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2013 Year In Review APAI Winter Conference January 9, 2014 Matt Beeson, P.E. Asphalt Engineer

2013 Year In Review APAI Winter Conference January 9, 2014 Matt Beeson, P.E. Asphalt Engineer. PG Binder Index. $560 (2012). $533 (2013 ). $560 (2012). $496 (2011). $466 (2010). $496 (2011). $466 (2010). $406 (2009). $406 (2009). Sample Exchange. Standard Specifications.

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2013 Year In Review APAI Winter Conference January 9, 2014 Matt Beeson, P.E. Asphalt Engineer

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  1. 2013 Year In Review APAI Winter Conference January 9, 2014 Matt Beeson, P.E. Asphalt Engineer

  2. PG Binder Index $560 (2012) $533 (2013) $560 (2012) $496 (2011) $466 (2010) $496 (2011) $466 (2010) $406 (2009) $406 (2009)

  3. Sample Exchange

  4. Standard Specifications • 2013 Spec Changes • Effective for contracts after 9/1/13 • in.gov/indot • Doing Business with INDOT • Standards and Specifications • Standard Specifications – 2014 • Special Provisions and Recurring Plan Details – September 2013 edition • 400-R-610 • 401-R-581

  5. Standard Specifications • Effective for contracts after 9/1/13 • Acceptance of QC/QA mixtures less than 300 t will be by Type D Certification and standard rolling train

  6. Standard Specifications • Effective for contracts after 9/1/13 • The first 300 t of the first sublot of the first lot for each mixture pay item will not be sampled • Differs from the previous method of not sampling the first 300 t for each DMF/JMF

  7. Standard Specifications • Effective for contracts after 9/1/13 • If the original contract pay item quantity for a surface mixture is less than or equal to one sublot • The item will be exempt from profilograph • Smoothness will be by 16 ft. straightedge

  8. Standard Specifications • Effective for contracts after 9/1/13 • Pay items for HMA Surface, HMA Intermediate, and HMA Base removed from 402

  9. Standard Specifications • Effective for contracts after 9/1/13 • Intention is to have all mainline pavements accepted by 401 QC/QA • 402 was originally intended for miscellaneous mixtures that could not be plate sampled • Removing pay items prevents designers from selecting 402 • Hand-in-hand with less than 300t change

  10. Standard Specifications • Effective for contracts after 9/1/13 • Will not affect any remaining pay items in 402 or other spec sections that reference 402 • Section 304 – HMA Widening • Section 304 – HMA Patching • Section 604 – HMA for Sidewalks • Section 610 – HMA for Approaches • Section 715 – HMA for Structure Installation

  11. Standard Specifications • Effective for contracts after 9/1/13 (RSP 400-R-610) • Modifications to 4.75 mm mixture incorporated in standard specs • Gradation changes • Fineness modulus ≥ 3.30 • Designed at 5.0% air voids • Changes to Dust/effective AC ratio, VFA, FAA

  12. Standard Specifications • Effective for contracts after 9/1/13 (RSP 400-R-610) • Changes intended to increase macrotexture, therefore increasing friction performance • 4.75 mm friction increased by average of 11 FN

  13. Standard Specifications • Effective for contracts after 9/1/13 (RSP 400-R-610) • Acceptance of open graded mixtures less than 300t will be by Type D certification • Air voids tolerance ±3.5%

  14. Standard Specifications • Effective for contracts after 9/1/13 (RSP 400-R-610) • Added 9.5 mm open graded mixture • Used as a bond breaking layer for concrete overlays

  15. Standard Specifications • Effective for contracts after 9/1/13 (RSP 400-R-610) • Plate samples and cores shall not be obtained from areas placed with a widener or other specialty equipment • If random location falls in this area, another location in sublot is chosen • If entire sublot falls in this area, results from previous or subsequent sublots will be used

  16. Standard Specifications • Effective for contracts after 9/1/13 (RSP 400-R-610) • 8 ft. or wider, spec requires use of standard paver • 4 ft. or less, can typically be paved with adjacent lane • 4-8 ft., we understand plate sampling does not give representative sample, and density is difficult to obtain

  17. Standard Specifications • Effective for contracts after 9/1/13 (RSP 401-R-581) • Liquid Asphalt Sealant (a.k.a fog seal) over joint • Curing not occurring quickly enough with AE-F material, especially in colder weather • Changed to AE-NT or SS-1h at ½ the spray rate of AE-F • Also, liquid asphalt sealant is now a separate pay item from joint adhesive

  18. Construction Memorandum • Construction Memo 13-11 • Clarification of proofrolling language in 401.11 • “All partially completed sections of roadway that are 8 in. or less in thickness shall be proofrolled prior to the placement of additional materials…” • This is only required when 8 in. or less are left over the winter

  19. ITM 221 • ITM 221 – High Volume Surface Aggregates for HMA • Test section placed on I-265 fall 2012 • After 1 year, friction values of test aggregate 1 FN less than control • 2 more candidate aggregates to be tested this year

  20. JTRP SPR-3624 • Optimizing Laboratory Mixture Design as it Relates to Field Compaction in order to Improve Hot-Mix Asphalt Durability • Design mix at 5% air voids and compact in field to 5% air voids • Lower design gyrations (30-50) • Improve durability/reduce oxidation • Initial results positive • 1 field trial done, more to come

  21. QC/QA HMA Certified Tech • Changes to program • Certified Technicians are required to be Qualified Technicians • Can be already Qualified, or complete qualification after Certified Tech course • Current Certified Technicians not qualified are grandfathered from qualification • 3 day course + 1 day exam • Previously 4 days + 1 day exam • Removed hands-on tests, streamlined other areas

  22. Inertial Profilers • Study by INDOT Research is complete • Likely pilot projects in 2014 • Spec needs to be developed/finalized

  23. Aggregate Bulk Specific Gravity • Effective for contracts let after 10/1/13 • All mix designs submitted required to use aggregate Gsb values from INDOT list

  24. Aggregate Bulk Specific Gravity • Why? • In-depth review of mix designs found consistently inflated aggregate Gsb values being submitted • Values were within our previous acceptable range • But, its not possible for so many Contractor values to be above INDOT values in a true distribution

  25. Aggregate Bulk Specific Gravity • Why? • Inflation of Gsb allows lower binder content • Since the Gsb is not actually correct, the mixture is under-asphalted • Mixture durability suffers

  26. Aggregate Bulk Specific Gravity • What? • All aggregate Gsb values will be supplied by INDOT • All values for recycled materials supplied by INDOT

  27. Aggregate Bulk Specific Gravity • How? • Current list compiled using INDOT quality sample data • 5-point moving average, where possible • Values on list for 8s, 11s, sands • Other products: • Fineness Modulus ≥ 6.00 – 8s • 3.50 < Fineness Modulus < 6.00 – 11s • Fineness Modulus ≤ 3.50 - Sand

  28. Aggregate Bulk Specific Gravity • How? • All aggregate products were included on list that had available values • New sources new/missing ledges, benches, etc • INDOT will obtain samples and publish new values • Man-Made Materials (slags) • Individual captive stockpiles may be set up by HMA Producer – INDOT will sample and provide value

  29. Aggregate Bulk Specific Gravity • How? • Gsb of RAP • 2.640 • If your RAP Gsb is greater than 2.720 or less than 2.560 • INDOT will sample individual captive stockpiles and provide value • Gsb of RAS • 2.500 • Gsb of baghouse fines/mineral filler • 2.800

  30. Aggregate Bulk Specific Gravity • When? • Full Gsb list will be published once per year • New values will be compared to current • If different by more than 2 std. deviations, an investigation will be launched and additional samples possibly taken • List addendums will be published throughout the year as needed

  31. Aggregate Bulk Specific Gravity • When? • Required for mixture produced on contracts let after 10/1/13 • Reference designs allowable • Must be submitted with new Gsb values from list • Any affected properties (VMA, VFA, FAA, etc) must be recalculated • If any property falls outside spec limits, a redesign is required

  32. Aggregate Bulk Specific Gravity • Where? • Lists will be emailed to mix design labs and HMA management reps • Will also be online

  33. Aggregate Bulk Specific Gravity • But what about ……? • Values won’t be 100% exact • Level playing field • Gsb values are part of overall blend • Common sense • Communication with District/OMM as early as possible • We want this to work for both Contractors and INDOT

  34. Coming in 2014 • 4.75 mm for Higher ESAL Categories? • PWL for SMA? • Rubber Modified Asphalt Binders?

  35. Coming in 2014 • 4.75 mm for Higher ESAL Categories? • PWL for SMA? • Rubber Modified Asphalt Binders? • Colts win Super Bowl!

  36. Questions? Matt Beeson, P.E. Asphalt Engineer (317) 610-7251 x216 mbeeson@indot.in.gov

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