Determination of percent working binder in recycled asphalt pavement materials

I. L. Al-Qadi, S. H. Carpenter, G. L. Roberts, H. Ozer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The amount of working binder available in RAP materials is unknown. A research plan was developed to determine the amount of working binder using complex modulus measurements of mixes containing stockpile RAP and the aggregate and binder recovered from the original RAP. The mixtures made from the recovered RAP materials were used as a basis of comparison to determine the amount of working binder. The testing was not able to determine an amount of working binder. However, when investigating the mix design method, it was found that the RAP mixes were behaving as if 100% of the binder was working. It was also determined that double bumping the asphalt grade softened the mix. Future use of RAP in mixes should not require special considerations in mix design, but the new binder should be modified to offset an increased stiffness produced with the use of RAP.

Original languageEnglish (US)
Title of host publicationEfficient Transportation and Pavement Systems
Subtitle of host publicationCharacterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads
PublisherCRC Press
Pages505-516
Number of pages12
ISBN (Print)9780415489799
DOIs
StatePublished - 2008
Externally publishedYes

Publication series

NameEfficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling - Proceedings of the 4th International Gulf Conference on Roads

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Transportation

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