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
cracks.
(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.
A-43
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