WARRANTED HOT MIX ASPHALT PAVEMENTS: History and Overview

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WARRANTED HOT MIXASPHALT PAVEMENTSHistory
and Overview
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IN THE BEGINNING

• First US HMA (1870s)

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HISTORY

• 1890s to 1920s
• HMA patented
• 10 or 15 year warranty
• material and workmanship

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Warren Brothers Warranty Seal
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HISTORY

• 1920s
• patent protection lost
• warranties discontinued
• 1950s
• federal participation
• state responsible for maintenance
• warranties not allowed

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HISTORY

• 1990
• European Asphalt Study Tour
• FHWA Special Experimental Project 14
• innovative contracting methods (includes
  warranties)

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HISTORY

• 1993
• first pavement warranty project
• 1995
• three warranty projects
• 1996
• seven warranty projects
• 1997
• more than 20 warranty projects

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TRANSPORTATION RESEARCH BOARD

• 1992
• committee formed
• 1994
• workshop held
• Development of Pavement PerformanceMeasures in
  the contract Equation

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TRB WORKSHOP OUTCOME

• Two methods for specifying performance
• predict performance (lab tests)
• measure performance (warranty)

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Warranty Types

• Materials and Workmanship
• Performance

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Materials and Workmanship Warranty

• Follow state specifications
• Define unacceptable performance
• If problem, forensic to determine if
  specifications were met

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Performance Warranty

• Contractor sets specifications
• Define unacceptable performance
• If problem, contractor responsible for repair

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Warranty Specification Details

• Acceptance Criteria
• Performance criteria
• Size of elements
• Pavement evaluation
• Dispute resolution

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Warranty Acceptance Criteria

• Quality control plan
• Certification of project

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Warranty Performance Criteria

• Engineering Properties
• rutting
• cracking
• raveling

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Warranty Performance Criteria

• User Properties
• smoothness
• safety (hydroplaning in ruts)
• safety (friction number)

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Warranty Element Size

• Entire Project
• Mile
• Tenths of mile

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Warranty Pavement Evaluation

• How often?
• By who?
• Sample rate?
• Flow of information?

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Warranty Dispute Resolution

• Pre-define method to resolve dispute
• Parties agree before hand on method of resolution

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BENEFITS

• definition of success
• balanced risk
• innovation rewarded
• non-confrontational construction
• improved quality

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Close

• Warranties used in the past
• use discontinued from 1920s to 1990s
• reintroduced based on European experience
• focus on customer satisfaction

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