Binder Availability in Recycled Materials: Review of Literature and Available Quantification Methods
Increasing recycled material content in asphalt mixtures provides economic and environmental benefits, but each unique material combination of virgin and recycled materials and additives must be engineered to ensure adequate performance with proper selection of component materials and balanced proportioning, as well as consideration of recycled binder availability. The design of mixtures with recycled materials often assumes that 100 percent of the recycled binder is available to blend with the virgin binder, and the virgin binder content is reduced accordingly. In reality, when recycled binder availability is less than 100 percent for heavily aged materials, total binder contents are less than optimum from mix design, resulting in dry mixtures with insufficient coating and inadequate durability and cracking performance. In addition, recycled binder availability can be used to assess aging state and preclude the use of large quantities of these materials with stiff, brittle binders that contribute negatively to performance even if available. This synthesis project addressed these issues by reviewing the literature available on the topic of recycled binder availability, collecting information on the state of the practice regarding recycled binder availability, performing a detailed analysis on three different recycled binder availability quantification methods, and revising the Texas Department of Transportation balanced mix design spreadsheet for Superpave mixtures to incorporate recycled binder availability.
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Corporate Authors:
Texas A&M Transportation Institute
Texas A&M University System
3135 TAMU
College Station, TX United States 77843-3135Texas Department of Transportation
Research and Technology Implementation Office
125 E 11th Street
Austin, TX United States 78701-2483Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Martin, Amy Epps
- Mercado, Edith Arámbula
- Abdelaziz, Amal
- Publication Date: 2021-10
Language
- English
Media Info
- Media Type: Digital/other
- Edition: Technical Report
- Features: Appendices; Figures; Photos; References; Tables;
- Pagination: 72p
Subject/Index Terms
- TRT Terms: Binder content; Mix design; Recycled materials; Superpave
- Identifier Terms: Texas Department of Transportation
- Subject Areas: Highways; Materials; Pavements;
Filing Info
- Accession Number: 01789197
- Record Type: Publication
- Report/Paper Numbers: FHWA/TX-21/0-7062-R1B, 0-7062-R1B
- Contract Numbers: Project 0-7062
- Files: NTL, TRIS, ATRI, USDOT, STATEDOT
- Created Date: Nov 22 2021 11:31AM