Date post: | 27-Mar-2015 |
Category: |
Documents |
Upload: | jada-medina |
View: | 215 times |
Download: | 0 times |
WMAWMAKenneth Ray Hobson, P.E.
Bituminous Engineer
OverviewOverview
• State Perspective
• Qualified Sources
• Specifications
• Lab Sampling & Testing
• Review
• Acronyms
State PerspectiveState Perspective
• Improve Quality– Air Emissions– Density– Longevity
• Decrease Cost– Burner Fuel Savings
• Implementation
Qualified SourcesQualified Sources
• Approved Technologies:http://v.gd/nBTKiI
–Foaming–Chemical–Organic
Qualified SourcesQualified Sources
SpecificationsSpecifications
• WMA Special Provisions– 411-13 http://v.gd/ljMfSQ
• Behind Paver Min. 215°F [102°C]• HMA - 250°F [121°C]
– 708-22 http://v.gd/ohpb4Y• Reheat from 100°F [38°C]• Heat 4 hours at 300°F [149°C]
– AASHTO T 283 Moisture Sensitivity– OHD L-55 Hamburg Rut Test
SpecificationsSpecifications
• Roadway Compaction Temperature Trends– WMA Chemical 230°F– WMA Foaming 260°F– HMA w/ PG 64-22: 290°F– HMA w/ PG 70-28: 305°F– HMA w/ PG 76-28: 305°F
SpecificationsSpecifications
• Designs http://v.gd/eWi4Vg
SpecificationsSpecifications
Lab Sampling & TestingLab Sampling & Testing
• Similar to HMA except for Reheat
• WMA Chemical & Organic Technologies– Lab Compaction Temperatures Vary
Automatic Marshall Hammers
Superpave Gyratory Compactor (SGC)
ReviewReview
• State Perspective– Improve Quality– Decrease Cost– Implementation• Qualified Sources - http://v.gd/nBTKiI
ReviewReview
• Specifications– 411-13 http://v.gd/ljMfSQ– 708-22 http://v.gd/ohpb4Y
• Lab Sampling & Testing– Similar to HMA except for Reheat– WMA Chemical & Organic Technologies
• Lab Compaction Temperatures Vary
AcronymsAcronyms
• Ndes – Number of SGC Gyrations at JMF Binder
• Nini – Number of SGC Gyrations backcalculated from Ndes Specimens– Density Similar to That Behind Paver
• Nmax – Number of SGC Gyrations at End of Pavement Life (mix design only)
AcronymsAcronyms
• WMA – Warm-Mix Asphalt
• HMA – Hot-Mix Asphalt
• RAP – Recycled Asphalt Pavement
• RAS – Recycled Asphalt Shingles
• ODOT – Oklahoma Department of Transportation
• ASA – Anti-Strip Additive