![]() Design thicknesses for these overlays tend to be greater than 7 inches. The research on this cell will be done as part of a Multi-state Pooled Fund project TPF-5(165) that will use the MnROAD and other test section data to develop a rational design method for thin concrete overlays.Ĭurrent pavement design methods treat unbonded overlays similar to concrete pavements lying on traditional aggregate base layers. A new thin whitetopping section built on a full depth bituminous cell in poor condition will be constructed to create a test section to help to answer these questions as well as add to the performance database from which a rational design method for whitetopping will be developed. Researchers and pavement designers still question if the data from these test sections can adequately represent the performance of whitetopping on asphalt pavements that show distress (cracking, rutting). ![]() However, the underlying HMA pavements were in good condition and did not represent typical conditions. Some whitetopping cells have been built previously at MnROAD. Whitetopping and unbonded concrete overlays have great potential as pavement rehabilitation methods. Use of this design tool implies acceptance of the terms of use and understanding of the assumptions / limitations of the research on which this tool is based.Performance of Thin Unbonded Concrete on High Volume Roadsĭue to increased traffic congestion and reduced highway construction budgets, emphasis is now being placed on seeking effective rehabilitation techniques for older pavements. American Concrete Pavement Association, its Officers, Board of Directors and Staff are absolved of any responsibility for any decisions made as a result of your use. The user accepts ALL responsibility for decisions made as a result of the use of this design tool. For more details on the design and construction of concrete overlays, see the National Concrete Pavement Technology Center’s (CP Tech Center’s) “Guide to Concrete Overlays,” available in PDF format here or printed format here, the National Concrete Overlay Explorer, or use the contact button below to contact the ACPA or your local ACPA Chapter or State Paving Association. Thus, this tool should be treated as a state-of-the-art interim design procedure for BCOA. ![]() Research to better define the impact of fibers on thin concrete overlays also is ongoing the results of such research will be included in future updates of this tool. For example, research into typical effective temperature gradients and time at the effective temperature gradient for different locations in the United States is currently being conducted and will be incorporated into this web app upon its release. While this thickness designer is based on the latest in bonded concrete overlay on asphalt (BCOA) design methodologies, research into this topic is still ongoing. Designers should understand the assumptions/limitations of the research on which this tool is based and also be knowledgeable about the various types of concrete overlay offerings and design/construction details of each type. Necessarily reflect the official views or policies of ICT, IDOT, or FHWA, and this application does not constitute a standard, specification, or regulation. ![]() The web application reflects the views of the ACPA, who is responsibleįor the facts and accuracy of the data presented within it. (ICT), the Illinois Department of Transportation (IDOT), and the Federal Highway Administration Is based primarily on the results of FHWA-ICT-08-016, " Design and Concrete Material Requirements for Ultra-Thin Whitetopping", a research project conducted in cooperation with the Illinois Center for Transportation at the University of Illinois This bonded concrete overlay on asphalt (BCOA) thickness design web application
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