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Full Depth Recycling - No Stabilizer (FDR-N)

Full Depth Recycling - No Stabilizer (FDR-N) is an on-grade method of pavement rehabilitation that consists of pulverizing the existing asphalt concrete pavement and a portion of the underlying granular base to a maximum depth of 12 inches, grading and compacting the recycled mixture, and overlaying the recycled surface with a new layer of hot mix asphalt (HMA).

 

pulverization with no stabilizing agent of an aged pavement during daytime construction

Figure 1. Full Depth Recycling - No Stabilizer

Application

FDR-N is best suited for moderate to low volume roadways. During construction, vehicles must traverse an untreated surface, so the project site requires 24-hour pilot car traffic control. FDR-N can treat most pavement distresses that are not caused by subgrade or drainage problems, but it is most cost effective on surfaces requiring digouts of 20% or more by paving area. The upper portion of the pavement structure is completely reworked. Distresses and surface irregularities treatable using pulverization include:

  • Raveling
  • Corrugations
  • Slippage
  • Poor ride quality
  • Potholes
  • Bleeding
  • Shoving
  • Delamination
  • Rutting
  • Cracking

Special Considerations

The following conditions may need to be addressed prior to FDR-NS activities:

  • High traffic volumes
  • Treated bases
  • Numerous shallow utilities
  • Poor drainage

Implementation 

Specifications for FDR-N are in the Standard Specifications Section 30-2 Full Depth Recycling - No Stabilizer.