asphalt rubber blending
TRANSCRIPT
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Asphalt Rubber Blending
By Jack Van Kirk
Director of Asphalt Technology
George Reed Inc.
CalAPA Fall ConferenceOctober 28 - 29, 20015Sacramento, CA
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Asphalt Rubber Binder• How do you produce it?• Quality control?• Binder components?• How do you design it? • How do you test it?• Critical factors?
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Asphalt Rubber Binder• Uses a minimum of 20 +/- 2 % crumb
rubber• Uses 10 mesh (2mm) crumb rubber• Reacts/interacts crumb rubber for a
minimum of 45 min. at elevated temperatures
• Modifies original properties of asphalt cement
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Asphalt Rubber
Conventional or Modified Asphalt
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How is Asphalt Rubber Produced?
• Specialized equipment and binder blended on-site
• High shear blender for mixing crumb rubber with asphalt
• Reaction tank with adequate agitation to assure proper reaction
• All materials are metered-in
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Asphalt Rubber Blending Schematic
Crumb Rubber
Asphalt Storage Tank
Heat TankHigh Speed
Blender
Reaction Vessel
Binder Pumped to Plant
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Rubber Weigh Hopper
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Heater-Blender
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Reaction Vessel
Reaction VesselAugers and
Direct Fire Heating
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Binder Storage Vessel
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Computer Controlled Metering
MPQP Requirements
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High Shear Blender
Computer Controlled
Key is to have proper blending of components
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Chip Seal
Plant Site Set-up
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Quality Control
• Materials sampling and testing
• Field binder testing - hand held viscometer
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Materials Sampling
• Components of the binder must be sampled and tested
• Asphalt rubber binder must be sampled from a point that will provide a representative sample
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Quality Control/Quality Assurance
• QC- testing performed by contractor to ensure production is in control
• QA- testing performed to accept/reject the product
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On-Site Qc for Asphalt Rubber Binder
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Components of the Asphalt Rubber Binder• Crumb rubber modifier (CRM)• Asphalt cement• Asphalt modifier
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Paving Asphalt
• PG 64-16 and PG 58-22 asphalt (80 +/- 2 %) (hot environments PG 70-10)
• Conform to Section 92 “Asphalts” of the Standard Specifications
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Crumb Rubber Modifier (CRM)
• Scrap tire CRM (18 – 22 %)• Max. 0.01 % wire (by wt. Of
CRM)• Max. 0.05 % fabric (by wt. Of
CRM)• It must be a very clean rubber
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Crumb Rubber
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Laboratory Binder Design• Asphalt heated to 400 to 425°F• Asphalt modifier added to asphalt • Crumb rubber blended into asphalt/asphalt
modifier blend• Reacted for a minimum of 45 minutes• Agitated (stirred) frequently during reaction
period• Properties tested over 24 hour period
Compatibility of components
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Binder ProfileTest 45
Minutes
60 Minutes
90 Minutes
120 Minutes
240 Minutes
360 Minutes
1440 Minutes
Viscosity @ 375°F
3600 3450 3100 2800 2200 2000 1800
Cone Penetration @ 77°F
30 34 32
Resilience, % Rebound @ 77°F
51 56 51
Softening Point, °F
166 165 163.5
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Minimum reaction point
Typical Reaction Curve
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Asphalt Rubber Binder Properties
• Cone penetration• Resilience• Field softening point• Viscosity
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Cone Penetration
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Resilience
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Softening Point• Disc of asphalt material is
prepared• Ball bearing placed on top• Placed in water or glycol• Water heated up at a slow
constant rate• Softening point is temperature
at which ball falls through
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Hand Held Viscometer• Haake/Rion viscometer or equivalent• Viscometer must be calibrated• Viscosity range 1500 - 4000 cp @ 375°F• Target viscosity: hot mix binder is about 2500 -
3500 cp, chip seal binder 1800 – 2200cp• Viscosity is a very good indicator of other
binder properties
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Critical Factors Affecting Asphalt Rubber Binder
• Grade and source of base asphalt
• Amount of crumb rubber• Gradation of crumb rubber• Reaction time and temperature
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Rubber particles in the binder help fight cracking
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20 % CRM
HighViscosity
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Current Use Asphalt Rubber Strategies
• Asphalt Rubber Hot Mix (Gap graded and open graded)
• Asphalt Rubber Chip Seal• Asphalt Rubber Cape Seal• Multi-Layer Systems
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Properly blended binder
Good performing pavement strategy
Results in
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Thank You