Effect of different aqueous solutions on physicochemical properties of asphalt binder

Yingxue Zou, Serji Amirkhanian, Shi Xu, Yuanyuan Li, Yafei Wang, Jianwei Zhang

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Aqueous solution is one of the main factors of asphalt pavement disease. However, the physicochemical changes of asphalt are ambiguous during immersion in different aqueous solutions. This study evaluated the physicochemical properties of asphalt under the action of different aqueous solutions to further understand the mechanism of moisture erosion. The morphology, chemical structure and four components of asphalt were observed after immersion, while the pH value, total organic carbon (TOC) and characteristic functional groups of residual solutions were monitored. The test results showed that aqueous solution could change the bee structure on the asphalt surface and increased the mean roughness. The carbonyl index (IC=O) and sulfoxide index (IS=O) of asphalt increased with immersion time. And the asphaltenes of asphalt fluctuated and eventually increased during immersion. Solute could accelerate the erosion on asphalt through interaction, the degree of which increased in the order, Na2SO4 saline < NaCl saline < pH 3 acid < pH 11 alkali.

Original languageEnglish
Article number122810
Pages (from-to)1-12
Number of pages12
JournalConstruction and Building Materials
Volume286
DOIs
Publication statusPublished - 2021

Keywords

  • Aqueous solutions
  • Asphalt
  • Components
  • Morphology
  • Structure

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