• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Sustainable Streets for Chicagoland… CDOT’s Green Pavement Initiatives
 

Sustainable Streets for Chicagoland… CDOT’s Green Pavement Initiatives

on

  • 1,333 views

 

Statistics

Views

Total Views
1,333
Views on SlideShare
1,247
Embed Views
86

Actions

Likes
0
Downloads
19
Comments
0

4 Embeds 86

http://www.cnt.org 80
http://dev.cnt.org 4
http://www.ilsmartgrid.org 1
http://www.slideshare.net 1

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment
  • 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 Sustainable Streets for Chicagoland… CDOT’s Green Pavement Initiatives Presentation Transcript

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