Recycled Asphalt Shingles (RAS) as a Full-Depth Reclamation (FDR) Mechanical Stabilizer

The use of recycled asphalt shingles (RAS) in transportation infrastructure has been extensively studied throughout the United States and elsewhere, for example, a recent National Cooperative Highway Research Project (NCHRP) synthesis study conducted by proposed project PI and co-PI found that 26 of 47 state transportation agencies in the United States allow use of RAS in hot- and warm-mixed asphalt concrete. An impediment in the use wide-spread use of RAS in asphalt concrete has been the increased premature cracking potential of such mixtures due to the aged and brittle nature of asphalt binder in RAS. This has resulted in restrictions on RAS usage in hot- and warm-mixed asphalts by many agencies, for example, the New Hampshire Department of Transportation does not presently allow use of RAS in asphalt mixtures. The Vermont state law (10 V.S.A. § 6605m) requires that asphalt shingles, predominantly generated as “Architectural Waste”, be recycled. Due to concerns associated with their usage in asphalt concrete layers of pavement structures, their use within lower pavement layers needs to be explored. The proposed study is urgently needed to understand the feasibility of using RAS as a stabilizing agent in FDR and to move towards conducting field trials on RAS stabilized FDR. Considering the existing Vermont law on recycling of shingles, this is the first step in its wide-spread use in highway pavements. Without this study it will be challenging to determine whether use of RAS in FDR is feasible and recommended.

Language

• English

Project

• Status: Active
• Funding: $116564
• Contract Numbers:

  VTRC023 603

• Sponsor Organizations:

  Vermont Agency of Transportation

  219 North Main Street
  Barre, VT  United States  05641
• Start Date: 20231001
• Expected Completion Date: 20250630
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Asphalt additives; Full-depth reclamation; Recycled materials; Shingles
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01933028
• Record Type: Research project
• Source Agency: Vermont Agency of Transportation
• Contract Numbers: VTRC023 603
• Files: RIP, STATEDOT
• Created Date: Oct 9 2024 1:18PM