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1、Designation:C1240?15StardSpecificationfSilicaFumeUsedinCementitiousMixtures1ThisstardisissuedunderthefixeddesignationC1240thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisionthey

2、earoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thisspecificationcoverssilicafumefuseinconcreteothersystemscontaining

3、hydrauliccement.1.2Inthecasesofslurrieddensifiedsilicafumeperfmthetestsontherawsilicafumefromwhichtheseproductshavebeenmade.1.3TheunitsstatedinSIaretoberegardedasthestard.Nootherunitsofmeasurementareincludedinthisstard.1

4、.4ThefollowingsafetyhazardscaveatpertainsonlytothetestmethodsptionsSections10–19ofthisspecification:Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardt

5、oestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.Readthematerialsafetydatasheetsfmaterialsused.1.5Thetextofthisstardreferencesnotesfootnotesthatprovideexplanatyinfmation.Th

6、esenotesfootnotes(excludingthoseintables)shallnotbeconsideredasrequirementsofthisstard.2.ReferencedDocuments2.1ASTMStards:2C109C109MTestMethodfCompressiveStrengthofHydraulicCementMtars(Using2in.[50mm]CubeSpecimens)C114Te

7、stMethodsfChemicalAnalysisofHydraulicCementC125TerminologyRelatingtoConcreteConcreteAggregatesC135TestMethodfTrueSpecificGravityofRefractyMaterialsbyWaterImmersionC183PracticefSamplingtheAmountofTestingofHydraulicCementC

8、185TestMethodfAirContentofHydraulicCementMtarC219TerminologyRelatingtoHydraulicCementC311C311MTestMethodsfSamplingTestingFlyAshNaturalPozzolansfUseinPtlCementConcreteC430TestMethodfFinenessofHydraulicCementbythe45m(No.32

9、5)SieveC441C441MTestMethodfEffectivenessofPozzolansGroundBlastFurnaceSlaginPreventingExcessiveExpansionofConcreteDuetotheAlkaliSilicaReactionC494C494MSpecificationfChemicalAdmixturesfConcreteC604TestMethodfTrueSpecificGr

10、avityofRefractyMaterialsbyGasComparisonPycnometerC670PracticefPreparingPrecisionBiasStatementsfTestMethodsfConstructionMaterialsC1005SpecificationfReferenceMassesDevicesfDeterminingMassVolumefUseinthePhysicalTestingofHyd

11、raulicCementsC1012C1012MTestMethodfLengthChangeofHydraulicCementMtarsExposedtoaSulfateSolutionC1069TestMethodfSpecificSurfaceAreaofAluminaQuartzbyNitrogenAdsptionC1157C1157MPerfmanceSpecificationfHydraulicCementC1437Test

12、MethodfFlowofHydraulicCementMtar3.Terminology3.1Definitions:3.1.1silicafumen—veryfinepozzolanicmaterialcomposedmostlyofamphoussilicaproducedbyelectricarcfurnacesasabyproductoftheproductionofelementalsiliconferrosiliconal

13、loys(alsoknownascondensedsilicafumemicrosilica).3.1.2silicafumedensifiedn—silicafumeprocessedtoincreasebulkdensitytofacilitatehlingshipping.3.1.3silicafumeundensifiedn—silicafumeinitsrawasproducedascollectedunprocessedfm

14、.3.1.4OthertermsinthisspecificationaredefinedinTerminologiesC125C219.1ThisspecificationisunderthejurisdictionofASTMCommitteeC09onConcreteConcreteAggregatesisthedirectresponsibilityofSubcommitteeC09.24onSupplementaryCemen

15、titiousMaterials.CurrenteditionapprovedJune152015.PublishedSeptember2015.iginallyapprovedin1993.Lastpreviouseditionapprovedin2014asC1240–14.DOI:10.1520C124015.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactAST

16、MCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1eachofthesamplesi

17、nagrouptakeequalptionssufficientinamounttofmacompositesamplelargeenoughtopermitmakingtherequiredphysicalchemicaldeterminations.9.2Pritotestingmixgrabsamplescompositesamplesthoughly.Acleandrylabatyconcretedrummixerprovide

18、sadequatemixingfthispurpose.Takecaretolimitthevolumeofsilicafumeinthedrummixertotherangeof10to50%ofthedrum’stotalcapacity.Ifnecessarysecureasheetofpolyethylenefilmonthedrumwithanelastictiedowntokeepthematerialinthedrum.L

19、imitthemixingactionto561min.9.2.1Whenasmallsamplesizeprecludestheuseofaconcretemixeruseaheavyplasticbagofacapacityatleastfivetimeslargerthanthesamplevolumetomixthesamplethoughly.Afterplacingthesampleinthebagclosethebagby

20、tyingthebagopeningtightlymixthematerialbyrollingthebagaroundf561min.9.3Takematerialfspecifictestsfromathoughlymixedsamplebyusingasamplingdevice(samplingtubescoopsofth)ofappropriatesizetomakeatestspecimen.Makethistestspec

21、imenfromatleastsixromsubsamples.TESTMETHODS—CHEMICALANALYSIS10.SiliconDioxideTotalAlkalies10.1ReferenceMethod—UsethereferencemethodinTestMethodsC114fcementswithinsolubleresiduegreaterthan1%.Analystsperfmingsodiumoxidepot

22、assiumoxidedeterminationsshallobservetheprecautionsoutlinedintheapplicablesectionofPerfmanceSpecificationC1157C1157M(refertothesectiononTestMethods).Mostpozzolansdissolvecompletelyinlithiumbatefluxes.11.MoistureContentLo

23、ssonIgnition11.1FollowtheapplicableprovisionsofTestMethodsC311C311M.TESTMETHODS—PHYSICALTESTS12.Density12.1DeterminedensityusingeitherTestMethodC135asmodifiedin12.1.1TestMethodC604.12.1.1TestMethodC135modifiedasfollows:1

24、2.2Equipment:12.2.1Two500mLVolumetricFlasksClassA.12.2.2Balancewithanaccuracyofatleast0.01g.12.2.3ConstantTemperatureBathcapableofbeingregulatedwithin60.5C.12.3DeionizedWater.12.4Procedure:12.4.1Determinethedensityofthem

25、aterialasreceivedunlessotherwisespecifiedasfollows.IfdensitydeterminationonanignitedsampleisrequiredfirstignitethesampleasdescribedinthetestflossonignitionintheapplicablesectiongiveninTestMethodsC114.12.4.2Determinethema

26、ss(Wf)ofa500mLvolumetricflasktoanaccuracyof0.01g.Add30gofsilicafume.Determinethemassoftheflaskthecontents(Wa)tothenearest0.01g.Addwatertotheflasktofillitonehalffullshakeittoensurethoughwettingofthematerial.Filltothemarkw

27、ithwater.Removeairbubblesbyshakingtheflaskat15minintervalsuntiltheliquidisfreeofairbyapplyingavacuumtotheflask.Afteralloftheairbubblesareremovedplacetheflaskinaconstanttemperaturebathat2360.5Cuntiltheflaskitscontentsreac

28、haconstanttemperature.Removetheflaskfromthewaterbathimmediatelyaddremovewateratthesametemperaturetotheflasktogetthemeniscusonthemark.Wipedrytheexterioftheflaskdeterminethemassoftheflaskitscontents(Ws).12.4.3Emptycleandet

29、erminethemassofthe500mLvolumetricflaskusedabovefilledtothemarkwithwater(Wt)stabilizedat2360.5C.12.5Calculation:Dsf5~Wa2Wf!500mL2@~Ws2Wa!Dw#(1)where:Dsf=densityofsilicafumeMgm3Wf=massof500mLvolumetricflaskgWa=massof500mLv

30、olumetricflaskplusapproximately30gofsilicafumegWs=massof500mLvolumetricflaskplussilicafumepluswatertothemarkgWt=massof500mLvolumetricflaskpluswatertothemarkgDw=(Wt?Wf)500mLMgm3.12.6Repttheaverageoftwodensitydetermination

31、sthetestmethodusedindeterminingthedensity.13.OversizeAmountRetainedWhenWetSievedona45m(No.325)Sieve13.1UseTestMethodC430.CalibratethesievesinaccdancewithTestMethodC430.NOTE2—Oversizeisusedtodeterminetheamountofcontaminat

32、ingmaterialretainedonthe45msieve.SeeAppendixX2.14.SpecificSurface14.1DeterminethespecificsurfacebytheBETnitrogenadsbtionmethodinaccdancewithTestMethodC1069.15.AirEntrainmentofMtar15.1FollowtheapplicableprovisionsofTestMe

33、thodsC311C311MexceptusethefollowingtestmixtureequationfWc:TestMixturePtlcementg300Silicafumeg3020–30StardOttawasg1170WatermLsufficienttogiveaflowof80to95%YNeutralizedVinsolresinsolutionmLsufficienttoproduceanaircontentof

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