Effective Efficient and Elegant Pavement Widening with Full Depth Reclamation Mike Coggins Region 5 Materials Engineer & Resident Engineer February 24, 2012
Talking Points Politics and Projects What can FDR do for you? Economic & Environmental Benefits CDOT Implementation of FDR Emulsified Asphalt added to FDR Next Steps
Interstate Highway System Eisenhower pushed for the building of an interstate highway system and in 1956 signed the Federal- Aid Highway Act. 56 years old in 2012
2020
Franklin D. Roosevelt Promised America a New Deal Jobs bill of 1933-1936 WPA PWA CCC NRA REA
Franklin D. Roosevelt Promised America a New Deal Jobs bill of 1933-1936 WPA PWA CCC NRA REA Works Progress Administration
Franklin D. Roosevelt Promised America a New Deal Jobs bill of 1933-1936 WPA PWA CCC NRA REA Works Progress Administration Public Works Administration
Franklin D. Roosevelt Promised America a New Deal Jobs bill of 1933-1936 WPA PWA CCC NRA REA Works Progress Administration Public Works Administration Civilian Conservation Corps
Franklin D. Roosevelt Promised America a New Deal Jobs bill of 1933-1936 WPA PWA CCC NRA REA Works Progress Administration Public Works Administration Civilian Conservation Corps National Recovery Administration
Franklin D. Roosevelt Promised America a New Deal Jobs bill of 1933-1936 WPA PWA CCC NRA REA Works Progress Administration Public Works Administration Civilian Conservation Corps National Recovery Administration Rural Electric Association
New Economy Sustainability & Materials FDR WMA HMA HIPR CIPR RAP RAS AEFDR
Full Depth Reclamation Dry grinding is a practical way to rehabilitate pavements. Incorporation of RAP into the aggregate base course provides improved structural integrity, increases reliability and preserves the original investment in the roadway.
Pulverizing
Mixing
Grading
Compaction Compaction
Full depth reclamation is an effective pavement rehabilitation treatment on highly distressed roads needing deep repairs.
Keys to Success 1.Reclaimed material shall be mixed with ABC Class 6 in the widened sections and processed across the entire roadway section. 2.Water shall be injected into the mix through the drum and thoroughly mixed into the full depth reclamation process to obtain moisture content. 3.Contractor required to incorporate additional ABC Class 6 into the processed material to provide a minimum of 10 inches as needed to meet final grade.
Benefits of FDR Widening and Flattening
Benefits of FDR Drainage Improvements
Benefits of FDR Drainage improvements Capture subsurface drainage
Benefits of FDR Balance Earthwork
Benefits of FDR Safety improvements Super elevation corrections Passing lanes
Benefits of FDR Roadbed stabilization Subgrade stabilization Muck excavation
Benefits of FDR Proofrolling
Environmental Benefits Reuse/continued use of initial roadway investment
Decreased Use of Materials 100% Recyclable Decreases required quantity of crushed aggregates from pits Decreases extraction of rock from the earth Decreases asphalt cement binder required to construct roads Saves $15-25 per ton depending upon haul distances $
Number of CDOT FDR Projects Per Year 15 11 8 2000 20012002200320042005 4 2006 2007200820092010 0 2011
CDOT FDR Area Treated per Year (SY) 1,500,000 1,125,000 750,000 375,000 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 0
Total Cost of FDR by Year
FDR Area Treated per Year (SY)
Where do we go from here?
Asphalt Emulsion Full Depth Reclamation (AEFDR) is an asphalt pavement rehabilitation process that recycles and rejuvenates the existing pavement surface and subgrade, providing an improved structure for the final paved surface.
Keys to AEFDR Success 1.AEFDR is a separate process. 2.Asphalt emulsion shall be added in the drum of the reclaimer equipment. 3.Emulsion shall be thoroughly mixed into the reclaimed material for a thickness of not less than 6 inches across the entire roadway.
What do we gain? FDR = 0.15 structural coefficient AEFDR = 0.25 structural coefficient
AEFDR is a cost effective pavement rehabilitation technology that could enhance available options for treating fatigued pavements and implement practical pavement
Problems? Do not doubly apply
Concerns? Softening in the heat
Region 5 FDR Projects
Questions?