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IDOT UPDATE

IDOT UPDATE. Illinois Association of Aggregate Producers Eric E. Harm, PE Assistant Chief Engineer May 18, 2006. New Staffing. Director of Highways – Milt Sees Chief of Staff – Clayton Harris III Chief of Operations – Brice Sheriff Engineer of Tests – Matt Mueller. SAFETEA-LU.

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IDOT UPDATE

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  1. IDOT UPDATE Illinois Association of Aggregate Producers Eric E. Harm, PE Assistant Chief Engineer May 18, 2006

  2. New Staffing • Director of Highways – Milt Sees • Chief of Staff – Clayton Harris III • Chief of Operations – Brice Sheriff • Engineer of Tests – Matt Mueller

  3. SAFETEA-LU • August 10, 2005 • $295 B Nationwide • $6.18 B Illinois (33% increase) • Safety Emphasis

  4. Earmarks • $1.25 B Highway Earmarks • Over 300 Earmarks • Required Match $315 M • Shortfall ± $8 B

  5. Downside • Locals have to match • Obligation Ceiling ≈ 85% • Funds are not upfront • Cost of projects up • Mix of projects

  6. High Profile Earmarks • New Mississippi River Bridge • $164 M plus $75 M for Missouri • O’Hare Western Access • $140 M • Prairie Parkway • $207 M • River Bridge in Quad-Cities • $12 M plus $48 M for Iowa

  7. Bond Program ?

  8. Recycling Reclaimed Asphalt Pavement (RAP)

  9. Let’s Rap on RAP • Usage is in Chapter 53 BD&E Manual. • Used successfully for 20 years. • Improvements made over the years.

  10. What’s Driving The Equation? • Aging system • Few bare pavements to overlay (How many bare pavements did you drive over to get here?) • Limited new construction • Mill and Fill 1:1 • Results in excess • Newer mixes with polymer limit RAP usage

  11. What’s Driving The Equation? • Problem areas • Currently urban • State wide in future

  12. More RAP’n • Some agencies are not allowing RAP by showing “0% RAP” on plans. • SB 120 introduced: • All mixes to use RAP and Rubber Tires. • Died in committee. • Need to follow sound usage of resources or it will be legislated to us.

  13. S = I - O Storage = Inflow - Outflow Piles of RAP = Milling – Reuse Depends upon: Allowable RAP usage

  14. Recycling Summit – 3 meetings • RAP as aggregate. • Revisit RAP use in HMA. • Concrete as Aggregate.

  15. RAP as an Aggregate • Increase usage for Non-Quality uses • Look into ways of testing for Quality uses

  16. RAP into HMA • Increase %’s • Allow RAP in Polymer Mixes

  17. Recycled Concrete as Aggregate • Change sampling stockpile to 10,000T • Use in HMA?

  18. ASR Alkali Silica Reactivity

  19. Alkali-Silica Reaction (ASR) • Alkalies React with Silica • Alkalies from Cement/Cementitious Materials • Silica from Aggregate • Needs Water • Gel is Formed • Expands and Cracks The Concrete

  20. ASR on IDOT System • ASR Confirmed in Districts 3, 4, and 8 • Four bridge parapets • Two bridge medians • Two bridge decks • One pavement • Constructed Between 1985 and 1997

  21. Cedar Street Bridge Extension (1988)

  22. Cedar Street Bridge Median (1988)

  23. I-255 Pavement (1985-86)

  24. IL 116 over I-39 (1990)

  25. IL 116 over I-39

  26. IL 116 over I-39 Optical micrograph showing ASR gel fully filling circular void in center and partially filling circular void to left (width of field is 1.4 mm).

  27. IL 251 over Mackinaw River (1992)

  28. CTL Report: Cracking Related to ASR IL 29 (1997)

  29. Alkali-Silica Reaction (ASR) • Why So Long to Find This Problem? • FHWA Training • ASR Takes 5-15 Years to Manifest Itself • Requires Cores (Assumed D-Cracking) • Luck Because Low Alkali Cements Have Been Used in Highly Reactive Locations

  30. Alkali-Silica Reaction (ASR) • Current Status • Specification Is In Final Draft Form • Industry Has Provided Numerous Suggestions For Development • Specification Intent Is To Provide Reasonable ASR Protection • No Intent To Burden Any One Industry

  31. Quality Tests Streamlining

  32. Quality Tests • Current: Every Year • New: Every Year or Every Other Year

  33. Quality Tests • Will Not Apply To: • Special Provision • Recycled Products

  34. Quality Tests (Coarse) • Tests Looked At: • Soundness • Abrasion • Count

  35. Quality Tests (Fine) • Tests Looked At: • Soundness • Count • Minus (-) #200

  36. Quality Tests • Reviewed 10 Years of Test Data • Entire Ledge Was Rated • This Year: • All every year and ½ of every other year • Next Year: • All every year and other ½ plus any left from this year

  37. Freeze-thaw Tests • Current Frequency >0.030 – Every Year <0.030 – Every Other Year

  38. Freeze-thaw Tests • New Frequency >0.030 – Every Year 0.015 – 0.030 – Every Other Year <0.015 – Every Three Years

  39. Quality on Tickets

  40. New Approved List • Alphabetical • P/S # • Quality on Tickets (June 1, 2006) • Ticket Designation • Material Approval

  41. Quality on Tickets • Thanks • Being rolled out this year!

  42. Thank You!

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