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Asphalt Issues AASHTO SCOC Virginia Beach, Va.

Asphalt Issues AASHTO SCOC Virginia Beach, Va. By Victor (Lee) Gallivan FHWA August 2, 2011. HMA Topics for the Day. Reclaimed Asphalt Pavement (RAP) Updated Thin 4.75 mm surface mixture Construction Specifications for IC. Recycled Materials Survey.

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Asphalt Issues AASHTO SCOC Virginia Beach, Va.

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  1. Asphalt IssuesAASHTO SCOCVirginia Beach, Va. By Victor (Lee) Gallivan FHWA August 2, 2011

  2. HMA Topics for the Day • Reclaimed Asphalt Pavement (RAP) • Updated Thin 4.75 mm surface mixture • Construction Specifications for IC

  3. Recycled Materials Survey • Conducted through AASHTO SOM List Serve. • Sent end of December 2010. • Various questions related to RAP, RAS, RCA. • 45 state responses plus West Federal Lands and Ontario. • Some data used is from 2007/2008 survey due to lack of responses.

  4. Survey (cont) • Main Survey Questions • Allowance of recycled materials (RAP, RAS, RCA) per specifications? • Contractors actual usage of recycled materials? • Special testing/handling procedures? • Research needs, major concerns/obstacles for increased usage of recycled materials?

  5. RAP Survey • Items of note from survey… • RAP Availability – contractor/DOT ownership? • WMA - Increased usage during DOT implementation? • Stockpiles - Fractionation, captive stockpiles becoming more prevalent?

  6. RAP Survey (cont) • Research Needs: • Needed dwell time for mixing? • Mix performance tests (long-term durability, thermal cracking, f/t resistance). • Binders - bumping, blending, stiffness/cracking, interaction with polymers. • Determining RAP binder properties. • Skid resistance.

  7. Since 2007/2008 Survey… • RAP % allowed by percentage has stayed pretty consistent for DOT’s. • For RAP utilization by contractors, it appears the 20-30% usage has increased the most with all other percentages staying pretty much the same.

  8. RAS Survey • Items of note from survey… • Sources – pre/post consumer supply (about 50/50). • Special Requirements – gradations, asbestos testing.

  9. RAS Survey(cont) • Research Needs • % binder contribution • Mix performance testing • Binder bumping, blending • Fatigue and low temperature cracking • Use in WMA? • Use of rejuvenators • Binder impacts

  10. HMA Topics for the Day • Reclaimed Asphalt Pavement (RAP) • Updated Thin 4.75 mm surface mixture • Construction Specifications for IC

  11. Thin Lift 4.75 mm HMA Mix • AASHTO M 323 Revisions • Gradation • Lay thickness • Acceptance (no cores)

  12. Intelligent Compaction

  13. FHWA Generic IC Spec Subbase Soils HMA

  14. Soils IC vs. HMA IC • Soils IC • Moistures • Acceptance • HMA IC • Temperatures • Acceptance

  15. Components of Standards • Approval of IC Equipment • IC Data Requirements • Quality Control Plan • GPS/Datum Requirements • Test Sections and Target Values • QC/QA for Production Areas • IC Data Submittal • Payment and Measurements

  16. 1. Approval of IC Equipments • Continuous Measurement System • RTK GPS • Onboard Reporting System

  17. Compatible with Standardized IC Software (Veda) Headers Manufacturer Machine Type Machine Model Drum Width Drum Diameter UTM Zone….. Data Blocks Date/time stamp Long/Lat Easting/Northing Pass Counts Speed Frequency Amplitude Temperatures IC Measurement Values 2. IC Data Requirements

  18. IC Analysis with Veda

  19. 3. Quality Control Plan • Contract-Specific Quality Control Plan (QCP) • Signed by Contractors • Accepted by DOTs • Implementation of QCP • QCP Field Manager • Quality Control Technician

  20. 4. GPS/Datum Requirements • Datum Designation/Conversion • GPS Checks

  21. GPS Checks

  22. 5. Test Sections/Target Values • Dimension of Test Sections • E.g., 75 m X 6 m for soils • Evaluation for Each Lift Materials • Fixed Settings of IC Compaction • Determination of Target Roller Passes and IC-MV

  23. QC Target Values Target ICMV DICMV<5% Optimal pass

  24. QA Target Values Target ICMV ICMV Target % Gmm % Gmm

  25. 6. QC/QA for Production Areas • Mapping of Existing Support • QC for Production Compaction • Coverage • Percent Requirements Meeting Target Values • Acceptance for Production Compaction • Based on Agency’s Current Requirements

  26. Statistics of IC-MV

  27. 7. IC Data Submittal • Daily Data Submittal • Native IC Data • Exported IC Data • All Passes Data • Proof Data

  28. Courtesy of Bomag

  29. All Passes and Proof IC Data Courtesy of Sakai

  30. 8. Payment and Measurements • Lump Sum Payment • Itemized Payment • Weekly IC Equipment Rental • Hourly Rate for Roller Operator • Measurement • No. of calendar weeks roller furnished • Unauthorized Work • Compacted materials are unauthorized without QC data

  31. Keys to Success • Passion • IC Champions within Agencies • Patience • It Takes Time! • Communications • Among Agency, Suppliers, Contractors, and Consultants • Strategies • Start with Low-Hanging Fruits

  32. Thank You ! Lee Gallivan, P.E. HQ-Office of Pavement Technology Asphalt Pavement Engineer Victor.gallivan@dot.gov

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