The paper describes the extent of concrete deterioration and subsequent repairs performed during 1989 at pier 2 of the bayville bridge over mill neck creek in nassau county, new york. the inspection prior to the repairs included visual underwater examination of the concrete and the extraction and testing of concrete cores. the condition of the concrete structure, the degree of erosion damage which hadoccurred and the process used to select the method of repair are described. causes of deterioration of the pier concrete are also discussed. the use of high-strength water permeable fabric as a forming material for concrete repair is described. use of fabric-formed concrete is well-suited to underwater repairs where placement of conventionally-formed concrete is both expensive and unreliable. concrete mix proportioning and placement in underwater repair are described. this paper appears in transportation research record no. 1290, third bridge engineering conference, march 10-13, 1991, denver, colorado, volume 1.
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