TM 5-623
Severity Levels:
Mean Rut Depth:
L-1/4- to 1/2 inches.
M--> 1/2 to 1 inches.
H-> 1 inches.
See figures B-56 through B-59.
Figure B-57. Low-severity rutting.
Figure B-56. Low-severity rutting.
Figure B-58. Medium-severity rutting.
Figure B-59. High-severity rutting.
How to Measure:
Rutting is measured in square feet of surface area, and its severity is determined
by the mean depth of the rut (see above). The mean rut depth is calculated
by laying a straightedge across the rut, measuring its depth, then using
measurements taken along the length of the rut to compute its mean depth in
inches.
Name of Distress:
Shoving.
Description:
Shoving is a permanent, longitudinal displacement of a localized area of the
pavement surface caused by traffic loading. When traffic pushes against the
pavement, it produces a short, abrupt wave in the pavement surface. This
distress normally occurs only in unstable liquid asphalt mix (cutback or
emulsion) pavements.
Shoves also occur where asphalt pavements abut PCC pavements; the PCC
pavements increase in length and push the asphalt pavement, causing the
shoving.
Severity Levels:
L-Shove causes low-severity ride quality (fig B-60).
B-20
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