TM 5-826-6/AFR 93-5
combination of load repetition, curling stresses, and shrinkage stresses. (For slabs divided into four or more pieces, see
shattered/intersecting cracks.) Low severity cracks are usually warping- or friction-related and are not considered major
structural distresses. Medium or high severity cracks are usually working cracks and are considered major structural
distresses. Hairline cracks that are only a few feet long and do not extend across the entire slab are rated as shrinkage
(2) Severity levels, unreinforced PCC.
(a) Low severity level (L). One of three conditions exists:
- Nonfilled cracks less than 1/8-inch wide with little or no spalling and no loose particles (no FOD
potential) (figs. A-74 and A-76).
- Filled cracks of any width but filler material must be in satisfactory condition with no faulting or
spalling and no FOD potential (fig. A-75).
Figure A-74. Low severity longitudinal crack.