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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
application.
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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