01687979

Component

http:// http://www.trb.org/Main/Blurbs/178401.aspx

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.

01685369

English

pp 30-43

2018-10

Transportation Research Circular

Digital/other

Figures; Photos; References; Tables

Asphalt concrete; Asphalt mixtures; Asphalt tests; Cracking of asphalt concrete pavements; Flexibility; Index tests; Test procedures

Illinois

Highways; Materials; Pavements

TRIS, TRB, ATRI

Nov 15 2018 11:28AM

• Application of Performance Tests During Asphalt Mixture Design: Louisiana’s Approach
• Balanced RAP–RAS–Recycling Agent Mix Design for Project-Specific Conditions
• Evaluating Balanced Mixture Design for New Jersey to Enhance Asphalt Mixture Durability
• Mixture Design for Better Field Compaction
• Optimized Mix Design Approach: Contractor’s Perspective