冷冻干燥法制备有机蒙脱土及其改性沥青性能研究

doi:10.11896/cldb.19010060

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Abstract 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.

Key words： asphalt organic montmorillonite freeze-drying rheological properties aging properties

Published: 15 January 2020

CLC number:

U414

About author:: Shuai Zhangobtained his B.E. degree in 2015 from Chongqing University of Science and Technology. He is currently a graduate student at the College of Automotive and Mechanical Engineering, Changsha University of Science and Technology. His work is focused on the research of functional materials and applications;Jian Zhangobtained his Ph.D. degree from Hunan University in 2009. After graduation, he joined Changsha University of Science and Technology. He is currently an associate professor in the College of Automotive and Mechanical Engineering, Changsha University of Science and Technology. His work is focused on the design and preparation of functional materials.

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Cite this article:

ZHANG Shuai,ZHANG Jian. Study on Preparation of Organic Montmorillonite by Freeze-drying Method and Its Modified Asphalt Performance[J]. Materials Reports, 2020, 34(4): 4037-4042.

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http://www.mater-rep.com/EN/10.11896/cldb.19010060 OR http://www.mater-rep.com/EN/Y2020/V34/I4/4037

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