WMA

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WMA

• Kenneth Ray Hobson, P.E.
• Bituminous Engineer

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Overview

• State Perspective
• Qualified Sources
• Specifications
• Lab Sampling Testing
• Review
• Acronyms

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State Perspective

• Improve Quality
• Air Emissions
• Density
• Longevity
• Decrease Cost
• Burner Fuel Savings
• Implementation

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Qualified Sources

• Approved Technologies
• http//v.gd/nBTKiI
• Foaming
• Chemical
• Organic

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Qualified Sources
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Specifications

• WMA Special Provisions
• 411-13 http//v.gd/ljMfSQ
• Behind Paver Min. 215F 102C
• HMA - 250F 121C
• 708-22 http//v.gd/ohpb4Y
• Reheat from 100F 38C
• Heat 4 hours at 300F 149C
• AASHTO T 283 Moisture Sensitivity
• OHD L-55 Hamburg Rut Test

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Specifications

• Roadway Compaction Temperature Trends
• WMA Chemical 230F
• WMA Foaming 260F
• HMA w/ PG 64-22 290F
• HMA w/ PG 70-28 305F
• HMA w/ PG 76-28 305F

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Specifications

• Designs http//v.gd/eWi4Vg

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Specifications
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Lab Sampling Testing

• Similar to HMA except for Reheat
• WMA Chemical Organic Technologies
• Lab Compaction Temperatures Vary

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Automatic Marshall Hammers
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Superpave Gyratory Compactor (SGC)
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Review

• State Perspective
• Improve Quality
• Decrease Cost
• Implementation
• Qualified Sources - http//v.gd/nBTKiI

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Review

• 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

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Acronyms

• 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)

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Acronyms

• 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