Structural · S-V6BRM

Typical Slab on Grade Joint Details

Materials

Elements

Floors / Slabs Expansion / Control Joints Entrances

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Concrete slabs on grade feature typical joint configurations, including construction joints, saw-cut control joints, and pour-back strips. The construction joint features a keyed or straight interface with slab thickness t and a sawed edge with a one-eighth-inch radius on each side. The control joint detail specifies a saw-cut depth of one-quarter to one-third of the slab thickness t, performed with an early entry saw within the first four to six hours after the final set is achieved. The pour-back strip detail specifies a three-foot or seven-foot wide strip between slab sections, reinforced with number four bars spaced at eighteen inches on center each way that extend a minimum of twenty-four inches into the strip. Slab reinforcement consists of number four bars at eighteen inches on center each way placed at a depth of zero-point-three times t from the top of the slab. The pour-back strip width and placement may be adjusted at the contractor's option.

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