TM 5-623
M-Shove causes medium-severity ride quality (fig B-61).
Figure B-61. Medium-severity shoving approaching high
Figure B-60. Low-severity shoving.
severity.
H-Shove causes high-severity ride quality (fig B-62).
How to Measure:
Shoves are measured in square feet of surface area.
Shoves occurring in patches are considered in rating the patch, not as a separate
distress.
Name of Distress:
Slippage Cracking.
Description:
Slippage cracks are crescent or half-moon-shaped cracks having two ends
pointing away from the direction of traffic. They are produced when breaking
or turning wheels cause the pavement surface to slide or deform. This
distress usually occurs when there is a low-strength surface mix or a poor
bond between the surface and the next layer of the pavement structure.
Severity Levels:
L-Average crack width is less than % inch (fig B-63).
Figure B-63. Low-severity slippage cracking.
Figure B-62. High-severity shoving.
M-One of the following conditions exists (fig B-64):
1. Average crack width is between X and 1 inches.
2. The area around the crack is broken into tight-fitting pieces.
H-One of the following conditions exists (fig B-65):
B-21
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