asphalt-rubber blending systems - cei enterprises...cei enterprises since 1991, cei enterprises has...
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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.
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.
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
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.
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
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
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
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.
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
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
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.
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
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
Auger Agitation• Large coil area is used
for heat transfer• Auger provides
material agitation and flushing of the coil bundles
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.
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
Capacity and Emissions• Triple compartments for high
production• Vent condensers with external
cooling• Smog Hogs to control final blue
smoke fumes
Plant Supply• Mass flow meter• Ports for calibration, drum
plant and batch plant• Sample testing valve• Ability to transfer between
each compartment
Asphalt-Rubber Plants• Batch plants, drum plants,
or both.• If you need high
production, then go with triple-compartment designs.
• Emission regulations — NO PROBLEM.
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.
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