American Concrete Pavement Association
This bonded concrete overlay on asphalt (BCOA) thickness design web application
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
(ICT), the Illinois Department of Transportation (IDOT), and the Federal Highway Administration
(FHWA). The web application reflects the views of the ACPA, who is responsible
for the facts and accuracy of the data presented within it. The contents do not
necessarily reflect the official views or policies of ICT, IDOT, or FHWA, and this application does not constitute a standard, specification, or regulation. 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.
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. 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. 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. Thus, this tool should be treated as a state-of-the-art interim design procedure for BCOA. 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.
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