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

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Presentation on theme: "WMA Kenneth Ray Hobson, P.E. Bituminous Engineer."— Presentation transcript:

1 WMA Kenneth Ray Hobson, P.E. Bituminous Engineer

2 Overview State Perspective Qualified Sources Specifications Lab Sampling & Testing Review Acronyms

3 State Perspective Improve Quality –Air Emissions –Density –Longevity Decrease Cost –Burner Fuel Savings Implementation

4 Qualified Sources Approved Technologies: –Foaming –Chemical –Organic

5 Qualified Sources

6 Specifications WMA Special Provisions –411-13http://v.gd/ljMfSQ411-13http://v.gd/ljMfSQ Behind Paver Min. 215°F [102°C] HMA - 250°F [121°C] –708-22http://v.gd/ohpb4Y708-22http://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

7 Specifications 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

8 Specifications Designs

9 Specifications

10 Lab Sampling & Testing Similar to HMA except for Reheat WMA Chemical & Organic Technologies –Lab Compaction Temperatures Vary

11

12 Automatic Marshall Hammers

13 Superpave Gyratory Compactor (SGC)

14 Review State Perspective –Improve Quality –Decrease Cost –Implementation Qualified Sources -

15 Review Specifications –411-13http://v.gd/ljMfSQ411-13http://v.gd/ljMfSQ –708-22http://v.gd/ohpb4Y708-22http://v.gd/ohpb4Y Lab Sampling & Testing –Similar to HMA except for Reheat –WMA Chemical & Organic Technologies Lab Compaction Temperatures Vary

16 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)

17 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


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