Your SlideShare is downloading. ×
Joe Peterson
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Introducing the official SlideShare app

Stunning, full-screen experience for iPhone and Android

Text the download link to your phone

Standard text messaging rates apply

Joe Peterson

309
views

Published on

Presentation by Joe Peterson of Caltrans on the Caltrans move to "Superpave" delivered at the CalAPA Fall Asphalt Pavement Conference Oct. 24, 2013 in Sacramento, Calif.

Presentation by Joe Peterson of Caltrans on the Caltrans move to "Superpave" delivered at the CalAPA Fall Asphalt Pavement Conference Oct. 24, 2013 in Sacramento, Calif.

Published in: Business, Technology

0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
309
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
18
Comments
0
Likes
1
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. California’s Transition Hveem To Superpave
  • 2. Trivia
  • 3. Pilot Projects 6 Projects Completed 13 Projects in Construction 14 Approved Mix Designs Placed over 100,000 tons of HMA-SP (Type A) and RHMA-SP-G • Superpave HMA has been placed in high traffic areas such as LA-405, and low volume country roads, all with great success. • • • • o
  • 4. Studies • University of California Pavement Research Study • Completed: December 2012 • Looked at 15 Existing Hveem JMF’s from around the State • Study showed all 15 mix designs with some adjustments in OBC , grading and dust proportion would meet the Superpave specification. • Report is available at: o http://www.dot.ca.gov/hq/esc/Translab/ormt/superpave/index.htm
  • 5. Superpave Methodology AASHTO M 323 Volumetric requirements AASHTO R 35 Mix Design evaluation AASHTO R 30 Mixture Conditioning AASHTO T 312 SGC Mixture Compaction AASHTO T 324 Hamburg Test AASHTO T 283 Moisture Sensitivity SP 2 SUPERPAVE Mix Design Handbook Volumetrics Air Voids, VMA, VFA Job Mix Formula
  • 6. Basis for Design • Gyrations Compaction Type A Ninitial Ndesign Nmax • 8 85 AASHTO T 312 RHMA-G 130 Air Voids Type A Ninitial Ndesign Nmax >8.0% =4.0% >2.0% Ndesign =50-150 AASHTO T 269 RHMA-G Ndesign=Specifications
  • 7. Design Volumetrics Asphalt Institute SP-2 HMA Type A-SP • VMA o o o o 1/4” grading 3/8” grading 1/2” grading 3/4” grading 18.0 (-1.0, +3.0) 16.0 (-1.0, +3.0) 14.5 (-1.0, +3.0) 13.5 (-1.0, +3.0) • DP o 1/4” & 3/8” grading o 1/2” & 3/4” grading o 1” grading 0.6-1.3 0.6-1.3 0.6-1.3
  • 8. DesignVolumetrics Asphalt Institute SP-2 RHMA G-SP • VMA o 1/2” grading o 3/4” grading 19.0-24.0 19.0-24.0 • DP o All grading’s Report Only
  • 9. Hamburg Wheel Tracker AASHTO T324 Testing Temperatures o PG 58 o PG 64 o PG 70 + 45 degrees C 50 degrees C 55 degrees C
  • 10. Hamburg Wheel Tracker AASHTO T324 HMA Type A-SP • Maximum 1/2” Rutting o o o o PG 58 PG 64 PG 70 PG 76 (+) 10,000 passes 15,000 passes 20,000 passes 25,000 passes • Inflection point o o o o PG 58 PG 64 PG 70 PG 76 (+) 10,000 passes 10,000 passes 12,500 passes 15,000 passes
  • 11. Hamburg Wheel Tracker AASHTO T324 RHMAG-SP • Maximum 1/2” Rutting o PG 58 o PG 64 o PG 70 15,000 passes 20,000 passes 25,000 passes • Inflection point o PG 58 o PG 64 o PG 70 10,000 passes 10,000 passes 12,500 passes
  • 12. Inflection Point Defined
  • 13. Moisture Sensitivity AASHTO T283 HMA Type A-SP & RHMA-G-SP • Minimum Dry Strength Break o 100 psi 4” or 6” sample (gyratory) • Minimum Wet Strength Break o 70 psi 4” or 6” sample (gyratory) • Ratio is no longer measured • Testing done on plant produced material
  • 14. CRUSHED/FRACTURED FACES AASHTO T335* • Percent of crushed particles Coarse aggregate (% min.) One fractured face Two fractured faces Fine aggregate (% min) (Passing No. 4 sieve and retained on No. 8 sieve. *Crushed Type A RHMA 95 90 --90 70 70 Face defined as 50% of projected face
  • 15. RAP Utilization • JMF Design: RAP o 0% to 25% o RAP fractionated into: • + #3/8” Sieve • - #3/8” Sieve o Allowable stockpile variance, binder content: +/-2.0% o Rice Specific Gravity • Allowable stockpile variance Gmm= +/-0.060
  • 16. Binder Content/Air Voids Plant Produced Material • Asphalt Binder Content % HMA Type A-SP - 0.30, +0.5 RHMA G-SP - 0.40, +0.5 • Air Voids Content % HMA Type A-SP 4 +/- 1.5 RHMA G-SP Specification +/- 1.5 *Bulk SPG by Weigh wax weigh
  • 17. Production QC and QA • • • • • • • Aggregate Quality Aggregate Grading Binder Content HMA Moisture VMA, DP, & Air voids Hamburg Wheel Tracker Moisture Susceptibility
  • 18. Density QC • Percent of theoretical maximum density by Nuclear gauge (%) HMA Type A-SP 92 – 97 Verify gauge correlation to cores every 10,000 tons utilizing the average of 2 cores RHMA G-SP 92 – 97
  • 19. Density QC • Percent of theoretical maximum density by core o 2 per paving day HMA Type A-SP 92 – 97 Verify gauge correlation to cores every 10,000 tons utilizing the average of 2 cores RHMA G-SP 92 – 97
  • 20. Minor Hot Mix Asphalt • 1000 tons or less total production for: o Caltrans Projects o Projects within State Right-A-Way • Requires a JMF submittal • Mandatory use of liquid antistrip • Requires a production start up evaluation • Requires quality control testing
  • 21. Minor Hot Mix Asphalt • Verification is done on laboratory produced material (No hot drop) • Verifications times remain the same • AASHTO T 324 does not apply • AASHTO T 283 does not apply • CT 204 does not apply • FAA and F&E do not apply
  • 22. Minor Hot Mix Asphalt • Verification consists of testing for: o Aggregate quality o Aggregate gradation o Asphalt binder content o Air Voids o VMA
  • 23. Minor Hot Mix Asphalt • QC testing consists of: o Aggregate gradation o Asphalt binder content o Air Voids o VMA o Density by Nuclear gage (if applicable)
  • 24. Minor Hot Mix Asphalt • QA consists of testing for: o Aggregate gradation o Asphalt binder content o Air Voids o VMA
  • 25. Mix Design QA Quality HMA QC sampling