asphalt rubber blending and placement...asphalt rubber blending and placement michael hoag / granite...
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Asphalt Rubber Blending and Asphalt Rubber Blending and PlacementPlacement
Michael Hoag / Granite Construction Co.Michael Hoag / Granite Construction Co.April 3rd, 2008April 3rd, 2008IxtapaIxtapa, Mexico, Mexico
Asphalt RubberAsphalt RubberBINDER CONSISTING OF:BINDER CONSISTING OF:
80 % Asphalt (Bitumen)80 % Asphalt (Bitumen)
20 % Ground Tire Rubber20 % Ground Tire Rubber
PRODUCTS AND PROCESSES IN THE PRODUCTS AND PROCESSES IN THE PUBLIC DOMAINPUBLIC DOMAIN
THE EQUIPMENT
CONTROL ROOM/PANEL
RUBBER HOPPER
HIGH SHEAR MIXER
VIRGIN AC STORAGE
HEATER
REACTION TANK
TRANSFER PUMPS/METERS
FROM USED TIRES
TOCRUMBRUBBER
Ground tire rubber is typically received in 2,000 pound “Supersacks”. Typical production is 20 bags/day = 40,000 lbs crumb rubber / day
Rubber is loaded into Weigh Hopper
HIGH SHEAR CONTROL PANEL
An aerial view of a portable Asphalt-RubberPlant setup at a Hotplant.
BLENDER
Hotplant
AR BLEND TANK
VIRGIN AC TANKRUBBER STAGING AREA
REACTION = MIXING + HEAT
Auger
Reaction is typically 45 – 60 minutes per batchNext Steps:1) Sample Binder for Viscosity and Temperature2) Binder in spec, now process is no different than conventional mix
- Hot Plant controls the flow of binder into the drum
PAVINGWith Asphalt Rubber Hot Mix
SAME SAME EQUIPMENTEQUIPMENT
SAME CREWSAME CREW
SAME SAME PRODUCTIONPRODUCTION
SAME SAME TECHNIQUESTECHNIQUES
NO RUBBER TIRE ROLLERNO RUBBER TIRE ROLLER
LESS TOLERANT TO HAND WORKLESS TOLERANT TO HAND WORK
LESS TOLERANT TO COLD/WET PAVINGLESS TOLERANT TO COLD/WET PAVING
Virgin Asphalt Temp: Virgin Asphalt Temp: 350350--410410°° FF
Binder Temperature:Binder Temperature: 350 350 °° -- 375375°° FF
Breakdown Roller: 300 Ft.Breakdown Roller: 300 Ft.
Ambient/Surface Temp:Ambient/Surface Temp:>65>65°°F GAP GRADEF GAP GRADE>85>85°°F OPEN GRADE (surface)F OPEN GRADE (surface)
Successful AR Production is about Heat Successful AR Production is about Heat ManagementManagement
Potential Production IssuesPotential Production Issues
Plant BreakdownsPlant Breakdowns
DonDon’’t Chance t Chance WeatherWeather
Limited Shelf LifeLimited Shelf Life
Last Day CutoffLast Day Cutoff(portable)(portable)
ContractorContractor’’s Cost Issuess Cost Issues
Develop market = blender(s) in HawaiiDevelop market = blender(s) in Hawaii
Small Projects = Larger UNIT CostsSmall Projects = Larger UNIT CostsFixed mobilizationFixed mobilizationFixed daily costs (2 plants involved)Fixed daily costs (2 plants involved)Balance unit vs. total cost Balance unit vs. total cost (thickness,reconstruct)(thickness,reconstruct)
Rubber Plant may limit Production RateRubber Plant may limit Production RateDepends on Rubber Blending Plant sizeDepends on Rubber Blending Plant size
AR-OGFC on PCCP, I-17 Phoenix, AZ
About 1000 Tires Per Lane Mile
SummarySummaryAsphalt Rubber is Asphalt Rubber is construction friendlyconstruction friendlyAR isAR is
QuietQuietSmoothSmoothlong lastinglong lastingenvironmentally soundenvironmentally sound
Michael Hoag [email protected] (760) 775-7500
Rubber Pavements Association www.rubberpavements.org