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 - Porous Friction Course

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
In a 1 square foot (1/10 square meter) representative sample, the number of aggregate pieces missing is between 5 and 20 and/ or the number of missing aggregate clusters does not exceed 1.
Medium
In a 1 square foot (1/10 square meter) representative sample, the number of aggregate pieces missing is between 21 and 40 and/ or the number of missing aggregate clusters is greater than 1 but does not exceed 25 percent of the area.
High
In a 1 square foot (1/10 square meter) representative sample, the number of aggregate pieces missing is over 40 and/ or the number of missing aggregate clusters is greater than 25 percent of the area.