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Full Depth Reclaiming (FDR)

“Full Depth Reclamation” is the pavement rehabilitation technique in which the full thickness of the asphalt pavement and a predetermined portion of the underlying materials (base, subbase and/or subgrade) is uniformly pulverized and blended to provide an upgraded homogeneous base material. Further stabilization may be enhanced through the use of available additives.

FDR is the rehabilitation technique in which the full thickness of the asphalt pavement and a predetermined portion of the underlying materials (base, subbase and/or subgrade) is uniformly pulverized and blended to provide an upgraded, homogeneous base material. Treatment depths vary depending on the thickness of the existing pavement structure, but generally range between 4 to 12 inches (100 and 300 mm).

FDR consists of pulverization/reclamation of the existing materials, adding more materials (when necessary), mixing, initial shaping of the resultant mix, compaction, final shaping or "tight blading," and application of a bituminous surface or wearing course.
Full Depth Reclamation is generally broken down into four primary disciplines:

  1. Mechanical Stabilization-addition of stone/subbase
  2. Calcium Chloride Stabilization– addition of liquid calcium chloride
  3. Chemical Stabilization–addition of portland, lime-pozzolan, lime fines
  4. Bituminous Stabilization–addition of asphalt emulsion

Benefits Include:

  • Conserve energy/eliminate disposal of old pavement
  • Re-use materials already paid for
  • Reshape crown and cross slope
  • Eliminate reflective cracking potholes, bumps and rutting
  • Enhance structural values
  • Possible pavement reduction
  • FDR is the most cost effective road rehabilitation
  • Reduces freeze thaw cycles