Effect of different aqueous solutions on physicochemical properties of asphalt binder

Effect of different aqueous solutions on physicochemical properties of asphalt binder

Zou, Yingxue (Wuhan University of Technology)
Amirkhanian, Serji (University of South Alabama)
Xu, S. (TU Delft Materials and Environment)
Li, Yuanyuan (Wuhan University of Technology)
Wang, Yafei (Wuhan University of Technology)
Zhang, Jianwei (Wuhan University of Technology)

2021

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 (I_C=O) and sulfoxide index (I_S=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.

Aqueous solutions
Asphalt
Components
Morphology
Structure

http://resolver.tudelft.nl/uuid:4ef337e8-ca2d-4a50-b705-a69c78a77703

https://doi.org/10.1016/j.conbuildmat.2021.122810

0950-0618

Construction and Building Materials, 286, 1-12

Institutional Repository

journal article

© 2021 Yingxue Zou, Serji Amirkhanian, S. Xu, Yuanyuan Li, Yafei Wang, Jianwei Zhang