温拌沥青低温性能及其微观特性机理研究

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Abstract In order to explore the relationship between the low-temperature performance and micro characteristics of asphalt, the ductility experiment, bending beam rheological experiment, micro experiment and infrared spectrum experiment were carried out for the base asphalt mixed with Evo and USP warm mix agent respectively. Bases on low temperature experiment data, from the aspect of performance and economy, the low temperature performance of asphalt was the best when the content of Evo and USP was 0.6% and 8% respectively. Two-factor analysis of va-riance shows that aging had a significant effect on ductility. The rheological test of bending beam shows that aging made the low temperature performance of asphalt worse. Through data fitting, it can be seen that the stiffness modulus S and creep rate m were in line relation with time h, and the fitting coefficient can be improved with the addition of warm mixing agent.It can be seen from the microscopic test that the micro morphology and three-dimensional diagram of different asphalt were quite different, and the shape and quantity of bee like structure have also changed after aging. The main reason is that the addition of warm mix agent changed the dispersion degree of asphalt molecules, and aging changed the asphalt components. Infrared spectrum test also shows that the low-temperature performance of aliphatic branched chain index I_{B, a} and aliphatic functional group index I_B decrease, and the index of long-chain alkanes increases, which indicates that aging leads to the migration of light components of asphalt to heavy components.However, macroscopically, the ductility decreased, the stiffness modulus S increased, the creep rate m became worse, and the fitting linear relationship was strengthened. In the correlation analysis, the absolute value of correlation coefficient was above 0.87, and the change rule of aliphatic functional group index I_B which characterizes the micro-molecular structure of bitumen was positively (negatively) related to the change tendency of its characterization of macro-low temperature properties.

Key words： warm mix asphalt aging effect low temperature performance micro property

Published: 16 July 2021

CLC number:

U414

Fund:Inner Mongolia Natural Science Foundation(2019MS05060),Scientific Research Projects of Universities in Inner Mongolia Autonomous Region(NJZZ20064).

About author:: Yunlian Song received her B.E. degree in Traffic and Civil Engineering from Inner Mongolia University of Technology (IUTM) in Sep.1991—July 1995; received her M.S. degree and Ph.D. degree in Solid Mechanics from Harbin Engineering University in Sep.1995—Jul. 2000. She was appointed to the faculty upon graduation, and is currently a professor of the IMUT. She was selec-ted for “321 talent project in the new century of Inner Mongolia” from 2012—2017. She took the post-doctoral research in SVBL (Satellite Venture Business Laboratory) of Mie University in Japan during Apr. 2003 — Apr. 2004. She has published more than 50 journal papers as the first author. Her research interests focus on the highway engineering structure with national research priority, and the fundamental theory & application about road new material, new structure and road structural reliability. She presides or takes part in the project of the Natural Science Foundation of China, Scientific Research Staring Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China, Inner Mongolia natural science foundation and others.Pan Gao received his bachelor's degrees in June 2018 from Yantai University in engineering. From September 2017 to today, he has studied in Inner Mongolia University of technology, focusing on the research of road materials.

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Cite this article:

SONG Yunlian,GAO Pan,LYU Peng. Study on the Low Temperature Performance and Micro Characteristic Mechanism of Warm Mix Asphalt[J]. Materials Reports, 2021, 35(Z1): 251-257.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/IZ1/251

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