The authors also would like to thank Snyder and Associates, including Dale Harrington, Melisse Leopold, and Jerod Gross the National Concrete Pavement Technology Center (CP Tech Center) staff at Iowa State University (ISU), including Tom Cackler, Gordon L. The project’s Technical Advisory Committee (TAC) members Chris Brakke, Eric Cowles, Todd Hanson, Kevin Jones, Michael Kennerly, Kevin Merryman, and Scott Schram from Iowa DOT are gratefully acknowledged for their guidance. The authors would like to thank the Iowa Department of Transportation (DOT) for sponsoring this research. Fick, Guide to Concrete Overlays: Sustainable Solutions for Resurfacing and Rehabilitating Existing Pavements (3rd edition), National Concrete Pavement Technology Center, Institute for Transportation, Iowa State University, Ames, Iowa, 2014. Gopalakrishnan, Evaluation of the Mechanistic-Empirical Pavement Design Guide for Implementation in Iowa, Balt. Gopalakrishnan, Design of Rigid Pavements in Iowa Using the Mechanistic-Empirical Pavement Design Guide, Balt. Harrington, Implementing the Mechanistic-Empirical Pavement Design Guide: Implementation Plan, Institute for Transportation, Iowa State University, Ames, Iowa, 2005. Ribbiso, Acceptable International Roughness Index Thresholds based on Present Serviceability Rating, J. Gopalakrishnan, Investigation of AASHTOWare Pavement ME Design / Darwin mE Performance Prediction Models for Iowa Pavement Analysis and Design, Institute for Transportation, Iowa State University, Ames, Iowa, 2015. Gopalakrishnan, Calibration of Pavement ME Design and Mechanistic-Empirical Pavement Design Guide Performance Prediction Models for Iowa Pavement Systems, J. Ma, Iowa Calibration of MEPDG Performance Prediction Models, Institute for Transportation, Iowa State University, Ames, Iowa, 2013. Gotlif, M Darter, Implementation of the thin bonded concrete overlay of existing asphalt pavement design procedure in the AASHTOWare Pavement ME design software, Transportation Research Record: Journal of the Transportation Research Board, 2641 (2017) 12–20. M Bonded Concrete Overlay of Asphalt Pavements Mechanistic-Empirical Design Guide (BOCA mE): Theory Manual, University of Pittsburgh, Pittsburgh, Pennsylvania, 2016.ī. Kaya, Concrete Overlay Performance on Iowa’s Roadways, National Concrete Pavement Technology Center, Institute for Transportation, Iowa State University, Ames, Iowa, 2017. Harrington, Guide to the Design of Concrete Overlays Using Existing Methodologies, National Concrete Pavement Technology Center, Institute for Transportation, Iowa State University, Ames, Iowa, 2012. Comparison of the historical performance-related data with Pavement ME Design software results indicates that the Pavement ME Design software is conservative in predicting concrete overlay service life. The theoretical insights provided by Pavement ME Design were compared with historical performance data and used to provide recommendations with respect to optimized joint spacing in overlay pavement structures. Even though concrete overlay technology is not a new concept, most of its design procedures still follow empirical methods, therefore this study applied AASHTOWare Pavement ME Design (Version 2.3.1) software to identify the effects of design para ms on concrete overlay service life. A review of PCI data indicates that improving construction quality to eliminate premature failure has the potential to add at least 10 years to the service life of PCC overlays. The data demonstrate that durability and service life can be improved. Based on these data concrete overlay service life has been modeled for various joint spacings. A database has been developed in Iowa that records the historical performance of overlays based on records of International Roughness Index (IRI) and Pavement Condition Index (PCI) over a 20-year period. Concrete overlays provide cost-effective maintenance and rehabilitation strategies for pavement systems.
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