Abstract
To determine the binder film thickness on the aggregate surface in high amounts of reclaimed asphalt mixture (RAP), this paper mixed RAP aggregate, new aggregate, and new binders, and conducted analysis by adopting electron microscope and photograph analysis techniques. Environmental scanning electron microscope (ESEM) and X-ray spectrometer analyses show that the RAP binder is not completely mixed with the new binder, but wrapped around the RAP aggregate, forming a layered structure. This structure consists of an inner layer of the RAP binder that is not mixed with new asphalt, called "black rock". The RAP binder film thickness is a function of mixing temperature, local aggregate curvature, and aggregate size. The higher mixing temperature leads to the thinner RAP binder layer. Statistical analysis of RAP binder film thickness at the microscale reveals that the binder film thickness depends on the local curvature of the aggregate, with thinner films at positive curvatures and thicker films at negative curvatures.
Publication Date
8-18-2022
DOI
10.14048/j.issn.1671-2579.2022.04.040
First Page
217
Last Page
221
Submission Date
May 2025
Recommended Citation
Jiayao, LIU; Peiwen, HAO; Xinyi, ZHOU; and Wentao, JIANG
(2022)
"Measuring Method for Binder Film Residues on Black Rock in Mixtures with High Amounts of Reclaimed Asphalt,"
Journal of China & Foreign Highway: Vol. 42:
Iss.
4, Article 40.
DOI: 10.14048/j.issn.1671-2579.2022.04.040
Available at:
https://zwgl1980.csust.edu.cn/journal/vol42/iss4/40