Investigating Performance of Bonded Concrete Overlays
Publication: Journal of Performance of Constructed Facilities
Volume 12, Issue 2
Abstract
A bonded concrete overlay (BCO) is a concrete pavement rehabilitation method used to extend the life of an existing concrete pavement. The BCO should bond fully with the existing concrete, leading to a thicker composite pavement section, a much stiffer pavement, and a considerable decrease in pavement stresses. For one project, cost estimates for a BCO were half as much as for full-depth replacement of a pavement. In some cases BCOs have delaminated shortly after construction. This paper proposes a framework for identifying the causes of early age delamination in BCOs. The early age behavior of newly constructed BCOs is examined. The factors affecting the long-term performance of the BCO are the quality of the surface preparation, the materials used in the BCO, and the curing of the BCO. Weather monitoring during BCO construction is recommended. Methods of detecting and mapping delaminations are discussed. Several BCO delamination case studies are analyzed using this framework. The model is useful not only for investigating BCO performance but also for understanding and preparing BCO construction specifications.
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Copyright © 1998 American Society of Civil Engineers.
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Published online: May 1, 1998
Published in print: May 1998
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