Affiliation:
1. Lyles School of Civil Engineering, Purdue University, West Lafayette, IN
2. Indiana Department of Transportation, Division of Research and Development, West Lafayette, IN
Abstract
Asphalt mixture cracking has become the dominant type of asphalt pavement distress in Indiana. In recent years, efforts have shifted away from the standard Superpave mixture design method in search of methods to improve the resistance of asphalt pavements to cracking-related distress. This paper presents a review of the applicability of the Illinois Flexibility Index Test (I-FIT) to evaluate the cracking potential of Indiana asphalt mixtures. In this study, two cracking indices were compared: the flexibility index (FI) and the cracking resistance index (CRI), both derived from the load-displacement curve. The applicability of quality assurance (QA) tests of laboratory-compacted and field-compacted samples was also explored to evaluate the cracking potential, and I-FIT was investigated for its applicability as a performance-related quality control (QC)/QA test. The results show that the FI values obtained from field-compacted samples were consistently higher than those of the lab-compacted samples. Both the FI and CRI values were significantly affected by variations in specimen thickness and air void content, with higher FI values observed with an increase in the air void content and a decrease in specimen thickness. The CRI values were less sensitive to I-FIT variability and more repeatable compared to the FI values. Finally, as an illustrative example, the cumulative distribution function of the FI values for a population of asphalt concrete (AC) mixtures was used to establish the different ranges for the quality thresholds of the materials.
Subject
Mechanical Engineering,Civil and Structural Engineering
Reference11 articles.
1. Fracture Characterization of Asphalt Mixtures with High Recycled Content Using Illinois Semicircular Bending Test Method and Flexibility Index
2. Development of an index to evaluate the cracking potential of asphalt mixtures using the semi-circular bending test
3. Rivera-Perez J. J. Effect of Specimen Geometry and Test Configuration on the Fracture Process Zone for Asphalt Materials. Master thesis. University of Illinois at Urbana-Champaign, 2017.
4. Barry M. K. An Analysis of Impact Factors on the Illinois Flexibility Index Test. Master thesis. University of Illinois at Urbana-Champaign, 2016.
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