Abstract
ABSTRACT A virgin mix and a recycled mix (containing 50% RAP) were manufactured so as to have identical aggregate grading and binder content. The viscosity of the binder in the recycled mix was also identical to that in the recycled mix, assuming complete intermixing of the hardened RAP binder with the added fresh binder. The mechanical properties of the two mixes were compared and it was found that the recycled mix had a lower modulus, a higher wheel tracking rate and a lower fatigue life than the virgin mix. This indicated that the two binders in the recycled mix had not been completely mixed and reasons for this are proposed. RAP often contains aggregate/binder or filler/binder agglomerations which it is difficult for the fresh bitumen or rejuvenating agent to penetrate. Some of the fresh bitumen in the recycled asphalt then forms a “shell” round the aged binder-coated aggregate particles or the binder aggregate agglomerations which came from the RAP. There are thus regions of low viscosity (fresh binder) in the recycled mix and this influences its mechanical properties.
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.
