Deploying Superpave

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Deploying Superpave

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New York City. No cost increase, 1 to 3 years in ... City of Calgary. Better performance at same cost. City of Ottawa. Marked reduction in cracking. Minnesota ... – PowerPoint PPT presentation

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Title: Deploying Superpave


1
Deploying Superpave
  • A Last Look from the TRB Superpave Committee
  • AASHTO SCOH May 6, 2005

2
A Quick History
  • SHRP delivers Superpave in mid-93
  • FHWA begins implementation 1993
  • First state DOT projects 1996
  • TEA-21eliminates funding 1998
  • AASHTO funds via NCHRP 1999
  • TRB Superpave Committee 1999
  • Superpave 2005 Strategic Plan 1999
  • Where are we now? 2005

3
What is Superpave?
  • Asphalt Binder Specs related to traffic and
    climate AASHTO M-320-03
  • Mix design procedures that better simulate
    reality AASHTO R-35-04
  • Aggregate Specs targeting stability, durability,
    and quality control
  • Emphasis on volumetric mix properties permitting
    better construction control

4
Superpave Binder
2005 Survey of AASHTO HSCOM
5
Superpave Mix
Generally used
2005 Survey of AASHTO HSCOM
6
Has It Been Worth It?
  • Economic Benefits of SHRP Research
  • (Little et al., 1997, Texas Transportation Inst.)
  • If binder specs implemented over 10 years,
    national annual discounted agency savings in 10th
    year
  • 482 Million

7
Scant Benefit/Cost Data
  • Only 13 states have gathered data
  • Only 8 have analyzed it.
  • Others plan to gather and analyze data.
  • 4 provinces and 1 turnpike authority have
    gathered data.
  • Committee will recommend a comprehensive look at
    these data

8
Benefit Indicators
  • Washington State
  • 3 cost, 12 to 20 longer performance
  • New York City
  • No cost increase, 1 to 3 years in extra
    performance
  • Ontario
  • -2 cost, 1 to 2 years increase in performance
  • SPS-9
  • Reflective cracking retarded 3 to 4 years
  • Arkansas
  • Considerably fewer problems
  • Connecticut
  • Evidence of reduced rutting
  • Louisiana
  • Less rutting
  • Pennsylvania
  • Rutting problem has been solved.

9
More Indicators
  • City of Calgary
  • Better performance at same cost
  • City of Ottawa
  • Marked reduction in cracking
  • Minnesota
  • Better ride, higher pavement sufficiency,
    slightly less cost
  • Utah
  • 3 years life increase
  • 10 LCC savings
  • Utah DOT Region 2
  • Crack sealing cost down 70
  • Patching costs down 20

10
Coming Soon
  • Simple Performance Test and equipment
  • New mix design guide for hot-mix asphalt
  • Linked to new pavement design guide
  • Improved Asphalt Stripping Test
  • Performance-related tests for modifiers

11
Sources of Success
  • Constancy of Purpose, Consistency of Plan
  • True Government/Industry Partnership
  • Continuous dialogue
  • Broad industry participation in advisory groups
  • Superpave Support Team
  • Innovative Approaches to Deploying Innovation.

12
Superpave 2005
  • Questions?

13
A Cause for Concern?
  • The Rise of Superpave Plus Specifications
  • Additional Specs or Tests
  • What are the Pluses?
  • Prescriptions, Exclusions, Other Tests
  • How Prevalent Are Plus Specs?
  • 21 states in 2002, 34 states in 2005
  • Warrants Continued Monitoring by AASHTO
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