Estimating ConditionBased Highway Reconstruction Needs

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Estimating Condition-Based Highway
ReconstructionNeeds

• NCHRP 20-24(52) Task 14
• (funded by NCHRP 20-7)

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Estimating Condition-Based ReconstructionNCHRP
20-24(52) Task 14

• Questions about models for C P (HERS NBIAS)
  estimating reconstruction for other than traffic
  or safety
• 20-7 Quick Turnaround funded Task 14 (4 months)
• Survey FHWA, AASHTO State DOTs
• Determine if there is a valid issue
• If so, define possible approaches to address

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Estimating Condition-Based ReconstructionWorking
Group

• FHWA
• Ross Chrichton, Ian Friedland, Steve Gaj, Darren
  Timothy, Steve Sissel
• AASHTO
• Tony Kane, Ken Kobetsky
• State DOTs
• Caltrans Michael Johnson
• Maryland Neil Pedersen
• New York Nancy Ross
• Consultants
• PB - Hal Kassoff, Task Leader
• Cambridge Arlee Reno, Bill Robert, Herb
  Weinblatt
• Alan Pisarski

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Estimating Condition-Based ReconstructionDefinit
ions

• Condition-based physical deterioration (not
  traffic or safety)
• Reconstruction
• Replacement in kind focused on major elements
• Roadway includes full paving section, unsuitable
  sub grade, failed drainage, etc.
• Bridge includes replacement of gt 50 of
  superstructure or substructure

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Estimating Condition-Based ReconstructionIntervi
ewees

• FHWA
• AASHTO
• State DOTs
• Arizona
• Caltrans
• Delaware
• Illinois
• Louisiana
• Maryland
• Michigan
• Nebraska
• New York
• Ohio
• South Carolina
• Tennessee
• Vermont
• Toll Authority
• Pennsylvania Turnpike

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Estimating Condition-Based ReconstructionKey
Findings

• Condition-based Interstate reconstruction needs
  are not insignificant most or all of original
  Interstate not reconstructed for traffic or
  safety will require condition-based
  reconstruction in foreseeable future
• More prevalent in cold climates
• More prevalent in pavements than bridges
  examples abound in both
• Due to variety of causes materials, design
  details, soils, freeze-thaw, excessive traffic,
  higher axle loadings
• Late 1980s/early 1990s turning point in
  durability of constructed pavements and bridges
• Would add up to multiple-billions

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Estimating Condition-Based ReconstructionRecomme
ndations

• Follow-on effort is justified
• Two options presented to Working Group
• Enhanced Models Methods
• Empirical Adjustment
• Enhanced Models Methods Multi-year, Multi-
  millions, Integrated with Models Methods
• Empirical Adjustment One shot adjustment for
  Interstates and similar facilities done
  situationally
• Hybrid proposed by working group Empirical
  approach but adapted to models and methods

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Estimating Condition-Based ReconstructionActions

• Complete report
• Provide information in larger Interstate report
• Decisions by FHWA AASHTO on how to proceed
• Implementing actions through FHWA and NCHRP

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Estimating Condition-Based Highway
ReconstructionNeeds

• Questions?