Aging effects on microstructures and micromechanical properties of vulcanized eucommia ulmoides gum modified bitumen

•Aging effects on microstructures and micromechanics of bitumen are studied by AFM;•The incorporation of VEUG improves aging resistance and thermal stability of bitumen;•The VEUG addition and thermo-oxidative aging increase bituminous Young's modulus;•The VEUG and thermal aging decrease bitumin...

Full description

Saved in:
Bibliographic Details
Published inConstruction & building materials Vol. 346; p. 128432
Main Authors Wang, Haisen, Li, Ning, Xu, Tao
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 05.09.2022
Subjects
Atomic force microscopy
Bituminous microstructure
Micromechanical properties
Roughness indexes
Thermo-oxidative aging
Vulcanized eucommia ulmoides gum
Atomic force microscopy
Roughness indexes
Micromechanical properties
Thermo-oxidative aging
Bituminous microstructure
Vulcanized eucommia ulmoides gum
Online AccessGet full text

Cover

More Information
Summary:•Aging effects on microstructures and micromechanics of bitumen are studied by AFM;•The incorporation of VEUG improves aging resistance and thermal stability of bitumen;•The VEUG addition and thermo-oxidative aging increase bituminous Young's modulus;•The VEUG and thermal aging decrease bituminous adhesive force and energy dissipation.•A microcosmic view to reveal modification mechanism of VEUG on bitumen is provided. To reveal influence of thermo-oxidative aging on the microstructures and micromechanical performance of vulcanized eucommia ulmoides gum (VEUG) modified bitumen, atomic force microscope (AFM) tests were performed on virgin bitumen and VEUG modified bitumen before and after aging. Results indicate that the number and volume of “bee structures” in VEUG modified bitumen are reduced after the incorporation of VEUG. Also, the microstructures of VEUG modified bitumen are not obviously changed after aging as compared with those of virgin bitumen. All roughness indexes and their increments of VEUG modified bitumen are less than those of virgin bitumen before and after aging. Both VEUG incorporation and bituminous thermo-oxidative aging reduce the adhesive force and energy dissipation, but increase the Young's modulus of VEUG modified bitumen, and these changing amplitudes are less than those of virgin bitumen. The VEUG incorporation improves the aging resistance of bitumen. This study provides a perspective to reveal the modification mechanism of VEUG on bitumen from the perspectives of microstructures and micromechanical properties.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2022.128432