Development and Implementation of the Illinois Flexibility Index Test: A Protocol to Evaluate the Cracking Resistance of Asphalt Mixtures

The Illinois Center for Transportation and Illinois Department of Transportation partnered in a series of research projects beginning in 2012 with a specific objective of identifying, developing, and evaluating protocols, procedures, and specifications for testing engineering properties of asphalt concrete (AC) mixtures with varying amounts of asphalt binder replacement (up to 60%) using reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS), as well as a number of other AC mixtures with various field performance and mixture volumetrics. One of the major outcomes of this study was the development of the Illinois Flexibility Index Test (I-FIT) method and protocol that can rank AC mixtures based on their cracking resistance. The I-FIT method is performed at 25°C (77°F). A 50 mm/min (2 in./min) loading rate is proposed for screening AC mixtures to control potential premature cracking. Ultimately, the introduced test method is coupled with an index parameter, the FI, to characterize the fracture potential of AC mixes. The FI is derived from the load-displacement response incorporating fracture energy and slope of the load-displacement curve after a crack begins to propagate.

• Record URL:
  • http:// http://www.trb.org/Main/Blurbs/178401.aspx
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00978515
• Authors:
  • Ozer, Hasan
  • Al-Qadi, Imad L
• Publication Date: 2018-10

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: pp 30-43
• Monograph Title: Innovations in Asphalt Mixture Design Procedures
• Serial:
  • Transportation Research Circular
  • Issue Number: E-C237
  • Publisher: Transportation Research Board
  • ISSN: 0097-8515

Subject/Index Terms

• TRT Terms: Asphalt concrete; Asphalt mixtures; Asphalt tests; Cracking of asphalt concrete pavements; Flexibility; Index tests; Test procedures
• Geographic Terms: Illinois
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01687979
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: Dec 11 2018 2:48PM