考虑老化影响的岩沥青复合改性沥青流变特性及微观机制

doi:10.11896/cldb.19080207

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Abstract In order to investigate the rheological properties and microscopic mechanism of rock asphalt composite modified asphalt considering the aging effect, the frequency scanning test and time scanning test using dynamic shear rheometer (DSR) were conducted to analyze the viscoelastic characteristics and fatigue properties of rock asphalt/SBS composite modified asphalt (R/SMA), rock asphalt/crumb rubber composite modified asphalt (R/CMA), rock asphalt modified asphalt (RAMA) and SBS modified asphalt (SBSMA). The microstructure, modification mechanism and aging mechanism of the modified asphalts were studied by fluorescence microscopy (FM) and Fourier transform infrared spectroscopy (FTIR). The results showed that R/CMA exhibited good shear deformation resistance at high temperatures. Thermal oxygen and pressure aging reduced the frequency sensitivity of the R/SMA sample with 5% rock asphalt and 2% SBS and the compatibility of its system were improved. The R/CMA with high rock asphalt content showed poor structural stability and system compatibility after aging. The composite modified asphalts in this study generally had better fatigue resistance after short-term aging, while the fatigue resistance of SBSMA and RAMA was significantly improved after the long-term aging. Under different aging conditions, the R/CMA added 5% rock asphalt and 18% crumb rubber modifier presented excellent fatigue performance. The fluorescence microscopy test results indicated that the surface of the R/SMA with 5% rock asphalt and 2% SBS was flat and smooth. Without destroy the three-dimensional continuous network structure of the SBS, the addition of 5% rock asphalt improved the stability of the spatial network structure, and thus improved the shear deformation resistance of the SBSMA. There are grooves and protrusions on the surface of the R/CMA, and the discrete spherical particles of rock asphalt and irregular linear or reticular rubber powder particles were dispersed in asphalt phase independently, in which the local network structure of the R/CMA with 5% rock asphalt and 18% crumb rubber was the most significant in the all modified asphalts. The FTIR test results indicated that R/SMA presented a physically modification that inhe-rited the characteristics of both SBSMA and RAMA. The R/CMA showed a physical-chemically modification that was dominated by physical modification and supplemented by chemical modification. Based on comprehensively analyzing the functional indexes and aging indexes, the crumb rubber modifier presented superior inhibition effect on the formation of carbonyl and sulfoxide compounds than the SBS modifier, which meant the R/CMA with 5% rock asphalt and 18% crumb rubber exhibited better anti-aging properties than the R/SMA with 5% rock asphalt and 2% SBS.

Key words： dynamic shear rheometer rock asphalt composited modified asphalt fatigue performance microscopic mechanism functional index

Published: 12 September 2020

CLC number:

U414

Fund:This work was financially supported by the National Natural Science Foundation of China (51308084) and the Fundamental Research Funds for the Central Universities (3132017029).

About author:: Lin Wangreceived her M.S. degree in engineering mechanic from Liaoning Technical University in Sep. 2014—Jan. 2017. She is currently a Ph.D. student of Dalian Maritime University under supervision of professor Naisheng Guo. Her research focus on asphalt and asphalt mixture.
Naisheng Guoreceived his Ph.D. degree from Dalian Maritime University in 2007. He worked as a postdoctoral researcher in Harbin Institute of Technology from 2009 to 2012. In 2013, he became a visiting scholar at Michigan Technological University, returned a year la-ter. He is currently a full professor in College of Transportation Engineering, Dalian Maritime University. His research focuses on bitumen and bituminous mixture. In recent years, more than 60 academic papers have been published in domestic and foreign academic journals, among which more than 30 have been retrieved by SCI and EI.
Zhanping Youreceived his Ph.D. degree in civil engineering from the University of Illinois at Urbana-Champaign in 2003. He is a Professor in Civil and Environmental Engineering at Michigan Technological University since 2008. He served as an associate and assistant professor at Michigan Technological University and as an assistant professor at Texas A&M University- Kingsville. He has held a Professional Engineering license since 2005. Dr. Zhanping You joined the School of Highway at Chang'an University as an chair professor of Yangtze scholar in 2010. He received honorable professorships from the Changjiang Scholar Program awarded by China Education Ministry in 2014. His area of research and teaching interests focus on microstructure and mechanics of asphalt mixture, performance characterization and testing method of asphalt material, perfor-mance optimization of asphalt mixture, design method of asphalt pavement, new type of environment-friendly asphalt. Professor You has published over 200 papers in journals (and conference proceedings) among which 88 were included by SCI and cited 3 300 times.

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Cite this article:

WANG Lin,GUO Naisheng,WEN Yankai, et al. Rheological Properties and Microscopic Mechanism of Rock Asphalt Composite Modified Asphalt with Consideration of Aging Effect[J]. Materials Reports, 2020, 34(18): 18065-18073.

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http://www.mater-rep.com/EN/10.11896/cldb.19080207 OR http://www.mater-rep.com/EN/Y2020/V34/I18/18065

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