吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (2): 452-458.doi: 10.13229/j.cnki.jdxbgxb201702015

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Microstructure of asphalt under salt freezing cycles

CUI Ya-nan1, HAN Ji-wei1, FENG Lei1, LI Jia-di1, WANG Le2   

  1. 1.College of Civil Engineering, Inner Mongolia University of Technology, Huhhot 010051,China;
    2.Highway Bureau of Inner Mongolia, Huhhot 010051,China
  • Received:2015-12-10 Online:2017-03-20 Published:2017-03-20

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Abstract: The microstructures of three kinds of asphalts (matrix asphalt, Styrene-butadiene-styrene (SBS) modified asphalt and rubber powder modified asphalt) before and after freezing throwing cycles were studied using Scanning Electron Microscope (SEM) and Atomic Force Microscope (AFM). The interaction mechanism of the modified agent and the asphalt was analyzed. Results show that the combination of SEM and AFM is more accurate in observing the change of the microstructure of asphalt in complex environment. The structures of different kinds of asphalt can be destroyed under the coupling effect of deicing salt and freezing-throwing. However, the rubber powder modified asphalt can still maintain a better state after repeated freezing-thawing cycles, indicating good low temperature adaptability.

Key words: road engineering, matrix asphalt, modified asphalt, salt freezing cycle, microstructure, scanning electron microscope, atomic force microscope

CLC Number: 

  • U214.7
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