4.5 Article

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

Journal

INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
Volume 23, Issue 10, Pages 3553-3565

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/10298436.2021.1905809

Keywords

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

Funding

  1. National Natural Science Foundation of China [51808326]
  2. Natural Science Foundation of Shandong Province [ZR2020ME269]
  3. Key Technology Research and Development Program of Shandong [2019GHY112076]
  4. Faculty Start-up Grant of China University of Mining and Technology [102520282]

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This article investigated the potential usage of eggshell powder as a bio-modifier for asphalt binder and mixture, with effects on workability and mechanical properties studied. Results showed that eggshell powder made asphalt binder stiffer, increased moisture susceptibility, and reduced pumping ability, while also reducing workability but improving resistance to rutting and moisture damage properties of asphalt mixtures.
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.

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