Abstract
The investigation reported was carried out with 30 full size beams of varying lengths and sectional dimensions with lap-spliced bars in constant moment region. The beams were tested in a third-point loading system. Three high yield diameter bars -16, 20 and 28 mm – were coated with epoxy over lap and cover was varied to the main bars; this was in an attempt to study the effect of increased cover on bond efficiency of coated reinforcing bars. The ultimate moment from the tests were used to determine the stress developed in the steel rods. The bond efficiency, U/U BS, ie. ratio of the test bond stress and the bond stress recommended in BS8110, was studied for the parameter under investigation. Increased concrete cover was found to increase the bond efficiency of coated reinforcing bars, but the increase was not proportional to the additional cover thickness.
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