Evaluation of Predictive Models for Determination of Binder Critical High Temperature from Mixture Properties

When reclaimed asphalt pavement (RAP) is used in an asphalt mixture, the aged binder from RAP is blended with virgin binder and affects the resultant blended binder grade. According to AASHTO M 323, at high RAP contents, a blending chart should be used to determine either how much RAP can be added or which virgin binder to use. To develop a blending chart, the critical temperatures of the recovered RAP binder need to be determined. Due to the concerns and challenges with the current extraction and recovery process for separating the RAP binder, a new approach of using predictive models to back-calculate the critical temperatures of the blended binder from mixture properties has been investigated. An evaluation was conducted to investigate the possibility of using the new approach for determination of the binder critical high temperature from the mixture volumetric properties and E* for use in the RAP mix design. The evaluation was conducted using mixtures with virgin binder and aggregate materials sampled during the construction of the NCAT Pavement Test Track in 2006. Compared to the measured critical high temperatures, the back-calculated critical high temperatures were different and ranged from 0.5 to 15.1oC, equivalent to approximately 2.5 times one performance grade (6oC). The difference was largely influenced by the G* back-calculation errors. To reduce the back-calculation errors, the Hirsch model used for back-calculating G* may need to be calibrated for local materials.

• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Tran, Nam
  • Taylor, Adam Joel
  • West, Randy C
  • Kvasnak, Andrea
  • Turner, Pamela
• Conference:
  • Transportation Research Board 89th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2010-1-10 to 2010-1-14
• Date: 2010

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 16p
• Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

• TRT Terms: Asphalt pavements; Bituminous aggregates; Bituminous binders; Bituminous materials; Blending; Hot mix asphalt; Mix design; Reclaimed asphalt pavements; Resource extraction; Road construction
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 01158078
• Record Type: Publication
• Report/Paper Numbers: 10-2332
• Files: TRIS, TRB
• Created Date: May 30 2010 7:44AM