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Pavement Management
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Raveling

Description

The progressive disintegration of an HMA layer from the surface downward as a result of the dislodgement of aggregate particles.

Figure 1: Raveling due to low density.

Figure 2: Raveling from snowplow operations.

Figure 3: Raveling caused by segregation.

 

Problem

Loose debris on the pavement, roughness, water collecting in the raveled locations resulting in vehicle hydroplaning, loss of skid resistance

Possible Causes

Several including:

  • Loss of bond between aggregate particles and the asphalt binder as a result of:
  • Mechanical dislodging by certain types of traffic (studded tires, snowplow blades or tracked vehicles). The first and fourth figures above show raveling most likely caused by snow plows.

Repair

A raveled pavement should be investigated to determine the root cause of failure. Repair strategies generally fall into one of two categories:

  • Small, localized areas of raveling. Remove the raveled pavement and patch.
  • Large raveled areas indicative of general HMA failure. Remove the damaged pavement and overlay.

 

 

 

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Thanks for sharing Raveling.