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Improving concrete overlay construction : executive summary.
  • Published Date:
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Filetype[PDF-3.19 MB]

  • Publication/ Report Number:
    IHRB Project TR-600
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  • Edition:
    Executive summary.
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  • Abstract:
    As the US highway system ages and available funding diminishes, transportation agencies

    are looking for effective methods for preserving and extending the life of existing

    pavements. These agencies are also being encouraged to minimize construction times and

    reduce the impact to the traveling public. Currently, the most common method of

    rehabilitating an existing roadway surface is through an HMA overlay; however, high oil

    prices have caused designers and agencies to consider other methods. One alternative to

    the traditional HMA overlay is a concrete overlay. The Iowa Department of Transportation

    (Iowa DOT) and Iowa counties and cities have completed about 1,000 miles of concrete

    overlays that are in use and are serving the traveling public today.

    Despite the completion of hundreds of projects, some agencies are reluctant to use

    concrete overlays, believing that they are expensive, difficult to build, and have limited


    To address these concerns, the National Concrete Pavement Technology Center at Iowa

    State University developed a guide document to assist engineers in concrete overlay design

    and construction. The Guide to Concrete Overlays was published in September 2008 and

    includes detailed information on evaluating existing pavements as concrete overlay

    candidates, selecting and designing the appropriate type of concrete overlay, and guidance

    on concrete overlay construction. Since the publication of this guide, the need has arisen to

    develop methods to improve concrete overlay efficiency utilizing current technology,

    investigate innovative materials for use as bond breakers, and reduce the inconvenience to

    the public with improved methods of traffic control and increased opening time.

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