graphene nanoplatelets (GNPs) with a high-speed shear mixer. Meanwhile, the rheological properties and action mechanism of the composite modified asphalt binders were subsequently investigated using temperature sweep (TeS), multiple stress creep recovery (MSCR), linear amplitude sweep (LAS), bending beam rheometer (BBR), and fourier transform infrared spectroscopy (FTIR). The results show that GNPs and PE synergistically improve the high-temperature performance of asphalt binders and enhance the high-temperature rutting resistance of pavements; the pre-blended PE/GNPs masterbatch has good medium-temperature fatigue and low-temperature cracking resistance. Meanwhile, no new absorption peaks appeared in the FTIR spectra of the composite modified asphalt, indicating that mainly physical co-blending of graphene and polyethylene occurred in the asphalt matrix.

Key words: graphene nanoplatelet, polyethylene, asphalt binder, rheological property, composite modification

中图分类号:

U414

李宝玉. 石墨烯/聚乙烯复合改性沥青胶结料的流变性能研究[J]. 硅酸盐通报, 2021, 40(7): 2461-2468.

LI Baoyu. Rheological Properties of Graphene/Polyethylene Composite Modified Asphalt Binder[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2461-2468.

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