Towards the potential usage of eggshell powder as bio-modifier for asphalt binder and mixture: workability and mechanical properties

ABSTRACT

This article investigates the potential usage of eggshell powder as a bio-modifier for asphalt binder and mixture with the consideration of workability and mechanical properties. The effects of varying dosages (3%, 6%, 9%, and 12%) of eggshell powder on workability, rutting, and moisture damage of asphalt binder and mixture were investigated. Viscosity, multiple stress creep recovery, and bitumen bond strength tests were performed on asphalt binders. Subsequently, Superpave gyratory densification indices (Locking point method), wheel tracking, and indirect tensile strength (Modified Lottman) tests were performed on asphalt mixtures. Results show that incorporation of eggshell powder makes asphalt binder stiffer, increases moisture susceptibility, and reduces pumping ability irrespective of dosage rate. Furthermore, the incorporation of eggshell powder reduces workability but increases resistance to rutting and moisture damage properties of asphalt mixtures irrespective of dosage rate.

KEYWORDS:

• Eggshell powder
• locking point method
• multiple stress creep recovery
• bitumen bond strength
• workability

Acknowledgements

This research was funded by the Faculty Start-up Grant of China University of Mining and Technology (Grant No. 102520282).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China [grant number 51808326]; Natural Science Foundation of Shandong Province [grant number ZR2020ME269]; Key Technology Research and Development Program of Shandong [grant number 2019GHY112076]; Faculty Start-up Grant of China University of Mining and Technology [grant number 102520282].