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WARRANTED HOT MIX ASPHALT PAVEMENTS: History and Overview

WARRANTED HOT MIX ASPHALT PAVEMENTS: History and Overview. IN THE BEGINNING. First US HMA (1870’s). HISTORY. 1890’s to 1920’s HMA patented 10 or 15 year warranty material and workmanship. Warren Brothers Warranty Seal. HISTORY. 1920’s patent protection lost warranties discontinued

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WARRANTED HOT MIX ASPHALT PAVEMENTS: History and Overview

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  1. WARRANTED HOT MIXASPHALT PAVEMENTS:History and Overview

  2. IN THE BEGINNING • First US HMA (1870’s)

  3. HISTORY • 1890’s to 1920’s • HMA patented • 10 or 15 year warranty • material and workmanship

  4. Warren Brothers Warranty Seal

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

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

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

  8. TRANSPORTATION RESEARCH BOARD • 1992 • committee formed • 1994 • workshop held • “Development of Pavement PerformanceMeasures in the contract Equation”

  9. TRB WORKSHOP OUTCOME Two methods for specifying performance • predict performance (lab tests) • measure performance (warranty)

  10. Warranty Types • Materials and Workmanship • Performance

  11. Materials and Workmanship Warranty • Follow state specifications • Define unacceptable performance • If problem, forensic to determine if specifications were met

  12. Performance Warranty • Contractor sets specifications • Define unacceptable performance • If problem, contractor responsible for repair

  13. Warranty Specification Details • Acceptance Criteria • Performance criteria • Size of elements • Pavement evaluation • Dispute resolution

  14. Warranty Acceptance Criteria • Quality control plan • Certification of project

  15. Warranty Performance Criteria • Engineering Properties • rutting • cracking • raveling

  16. Warranty Performance Criteria • User Properties • smoothness • safety (hydroplaning in ruts) • safety (friction number)

  17. Warranty Element Size • Entire Project • Mile • Tenths of mile

  18. Warranty Pavement Evaluation • How often? • By who? • Sample rate? • Flow of information?

  19. Warranty Dispute Resolution • Pre-define method to resolve dispute • Parties agree before hand on method of resolution

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

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

  22. THE END

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