A crack that intersects the PCC slab joints near the corner. “Near the corner” is typically defined as within about 2 m (6 ft) or so. A corner break extends through the entire slab and is caused by high corner stresses.
Roughness, moisture infiltration, severe corner breaks will fault, spall and disintegrate
Severe corner stresses caused by load repetitions combined with a loss of support, poor load transfer across the joint, curling stresses and warping stresses.