Study on the Low Temperature Performance and Micro Characteristic Mechanism of Warm Mix Asphalt
SONG Yunlian, GAO Pan, LYU Peng
Key Laboratory of Civil Engineering Structure and Mechanics, Inner Mongolia Autonomous Region, Inner Mongolia University of Technology, Hohhot 010051, China
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 IB, a and aliphatic functional group index IB 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 IB which characterizes the micro-molecular structure of bitumen was positively (negatively) related to the change tendency of its characterization of macro-low temperature properties.
宋云连, 高盼, 吕鹏. 温拌沥青低温性能及其微观特性机理研究[J]. 材料导报, 2021, 35(Z1): 251-257.
SONG Yunlian, GAO Pan, LYU Peng. Study on the Low Temperature Performance and Micro Characteristic Mechanism of Warm Mix Asphalt. Materials Reports, 2021, 35(Z1): 251-257.
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2021, Vol. 35 
