Section 11.7 of American Concrete Institute (ACI) 318-95 contains design provisions for conditions where direct shear transfer through shear-friction should be considered. Such conditions include an interface between concretes cast at different times. Shear-friction capacity is defined by this code as a function of steel reinforcement area contained in the interface and treatment provided to the interface before the new concrete is cast against the hardened concrete. The code also considers the presence of permanent net compression across the interface and specifies an upper limit on interface shear capacity. The test results discussed in this paper are used to verify and extend the application of shear-friction provisions currently incorporated in the ACI Code. Modification and expansion of the current code are proposed in light of the additional research information available to date.
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