Peter Vacura

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Presentation by Peter Vacura of Caltrans on long-life asphalt pavements delivered at the CalAPA Fall Asphalt Pavement Conference held Oct. 24, 2013 in Sacramento, Calif.

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Peter Vacura

  1. 1. LONG LIFE PAVEMENTS Peter Vacura Chief, Office of Asphalt Pavement Pavement Program California Asphalt Pavement Association Fall Conference October 24, 2013
  2. 2. PRESENTATION OVERVIEW • • • • • Pavement Selection Testing Design (CalME) Performance Specifications Lessons Learned
  3. 3. Pavement Project Selection • Identify location with long life in mind • Rehabilitation projects • Life Cycle Costs/Scoping Document • Program project for SHOPP Cycle
  4. 4. Testing • As-builts of existing roadway • Verify with coring and GPR • Identify possible binder and aggregate sources for testing • Preliminary shear/fatigue testing
  5. 5. Design (CalME) • Mechanistic Empirical approach • Design for over 40 years • Building materials library • Based on Shear and Fatigue testing • Establish Performance Requirements
  6. 6. Performance Specifications • Based on Shear, Fatigue, Stiffness • Meet certain levels of repetitions • Beyond standard mix design • Investigating Asphalt Material Performance Tester (AMPT)
  7. 7. MIX DESIGN BASED ON ‘MECHANISTIC/PERFORMANCE’ LAB TESTING • Hveem (CT 366) • Shear Testing (T 320) • Fatigue Testing (T 321) • Hamburg WT (T 324)
  8. 8. LESSONS LEARNED • New to industry  Complex data analysis and presentation  Currently looking at ways to simplify process • Present test results more straight forward manner • Availability of testing labs • Testing time
  9. 9. LESSONS LEARNED • • Pre-bid conference for potential bidders very beneficial Partnering Meeting used to ensure an understanding by the contractor and testing laboratory of the performance test procedures
  10. 10. LESSONS LEARNED • • • Anticipate the need for multiple mix designs/iterations. Schedule mix design and testing as soon as possible Ensure sufficient testing capacity is available
  11. 11. LOOKING FORWARD • • • • Reevaluate performance requirements (shear, fatigue) Building of Materials Library Investigate AMPT as an alternate to the shear tester (AASHTO T-320) Pre-award qualification of mix design(s)
  12. 12. Thank you

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