By: Lauren HueyNathan LangdonMaggie OrtizThe Illinois Street Intermodal BridgeThe Illinois Street Intermodal BridgeOverview / HistoryOverview / History• Start date: October 2004• Estimated Finish Date: September 2006• 525-feet long, 40-feet wide• Crosses Islais Creek in San Francisco• Will serve rail road access and traffic flows• Single leaf bascule non-counterweighted lift assembly3 Site Visits3 Site VisitsFebruary 3, 2006Formwork placementFebruary 22, 2006Concrete placementApril 10, 2006Curing completed• 3 different mixes: - Bridge deck -Piles-Pile caps• Main concern: Corrosion ControlConcrete Mix DesignConcrete Mix DesignConcrete Mix Design Concrete Mix Design ––Bridge Bridge DeckDeck• Type II Cement• Design Strength: 4,060 psi• w/c = 0.4• Slump = 6 in.• Air content: 1.5%• Pozzolan (metakaolin) content: 10%• Coarse Aggregate: 44% by weight (max size = 1 in.)• Fine aggregate:33 % by weight (natural sand)• Admixtures:- water reducer- high range water reducerConcrete Mix Design Concrete Mix Design ––Piles & Pile CapsPiles & Pile CapsType II CementDesign Strength: 4,000 psiFly ash content: 25% (by weight)Air content: 1.5%Coarse aggregate: #57Fine aggregate: Natural sandAdmixtures:- water reducer- accelerator (only in pile caps!)Concrete PlacementConcrete PlacementBullfloaterHand finisherQuality ControlScreeders & ShovelersVibratorsProject ManagerConcrete Pump Boom OperatorPump Truck TechnicianFormwork CarpentersConcrete NozzlemenReinforcementReinforcement• Epoxy-coated rebar• High quality control for corrosion controlPouring Pouring • Pour date: February 22• 80 yd3was poured over 4 hoursEquipmentEquipmentFinishingFinishing• Smooth finish over sidewalk• Rough finish for asphalt coverCuringCuring• Chemical curing using aqua resin• Wet curing using “Burlene”• Both curing techniques used to ensure full curingQuality ControlQuality
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