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Abstract
Splice strength of deformed steel bars embedded in recycled aggregate concrete (RAC) was experimentally investigated using 48 bottom-cast scaled splice beam specimens detailed with unconfined contact lap splices and tested under four-point bending. The following variables were investigated: concrete grade (normal- and medium-strength), recycled concrete aggregate replacement level (0, 50, and 100%), rebar diameter (12 and 20 mm), splice length (15 and 25 db), rebar surface characteristics, and concrete cover to rebar diameter (c/db = 1.25 and 2). Bond behavior and failure modes were noted to be similar in the natural and in the RAC and a regression analysis of the results shows that f′c3/4 provides a good representation of the influence of RAC grade on splice strength. A descriptive bond strength equation has been proposed for RAC.