Synthesis of Information Related to Highway Practices. Topic 55-04A. Current Practices and Guidelines for Full-Depth Reclamation (FDR)

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. Information to be gathered includes (but is not limited to): Existing specifications and guidelines related to FDR mix design; State DOT classification of FDR types; FDR design criteria and consideration of traffic loads and environment conditions; Site selection and pre-design investigation for FDR; Post-construction verification of FDR properties; Properties of FDR base used in pavement design; Current practices in FDR construction and QA; Mix design and test methods to evaluate FDR quality, e.g., Superpave gyratory compaction, modulus, stiffness, curing time, long-term strength gain, etc.; Selection of stabilization additive, e.g., cement, aggregates, foamed asphalt, emulsified asphalt; Tests to make time-critical decisions regarding opening to traffic and surfacing of the FDR base, such as raveling resistance using a short-pin raveling test and shear resistance using a long-pin shear test; Performance and cost effectiveness of different methods used to mitigate cracking in hot mix asphalt (HMA) overlay on the (stabilized) FDR layer, such as crack relief layer, micro-surfacing, chip-seal, microcracking, etc.; Efforts to quantify the sustainability of FDR; Life-cycle cost analysis of FDR by DOTs; Potential to utilize quarry by-products (QB) in FDR; Time savings during construction. Information in this synthesis will be gathered through a literature review, a survey of state DOTs, and follow-up interviews with selected agencies for the development of case examples. Information gaps and suggestions for research to address those gaps will be identified.

• Record URL:
  http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=5646
• Supplemental Notes:
  • This project replaces NCHRP Project 20-05/Topic 55-04, in order to accomodate a change in contract vehicles.

Language

• English

Project

• Funding: $55000
• Contract Numbers:

  Project 20-05, Topic 55-04A

• Sponsor Organizations:

  National Cooperative Highway Research Program

  Transportation Research Board
  500 Fifth Street, NW
  Washington, DC  United States  20001

  American Association of State Highway and Transportation Officials (AASHTO)

  444 North Capitol Street, NW
  Washington, DC  United States  20001

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Project Managers:

  Harrigan, Edward

• Performing Organizations:

  Sias Consulting, LLC

  ,    
• Principal Investigators:

  Sias, Jo

• Start Date: 20240325
• Expected Completion Date: 20250415
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Full-depth reclamation; Guidelines; Literature reviews; Paving; Quality assurance; State of the practice
• Subject Areas: Construction; Highways; Pavements;

Filing Info

• Accession Number: 01913008
• Record Type: Research project
• Source Agency: Transportation Research Board
• Contract Numbers: Project 20-05, Topic 55-04A
• Files: TRB, RIP
• Created Date: Mar 25 2024 4:46PM