TM 5-826-6/AFR 93-5
Figure A-50. High severity raveling/weathering.
Figure A-51. High severity raveling/weathering in porous friction course pavement.
(3) Measuring procedure.
(a) Porous friction courses. Raveling and weathering are measured in square feet of surface area.
Mechanical damage caused by hook drags, tire rims, or snow plows are counted as areas of high-severity raveling and
(b) All other flexible pavement surfaces. Raveling and weathering are measured in square feet of surface
m. Rutting, distress 53.
(1) Description. A rut is a surface depression in the wheel path. Pavement uplift may occur along the sides of
the rut; however, in many instances ruts are noticeable only after a rainfall, when the wheel paths are filled with water.
Rutting stems from a permanent deformation in any of the pavement layers or subgrade, usually caused by consolidation
or lateral movement of the materials due to traffic loads. Significant rutting can lead to major structural failure of the