Weathering and raveling are the wearing away of the pavement surface caused
by the loss of asphalt or tar binder and dislodged aggregate particles. These
distresses indicate that either the asphalt binder has hardened appreciably or
that a poor-quality mixture is present. In addition, raveling may be caused by
certain types of traffic, e.g., tracked vehicles.
L-Aggregate or binder has started to wear away. In some areas, the surface is
starting to pit (figs B-67 and B-68).
Figure B-67. Low-severity weathering and raveling.
Figure B-68. Low-severity weathering and raveling
caused by tracked vehicles.
M-Aggregate and/or binder has worn away. The surface texture is moderately
rough and pitted (figs B-69 and B-70).
Figure B-69. Medium-severity weathering and raveling.
Figure B-70. Medium-severity weathering and raveling.
H-Aggregate and/or binder has been considerably worn away. The surface
texture is very rough and severely pitted. The pitted areas are less than 4
inches in diameter and less than 3 inch deep; pitted areas larger than this are
counted as potholes (fig B-71).