Structural · S-W2D98

Concrete Beam Construction Joint with Keyway and Dowels

Elements

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A concrete construction joint in a concrete beam utilizes a roughened surface interface or a formed keyway. The joint requires a roughened surface with a one-quarter inch amplitude or one three-and-one-half inch tall by one-and-one-half inch thick keyway for beams up to twenty-four inches deep, with an additional keyway provided for every twelve inches of additional beam depth. Keyway width equals the beam width minus five inches, and keyways are spaced equally. Crossing the joint are two number six by eight-foot reinforcing bars spaced equally on each face of the beam. Three stirrups at six inches on center spacing are placed on each side of the construction joint, supplementing the scheduled top bars, bottom bars, and typical stirrups.

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