Corner Breaks

Description

A portion of the slab separated by a crack, which intersects the adjacent transverse and longitudinal joints, describing approximately a 45-degree angle with the direction of traffic. The length of the sides is from 0.3 m to one-half the width of the slab on each side of the corner.

Severity Levels

Low
Crack is not spalled for more than 10 percent of the length of the crack; there is no measurable faulting; and the corner piece is not broken into two or more pieces and has no loss of material and no patching.

Moderate
Crack is spalled at low severity for more than 10 percent of its total length; or faulting of crack or joint is < 13 mm; and the corner piece is not broken into two or more pieces.

High
Crack is spalled at moderate to high severity for more than 10 percent of its total length; or faulting of the crack or joint is ≥ 13 mm; or the corner piece is broken into two or more pieces or contains patch material.

How to Measure

Record number of corner breaks at each severity level. Corner breaks that have been repaired by completely removing all broken pieces and replacing them with patching material (rigid or flexible) should be rated as a patch. If the boundaries of the corner break are visible, then also rate as a high severity corner break. Note: This does not affect the way patches are rated. All patches meeting the size criteria are rated.