2013 Year In Review APAI Winter Conference January 9, 2014 Matt Beeson, P.E. Asphalt Engineer.
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Transcript of 2013 Year In Review APAI Winter Conference January 9, 2014 Matt Beeson, P.E. Asphalt Engineer.
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2013 Year In Review
APAI Winter ConferenceJanuary 9, 2014
Matt Beeson, P.E.Asphalt Engineer
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PG Binder Index
$406 (2009)
$466 (2010)
$496 (2011)
$560 (2012)
$560 (2012)
$496 (2011)
$466 (2010)
$406 (2009)
$533 (2013)
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Sample Exchange
Gmb
Year Type N Total S.D. INDOT S.D. Producer S.D.
2008 (9.5 mm) Plant 99 0.007 0.005 0.008
2009 (25.0 mm) Plant 103 0.008 0.005 0.008
2010 (9.5 mm) Plant 105 0.008 0.007 0.008
2011 (19.0 mm) Plant 104 0.008 0.008 0.008
2012 (9.5 mm) Cat 5 Plant 102 0.010 0.010 0.009
2013 (9.5 mm) Cat 2 Plant 100 0.009 0.008 0.010
Gmm
2008 (9.5 mm) Plant 99 0.006 0.004 0.007
2009 (25.0 mm) Plant 103 0.006 0.006 0.006
2010 (9.5 mm) Plant 105 0.005 0.004 0.005
2011 (19.0 mm) Plant 104 0.004 0.004 0.004
2012 (9.5 mm) Cat 5 Plant 102 0.005 0.004 0.006
2013 (9.5 mm) Cat 2 Plant 100 0.005 0.005 0.006
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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
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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
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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
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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
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Standard Specifications Effective for contracts after
9/1/13 Pay items for HMA Surface, HMA
Intermediate, and HMA Base removed from 402
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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
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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
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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
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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
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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%
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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
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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
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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
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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
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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
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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
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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
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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
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Inertial Profilers
Study by INDOT Research is complete
Likely pilot projects in 2014 Spec needs to be
developed/finalized
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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
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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
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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
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Aggregate Bulk Specific Gravity What?
All aggregate Gsb values will be supplied by INDOT
All values for recycled materials supplied by INDOT
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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
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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
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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
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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
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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
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Aggregate Bulk Specific Gravity Where?
Lists will be emailed to mix design labs and HMA management reps
Will also be online
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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
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Coming in 2014 4.75 mm for Higher ESAL
Categories? PWL for SMA? Rubber Modified Asphalt
Binders?
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Coming in 2014 4.75 mm for Higher ESAL
Categories? PWL for SMA? Rubber Modified Asphalt Binders?
Colts win Super Bowl!
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