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GreenBuildings-HowtheproposedGreenBuildingCouncilofAustraliaGBCAConcretesystemwillworkTomBennIntroductionProposalinBriefNotestoTable1NotestoTable2ConclusionsTwopointsareavailableifthePortlandcementcomponentofalltheconcreteintheprojectissubstitutedbysupplementarycementitiousmaterialsasfollows.CurrentProposedCurrentProposedADAAAPRIL1105Inlate2009theGBCAinitiatedareviewofthecreditpointsavailableforconcreteintheGreenStarratingsystem.Anexpertpanelwasappointeddrawingmembersfromacrosstheconcreteindustryincludingcementitiousmaterialsuppliersconcreteproducersdesignengineersacademicsandalternateconcretetechnologysuppliers.Thecommitteedebatedanddiscussedproposalswithcolleaguesandinterestedbodiestoproducetheproposalcurrentlyoutforpublicreview.Duringthelengthyperiodofreviewaconsensuswasreachedthatthreepointsforconcretewasaboutrightinrespectofthe75to100requiredfora6-Starrating.Acomparisonbetweenthecurrentandproposedcriteriahasbeentabulatedinthetwotablesbelow.ThereferenceconcreteistabulatedintheConcreteCreditproposalanditissuggestedthatengineeringjudgmentwillberequiredforspecialgradeconcretesastotheclosestperformingmix.PortlandcementisdenedasperAS3972-2011asGroundPortlandCementClinkerandCalciumSulphate.TheuseofalternatefuelsshallbeindependentlyveriedTheuseofalternateneandcoarseaggregateshallnotincreasethePortlandCementcontentbymorethan5Kgm3Theproposalgoesalongwaytoattempttoachieveapracticalmethodologythatwillresultinachievabletargetsthroughoutthecountry.ItisalsoimportantthattheproposalbereadinconjunctionwiththefollowinginformationavailableontheGBCAwebsitewww.gbca.org.auBackgroundandOutcomesGreenStarConcreteCreditReviewConcreteCreditRevisedcreditwilldrivedemandforenvironmentallyresponsibleconcretemediarelease1Dec2010DraftRevisedConcreteCreditReleasedforPublicComment1Dec20101-Point30reductionforin-situconcrete10reductionforpre-castconcrete15reductionforstressedconcrete30reductioncomparedtothereferenceconcrete2-Points60reductionforin-situconcrete40reductionforpre-castconcrete30reductionforstressedconcrete40reductioncomparedtothereferenceconcreteWhereatleastoneoftherequirementsofTable1hasbeensatisedWhereoneofthetwocriteriaismet20ofallaggregatesinthestructuralconcreteisrecycledorisslagaggregateAllcementissourcedfrommanufacturersusingatleast4alternatefuelsacrossthecompanytomanufactureclinkerCNonaturalaggregatesareusedinthenon-structuralconcrete40ofthecoarseaggre-gateisslagaggregateoralternatematerialsor25oftheneaggregateismanufacturedsandoralternatematerials