WMA Kenneth Ray Hobson P E Bituminous Engineer

WMA Kenneth Ray Hobson, P. E. Bituminous Engineer

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

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

Qualified Sources • Approved Technologies: http: //v. gd/n. BTKi. I – Foaming – Chemical – Organic

Qualified Sources

Specifications • WMA Special Provisions – 411 -13 http: //v. gd/lj. Mf. SQ • Behind Paver Min. 215°F [102°C] • HMA - 250°F [121°C] – 708 -22 http: //v. gd/ohpb 4 Y • 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

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

Specifications • Designs http: //v. gd/e. Wi 4 Vg

Specifications

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

Automatic Marshall Hammers

Superpave Gyratory Compactor (SGC)

Review • State Perspective – Improve Quality – Decrease Cost – Implementation • Qualified Sources - http: //v. gd/n. BTKi. I

Review • Specifications – 411 -13 – 708 -22 http: //v. gd/lj. Mf. SQ http: //v. gd/ohpb 4 Y • Lab Sampling & Testing – Similar to HMA except for Reheat – WMA Chemical & Organic Technologies • Lab Compaction Temperatures Vary

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)

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