1. www.transportation.ohio.gov John R. Kasich, GovernorJerry Wray, Director Ohio Department of Transportation 2010 Pavement TPR Review

2. www.transportation.ohio.gov 2 Notes from 2010 Construction Season 2011 conaway conference Warm Mix Asphalt Field Quality Control Supervisor Tack

3. www.transportation.ohio.gov 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. www.transportation.ohio.gov 4 Warm Mix Asphalt – Why use it? 2011 Conaway Conference Less stack emissions ◦ Air pollution concerns with greenhouse gasses (CO, CO 2, NO x, SO 2 ) Less binder aging ◦ Prematurely aging asphalt using high production temps Easier Compaction at Lower Mix Temps ◦ Decreased viscosity of binder means ease of compaction

5. www.transportation.ohio.gov 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. www.transportation.ohio.gov 6 Bleeding/Flushing of Binder 2011 Conaway Conference

7. www.transportation.ohio.gov 7 Bleeding/Flushing of Binder 2011 Conaway Conference

8. www.transportation.ohio.gov 8 Bleeding/Flushing of Binder 2011 Conaway Conference

9. www.transportation.ohio.gov 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. www.transportation.ohio.gov 10 THIS? OR THIS? Field Quality Control Supervisor 2011 Conaway Conference

11. www.transportation.ohio.gov 11 THIS? OR THIS? Field Quality Control Supervisor 2011 Conaway Conference

12. www.transportation.ohio.gov 12 THIS?OR THIS? Field Quality Control Supervisor 2011 Conaway Conference

13. www.transportation.ohio.gov 13 THIS? OR THIS? Field Quality Control Supervisor 2011 Conaway Conference

14. www.transportation.ohio.gov 14 Tack Redux Seeing improvement But lest we forget…. 2011 Conaway Conference

15. www.transportation.ohio.gov 15 Tack Redux 2011 Conaway Conference

16. www.transportation.ohio.gov 16 Thanks – see you in the field 2011 Conaway Conference