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Specification Update

Specification Update

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Specification Update

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  1. Specification Update Curtis Vincent, P.E. Construction Engineer Lyndi Davis Blackburn, P.E. Assistant Materials and Tests Engineer

  2. General Application Special Provision • 12-0263(3) • Section 106 • Section 410 • Section 420 • Section 423 • Section 424

  3. Section 106 • Item 106.09(c)6 • Subarticle106.09(a) • Pay Factors will not be applied to mixes where the roadway density requirement has been lowered below 94%. • Correction of AASHTO Standard Reference from TP 71 to T 344.

  4. Section 410 • Article 410.01 • Item 410.02(e)2 Defined Surface Layers Changed Allowable RAP & RAS usage.

  5. Allowable Use of RAP & RAS

  6. Section 410 • Article 410.01 • Item 410.02(e)2 • Item 410.02(e)4 • Previously Item 410.02(e)5 • Defined Surface Layers • Changed Allowable RAP & RAS usage. • Added RAS stockpile requirements. • Deleted Additional Testing Requirements for Recycled/Reclaimed mixes over 25%

  7. Section 410 (Continued) • Subarticle 410.02(f) • New Item 410.02(f)4 • Added RAS as a fiber stabilizer • Added Synthetic fibers

  8. Slide on RAS and Synthetic Fiber (f) LIQUID ASPHALT BINDER DRAINDOWN. 1. FIBER STABILIZER. A fiber stabilizer is required for some mix types (Section 420, 423, etc). A fiber stabilizer may be used on other mix types where asphalt binder cement draindown is a problem. Where RAS is included in the JMF, fiber stabilizer shall not be required provided the draindown requirements of 0.30% or less are met when tested in accordance with AASHTO T305 at 325°F {163°C} and 350°F {176°C}.

  9. Slide on RAS and Synthetic Fiber 4. SYNTHETIC FIBERS. Synthetic fibers shall include but are not limited to one or a combination of the following: polyolefins (such as polyethylene and polypropylene) and aramids (such as Kevlar, Twaron and Nomex). Fibers shall be twisted fibrillated, flat fibrillated or monofilament with a maximum fiber length of 0.75 inches {19 mm}

  10. Section 410 (Continued) • Subarticle 410.02(f) • New Item 410.02(f)4 • Item 410.03(c)3 • Added RAS as a fiber stabilizer • Added Synthetic fibers • Added in Density Requirement when the leveling layer meets minimum rate requirements.

  11. Item 410.03(c)3. Leveling Leveling shall be compacted to meet the density requirements given in Article 410.04 if the minimum required placement rate shown on the plans is equal to or greater than the placement rate given in the following table for the maximum size aggregate in the mix. Compaction shall be to the satisfaction of the Engineer if the placement rate shown on the plans is less than the placement rate shown in the following table.

  12. Item 410.03(c)3. Leveling

  13. Section 420 - OGFC • Subarticle 420.02(e) • Allows CQS-1hp Asphalt Emulsion with the Spray Paver equipment or “PG Asphalt for Trackless Tack with Conventional Paver equipment.

  14. Section 423 & Section 424 • For Any Mixes Containing RAS • Minimum Liquid Asphalt Binder is increased by 0.2 • Air Voids will be designed on 3.5%.

  15. Other Stuff Every Day Counts Intelligent Compaction – at least two pilot projects. Inertial Profiler – Smoothness Testing Have 3 pilot projects underway.

  16. Questions? Lyndi Blackburn 334-206-2203 blackburnl@dot.state.al.us

  17. Asphalt Pavement • Specifications Detailed Technical Lengthy Complicated

  18. Asphalt Pavement • Common Sense Right vs. Wrong • Workmanship Pleasing to the eye Looks bad ----- Is Bad

  19. Process

  20. Industry Impacts • ATRIP = $1,000,000,000 Program Approximately 1100 projects received some amount of funding Approximately 750 of those are system preservation/ roadway improvements • Annual resurfacing program = $250,000,000 • Large portion of remaining budget is roadway related

  21. Construction Quality?

  22. Construction Quality • The Obvious

  23. Construction Quality?

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  27. Construction Quality?

  28. Construction Quality?

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  30. Construction Quality?

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  32. Construction Quality?

  33. Questions?