Table of Contents
ISRN Civil Engineering
Volume 2013 (2013), Article ID 901652, 10 pages
http://dx.doi.org/10.1155/2013/901652
Research Article

Analysis of Fatigue and Fracture of Hot Mix Asphalt Mixtures

1Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504-2291, USA
2Pavement Research Center of Excellence, Department of Civil and Environmental Engineering, Michigan State University, 3546 Engineering Building, East Lansing, MI 48824, USA

Received 12 November 2012; Accepted 19 December 2012

Academic Editors: M. Garg, H.-L. Luo, B. Uy, and J. Zheng

Copyright © 2013 Mohammad Jamal Khattak and Gilbert Y. Baladi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An accurate assessment of the fatigue life of hot mix asphalt (HMA) mixtures depends on the criteria used in the fatigue analysis. In the past, various studies have been conducted on crack initiation and crack propagation of the HMA mixtures. Most of these studies were focused on the beam samples with or without a sawed crack at the bottom. This paper presents and discusses two different fatigue life criteria for two-dimensional problems represented by cylindrical samples. One criterion is based on the rate of accumulation of the tensile horizontal plastic deformation (HPD) as a function of the number of load repetitions. The second criterion is based on fracture mechanics, stress intensity factor, and the rate of crack growth with respect to the number of load repetitions. It was found that, because of three-dimensional nature of the crack growth in cylindrical samples, the Paris' law was violated. It is shown that the rate of crack growth criterion provides higher values of fatigue life relative to the rate of accumulation of HPD criterion. Although a trend could be established among the fatigue lives obtained by using the two criteria, it was found that the fatigue lives obtained from the rate of accumulation of HPD were consistent and based on the actual measurement of HPD for HMA mixtures.