R eclaimed A sphalt P avement in Arizona - Application and Verification

1. Reclaimed Asphalt Pavement in Arizona - Application and Verification October 3, 2008 Arizona Association of County Engineers

2. Outline • Introduction • Project Overview • Existing Pavement Condition • Construction and Production Operations • Granite/ADOT Test Results • Summary

3. Outline • Introduction • Project Overview • Existing Pavement Condition • Construction and Production Operations • Granite/ADOT Test Results • Summary

4. Change in DOT’s

6. Changing Market Conditions = Renewed Interest in Recycling • Price escalation for construction/rehabilitation and maintenance • Asphalt binder shortages • Polymer shortages • Environmental concerns • Energy concerns • Funding limitations

7. States Allowance of RAP • 75-percent of States allow at least 10-percent RAP in surface course mixes • More States allow higher percentages in lower lifts

8. Value of Recycling – Percent Savings Relative to Conventional Materials – Initial Construction* *equivalent square yardsNote: Similar advantages found with Life Cycle Cost

9. PCI Over Time* *Projects constructed in Arizona

10. Outline • Introduction • Project Overview • Existing Pavement Condition • Construction and Production Operations • Granite/ADOT Test Results • Summary

11. Project Layout

12. Standard Sections

13. Scope of Work • Partial depth removal of existing asphalt concrete • Placement of dense grade asphalt concrete • Placement of AR-ACFC • Miscellaneous other work • Granite’s Proposal • Use RAP in base course HMA • 6% coarse RAP (3/4-in x 3/8-in) • 9% fine RAP (3/8-in minus) • Note: RAP currently used as shoulder backing and aggregate base on ADOT projects

14. Standard Section

15. Outline • Introduction • Project Overview • Existing Pavement Condition • Construction and Production Operations • Granite/ADOT Test Results • Summary

16. Alligator Cracking Moderate severity alligator cracking Existing pavement prior to rehabilitation

17. Transverse Cracking Slight to moderate severity transverse cracking Existing pavement prior to rehabilitation

18. Block Cracking Block cracking Existing pavement prior to rehabilitation Maybe considered combination of longitudinal and transverse cracking

19. Outline • Introduction • Project Overview • Existing Pavement Condition • Construction and Production Operations • Granite/ADOT Test Results • Summary

20. Cold Milling Operations

21. Unprocessed RAP from I-19

22. Coarse RAP (3/4-in x 3/8-in)

23. Fine RAP (3/8-in Minus)

24. Hot Plant Feeders 5 Virgin Aggregate Bins 2 RAP Bins

25. Hot Plant Cement Silo and Pugmill Virgin Aggregate Scalping Screen

26. Hot Plant Counter Flow Drum Mixer RAP Conveyor

27. Paving and Inspection HMA Paving Density Testing

28. Rolling Operations Echelon Breakdown Rolling Finish Rolling

29. Finished Mat

30. Outline • Introduction • Project Overview • Existing Pavement Condition • Construction and Production Operations • Granite/ADOT Test Results • Summary

31. Granite Test Results – RAP* *Test results based on ignition oven**Standard Deviation – measure of variability

32. Granite Test Results – RAP* *Test results based on solvent extraction**Standard Deviation – measure of variability

33. Granite/ADOT Test Results - Gradation • Gradation of aggregate extracted from field mixed samples *Standard Deviation – measure of variability

34. Granite/ADOT Test Results - Volumetrics • Volumetric properties of field mixed/lab compacted samples *Standard Deviation – measure of variability

35. Outline • Introduction • Project Overview • Existing Pavement Condition • Construction and Production Operations • Granite/ADOT Test Results • Summary

36. Recycling Benefits • Conservation • Materials (aggregate and asphalt binder) • Energy (burner fuel, trucking, etc.) • Preservation of environment • Landfill • Green house gases (global warming) • Sustainability • Economics • Reduce first and life cycle cost • Complete reconstruction vs. alternative methods • Increased contractor competition

37. Questions