1 / 23

IDOT Update

IDOT Update. Eric E. Harm Assistant Chief Engineer IAAP - May 17, 2007. Materials Audit. Materials Audit. Office of Auditor General / KPMG Before 2004 (Laid-back) – MISTIC was good enough 2004-6 (Under a microscope) – source documents required. Needed Corrections.

chars
Download Presentation

IDOT Update

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. IDOT Update Eric E. Harm Assistant Chief Engineer IAAP - May 17, 2007

  2. Materials Audit

  3. Materials Audit • Office of Auditor General / KPMG • Before 2004 (Laid-back) – MISTIC was good enough • 2004-6 (Under a microscope) – source documents required

  4. Needed Corrections • Accept and assign all materials using proper Method of Acceptance • Training • Provide up-to-date information for materials inspectors

  5. Impacts to Industry • Sampling/testing of materials that have not been tested in some time will now be done. • Rip Rap – Gradation/sizes need to be measured • Plant site sampling and testing may result in questions back to source • Your cooperation and understanding is greatly appreciated

  6. WipFrag

  7. WipFrag • Working on getting approved for use • Full Implementation - Jan. 2008 (?)

  8. RAP Recycled Asphalt Pavement

  9. % Changes in HMA 1/ For HMA Shoulder and Stabilized Sub-Base (HMA) N-30, the amount of RAP shall not exceed 50% of. the mixture 2/ Value of Max % RAP if 3/8 RAP is utilized.

  10. SpG for Natural Aggregate RAP • Northern Districts (1 & 2) = 2.660 • Southern Districts (3 – 9) = 2.630 • Steel Slag RAP will still be tested before use • Talking about Fractionating for more consistency

  11. Field VMA

  12. Field VMA • Currently - VMA is tested in the design phase only • Now – VMA will be tested in production phase

  13. Why do we need Field VMA?

  14. Why do we need Field VMA? • Maintain the correct amount of effective (not absorbed) AC • Prevent over & under asphalting • Better tool for trouble shooting/controlling mixes • Purchase mix that better represents mix design • Improved resistance to stripping • Mix durability – uniformity should lead to longer performance

  15. How Aggregates Can Affect VMA • Angularity • Hardness • Specific Gravity

  16. Friction Trailer

  17. Friction Trailer • This week - being calibrated at NASA • New aggregate types are tested with trailer before given friction category for HMA use • 7 years since the new friction policy went into affect

  18. ASR Alkali-Silica Reactivity

  19. Spec. Overview • Each Gravel and Natural Sand Source are: • Being tested using ASTM 1260 • Given an ASR Expansion # • Based on ASR Expansion # • Mitigation may be necessary when used • Various Mitigation Options Available • Limestone and Dolomite Sources are given a predetermined ASR Expansion #

  20. Implementation • Currently, on a trial basis, used in Dist. 1 and 4 • Bigger Concrete Jobs • Future - Statewide Implementation

  21. IDOT Not IDOT

  22. Thank You

More Related