A significant current issue for federal and public agencies is the maintenance of aging waterfront structures in order to maximize the life of these critical assets. The recent installation of a concrete facing on a steel sheet pile cofferdam represents an atypical solution to a relatively common problem. The cofferdam is part of a submarine maintenance dry dock located on the Hood Canal at Naval Base Kitsap Bangor in Washington State. The concrete facing design considered the following: sheet pile cleaning and preparation, design of the concrete mix and reinforcing, attachment to the existing sheet piles, and concrete jointing. This paper focuses on the implementation and installation challenges of this unique solution and provides a case study that describes the successful use of concrete as a protective coating for an aging cellular cofferdam.
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