Abstract
In 1997, the Florida Department of Transportation (FDOT) funded a study to evaluate interface bond from full-scale tests. This paper presents results from model and full-scale tests to assess the interface bond between a cast-in-place concrete seal slab and steel H-piles in cofferdams, which are usually required in the construction of bridge foundations over waterways. Three seal slab placement conditions--freshwater, saltwater, and bentonite slurry--were evaluated and results compared against controls where no fluid was displaced by the concrete. The results show that significant bond stresses developed even in the worst placement condition. Recommendations made for revising current values in specifications have already been implemented by FDOT.
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