The National Academies

NCHRP Synthesis 20-05/Topic 55-04 [Final (Synthesis)]

Current Practices and Guidelines for Full-Depth Reclamation (FDR)
[ NCHRP 20-05 (Synthesis of Information Related to Highway Practices) ]

  Project Data
Funds: $55,000
Staff Responsibility: Edward T. Harrigan
Research Agency: Jo E. Sias
Principal Investigator: Jo E. Sias
Effective Date: 10/15/2023
Completion Date: 3/25/2024
Comments: This project has beed replaced by NCHRP Project 20-05/Topic 55-04, in order to accomodate a change in contract vehicles.
Fiscal Year: 2024

Final Scope of Work

Full-Depth Reclamation (FDR) is an in-place recycling method for reconstruction and rehabilitation of flexible pavements, as well as construction of new alignments, that uses existing materials as the base for a new surface wearing course. By making effective use of the pavement, paving projects using FDR may be sustainable and may achieve reduced costs. Pulverized roadway materials may be blended with stabilizing additives such as emulsified asphalt, foamed (expanded) asphalt, calcium chloride or Portland cement to form a stiff base layer. FDR is a widespread practice, but state departments of transportation (DOTs) have diverse construction practices and quality assurance procedures for FDR. 

The objective of this synthesis is to document current state DOT practices and guidelines for the use of FDR. 

Work on this synthesis was tranferred to 20-05/Topic 55-04A, due to a change in contract type. The work plan and schedule are unchanged.

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