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

2013 Year In Review

APAI Winter ConferenceJanuary 9, 2014

Matt Beeson, P.E.Asphalt Engineer

PG Binder Index

$406 (2009)

$466 (2010)

$496 (2011)

$560 (2012)

$560 (2012)

$496 (2011)

$466 (2010)

$406 (2009)

$533 (2013)

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 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


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


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


9/1/13 Pay items for HMA Surface, HMA

Intermediate, and HMA Base removed from 402


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


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


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


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


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%


9/1/13 (RSP 400-R-610)

Added 9.5 mm open graded mixture Used as a bond breaking layer for

concrete overlays


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


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


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


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


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!

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

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