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2010 Pavement TPR Review

2010 Pavement TPR Review . Notes from 2010 Construction Season. Warm Mix Asphalt Field Quality Control Supervisor Tack . Warm Mix Asphalt – What is it?. Asphalt concrete Uses an “additive”* to decrease binder viscosity Produced at lower production temps Compacts at lower mix temps

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2010 Pavement TPR Review

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  1. 2010 Pavement TPR Review

  2. Notes from 2010 Construction Season • Warm Mix Asphalt • Field Quality Control Supervisor • Tack 2011 conaway conference

  3. Warm Mix Asphalt – What is it? Asphalt concrete Uses an “additive”* to decrease binder viscosity Produced at lower production temps Compacts at lower mix temps *ODOT uses water injection method only (~2% by binder weight/1.5% vaporizes 2011 conaway conference

  4. Warm Mix Asphalt – Why use it? Less stack emissions • Air pollution concerns with greenhouse gasses (CO, CO2, NOx, SO2) Less binder aging • Prematurely aging asphalt using high production temps Easier Compaction at Lower Mix Temps • Decreased viscosity of binder means ease of compaction 2011 Conaway Conference

  5. Warm Mix Asphalt - How are we doing? • Long term durability unknown • Current spec in use since 1/16/09 • Many contractors using • ~35% of asphalt was WMA in 2010 • Some field issues • Overcompaction • Bleeding/flushing of binder 2011 Conaway Conference

  6. Bleeding/Flushing of Binder 2011 Conaway Conference

  7. Bleeding/Flushing of Binder 2011 Conaway Conference

  8. Bleeding/Flushing of Binder 2011 Conaway Conference

  9. Field Quality Control Supervisor Part of contractor QC for asphalt Contract requirement Contractor expected to make changes to fix the problem 2011 Conaway Conference

  10. Field Quality Control Supervisor THIS? OR THIS? 2011 Conaway Conference

  11. Field Quality Control Supervisor THIS? OR THIS? 2011 Conaway Conference

  12. Field Quality Control Supervisor OR THIS? THIS? 2011 Conaway Conference

  13. Field Quality Control Supervisor THIS? OR THIS? 2011 Conaway Conference

  14. Tack Redux Seeing improvement But lest we forget…. 2011 Conaway Conference

  15. Tack Redux 2011 Conaway Conference

  16. Thanks – see you in the field 2011 Conaway Conference

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