Performance Characteristics of Modern Recycled Asphalt Mixes in Missouri, Including Ground Tire Rubber, Recycled Roofing Shingles, and Rejuvenators

A comprehensive laboratory and field investigation was carried out to evaluate the performance of recycled asphalt mixtures in Missouri by researchers at the University of Missouri-Columbia, in collaboration with the Missouri Department of Transportation and the Midwest Transportation Center. Eighteen field sections were evaluated, including a number of sections from the recent Long-Term Pavement Performance (LTPP), Special Pavement Sections (SPS-10) project in Osage Beach, Missouri, which was constructed in 2016. Binder testing and mix performance tests were carried out on field cores and laboratory compacted specimens. Based on the findings of the study, the following conclusions were drawn: (1) Missouri’s practices for the responsible and effective use of recycled materials is sound and continues to improve over time. Recent mix designs demonstrate more appropriate balancing between recycled material levels and virgin binder selection, resulting in better performance tests results when compared to older recycled mix designs. (2) Opportunities exist for further improving recycled mix design methods and recycling optimization in Missouri, including (a) moving to higher asphalt binder replacement (ABR) levels, by implementing mixture performance tests (balanced mix design); (b) increasing the use of recycled ground tire rubber (GTR) in Missouri mixes, by using balanced mix design to certify mixes using new, more economical GTR recycling methods, and; (c) researching the use of recycled materials in stone-mastic asphalt (SMA) designs. It is recommended to further evaluate and fine-tune mix performance tests for use in balanced mix design, which is particularly important for modern, heterogeneous recycled mixes.

• Record URL:
  https://intrans.iastate.edu/research/completed/performance-characteristics-of-modern-recycled-asphalt-mixes-in-missouri-including-ground-tire-rubber-recycled-roofing-shingles-and-rejuvenators/
• Record URL:
  https://mtc.intrans.iastate.edu/research/completed/performance-characteristics-of-modern-recycled-asphalt-mixes-in-missouri-including-ground-tire-rubber-recycled-roofing-shingles-and-rejuvenators/
• Record URL:
  https://intrans.iastate.edu/app/uploads/2019/03/recycled_asphalt_mixes_in_MO_w_cvr.pdf
• 

Language

• English

Project

• Status: Completed
• Funding: $470000
• Contract Numbers:

  DTRT13-G-UTC37

• Sponsor Organizations:

  Midwest Transportation Center

  Iowa State University
  2711 S Loop Drive, Suite 4700
  Ames, IA  United States  50010-8664

  Missouri Department of Transportation

  1617 Missouri Boulevard
  P.O. Box 270
  Jefferson City, MO  United States  65102
• Managing Organizations:

  Midwest Transportation Center

  Iowa State University
  2711 S Loop Drive, Suite 4700
  Ames, IA  United States  50010-8664

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590

  Missouri Department of Transportation

  1617 Missouri Boulevard
  P.O. Box 270
  Jefferson City, MO  United States  65102
• Performing Organizations:

  Iowa State University, Ames

  Institute for Transportation
  2711 South Loop Drive, Suite 4700
  Ames, Iowa  United States  50010-8664
• Principal Investigators:

  Buttlar, William

  Meister, James

• Start Date: 20160601
• Expected Completion Date: 20190322
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Bituminous binders; Crumb rubber; Field studies; Laboratory studies; Materials tests; Mix design; Pavement performance; Reclaimed asphalt pavements; Recycled materials; Shingles
• Geographic Terms: Missouri
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01699607
• Record Type: Research project
• Source Agency: Midwest Transportation Center
• Contract Numbers: DTRT13-G-UTC37
• Files: UTC, RIP
• Created Date: Mar 23 2019 12:51PM