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Asphalt Specification Changes July 2005

Asphalt Specification Changes July 2005. Contractor Asphalt Training Rich Hewitt, PE District Bituminous Engineer District Five Materials & Research. Asphalt Specification Changes July 2005. What are we going to talk about? Background & General Information

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Asphalt Specification Changes July 2005

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  1. Asphalt Specification Changes July 2005 Contractor Asphalt Training Rich Hewitt, PE District Bituminous Engineer District Five Materials & Research

  2. Asphalt Specification Changes July 2005 • What are we going to talk about? • Background & General Information • Specifics on 334 Changes…a bunch! • Specifics on 337 Changes…a few! • Specifics on 234 Changes…one slide! • Questions & Discussion

  3. Asphalt Specification Changes July 2005 • CQC Asphalt Specification Task Team • Industry, FHWA, FDOT • Fall 2004 • Statistical evaluation of data • Review significant changes to… • 334 Superpave Asphalt Concrete • 337 Asphalt Concrete Friction Courses • 234 Superpave Asphalt Base

  4. Asphalt Specification Changes Section 334 • General reorganization: • 334-1 Description • 334-2 Materials • 334-3 General Composition of Mixture • 334-4 Contractor Process Control • 334-5 Acceptance of the Mixture • 334-6 Comparison Testing • 334-7 Method of Measurement • 334-8 Basis of Payment

  5. Asphalt Specification Changes Section 334 • 334-5 Acceptance of the Mixture • 334-5.1 General • 334-5.2 Lot Sizes • 334-5.3 Initial Production Requirements • 334-5.4 Quality Control Sampling and Testing • 334-5.5 Verification Testing • 334-5.6 Resolution System • 334-5.7 Independent Sample Verification Testing • 334-5.8 Surface Tolerance • 334-5.9 Minimum Acceptable Quality Levels

  6. Asphalt Specification Changes Section 334 • 334-1.4 Thickness • Specify thickness instead of spread rate • Old: 200 lbs/yd2 • New: 2 inches • Control based on spread rate • Convert thickness to spread rate: • Spread rate (lbs/yd2) = t x Gmm x 43.3 • Plan quantities based on Gmm of 2.540 • Approximately 110 lbs/yd2 – granite mix

  7. Asphalt Specification Changes Section 334 • 334-1.4.Thickness • Fine Mixes (Nearest ½ inch) • Type SP-9.5 1 – 1½ inches • Type SP-12.5 1½ - 2½ inches • Type SP-19.0 2 - 3 inches • Permits two layers of SP-9.5 (fine) • Stacking • Can’t use SP-9.5 (fine) on Traffic Level D & E

  8. Asphalt Specification Changes Section 334 • 334-1.4.Thickness • Coarse Mixes (Nearest ½ inch) • Type SP-9.5 1½ - 2 inches • Type SP-12.5 2 - 3 inches • Type SP-19.0 3 - 3 ½ inches

  9. Asphalt Specification Changes Section 334 • 334-2.2 Superpave Asphalt Binder: • PG 67-22 – Standard Binder Grade • Traffic Level D – PG 76-22 top structural layer • PG 76-22 is polymer modified • Traffic Level E – PG 76-22 top two structural layers • 334-3.2 Mix Design: • 3 mix designs/NMAS/traffic level/binder grade/contract year • Coarse and fine allowed for all Traffic Levels

  10. Asphalt Specification Changes Section 334 • 334-4 Process Control • Address in QC Plan how PC failures will be handled • Basically need to address problem, then resample • Second failure stop production, contact Engineer • 334-5.1.2 Acceptance Testing Exceptions: • Less than 500 tons of any mix type, visual inspection • Engineer may require PC tests or IV tests

  11. Asphalt Specification Changes Section 334 • 334-5.2 Lot Sizes • If a Lot is terminated on QC failure, Lot sizes go to 2000 tons • Partial Lots will not be redefined • 334-5.4.4 Individual Test Tolerances for Quality Control Testing: • Revised Master Production Range

  12. Asphalt Specification Changes Section 334

  13. Asphalt Specification Changes Section 334 • 334-5.4.4 Individual Test Tolerances for Quality Control Testing: • Added single density value < 91.00% • Coarse mixes • Single low density value – correct problem • Two in same sublot - stop • Any Lot terminated on QC failure is limited to a maximum pay factor of 1.00 per characteristic • 334-5.5 Verification Testing: • Single non-comparison → Resolution

  14. Asphalt Specification Changes Section 334 • 334-5.6.3 Resolution Determination: • No additional time granted • 334-5.9.5 Defective Material: • “Cleaned up” • Better describes actual process • Allows delineation testing

  15. Asphalt Specification Changes Section 334 • 334-8.2 Pay Factors: • Modified Small Quantity Pay Table • Modified PWL Spec Limits

  16. Asphalt Specification ChangesSection 337Asphalt Concrete Friction Courses • 337-2.2 Asphalt Binder: • Use PG 76-22 when called for in Contract, otherwise ARB • 337-6.2.1 Individual Test Tolerances for FC-5 Production: • Single binder content out = stop • Two out on gradation = stop • Address IAW “Defective Material” Note: 334-9.4 no longer exists, 334-5.9.5 was intended.

  17. Asphalt Specification Changes Section 337 • 337-8 Thickness of Friction Courses • FC-9.5 & FC-12.5: use 334-1.4 • Spread rate (lbs/yd2) = t x Gmm x 43.3 • FC-5: • Spread rate (lbs/yd2) = t x Gsb x 40.5 • Gsb= combined aggregate bulk specific gravity of the verified mix design • Plan quantities based on Gsb of 2.635 • Spread rate of 80 lbs/yd2 • 337-9.3 Hydrated Lime Pretreatment: • Allow lime pretreated aggregate • 45-day window for use after pretreatment • Spec addresses QC and certification requirements for blending operations

  18. Asphalt Specification ChangesSection 234 Superpave Asphalt Base • 234-8 Thickness Requirements. • Convert thickness to spread rate: • Spread rate (lbs/yd2) = t x Gmm x 43.3

  19. Questions?

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