Sustainable Streets for Chicagoland… CDOT’s  Green  Pavement Initiatives Cindy Williams Quality Assurance Manager, CDOT Ju...
Typical Conventional Roadway Design for CDOT <ul><li>Sub-base granular material (non-recycled) </li></ul><ul><li>Portland ...
Initiatives Taken by CDOT <ul><li>Permeable Pavements </li></ul><ul><ul><li>Concrete </li></ul></ul><ul><ul><li>Hot Mix As...
What We’ve Learned
Unique Attributes in Construction w/  Pervious PCC <ul><li>Training - specify </li></ul><ul><li>Material </li></ul><ul><ul...
Revisiting Pervious in 2009 <ul><li>Revising Mix proportioning </li></ul><ul><ul><li>Blending coarse aggregates </li></ul>...
Modified Construction Methods
Key Mixture Considerations regarding  Pervious HMA <ul><li>Followed knowledge base on open-graded / SMA mixes </li></ul><u...
WHY  GTR   liquid AC? <ul><li>Other agencies were on board </li></ul><ul><li>Cook County GTR Task Force  </li></ul><ul><ul...
Pro’s to using GTR liquid AC <ul><li>Limited - No Cost Implications </li></ul><ul><ul><li>No Fibers </li></ul></ul><ul><ul...
Unique Attributes in Construction w/ GTR <ul><li>Plant </li></ul><ul><ul><li>Silo storage </li></ul></ul><ul><li>Field </l...
Monitoring Pervious Applications <ul><li>2 yr program  </li></ul><ul><li>Rutting </li></ul><ul><li>Raveling </li></ul><ul>...
What we learned… maintenance is the key!
<ul><li>High Recycle  HMA </li></ul><ul><li>Low ESAL / N30 Surface Mix </li></ul><ul><li>40% RAP </li></ul><ul><li>10-15% ...
Why Higher Recycle Content Mix?
WMA  - How it came to be... <ul><li>Made sense with ongoing green initiatives within CDOT </li></ul><ul><li>Tollway willin...
Pro’s to WMA <ul><li>Minor Plant Modification </li></ul><ul><ul><li>Evotherm technology </li></ul></ul><ul><li>Produced at...
Future Initiatives for CDOT <ul><li>Recycled PCC </li></ul><ul><ul><li>Back into PCC </li></ul></ul><ul><ul><li>Clean, sub...
What’s holding us back? <ul><li>Time </li></ul><ul><li>Money </li></ul><ul><ul><li>Develop </li></ul></ul><ul><ul><li>Impl...
No-brainers to  Green   YOUR Hardscape <ul><li>Maximize RAP/FRAP in your HMA </li></ul><ul><li>Increasing recycled cementi...
THE END
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Sustainable Streets for Chicagoland… CDOT’s Green Pavement Initiatives

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  • Credit per ton going to GTR of $18/ton or approx 10%
  • Similar to other open graded WRT storage and drain-down
  • Sustainable Streets for Chicagoland… CDOT’s Green Pavement Initiatives

    1. 1. Sustainable Streets for Chicagoland… CDOT’s Green Pavement Initiatives Cindy Williams Quality Assurance Manager, CDOT June 17, 2009
    2. 2. Typical Conventional Roadway Design for CDOT <ul><li>Sub-base granular material (non-recycled) </li></ul><ul><li>Portland Cement Concrete (PCC) base course </li></ul><ul><li>Hot Mix Asphalt (HMA) overlay w/ RAP </li></ul><ul><ul><li>Urban environment allows RAP </li></ul></ul>
    3. 3. Initiatives Taken by CDOT <ul><li>Permeable Pavements </li></ul><ul><ul><li>Concrete </li></ul></ul><ul><ul><li>Hot Mix Asphalt </li></ul></ul><ul><li>Ground Tire Rubber (GTR) </li></ul><ul><li>Higher % Recycle Content </li></ul><ul><ul><li>RAP </li></ul></ul><ul><ul><li>Crushed Concrete </li></ul></ul><ul><li>Warm Mix Asphalt (WMA) </li></ul>
    4. 4. What We’ve Learned
    5. 5. Unique Attributes in Construction w/ Pervious PCC <ul><li>Training - specify </li></ul><ul><li>Material </li></ul><ul><ul><li>No internal vibration </li></ul></ul><ul><ul><li>Unit wt vs. slump/air </li></ul></ul><ul><ul><li>Susceptible to temperature (?) </li></ul></ul><ul><li>Placing / Finishing Equipment </li></ul><ul><li>Curing Critical </li></ul><ul><li>Maintenance / Cleaning </li></ul>
    6. 6. Revisiting Pervious in 2009 <ul><li>Revising Mix proportioning </li></ul><ul><ul><li>Blending coarse aggregates </li></ul></ul><ul><ul><li>Cementitious Amounts / Type </li></ul></ul><ul><ul><li>Unit weights - relation to strength & permeability </li></ul></ul><ul><li>Testing & Acceptance </li></ul><ul><li>Modified Construction Techniques </li></ul>
    7. 7. Modified Construction Methods
    8. 8. Key Mixture Considerations regarding Pervious HMA <ul><li>Followed knowledge base on open-graded / SMA mixes </li></ul><ul><li>Wanted to limit plant modifications to urban producers (fibers) </li></ul><ul><li>Trial Blends with liquid AC options </li></ul><ul><ul><li>Polymer, NO Fibers (drain down issues) </li></ul></ul><ul><ul><li>GTR modified, NO Fibers (as – built) </li></ul></ul>
    9. 9. WHY GTR liquid AC? <ul><li>Other agencies were on board </li></ul><ul><li>Cook County GTR Task Force </li></ul><ul><ul><li>CDOT </li></ul></ul><ul><ul><li>IDOT </li></ul></ul><ul><ul><li>IL Tollway </li></ul></ul><ul><li>Willing to try it </li></ul>
    10. 10. Pro’s to using GTR liquid AC <ul><li>Limited - No Cost Implications </li></ul><ul><ul><li>No Fibers </li></ul></ul><ul><ul><li>No plant modifications </li></ul></ul><ul><li>Environmental goodness </li></ul><ul><ul><li>1 tire / 1 ton </li></ul></ul><ul><li>Terminal Blended = easy to use </li></ul><ul><li>Polymer Equivalent Liquid </li></ul><ul><ul><li>(PG 64-22 + GTR) </li></ul></ul>
    11. 11. Unique Attributes in Construction w/ GTR <ul><li>Plant </li></ul><ul><ul><li>Silo storage </li></ul></ul><ul><li>Field </li></ul><ul><ul><li>Stability </li></ul></ul><ul><ul><ul><li>Min / Max Lifts </li></ul></ul></ul><ul><ul><li>Rollers </li></ul></ul><ul><ul><li>Temperatures </li></ul></ul><ul><li>Maintenance / Cleaning </li></ul>8” Pervious HMA (4” + 2” + 2”)
    12. 12. Monitoring Pervious Applications <ul><li>2 yr program </li></ul><ul><li>Rutting </li></ul><ul><li>Raveling </li></ul><ul><li>Permeability </li></ul><ul><li>Albedo </li></ul>
    13. 13. What we learned… maintenance is the key!
    14. 14. <ul><li>High Recycle HMA </li></ul><ul><li>Low ESAL / N30 Surface Mix </li></ul><ul><li>40% RAP </li></ul><ul><li>10-15% Recycled PCC </li></ul><ul><li>2 nd season added GTR </li></ul><ul><li>CDOT In-House Crews </li></ul>
    15. 15. Why Higher Recycle Content Mix?
    16. 16. WMA - How it came to be... <ul><li>Made sense with ongoing green initiatives within CDOT </li></ul><ul><li>Tollway willing to try, coordinated our efforts (both trials same week) </li></ul><ul><li>No additional cost to CDOT </li></ul><ul><ul><li>Thank you Meadwestvaco, Ogden Materials/Bigane Paving, S.T.A.T.E. Testing and the Tollway </li></ul></ul>
    17. 17. Pro’s to WMA <ul><li>Minor Plant Modification </li></ul><ul><ul><li>Evotherm technology </li></ul></ul><ul><li>Produced at 230˚ F </li></ul><ul><li>Placed from 230˚ - 180˚ F </li></ul><ul><li>Same rolling pattern </li></ul><ul><li>No difference in workability </li></ul><ul><li>Reduced odor, fumes </li></ul><ul><li>Reduced fuel / energy </li></ul><ul><li>Potential to extend season </li></ul>
    18. 18. Future Initiatives for CDOT <ul><li>Recycled PCC </li></ul><ul><ul><li>Back into PCC </li></ul></ul><ul><ul><li>Clean, sub-base material </li></ul></ul><ul><li>Recycled “wash H 2 0” </li></ul><ul><li>FRAP, WMA + GTR </li></ul><ul><li>Modified Pervious Apps </li></ul><ul><li>Cement alternatives </li></ul><ul><li>Recycled shingles in HMA </li></ul>
    19. 19. What’s holding us back? <ul><li>Time </li></ul><ul><li>Money </li></ul><ul><ul><li>Develop </li></ul></ul><ul><ul><li>Implement </li></ul></ul><ul><ul><li>Evaluate performance </li></ul></ul><ul><li>Types of projects / programs willing to try (satisfying funding partners) </li></ul><ul><li>Knowledge base / method to implementation </li></ul>
    20. 20. No-brainers to Green YOUR Hardscape <ul><li>Maximize RAP/FRAP in your HMA </li></ul><ul><li>Increasing recycled cementitious contents </li></ul><ul><li>GTR modified HMA designs </li></ul><ul><li>Increase Pervious Surfaces where opportunities exist </li></ul><ul><li>Other unique opportunities… </li></ul>
    21. 21. THE END

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