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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
PG Binder Index $560 (2012) $533 (2013) $560 (2012) $496 (2011) $466 (2010) $496 (2011) $466 (2010) $406 (2009) $406 (2009)
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
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
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
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
Standard Specifications • Effective for contracts after 9/1/13 • Pay items for HMA Surface, HMA Intermediate, and HMA Base removed from 402
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
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
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
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
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%
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
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
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
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
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
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
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
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
Inertial Profilers • Study by INDOT Research is complete • Likely pilot projects in 2014 • Spec needs to be developed/finalized
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
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
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
Aggregate Bulk Specific Gravity • What? • All aggregate Gsb values will be supplied by INDOT • All values for recycled materials supplied by INDOT
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
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
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
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
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
Aggregate Bulk Specific Gravity • Where? • Lists will be emailed to mix design labs and HMA management reps • Will also be online
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
Coming in 2014 • 4.75 mm for Higher ESAL Categories? • PWL for SMA? • Rubber Modified Asphalt Binders?
Coming in 2014 • 4.75 mm for Higher ESAL Categories? • PWL for SMA? • Rubber Modified Asphalt Binders? • Colts win Super Bowl!
Questions? Matt Beeson, P.E. Asphalt Engineer (317) 610-7251 x216 firstname.lastname@example.org