An implementation of the illinois flexibility index testing protocol for balanced asphalt mix designs

M. K. Barry, I. L. Al-Qadi, H. Ozer, F. Safi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Illinois Flexibility Index Test, or I-FIT, was developed specifically to analyze the flexibility and cracking potential of asphalt mixtures. The introduction of recycled materials, such as Reclaimed Asphalt Pavement (RAP) and Recycled Asphalt Shingles (RAS), has increased mixture brittleness to unacceptable levels, leading to increased cracking. The I-FIT method is ideal for identifying potentially brittle mixes and analyzing acceptable flexibility in recycled mixes. The results from mixes with varying levels of RAP and RAS content is presented in this paper. Materials with low recycled content often have Flexibility Index (FI) values above 10, while mixes with high recycled content and proven high cracking potential often haveFI values below 4. The I-FIT method combined with the Hamburg Wheel Tracking (HWT) test, which quantifies rutting potential, can ensure a balanced mix design, which will resist both rutting and cracking failure.

Original languageEnglish (US)
Title of host publicationBearing Capacity of Roads, Railways and Airfields - Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017
EditorsAndreas Loizos, Imad L. Al-Qadi, A. Tom Scarpas
PublisherCRC Press/Balkema
Pages217-221
Number of pages5
ISBN (Print)9781138295957
DOIs
StatePublished - 2017
Externally publishedYes
Event10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017 - Athens, Greece
Duration: Jun 28 2017Jun 30 2017

Publication series

NameBearing Capacity of Roads, Railways and Airfields - Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017

Conference

Conference10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017
CountryGreece
CityAthens
Period6/28/176/30/17

ASJC Scopus subject areas

  • Civil and Structural Engineering

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