Re-Entrant Corner

Summary

Re-Entrant Corner - In a concrete slab panel, re-entrant corner is a corner which points into the interior of the panel.

Technical Information

Re-entrant corners are usually undesirable when choosing the joint layout for a concrete floor slab as they significantly increase the risk of cracking. However, sometimes they are unavoidable, due to the shape of the building, a protrusion into the panel from another element of the construction or, most commonly, when square isolation detail has been used around columns.

Trimming reinforcement can be set near the surface of the slab next to the corner to help keep cracks shut and prevent them from propagating further into the panel.

Careful consideration to the joint layout around a re-entrant corner can reduce the risk of cracks occurring.