Full Depth Reclamation
Full Depth Reclamation (FDR) is a rehabilitation technique in which the full thickness of the asphalt pavement and a predetermined portion of the underlying materials (base) is uniformly pulverized and blended to provide a stronger, homogeneous material.
The quality of the existing materials will dictate the strength of the resultant pulverized material, which in some cases, may not be sufficient to support traffic loads and volumes. If the existing road materials will not provide adequate strength after FDR, virgin aggregate, recycled aggregate, reclaimed asphalt pavement, or crushed concrete may be added. Common Stabilizing Agents are portland cement, fly ash, lime, emulsion, and foamed asphalt.
The reclamation process removes the existing asphalt pavement cracks and deterioration since the entire asphalt layer is pulverized to produce an improved, homogeneous granular material on which a new pavement structure can be placed immediately upon completion. Pavements composed of distorted subgrades are only candidates for FDR when additional work is undertaken to correct drainage and subgrade deficiencies.
Reclaiming machines are very mobile and maneuverable to process a wide range of road geometries including urban environments. Due to its versatility, energy savings and reduced natural resource requirement, Full Depth Reclamation provides asset owners with a cost effective means of rehabilitating roads.
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