Investigation of Low- and High-Temperature Properties of Plant-Produced RAP Mixtures

Asphalt prices, supply issues, and growing interest in sustainable construction practices are leading to increased use of reclaimed asphalt pavement (RAP) in greater amounts and in more types of mixes. When using more than 15–20 percent RAP under most current specifications (State and national), contractors must change the virgin binder grade added to the mix. This frequently means using a less commonly available binder, which may be more expensive. This report provides analysis of the results of testing plant-produced hot mix asphalt (HMA) containing various levels of RAP and different grades of virgin binder. The study was undertaken initially to examine the effects of RAP on low-temperature properties of mixtures. In phase I of the study, mixes produced by one contractor in 2006 were tested. The results suggest that the addition of RAP stiffened the mix, but probably not to the extent expected based upon linear blending. There is evidence from other research that also suggests that there are cases when linear blending does not apply. Consequently, in phase II of the project, four more contractors replicated the experiment in their HMA plants. The objectives of the study were also expanded to include an evaluation of the extent of blending of the RAP and virgin binders in plant-produced mixtures.

• Record URL:
  http://www.fhwa.dot.gov/publications/research/infrastructure/pavements/11058/11058.pdf
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/41731
• Corporate Authors:

  Purdue University

  North Central Superpave Center, School of Civil Engineering
  1205 Montgomery Street, P.O. Box 2382
  West Lafayette, IN  United States  47906

  Federal Highway Administration

  Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
  McLean, VA  United States  22101
• Authors:
  • McDaniel, Rebecca S
  • Shah, Ayesha
  • Huber, Gerald
• Publication Date: 2012-1

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; References; Tables;
• Pagination: 107p

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Hot mix asphalt; Materials at high or low temperatures; Plant mix; Properties of materials; Reclaimed asphalt pavements
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01366192
• Record Type: Publication
• Report/Paper Numbers: FHWA-HRT-11-058
• Contract Numbers: DTFH61-08-P-00165
• Files: NTL, TRIS, USDOT
• Created Date: Mar 28 2012 3:59PM