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Publication Number: FHWA-HRT-98-142
Date: June 2001
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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.
Topics: research, infrastructure, pavements and materials
Keywords: research, infrastructure, pavements and materials, asphalt concrete, microcracks, nicrodamage healing, binders
TRT Terms: research, facilities, transportation, highway facilities, roads, parts of roads, pavements