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connectionsCompanyMembersPersonalMembersRelatedAssociations-Figure1.Figure2.Figure3.Figure4.DrGregArnoldPavespecLtdwww.asa-inc.org.auAPRIL1103TherutresistantperformanceofslagaggregatesinpavementsSLAGINSIDERAprimaryroleofourAssociationistobringtogetherSlagProducersProcessorsCustomersSupplierstotheSlagIndustry.Ouractivitiescovertechnicaldevelopmentsplantoperationsandprocesseseducationandpromotion.IfyouwouldlikemoreinformationontheAssociationandhowyoucanbecomeinvolvedsimplycompletetheinformationsectionattheendofthisnewsletter.Currentmembershipisaslisted.AndersonLGregoryGHanleyPHon.HeatonBHon.HinczakDrIHon.JamesWHon.JonesDEHon.ProsserSDHon.VenourMHon.AustralianSteelMillServicesPtyBISIndustialLogisticsBoralCementLtdBluescopeSteelLtdPortKemblaCementAustraliaConcritePtyLtdCSIROHiSmeltLtdHolcimPtyLtdHolcimNZLtdHarscoMetalHoldingsPtyLtdMonashUniversityNewZealandSteelMineralsOneSteelLimitedRoadsTrafcAuthorityofNSWSCESteelstoneSteelCementLtdSwinburneUniversityofTechnologyUniversityofNewcastleUniversityofQueenslandUniversityofWollongongCanadianSlagAssociationNationalSlagAssociationUSNipponSlagAssociationJapanEuropeanSlagAssociationEUAnewdevelopmentonthehorizonforaggregatespecicationsistheintroductionofaRepeatedLoadTriaxialRLTtestFigure1tomeasuretheperformanceofbasecourseaggregatesforroadpavements.ThistesthasbeenaroundforsometimeinresearchcirclesbeingabletosimulatevehicleloadinginthelaboratorytopredicttheonroadperformanceofanaggregatesaysDrGregArnoldmanagingdirectorofPavespecLtd.DrGregArnoldcompletedhisdoctoratefromtheUniversityofNottinghamEnglandin2004todevelopanRLTtesttopredicttheperformanceofaggregatesandhascontinuedhisresearchinNewZealandassistingtheNewZealandTransportAgencytodevelopapracticaltestandmethodofpredictingperformanceintheroadtoassesstheriskofearlyruttingfailureFigure2ofexistingandnon-traditionalaggregatessuchasMelterSlags.DrArnoldsaysTheRepeatedLoadTriaxialRLTtestprovidestheopportunitytoproveinthelaboratorythatalternativematerialswouldworkintheroadwithouttheneedforroadtrials.Allsortsofoptionsarepossiblefordevelopingalternativeaggregatesthatwilldothejobontheroadasabasecoursebutdonotnecessarilymeetanytraditionalspecications.Onamoredisconcertingnotecurrentaggregatescomplyingwithexistingspecicationsmaynotstanduptotodaysheavyvehicleloadings.Despiteallthatefforttomeetthebasecoursespecicationrequirementsforgradingcrushedfacessourcerockdurabilitysandequivalentandnescontentthenalaggregatemixmaynothavethenecessarystrengthwhenwetandbecomeblamedforearlypavementfailures.Aggregatesgettheirstrengthfromstoneroughnessandshapeintermsofhowtheyinterlockandslideagainsteachother.Existingspecicationsdonotconsiderthesefactors.TheRLTtestisameasureoftheaggregatesperformanceandcandeterminewithappropriateanalysiswhetherornotitwillsurvivewithminimalruttingoverthedesignlifeoftheroad.RLTtestscanbeconductedatdifferentmoisturecontentstoseewhetherornotanaggregatewillfailifitgetswet.ManyRLTtestshavebeenconductedonarangeofdifferentmaterialstodeterminetheirsuitabilityasaroadaggregatesuchasthosefromwasteandrecycledsources.TestsonMelterSlagaggregateinNewZealandandAustraliashowtheperformanceisthesameorbetterthantraditionalquarriedcrushedrockroadbaseanditsuseshouldnotberestricted.InfacttheperformanceofMelterSlagaggregateissuperiortocrushedrockwhenwetprobablyduetonilclaynes.ResultsareplottedinFigures3and4.RepeatedLoadTriaxialTestEquipmenttoMeasureRutResistancetoAggregates.EarlyRuttingFailureofGranularPavement.RLTResultsNotelowpermanentstrainindicatesgoodrutresistance.ResultsofRLTAnalysesintermsEquivalentStandardAxles8.2tonneDualTyredAxletoAchievea10mmRut.