Asphalt-Rubber Blending Systems › images › presentations › asphalt › AR...Asphalt-Rubber...
Transcript of Asphalt-Rubber Blending Systems › images › presentations › asphalt › AR...Asphalt-Rubber...
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Asphalt-Rubber Blending Systems
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CEI EnterprisesSince 1991, CEI Enterprises has been designing industry-leading technologies for blending crumb rubber with asphalt cement for highway paving applications.
With over 30 Asphalt-Rubber blending plants delivered, CEI equipment designs incorporate leading technologies that have earned our #1 market share.
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Asphalt-RubberAsphalt-Rubber is defined by ASTM definition D8-88 as:
“A blend of asphalt cement, reclaimed tire rubber and certain additives in which the rubber component is at least 15% by weight of the total blend and has reacted in the asphalt cement sufficiently to cause swelling of the rubber.”
In actual practice, the rubber component is normally 20% of the binder by weight.
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Asphalt-Rubber Attributes• Better reflective crack resistance• Darker in color, providing enhanced pavement markings• Better water drainage and skid resistance• Cost effective, long-term performance that provides years of
maintenance-free road surfaces• Cost effective, a thinner lift requires less time to grind, less
material to lay and a short construction period• Can be used in any climatic area — hot or cold• Quieter than any other paving material available• Keeps tires out of landfills or stockpiles
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CEI Asphalt-Rubber Blending Plant
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CEI Asphalt-Rubber Blending Plant
Crumb-Rubber Blending Plants are designed with a wide range of options to suit particular users requirements.
Options are readily available to meet any specific needs and any customer preferences.
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Asphalt-Rubber Blending
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Basic Blending Criteria• Flow controls for virgin asphalt, crumb rubber and any
additives• Automated PLC-based control system for accurate
proportioning• High-shear mixing for product uniformity• High heat system in BTU and temperature to drive the
reactions• Blended asphalt-rubber sent to reaction tank at final
temperature• Compliance with all emissions standards
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Crumb Rubber Hopper• Crumb rubber hopper
includes an air canon to insure free-flowing material
• Rotary feeder controls the specified volume to the mixing can
• Load cells accurately measure material by weight
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Asphalt Supply & A-R Pumps
• Asphalt supply and A-R pumps are readily available designs
• AC supply pump is complete with a Variable Frequency Drive (VFD)
• Strainers protect against foreign and oversized material flows
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High Capacity Heating• High BTU output:
5.0 MMBTU/HR• Hot oil temperatures:
600 degrees F maximum
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Heat Exchanger
• Blended Asphalt-Rubber is delivered to the Reaction Tank at usage temperatures for high production.
• Virgin AC is controlled at temperature compensated mass flow rates for accurate weight proportioning.
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Additive Systems• Liquid additives can be
added when required• The PLC control system
is designed to supply additives at a specified percentage addition rate
• A heated or non-heated storage tank is optional
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Mixing Can• High shear mixer is used to
homogenize the crumb rubber particles with the liquid asphalt
• An overflow connection is provided for those times when moisture enters the system
• The tank has dual pump connections for operation and complete drainage
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Automated PLC Controls• PLC system has flow
rate, temperature and density compensation.
• All valves are actuated and all drives have VFD drives.
• Control panel is “arc flash” designed for safety. Control house is optional.
• “Recipe-driven” logic simplifies operator functions, and flow schematics are provided in the PLC and on the panel.
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Asphalt-Rubber Reaction Tank
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Basic Reaction Criteria• High agitation for a homogenous product• Temperature control and measurement• Sampling capability for quality assurance• Separate controls per compartment• Accurate flow regulation for the plant supply• Documentation of actual performance
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Agitation and Heat Control• Multiple coil layers for
effective heat transfer• Shrouded high-speed
auger for pumping• Low-level heat shutoff• Individual controls in
each compartment
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Auger Agitation• Large coil area is used
for heat transfer• Auger provides
material agitation and flushing of the coil bundles
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Auger Design• If the coils are clean,
heat transfers, reducing maintenance costs and allowing for maximum production rates.
• If the coils plug, you not only lose heat but also capacity.
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Production Capacity
• Nominal continuous capacity ratings per 24 hour operating day• Compliant with specifications for reaction time• Available material to supply a plant - plant piping may be
insufficient for the available flow volumes
Reaction TankSingle
CompartmentDouble
CompartmentTriple
Compartment
Tons Per Hour 10 to 15 15 to 22 25 to 35
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Capacity and Emissions• Triple compartments for high
production• Vent condensers with external
cooling• Smog Hogs to control final blue
smoke fumes
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Plant Supply• Mass flow meter• Ports for calibration, drum
plant and batch plant• Sample testing valve• Ability to transfer between
each compartment
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Asphalt-Rubber Plants• Batch plants, drum plants,
or both.• If you need high
production, then go with triple-compartment designs.
• Emission regulations — NO PROBLEM.
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Asphalt-RubberFNF Construction has been presented the 2004 Sheldon G. Hayes Award for excellence in construction of an asphalt pavement.This NAPA award is a two-year process with projects over 50,000 tons of HMA.This is the first and only Asphalt-Rubber project to reach this level of industry recognition.
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CEI Enterprises• A member of the RPA
since the beginning.• Manufacturing, sales and
engineering are based in Albuquerque, NM.
• For more information, call 800-545-4034
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© 2008 CEI Enterprises, Inc.