Final Report FHWA/IN/JTRP-2004/10 Interaction between Micro-Cracking, Cracking, and Reduced Durability of Concrete: Developing Methods for Considering Cumulative Damage in Life-Cycle Modeling Zhifu Yang Graduate Research Assistant W. Jason Weiss Associate Professor of Civil Engineering and Jan Olek Professor of Civil Engineering Construction Materials Engineering School of Civil Engineering Purdue University Joint Transportation Research Program Project Number: C-36-37K File Number: 5-8-37 Indiana SPR-2474 Prepared in Cooperation with the Indiana Department of Transportation and the U.S. Department of Transportation Federal Highway Administration The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data present herein. The contents do not necessarily reflect the official views and policies of the Indiana Department of Transportation or the Federal Highway Administration at the time of Publication. The report does not constitute a standard, specification, or regulation. Purdue University West Lafayette, IN 47907 August 2005