Transcript Full Depth Recycling

Full Depth
Reclamation
John Hood, BOMAG Americas
March 9, 2011
Failing Roadways
Failing Roadways
What is Full Depth Reclamation?
1)
Full Depth Reclamation is a rehabilitation process in which
the full flexible pavement section and a pre-determined
portion of the underlying materials (base and/or sub-grade)
are uniformly pulverized and blended resulting in a
homogeneous stabilized base course.
Why Utilize Full Depth Reclamation?
By addressing the entire pavement section, FDR is able to
1)
correct delinquent cross sections, increase the loadbearing strength of the base and use 100% of the existing
materials.
Substantial savings can be realized while meeting
environmental goals and guidelines.
Reasons to utilize Full Depth Reclamation?
1)• Completely eliminates an existing cracking pattern
• Allows for cross section Corrections
• Cost effective when compared to total reconstruction
• Faster and easier than total reconstruction
• Facilitates road widening
• More uniform compaction of processed material
• Environmentally friendly
• Conserves natural resources
General Overview of the Full Depth
Reclamation Process
1)
1) Survey the project to gain a clear overview of the work
to be performed.
2) Take Core Samples to determine the composition of the
road. Take samples at the best and worst portions of
the road.
3) Formulate a plan to address the project including the
weakest areas of the road. Select additives (cement,
calcium chloride, emulsion, foamed bitumen, fly ash,
etcetera to assist with strengthening the base.
General Overview of the Full Depth
Reclamation Process
4) Evaluate the road width and formulate grinding pattern
5) Remove any organic materials (grass, bushes) from
shoulders
6) Ensure and correct proper water drainage from
ditches.
Remove Organic Materials and Correct Water Drainage
General Overview of the Full Depth
Reclamation Process
7) Grind road and predetermined depth of base material
utilizing additional aggregates or additives to insure
maximum strength of the finished base. In some
instances multiple passes are required
8) Compact ground roadway with pad-foot roller
9) Shape roadway with motor grader to desired grade
Initial Grinding of Roadway and Base
Initial Grinding of Roadway and Base
Applying Water or Stabilizing Additive
Compacting the Recycled Roadway
Add Cement Slurry for overly weak area of roadway
Distributing Dry Additive Materials on Roadway
Remix and Compact Cement treated base
Compacting the Recycled Roadway
Grading and Shaping the Recycled Roadway
General Overview of the Full Depth
Reclamation Process
10) Compact roadway with smooth drum or rubber tired
roller to finish recycled base.
11) Apply “Fog Seal” asphalt emulsion or final additive to
allow water to shed off top of roadway and not soak in.
12) Apply Final Additive, Chip Seal or Overlay.
Finish Compacting the Recycled Roadway
Recycled and Stabilized Roadway
Apply “FOG Seal” Asphalt Emulsion
Additional Seal Material and temporary wear course
Roadway Prior to Reclamation
Chip Seal Roadway
Asphalt Overlay Roadway
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END