CALIFORNIA APT PROGRAM UPDATE : 2011 THROUGH 2013

1. CALIFORNIA APT PROGRAM UPDATE:2011 THROUGH 2013 David Jones, John Harvey and Rongzong Wu HVSIA Annual Meeting, San Jose, Costa Rica August 21-23, 2013

2. Summary • Overview of APT in California • Project update since HVSIA 2011 • Planned testing • Future outlook

3. 1993: CAL/APT program established 1995: two HVS Mk3s delivered 2009: new UCPRC facility opened at Davis, CA 2011: new HVS Mk6 delivered 2012: 3 HVSs operating 2013: HVS-1 retired Overview – Major Milestones

4. Overview – Major Milestones

5. Since program start: 21 projects 8 different test sites 82 million load repetitions 4.25 billion ESALs Acknowledgements CSIR UC Berkeley Caltrans Dynatest Overview – Major Milestones

6. Summary • Overview of APT in California • Project update since HVSIA 2011 • SHRP R21, composite pavement • ME Calibration (JH) • R-WMA • Bay Bridge deck joint • Open-graded friction course design • FHWA wide base tire • Full-depth reclamation • Planned testing • Future outlook

7. SHRP II R21 and Caltrans joint funding HMA/PCC new composite pavement Experiment design 60mm and 100mm HMA 125mm and 175mm PCC 2 mixes (rubber & polymer) Doweled/undoweled 4 rutting tests and 9 cracking tests SHRP II R21

8. Key findings Cracking failure mode Reflective cracking over the joints first Fatigue cracking in the underlying PCC slab reflects though the HMA PM performed best in rutting RHMA-G performed best in cracking Effect of RHMA-G thickness: Increase cracking life by 6 times Status Reports available on trb.org SHRP II R21

9. R-WMA-G Study • 3rd Phase of WMA study • 7 WMA technologies/ 2 controls • Produced at 2 different AC plants • Rutting studies with HVS • Fatigue & moisture sensitivity in lab • Emissions study • Field testing of 10 WMA pilot projects in CA continues • Status and implementation • Reports on website • Pilot projects 2007-2011 • Statewide implementation, > 1 m tons placed in 2011 paving season

10. R-WMA-G Study

11. Bay Bridge Study • A new design for seismic expansion joint • 6 week study to determine whether joint can withstand truck traffic • Considered safe and appropriate • Status • Reports on website • Implemented

12. Open-Graded Friction Course • New mix design for OGFC, optimize performance including noise reduction • HVS tests to assess rutting and permeability • Mix design covered two binders and four mix designs • Only one binder used • Status • Reports on website • Recommendations with Caltrans

13. FHWA Wide-Base Tire Study • Joint study between U. Illinois, Florida DOT and UCPRC to assess NGWBT • Measure response on instrumented track, same base, two thickness of AC • 173 different test iterations of 100 repetitions • Dual and NGWB tires • Multiple temperature and loading iterations • Final report in preparation by U. Illinois

14. FDR Study • Objectives • Compare performance of different FDR studies • Assess performance of rubberized AC in FDR mixes • Assess performance of new AC in FDR mixes • Prepare FDR guidelines • ME design criteria • Recycled R-WMA test track • FDR-NS (two AC thicknesses) • FDR-FA • FDR-EE • FDR-PC

15. FDR Study • Progress to date • FDR-NS 60mm • 13mm rut after 490,000 ESALs • No significant loss in stiffness after 750,000 reps • FDR-FA • 4mm rut after 18.2 million ESALs • Some loss in stiffness but still orders of magnitude higher than FDR-NS • No cracks

16. Summary • Overview of APT in California • Project update since HVSIA 2011 • Planned testing • Future outlook

17. Planned Testing • Projects approved, but on hold • High RAP content • Interlayers • Projects approved • ICPI permeable paver study • Planned for November 2013

18. Summary • Overview of APT in California • Project update since HVSIA 2011 • Planned testing • Future outlook

19. Future Outlook • Proposed projects with possible APT component • High RAP/RAS content • Interlayers • FDR continuation (wet tests) • FDR-PC (design + microcracking) • Asphalt/cement hybrid stabilizer • Fully permeable pavements • PCC rubblization vs. crack, seat, overlay

20. Thank-you