Illinois Asphalt Paving Association 1 · 2019-10-28 · Illinois Asphalt Paving Association David...
Transcript of Illinois Asphalt Paving Association 1 · 2019-10-28 · Illinois Asphalt Paving Association David...
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Illinois Asphalt Paving Association
David L. Lippert, P.E. Engineer of Materials and Physical Research
Illinois Department of Transportation
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PG Binder Used in 2010 (thousand tons)
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% Polymer Usage - 2003 to 2010
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20% = 100,000 tons
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AC Price Index
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IDOT AC Price Index Bases
Based upon largest suppliers of previous year
Prices submitted as of first of each month
Average = Index
BMPR Policy Memo 1-08.0 PERFORMANCE GRADED ASPHALT BINDER ACCEPTANCE PROCEDURE
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489.60
474.91
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$/
To
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AC/Crude/Gasoline Price Comparison
IDOT
Other State AC
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489.60
745.15
1067.21
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To
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AC/Crude/Gasoline Price Comparison
IDOT
Crude
Gasoline
Other State AC
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Liquid AC Sampling
at
HMA Plants
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Sampling Points – Let’s Count the Ways
NEAT
AC
POLY
AC
1 2
3
4
5
6
7
AC Pump
Recirculation Line
Dryer Drum or Weigh Bucket
Inject Line
Supply Line
Tanker Unload Line
2
3
4
5
6
1
7
Anti strip Blender
Tanker
Tanker Unload Line
AC Tank Spigot
AC Tank Spigot
AC Tank Line
AC Tank Line
Supply Line
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8 Inject Line
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Sample at closest point to the mix - at
Injection Line
NEAT
AC
AC Pump
Recirculation Line
Dryer Drum or Weigh Bucket
Injection Line
Supply Line
Tanker Unload Line
Anti strip Blender
POLY
AC
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Sample Port
Location per
Specification
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District PG Investigative Field Samples As of 12/31/10
District Sample Total Off Test % Off Test
1 654 12 1.8
2 215 4 1.9
3 121 1 0.8
4 223 0 0
5 176 0 0
6 227 2 0.9
7 209 1 0.5
8 249 7 2.9
9 122 2 1.6
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Fine Mix HMA
Less large stone on large stone
Relies on crushed fine on fine fractions
Larger stone floats in matrix to help
reduce AC content
Why?
Better compaction – especially at joints
Less permeable
Longer life
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Future Roll Out Fine Graded
Slow – more trials 2011
Collect data on lay down
Permeability
Density
Hamburg
Review
Possible trial project in each District for
2012
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Safety Edge
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30o
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Including in new contracts ◦ Starting with State Contracts
◦ LRS to follow
◦ For pavements with no shoulder up to 3’ shoulder
Want to see proven devices used ◦ Strike off plates not allowed per spec
◦ Must compact and produce consistent durable edge
◦ If can’t produce desired edge – deduct tonnage from pay if material is wasted.
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Hot Warm
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Warm Mix Asphalt
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Pre Exp. Feature Work Plan 7
2008-2009 WMA Projects 7
2010 WMA Projects 7
Total number of warm mix contracts 21
Hamburg Wheel
Testing
Over 50,000 tons WMA
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Background
Goal:
• Generation of Permissive Use Specification
• Specification to allow use of additives as well as
foaming technology
• Additives (mineral, chemical, or organic) to be
selected from “Pre Approved” list maintained by
BMPR
Drivers
• Federal Highway Administration
Every Day Counts Innovation
Initiative, Industry, and
Environmental Sustainability
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• Embrace WMA
• Allow bidding up front
• Allow approved additives plus
foam
• Start with N70 and below
Permissive Use Specification
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Time Frame
• Drafting permissive use specification
• May/June - Comments and discussion
incorporated from Districts, FHWA, and
Industry - BMPR Spec
• July - Submit to Design and
Environment
• Effective Jan. 1, 2012
• Bulk of 2011 - Contractor’s Proposal
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• Shingles - No land filling within 30 miles of recycler
• CDD: Credit of 2 for 1 tons shingles recycled for 75% recycle goal
• ILEPA to manage asbestos program
• Requires allowing shingles in state highway construction
• Shall meet or exceed maximum percentage of shingles allowed by Tollway
• Maximize the use of recycled aggregates and other constituents in the mix
HB 1326 HA 03 SB 1543 SA 01
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More HA 3/SA 01
• Reduce carbon footprint • Extend the paving season • Regional Engineers to report at hearings annually
– Usage – Cost savings – Performance
• HMA Producer – Shall not use shingles unless asbestos tested – Must meet ILEPA Section 22.54 if doing own
processing
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Specification developed last year for state wide use
Revised – Effective March 1, 2011
Policy developed last year
BMPR Policy Memo issued August 13, 2010
Requires testing of all tear off material for asbestos
Current versions differs from Tollway’s 1 test/250 ton
Harmonization effort with Tollway
Legislation has effort on hold pending outcome
Asbestos testing final issue
Consultant on board to assist IDOT on asbestos
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Department QC/QA training program materials to be available to apprenticeship programs
Course curricula
Teaching slides
And other materials to teach classes
Third party testers provided with 10 days notice
Department to certify as able to teach/train own members
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RAP/RAS Maximum Shift
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Percent AC Replacement
• Specification becoming complex – RAP Percent
– RAS Percent
– When to grade bump?
• Greatly increasing amount of recycled material
• Changed percent RAP replacement to liquid “binder” replacement
• BMPR RAP spec revised 3/1/11
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Old Usage of FRAP
HMA Mix Level 1 Max % FRAP
N Design Binder/LB Surface Poly Mod
30 35 35 10
50 30 25 10
70 25 20 10
90 20 15 10
105 10 10 10
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New Binder Replacement
HMA Mix Level 1 Max % Binder Replacement FRAP+RAS
N Design Binder/LB Surface Poly Mod
30 35 35 10
50 30 25 10
70 25 20 10
90 20 15 10
105 10 10 10
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Increasing usage of FRAP+RAS
HMA Mix Level 2 Max % Binder Replacement FRAP+RAS
N Design Binder/LB Surface Poly Mod
30 40 40 10
50 40 30 10
70 30 20 10
90 30 20 10
105 30 15 10
Use Hamburg Wheel if over Level 1
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Hamburg Wheel
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Hamburg Wheel
158 Lbs
50 C
50 Passes/Minute
AASHTO T-324
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Specimen Prep
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Fail Pass
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SLOW Implementation Schedule
• 2011
– High Replacement RAP and RAS
– Permissive use Warm Mix
• 2012 - 2013
– Other New mixes (fine graded) and Renewals
• 2014 on
– Full Implementation
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Grade Bumping
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Grade Bumping is Critical
• Low amounts of AC replacement can be tolerated with little or no impact
• Around 20% replacement mix properties are impacted
– Grade bumping policy
• Above 20% - Double bump down
• PG64-22 to PG 58-28
– If not followed – shorter pavement life due to cracking
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20% = 100,000 tons
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PG Grade vs. Replacement AC
PG 64-22
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Audit 20 ILCS 2705/2705-590
Requires Life Cycle Costing (LCC) on all projects over
$500,000
Award construction to lowest LCC
Models based upon data
If don’t have data may use other similar states data
Audit to determine if IDOT following law
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The End
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50
Questions??