U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This report is an archived publication and may contain dated technical, contact, and link information|
|Publication Number: FHWA-HRT-98-142 Date: June 2001|
Publication Number: FHWA-HRT-98-142
Date: June 2001
PDF files can be viewed with the Acrobat® Reader®
Public Law 102-240, the Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991, directed the Federal Highway Administration in Section 6016 to enter into a 5-year contract research program with the Western Research Institute (WRI) of the University of Wyoming. The title of this research program is Fundamental Properties of Asphalts and Modified Asphalts, Contract No. DTFH61-92-C-00170. As part of this contract, Task K-Microdamage Healing in Asphalt and Asphalt Concrete was performed by the Texas Transportation Institute of Texas A&M University and North Carolina State University.
This report details the results of the Task K subcontract; the main body of the WRI report will be published subsequently. The results of Task K have advanced our understanding, both theoretically and in terms of measurement, of fatigue damage, especially fatigue cracking, in asphalt pavements. It explicitly and quantitatively considers the impact of healing, the regaining of pavement strength and integrity upon standing without traffic (resting), on fatigue life. This research is expected to form the basis of specification testing for fatigue susceptibility and the improvement of fatigue life of asphalt pavements.
T. Paul Teng, P.E. Director
Office of Infrastructure R & D
This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use. This report does not constitute a standard, specification, or regulation.
The United States Government does not endorse products or manufacturers. Trademarks or manufacturer's names appear herein only because they are considered essential to the object of this document.