Predict high and low temperature true grade of reclaimed asphalt pavement binder using the enhanced mortar testing approach

Abstract

Accurate characterisation of reclaimed asphalt pavement (RAP) binder is an important prerequisite to successfully use RAP in new pavements. The conventional characterisation method is performed on the extracted and recovered RAP binders using harmful chemical solvents. A previous study proposed an enhanced mortar testing method that eliminates the use of chemical solvent by establishing a relationship between binder and mortar properties. As a follow-up, the objective of this study was to examine whether the enhanced mortar method is applicable at both high and low temperatures. The enhanced mortar method was evaluated using six RAP sources with distinct binder characteristics by comparing high and low temperature true grades measured from recovered RAP binders. Satisfactory results substantiate that the mortar methods can be used as an alternative to the solvent method, which lays a solid foundation for pursuing environmental and economic benefits associated with proper RAP usage.

KEYWORDS:

• Reclaimed asphalt pavement (RAP)
• RAP binder true grade
• mortar test
• RAP binder characterisation
• asphalt pavement

Acknowledgements

The authors thank Howard Moseley, Cassady Allen, Wayne Rilko and Michael Ciccarone from the Florida State Materials Office for the contribution throughout the course of this work.

Disclosure statement

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

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [51808403] and the Florida Department of Transportation [BDU-77].