TM 5-826-6/AFR 93-5
Figure A-123. Shrinkage crack, case 2
(3) Counting procedure. If one or more shrinkage cracks exist on one particular slab, the slab is counted: as
one slab with shrinkage cracks
dd. Sapling (transverse and longitudinal joint), distress 74.
(1) Description. Joint sapling is the breakdown of the slab edges within 2 feet of the side of the joint A joint spall
usually does not extend vertically through the slab but intersects the joint at an angle. Sapling results from excessive
stresses at the joint or crack caused by infiltration of incompressible materials or traffic load. Weak concrete at the joint
(caused by overworking) combined with traffic loads is another cause o sapling.
(2) Severity levels.
(a) Low severity level (L).
- Spall over 2 feet long:
- Spall is broken into no more than three pieces defined by low or medium severity cracks and little or no FOD
potential exists.
- Joint is lightly frayed with little or no loose or missing material (no FOD potential).
- Spall less than 2 feet long: spall is broken into pieces or fragmented with loose or missing material little FOD or tire
damage potential) (figs. A-124 and A-125). If the frayed area was less than 2 feet long, it would not be counted.
A-69
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