asphalt rubber blending and placement...asphalt rubber blending and placement michael hoag / granite...

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 mike.hoag@gcinc.com (760) 775-7500

Rubber Pavements Association www.rubberpavements.org