TM 5-623
Figure B-135. High-severity spalling, corner.
How to Count:
If one or more corner spalls with the same severity level are in a slab, the slab is
counted as one slab with corner spalling. If more than one severity level
occurs, it is counted as one slab with the higher severity level.
Name of Distress:
Spalling, Joint.
Description:
Joint spalling is the breakdown of the slab edges within 2 feet of the joint.
A joint spall usually does not extend vertically through the slab, but intersects the
joint at an angle. Spalling results from:
1. Excessive stresses at the joint caused by traffic loading or by infiltration of
incompressible materials.
2. Weak concrete at the joint caused by overworking.
3. Water accumulation in the joint and freeze-thaw action.
Severity Levels:
Joint Spalling
Length of spall
Spall pieces
Width of spall
<2 feet
>2 feet
Tight-cannot be easily removed (may be a few pieces
<4 inches.............................
L
L
missing)
>4 inches.............................
L
L
Loose-can be removed and some pieces are missing; if
<4 inches.............................
L
M
most or all pieces are missing, spall is shallow, less than
>4 inches.............................
L
M
1 inch.
Missing-most or all pieces have been removed ..............
<4 inches.............................
L
M
>4 inches.............................
M
H
See figures B-136 through B-138.
B-47
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