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The Past 50 Years of Asphalt Liquid Asphalts

By: Jim McGraw, Dan Wegman, and Mihai Marasteanu. The Past 50 Years of Asphalt Liquid Asphalts. Simplified Asphalt Options. Naphtha or Kerosene. ASPHALT. Cutbacks. Straight Run Asphalt. Blown Asphalt. Asphalt blower. Hot Air. Emulsions. Water & Emulsifier. Asphalt Cement.

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The Past 50 Years of Asphalt Liquid Asphalts

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  1. By: Jim McGraw, Dan Wegman, and Mihai Marasteanu The Past 50 Years of AsphaltLiquid Asphalts

  2. Simplified Asphalt Options Naphtha or Kerosene ASPHALT Cutbacks Straight Run Asphalt Blown Asphalt Asphalt blower Hot Air Emulsions Water & Emulsifier

  3. Asphalt Cement • Asphalts originally “penetration graded” • Penetration at 25°C (77°F) “ambient temperature” • Softer (higher pen) - colder climates • Harder (lower pen) - hotter climates • 85/100, 120/150, 200/300 0 sec 5 sec penetration 100 g 100 g

  4. Penetration Test • Stiffness @ 77 o F • Empirical • No information at high and low temperatures • Same Pen – Different Field Performance

  5. SuperPave Binder Tests-1997 • PG Grading system based on: • Climate (Temperatures in ºC) • Engineering Properties • Traffic speed and load (Grade “Bumping”) • PG 70-28 (158-18°F) (high & low pavement temp)

  6. Pre- SuperPave Testing Equipment Penetration Ductility Viscosity

  7. SuperPave Binder Tests Climate Modulus Creep Stress Strain

  8. Asphalt Certification • Test every load • 1995- Certified Sources-Comparison Testing • 1997-Tri-State • 1998-Combined State Binder Group • MN,WI,IA,MI,ND,SD and Neb

  9. Liquid Asphalt Spec Timeline 1947 • AC-1 Paving • AC-2 Brick Filler • AC-3 Crack Filler • Penetration specified in plans • Penetration,Ductility,5 hour mass loss and spot test

  10. Liquid Asphalt Specifications1947 • Rapid Cure Cutbacks-RC0-5 • MC Cutback • Road Tars

  11. 1959 • Emulsions-RS-1,RS-2, MS-2,SS-1 • Powdered Asphalt-crush/grind hard asphalt for surfacing

  12. 1964-1968 • 1964 -Cationic Emulsion-rapid set, high and low viscosity grades • 1968- AASHTO Penetration Grades 85/100, 120-150 & Cutback Grades RC-70, MC-250

  13. 1968- 1983 • 1968-Additional AE requirements for climate • 1968 eliminated Powdered AC • 1972 –Eliminated spot test • 1983-High Float Emulsions

  14. 1988--Present • 1988 eliminated Road Tars • 1997- SuperPave Binder Spec • Polymer Modified Asphalt Binder • 1st SuperPave project- Stearns Co

  15. Lab Field Trip

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