Kamil E. Kaloush, Ph.D., P.E.

1
Asphalt Rubber Research Briefing

• Kamil E. Kaloush, Ph.D., P.E.
• October 20, 2003

2
Research Activities

• AR Materials
• Binder Tests
• Mix Mechanical Tests
• Urban Heat Island Effect
• Pavements / Surface Type
• Tire / Pavement Surface Interaction
• Noise Characteristics
• CR Particles from Tire Wear

3
AR Materials Studies

• Completed
• I-40 Buffalo Range (Flagstaff) - 2002
• Edmonton, Alberta - 2003
• On-Going
• Asphalt Rubber Demonstration Program (Phoenix)
  2003 / 2004
• Maricopa County (Wet, Dry Vestenamer) - 2003
• New
• Flagstaff-Holbrook Hwy (3 mixes SHRP, ARAC, ACFC)
  - 2004

4
Materials AR Studies

• Under Scheduling
• Kohls Ranch Hwy (3 mixes SHRP, ARAC, ACFC)
  2004 / 2005
• Additional Test Sections, Alberta - 2004
• Wish List
• ALF Mixes
• New Mexico Ford Study

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MATERIAL CHARACTERIZATION OF ASPHALT RUBBER
MIXTURES USING THE DYNAMIC MODULUS TEST
M.S. Thesis

• Andres Sotil
• May 16, 2003

6
Scope of Thesis

• Sensitivity of Air Voids, Binder Type, and
  Confinement Level on E Tests
• Comparison between AR and Conventional Mixtures
• Assess Applicability of Witczak E Predictive
  Equation on AR Mixtures
• Develop Methods to Predict Confined E Test
  Results

7
Mixture and Tests Conditions
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Mixture Tests
9
Field Mixes
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What are the Findings?

• Binder Tests Viscosity-Temperature
  Susceptibility of Crumb Rubber Modified Binders.
• Mixture Tests Indicative of Observed Field
  Performance.
• Less Low-Temperature Cracking
• Good Resistance to Deformation at High
  Temperatures.

11
Binder Comparison
12
Rankings at 10 oC, 10Hz
13
Rankings at 38oC, 10 Hz
14
Gap Open Dense Graded
15
Summary Alberta Study
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Thank you !