Study on Preparation of Organic Montmorillonite by Freeze-drying Method and Its Modified Asphalt Performance

被引：0
作者：
Zhang S. [1 ]
Zhang J. [1 ]
机构：
[1] School of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha
来源：
Cailiao Daobao/Materials Reports | 2020年 / 34卷 / 02期
基金：
湖南省自然科学基金;
关键词：
Aging properties; Asphalt; Freeze-drying; Organic montmorillonite; Rheological properties;
D O I：
10.11896/cldb.19010060
中图分类号：
学科分类号：
摘要：
In this paper, organic montmorillonite (OMMT) was prepared by freeze-drying method. The effects of freeze-drying on the spacing and surface morphology of OMMT layer were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The modified asphalt was prepared by OMMT, and its influence on the physical and high-temperature rheological properties and anti-aging properties of the modified asphalt was studied. The results showed that freeze-drying could further increase the interlayer spacing of OMMT and refine the OMMT particle size. The introduction of OMMT increased the softening point and rutting factor of the modified asphalt, and significantly improved the high temperature performance of the modified asphalt. Film aging (TFOT) and pressure vessel aging (PAV) were performed to simulate short-term (ST) and long-term (LT) aging of asphalt, respectively. Compared with the original asphalt, the rutting factor and softening point of OMMT modified asphalt after TFOT changed little, the creep stiffness and fatigue factor after PAV were lower, and the aging index of modified asphalt was significantly lower than that of original asphalt. The introduction of OMMT enhances the high temperature performance of the modified asphalt and effectively inhibits the thermal oxygen aging of the modified asphalt, when the OMMT content is 3wt% the modified asphalt exhibits the best performance. © 2020, Materials Review Magazine. All right reserved.
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页码：04037 / 04042
页数：5
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