2013 Year In Review
APAI Winter Conference
January 9, 2014
Matt Beeson, P.E.
Asphalt Engineer
PG Binder Index
PG 64-22 Average Yearly Price
600
$560 (2012)
Price ($ / ton)
550
$533 (2013)
$560 (2012)
500
$496 (2011)
$466 (2010)
450
$496 (2011)
400
$466 (2010)
350
$406 (2009)
$406 (2009)
300
0
2
4
6
Month
8
10
12
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
Standard Specifications
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
2013 Spec Changes
Effective for contracts after 9/1/13
in.gov/indot
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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

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
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


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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)

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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
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Construction Memo 13-11
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Clarification of proofrolling language in
401.11
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“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 HotMix Asphalt Durability
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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


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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

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
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?
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
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
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Why?
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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?
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Current list compiled using INDOT
quality sample data
5-point moving average, where possible
Values on list for 8s, 11s, sands
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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

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Gsb of RAS

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INDOT will sample individual captive stockpiles
and provide value
2.500
Gsb of baghouse fines/mineral filler

2.800
Aggregate Bulk Specific Gravity

When?

Full Gsb list will be published once per
year
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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

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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

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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!
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