Asphalt Re-recycling

Use of Reclaimed Asphalt Pavement (RAP) is beneficial to both road owners and builders as it allows for significant raw material cost reduction, while potentially maintaining expected pavement service life. In upcoming decades, the recycling of previously recycled pavements (i.e. re-recycling) will become widespread. There is currently little technical knowledge on how or how many times asphalt pavement can be recycled while sustaining its expected durability. A novel asphalt binder aging method involving thin layers, heat, water spray, and UV radiation was developed to simulate approximately 20 years of in-service aging. The aged binder was recovered and blended with a softer, virgin binder. The blend was subjected to the next aging cycle. The process was repeated four times to simulate four recycling cycles (80 years) at 25 percent RAP addition. Three virgin binders were tested: standard Performance Grade (PG), one grade softer PG, and standard PG softened with paraffinic oil to one PG softer binder. Very detailed chemical and rheological analyses were performed to understand the impact of multiple recycling on irreversible chemical changes and evolution of rheological properties over the time. Results indicated that at moderate recycling levels, re-recycling is a viable option if an appropriate virgin binder is used.

• Corporate Authors:

  Canadian Technical Asphalt Association

  ,   United States 
• Authors:
  • KRIZ, P
  • Tardiff, BJ
  • Sta. Maria, SR
  • Shirts, RD
• Conference:
  • Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia
• Publication Date: 2017

Language

• English

Media Info

• Media Type: Print
• Pagination: pp. 371-399.
• Monograph Title: Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia

Subject/Index Terms

• TRT Terms: Admixtures; Aging (Materials); Binders; Bituminous materials; Bituminous mixtures; Chemical analysis; Conferences; Properties of materials; Recycling; Rheology
• Geographic Terms: Canada
• ITRD Terms: 4736: Admixture; 5292: Ageing; 4948: Binder; 4955: Bituminous materials; 4967: Bituminous mixture; 8018: Canada; 7163: Chemical analysis; 8525: Conference; 5925: Properties; 4573: Recycling (mater); 5442: Rheology
• Subject Areas: Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01668516
• Record Type: Publication
• Source Agency: Transportation Association of Canada (TAC)
• Files: ITRD, TAC
• Created Date: May 3 2018 3:19PM