盐冻循环条件下改性沥青微细观结构

doi:10.13229/j.cnki.jdxbgxb201702015

摘要/Abstract

摘要： 利用扫描电子显微镜(SEM)和原子力显微镜(AFM)研究了内蒙古地区道路工程常用沥青(基质沥青、SBS改性沥青和胶粉改性沥青)盐冻循环前、后的细观结构变化,分析了改性剂与沥青的相互作用机理。结果表明,SEM和AFM可以相互补充,能更好地反映沥青在不同状态下细观结构的变化。在冻融循环后,各种沥青发生不同程度的水老化,特别是盐冻循环后基质沥青与SBS改性沥青中出现盐晶粒,沥青膜破坏明显;而胶粉改性沥青中胶粉颗粒抑制盐晶粒的生长,且胶粉颗粒本身具有弹性,低温性能虽有下降,但多次冻融循环后仍能保持较好的形态。

关键词: 道路工程, 基质沥青, 改性沥青, 盐冻循环, 微观结构, 扫描电子显微镜, 原子力显微镜

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

中图分类号:

U214.7

崔亚楠, 韩吉伟, 冯蕾, 李嘉迪, 王乐. 盐冻循环条件下改性沥青微细观结构[J]. 吉林大学学报(工学版), 2017, 47(2): 452-458.

CUI Ya-nan, HAN Ji-wei, FENG Lei, LI Jia-di, WANG Le. Microstructure of asphalt under salt freezing cycles[J]. 吉林大学学报(工学版), 2017, 47(2): 452-458.

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