Your SlideShare is downloading. ×

Recycling Strategies in Pavement Management

638

Published on

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
638
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
33
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Dragos Andrei, Ph.D., P.E., M.ASCEVirginia Pavement Recycling ConferenceNovember 2012
  • 2.  Database of pavement sections  Location, geometry, surface, rank, etc. Pavement condition over time  Construction date or last major rehab  Pavement Condition at different moments in time ▪ Pavement Condition Index (PCI) ▪ International Roughness Index (IRI) ▪ Other
  • 3. VERY GOOD GOODPavement Condition Index (PCI) FAIR POOR VERY POOR Time/Traffic
  • 4.  Annual Budget M&R Decision Tress  What M&R strategies are available?  When should a certain strategy be used?  What is the cost of each strategy?  What is the EFFECT of each strategy on pavement performance?
  • 5. VERY GOOD M&R Immediate Effect GOODPavement Condition Index (PCI) FAIR M&R Effect POOR Life Extension Original Service Life due to M&R VERY POOR Do Nothing Curve Time/Traffic
  • 6. VERY GOOD Surface GOODPavement Condition Index (PCI) Seal Thin FAIR Overlay Thick POOR Overlay VERY POOR Reconstruction Time/Traffic
  • 7.  We have no experience with it …  Learn from the many agencies that used it with success  Significant progress has been made in the last few years both at national and international level We tried once and had a bad experience …  Equipment and technologies have evolved, use the “RIGHT” approach: ▪ RIGHT STRATEGY ▪ RIGHT PAVEMENT ▪ RIGHT TIME ▪ RIGHT ________?
  • 8.  Does it qualify for federal funding?  Yes, federal funds can be used for recycling programs including full depth reclamation (MAP- 21 Section 1304) Why recycle?  Think about future generations  Makes economic sense  Makes engineering sense
  • 9.  Pavement Recycling •Milling and •Micro Milling •Surface Recycling (Resurfacing) Reclaiming •Remixing Strategies: •Repaving •Cold In-Place Recycling (CIR) •Cold Central Plant Recycling (CCPR) •Pulverization •Mechanical Stabilization •Bituminous Stabilization •Chemical Stabilization
  • 10. VERY GOOD Hot GOODPavement Condition Index (PCI) In-Place FAIR Recycling Cold Planing Cold POOR Recycling Full Depth Reclamation VERY POOR Time/Traffic
  • 11.  PCI range and other agency-specific decision criteria Cost of materials, transport, construction Effect: i.e. life extension and anticipated maintenance costs Impact: green house gas emissions (GHG), energy consumption, duration of traffic closures, amount of waste, etc.
  • 12.  Challenges:  Material costs vary over time and with project location  Different construction equipment/technology will have different “carbon footprint” and will continue to change with time  It is impractical to take measurements on each project Simplified Approach:  Look at the qualitative difference between materials, M&R technologies and the expected life extension.
  • 13. M&R Strategy Typical PCI Range Relative Cost Life Extension “Green” (Years) RatingSurface Seal Good $-$$ 3-5 🍁 🍁 🍁 +HIR Good to Fair $$$ 5 🍁 🍁 +HIR + Seal Good to Fair $$$$ 7 🍁 🍁HIR + Thin Overlay Fair $$$$$ 10 🍁 +Thin Overlay Fair $$$ 7 -Mill + Thin Overlay Fair $$$$ 10 -CIR + Seal Fair $$$ 7 🍁 🍁 🍁CIR + Thin Overlay Fair to Poor $$$$$ 12 🍁 🍁 +CIR + Thick Overlay Poor $$$$$$ 15 🍁 🍁Thick Overlay Poor $$$$$ 12 -Mill + Thick Overlay Poor $$$$$$ 12-15 -
  • 14. M&R Strategy Typical PCI Range Relative Cost Life Extension “Green” (Years) RatingFDR + Seal Poor $$$$$$ 12-15 🍁 🍁FDR + Thin Overlay Poor to Very Poor $$$$$$$ 18 🍁 +FDR + Thick Overlay Poor to Very Poor $$$$$$$$ 20+ 🍁Reconstruction Very Poor $$$$$$$$$$ 20+ -  Notes:  Subjective relative ratings based on engineering judgment and experience  Use as a starting point in selecting M&R strategies
  • 15.  Include R&R in your pavement management decision trees Periodically update your PMS database to fine tune the information specific to each M&R strategy: cost, life extension, “green” benefits Require that pavement rehabilitation recommendations include sustainable alternatives such as HIR, CIR, CCPR, FDR, High-RAP, Warm Mix, etc.
  • 16. Recycled Export In-Place WasteImport ImportVirgin Recyclable Export RAP, Recyclable RAS, Rub ber, RCA
  • 17. HMA HMA Warm MixEnergy, FDRGHG HIR CIR
  • 18. AVOID FAIR • Short Life • Long Life • High Cost • High CostCost Short-Term BETTER BEST Solution • Long Life • Long Life • Short Life • Low Cost • Low Cost • Low Cost • Life Cycle Analysis Life
  • 19. Dragos Andrei, Ph.D., P.E., M.ASCEAssociate Professor, Civil EngineeringTechnical Director, Pavement Recycling and Reclaiming CenterCAL POLY POMONAdandrei@prrcenter.org www.PRRCenter.org

×