Abstract
To recycle reclaimed asphalt pavement (RAP) derived from porous asphalt (PA) surfacing into a new PA mix, a fundamental understanding of RAP binder properties is needed. In this paper, properties of two PA RAP binders, with and without rejuvenation, were evaluated using quantitative nanomechanical atomic force microscopy (QNM AFM) and performance grading (PG) testing. A model that describes the effect of a bio-rejuvenator on RAP microstructure was developed. A strong correlation was found between the properties measured at nanoscale and macroscale, indicating that the macro properties of RAP binders are driven by the level of polar associations and intermolecular interactions in the bitumen microstructure. This indicates that the microstructures observed in AFM are representative of the bulk properties. Addition of bio-rejuvenator in RAP resulted in the dispersion of polar associations. Finally, it was found that one percent of the rejuvenator can reduce PG critical temperatures by approximately 2 degrees.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
