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OnceagainBFSwasthepreferredmaterialandfromJanuary2005untilOctober2007165ktofBFSstabilizedroadbasewassuppliedwhichcompliedwithRMSspecicationsR73and3051.Figure5.3-Aerialviewofcompletedproject.Figure5.2-Truckunloadingslagmaterialatsite.5.2CASESTUDY2NORTHKIAMABY-PASSSOUTHCOASTNSWTheKiamaby-passcommencedconstructionin2005withasignicantamountofslagusedoveralargearea.Thetypesofslaguseddependedonthespecicareaonwhichtheroadtraversed.Inonesection75mmofaircooledBFSwasusedasadrainagelayer.TheareaclosesttoBombobeachrequired300mmofmodiedroadbasewithan8020ratioofaircooledBFSGBFSwith2binder.5QuickReferenceGuide12013RoadsGuideSupplementonGeneralApplications5.3CASESTUDY3HUNTEREXPRESSWAYHEANEWCASTLENSWIn201167ktofslagmaterialwassuppliedtotheHunterExpresswayintheformofheavilyboundpavementandheavilyboundhighloadbearinghardstandmaterial.DuringthisprocesstheSpecicRMSspecicationRN73Ed6BoundPavementCourseSlagorAshbasedandtherelevantEPAwasteregulationspecicexemptionshavebeenconformedto.TheSFSandEAFslagsaresourcedfromthePortKemblaRootyHillandNewcastlesteel-makingoperations.InsummarytheslagmaterialsusedaddedtotheoveralleciencyoftheHunterValleyExpresswayproject.OncedeliveredtothemanufacturingfacilitytheSFSandEAFSisblendedwithotherconstituentmaterialsinacomputercontrolledprocesstoproduceaheavilyboundpavementmaterial.Thestabilisedroadbasematerialisplacedandcompactedusingacombinationofprovencivilconstructionmethodologiesandongoingbestpracticeintheuseofslagbasedmaterialsforcivilconstructionpurposes.ThismaterialhasbeenusedinanumberofapplicationsincludingHeavilyBoundPavementConstructionofnewheavilyboundtracpavementsmeetingRMSspecicationRN73Ed6.MineVoidPlatformsExistingminingvoidsunderneaththeHunterExpresswayalignmentrequiredllingtominimizetheriskofminesubsidence.Slagmaterialisapreferredmaterialtotheemplacementofunboundroadbaseduetotheincreasedproductioncapacityasaferworkingenvironmentforpersonnelonthegroundduetoastablegroundcoveringandadecreasedprogramduetoweathertolerance.AccessTracksandPlatformsforBridgeWorksMostofthe23bridgesuseda200-300mmthicklayerofBFSandSFSstabilisedroadbaseasapilingplatform.Theadvantagesofusingthismaterialincludedecreasedrunoanderosionandminimalcostlypilingdelays.Figure5.4-HeavilyBoundPavement.Figure5.5-HunterExpresswaypilingworksatbridgeBW13onalayerofstabilizedroadbase.