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Pascal Mascarenhas

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Presentation by Pascal Mascarenhas of Vulcan Materials on Reclaimed Asphalt Pavement delivered at the CalAPA Fall Conference held Oct. 24, 2013 in Sacramento, Calif.

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Pascal Mascarenhas

  1. 1. HIGH RAP % IN HMA CALAPA FALL CONFERENCE SACRAMENTO OCTOBER 24, 2013 1
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  3. 3. CITY OF LOS ANGELES 6500 Miles of improved roads  5800 Miles – Asphalt Concrete  Annual Resurfacing budget of $45 million.  3
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  5. 5. CURRENT % RAP ALLOWED  Caltrans – HMA – up to 15% – Superpave – 25% +/-1  Green Book – Section 203-6 – up to 20%  Allows >20% with additional testing and data  City of LA Contract – 50% RAP 5
  6. 6. WHY RECYCLE? Landfill shortage.  August 11,1987 City order prohibiting the landfilling of road materials.  Beneficial Use  Excellent performance  6
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  8. 8. CYCLEAN The process used microwave technology to produce HMA at up to 135 tons/Hr  Plant would consume over 200,000 tons of City RAP in 1992 saving the city $1.5 M in raw material and disposal cost.  8
  9. 9. CITY OF LOS ANGELES Uses own equipment and personnel to mill pavements for profiling and grind-out procedures  Millings transported to two locations for stockpiling  Contract requires the use of COLA millings.  9
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  11. 11. MIX DESIGN PROCESS Extensive profiling of RAP.  Several samples have to be tested.  Extraction and recovery of individual samples.  PG grading of RAP - +PG 82  Blend to PG 64 -10  11
  12. 12. Vulcan Los Angeles Regional Lab Viscosity Testing Extraction/Recovery 12
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  14. 14. Recycling Agents (ASTM D4552) RA1 Viscosity @ 60C (cSt) 50-175 RA5 176-900 RA25 RA75 RA250 RA500 901- 45014500 12500 1250137500 3750160,000 218 218 218 218 218 218 Saturates, %, Minimum 30 30 30 30 30 30 Viscosity Ratio (RTFO or TFO 3 3 3 3 3 Flash Point, C, Minimum 3
  15. 15. Mix Design Procedures Asphalt Content, Aggregate Gradation and PG or RAP  Gradation of New Aggregate  Combined Gradation of Recycled Mix  75 Blow Marshall Mix Design per COLA Brown Book  15
  16. 16. Binder Replacement Binder Replacement +( (A x B)/C ) x 100  A = RAP percent binder content  B = RAP percent in mixture  C = Total percent binder content in mixture.  16
  17. 17. COLA Example A = RAP AC% = 5.4  B = RAP % in mixture = 50  C = Total percent binder in mixture = 5.2   Binder Replacement = 51.9% 17
  18. 18. Testing  Extensive QC Testing – Gradation and AC% on RAP – Gradation on aggregates – PG 64 -10 and Recycling Agent – 75 Blow Marshalls  Extensive QA testing – 4 to 8 samples – 75 Blow Marshalls – Superpave for ARRA jobs 18
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  21. 21. RAP Processing 21
  22. 22. Stockpiling 22
  23. 23. Finished Product ½-inch minus RAP 23
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  28. 28. THANK YOU. 28
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  30. 30. Questions? Pascal Mascarenhas Vulcan Materials mascarenhasp@vmcmail.com 626-856-6190 Phone 626-969-2918 Fax 626-705-6611 Cell 30

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