Capturing Durability of High Recycled Binder Ratio (RBR) Asphalt Mixtures
Environmental sustainability and economic benefits motivate maximum use of recycled asphalt materials (RAM), including reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS), in asphalt mixtures. However, when stiff, brittle, aged materials are added to virgin asphalt-aggregate mixtures, adequate durability (initially and with time) must be maintained by engineering each unique combination of virgin and recycled materials. To maximize durability, state departments of transportation (DOTs) currently limit the RAP and RAS contents and their overall recycled binder ratio (RBR). Strategies for improving binder rheology and mixture durability include utilizing a softer base binder or adding a recycling agent (rejuvenator), but the durability of mixtures utilizing these strategies is unknown. The objectives of this research were: (1) produce a proposed AASHTO standard practice and associated test methods for design and evaluation of durable high RAM content asphalt mixtures and (2) revise the proposed AASHTO Standard Practice for Characterization of Asphalt Mixtures with High Recycled Materials Contents and Recycling Agents produced in NCHRP Project 09-58 to address mixture durability.
- Record URL:
-
Supplemental Notes:
- Research completed. Publication decision pending.
Language
- English
Project
- Status: Completed
- Funding: $750000
-
Contract Numbers:
Project 09-65
-
Sponsor Organizations:
National Cooperative Highway Research Program
Transportation Research Board
500 Fifth Street, NW
Washington, DC United States 20001American Association of State Highway and Transportation Officials (AASHTO)
444 North Capitol Street, NW
Washington, DC United States 20001Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Project Managers:
Barcena, Roberto
-
Performing Organizations:
Texas A&M Transportation Institute (TTI)
400 Harvey Mitchell Parkway South
Suite 300
College Station, TX United States 77845-4375 -
Principal Investigators:
Martin, Amy
- Start Date: 20210326
- Expected Completion Date: 20240630
- Actual Completion Date: 0
Subject/Index Terms
- TRT Terms: Aging (Materials); Asphalt mixtures; Binders; Cracking; Durability; Recycled materials
- Subject Areas: Highways; Materials; Pavements;
Filing Info
- Accession Number: 01739634
- Record Type: Research project
- Source Agency: Transportation Research Board
- Contract Numbers: Project 09-65
- Files: TRB, RIP
- Created Date: May 20 2020 9:23AM