TRCS Portal 2025

Inspection Guidelines

OverviewAC Distress MeasurementPCC Distress Measurement
Alligator or Fatigue CrackingBleedingBlock CrackingCorrugationDepressionJet Blast ErosionJoint Reflection Cracking From PCCLongitudinal and Transverse CrackingOil SpillagePatching and Utility Cut PatchPolished AggregateRaveling - Dense MixRaveling - Slurry Seal or Coal Tar Over Dense MixRaveling - Porous Friction CourseRuttingShoving of Asphalt Pavement by PCC SlabsSlippage CrackingSwellWeathering - Surface Wear - Dense Mix Asphalt

Raveling - Dense Mix

Raveling is the dislodging of coarse aggregate particles from the pavement surface. As used herein, coarse aggregate refers to predominant coarse aggregate sizes of the asphalt mix. Aggregate clusters refer to when more than one adjoining coarse aggregate piece is missing. If in doubt about a severity level, three representative areas of 1 square yard (1 square meter) each should be examined and the number of missing coarse aggregate particles counted.

How to Measure

Raveling is measured in square feet (square meters) of surface area. Mechanical damage caused by hook drags, tire rims, or snowplows is counted as areas of high severity raveling.

SeverityDistress ExampleDescription
Low
Low severity occurs if any one of these conditions exist: (1) In a square yard (square meter) representative area, the number of coarse aggregate particles missing is between 5 and 20. (2) Missing aggregate clusters is less than 2 percent of the examined square yard (square meter) area. In low severity raveling, there is little or no FOD potential.
Medium
Medium severity occurs if any one of these conditions exist: (1) In a square yard (square meter) representative area, the number of coarse aggregate particles missing is between 21 and 40.  (2) Missing aggregate clusters is between 2 and 10 percent of the examined square yard (square meter) area. In medium severity raveling, there is some FOD potential.
High
High severity occurs if any one of these conditions exist: (1) In a square yard (square meter) representative area, the number of coarse aggregate particles missing is over 40.  (2) Missing aggregate clusters is more than 10 percent of the examined square yard (square meter) area. In high severity raveling, there is significant FOD potential.