Table of Contents
ISRN Civil Engineering
Volume 2013, Article ID 972020, 7 pages
Research Article

Flexible Pavement Performance in relation to In Situ Mechanistic and Volumetric Properties Using LTPP Data

Department of Civil Engineering, University of Louisiana at Lafayette, 254J Madison Hall, Lafayette, LA 70504, USA

Received 13 November 2012; Accepted 8 January 2013

Academic Editors: S. Easa, I. G. Raftoyiannis, and I. Smith

Copyright © 2013 Mohammad Jamal Khattak and Nagaraju Peddapati. 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.


This research study focuses on the actual performance of the flexible pavements and its relationship with the in-situ mechanistic and volumetric properties. The data required for the study were obtained using the Long Term Pavement Performance database. Approximately, 116 flexible pavement sections throughout United States were analyzed and discussed. The results indicated that the temperature has a significant affect on the backcalculated modulus of the hot mix asphalt layer. However, no strong relationship was observed between the hot mix asphalt backcalculated modulus and in situ air voids. It was found that fatigue life was a function of tensile strain at the bottom of hot mix asphalt layer, peak surface deflection, hot mix asphalt air voids and maximum specific gravity, and ambient air temperature. Similar relationships between the rut life, mechanistic and volumetric properties were established for wet-freeze and wet-no-freeze climatic zones. The sensitivity analysis revealed that the rut performance in wet-no-freeze sections is mainly affected by higher base and roadbed compressive stresses and strains. On the other hand, the performances in wet-freeze sections are highly depended on roadbed compressive strain and modulus ratio of subbase to roadbed.