【astm標(biāo)準(zhǔn)】c 666 - c 666m - 15

1、Designation:C666C666M?15StardTestMethodfResistanceofConcretetoRapidFreezingThawing1ThisstardisissuedunderthefixeddesignationC666C666Mthenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofr

2、evisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.ThisstardhasbeenapprovedfusebyagenciesoftheU.S.DepartmentofDefense.1

3、.Scope1.1Thistestmethodcoversthedeterminationoftheresistanceofconcretespecimenstorapidlyrepeatedcyclesoffreezingthawinginthelabatybytwodifferentprocedures:ProcedureARapidFreezingThawinginWaterProcedureBRapidFreezinginAir

4、ThawinginWater.Bothproceduresareintendedfuseindeterminingtheeffectsofvariationsinthepropertiesofconcreteontheresistanceoftheconcretetothefreezingthawingcyclesspecifiedintheparticularprocedure.Neitherprocedureisintendedto

5、provideaquantitativemeasureofthelengthofservicethatmaybeexpectedfromaspecifictypeofconcrete.1.2ThevaluesstatedineitherinchpoundunitsSIunitsshallberegardedseparatelyasstard.TheSIunitsareshowninbrackets.Thevaluesstatedmayn

6、otbeexactequivalentstherefeeachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwounitsmayresultinnonconfmance.1.3AllmaterialinthistestmethodnotspecificallydesignatedasbelongingtoProcedureAProcedureBapplies

7、toeitherprocedure.1.4Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatyli

8、mitationspritouse.2.ReferencedDocuments2.1ASTMStards:2C157C157MTestMethodfLengthChangeofHardenedHydraulicCementMtarConcreteC192C192MPracticefMakingCuringConcreteTestSpecimensintheLabatyC215TestMethodfFundamentalTransvers

9、eLongitudinalTsionalResonantFrequenciesofConcreteSpecimensC233TestMethodfAirEntrainingAdmixturesfConcreteC295GuidefPetrographicExaminationofAggregatesfConcreteC341C341MPracticefPreparationConditioningofCastDrilledSawedSp

10、ecimensofHydraulicCementMtarConcreteUsedfLengthChangeMeasurementsC490PracticefUseofApparatusftheDeterminationofLengthChangeofHardenedCementPasteMtarConcreteC494C494MSpecificationfChemicalAdmixturesfConcreteC670PracticefP

11、reparingPrecisionBiasStatementsfTestMethodsfConstructionMaterialsC823PracticefExaminationSamplingofHardenedConcreteinConstructions2.2ASTMSTP:2ASTMSTP169CD[12]SignificanceofTestsPropertiesofConcreteConcreteMakingMaterials

12、3.SignificanceUse3.1Asnotedinthescopethetwoproceduresdescribedinthistestmethodareintendedtodeterminetheeffectsofvariationsinbothpropertiesconditioningofconcreteintheresistancetofreezingthawingcyclesspecifiedintheparticul

13、arprocedure.SpecificapplicationsincludespecifieduseinSpecificationC494C494MTestMethodC233rankingofcoarseaggregatesastotheireffectonconcretefreezethawdurabilityespeciallywheresoundnessoftheaggregateisquestionable.3.2Itisa

14、ssumedthattheprocedureswillhavenosignificantlydamagingeffectsonfrostresistantconcretewhichmaybedefinedas(1)anyconcretenotcriticallysaturatedwithwater(thatisnotsufficientlysaturatedtobedamagedbyfreezing)(2)concretemadewit

15、hfrostresistantaggregateshavinganadequateairvoidsystemthathasachieved1ThistestmethodisunderthejurisdictionofASTMCommitteeC09onConcreteConcreteAggregatesisthedirectresponsibilityofSubcommitteeC09.67onResistancetotheEnviro

16、nment.CurrenteditionapprovedFeb.12015.PublishedMarch2015.iginallyapprovedin1971.Lastpreviouseditionapprovedin2008asC666C666M–03(2008).DOI:10.1520C0666_C0666M15.2FreferencedASTMstardsSpecialTechnicalPublications(STPs)visi

17、ttheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternation

18、al100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1isrequiredthatthesametargetspecimenthawtemperaturebeusedthroughoutthetestingofanindividualspecimensinceachangeinspecimentemperatureatthetimeoflengthmeas

19、urementcanaffectthelengthofthespecimensignificantly.5.FreezingThawingCycle5.1Baseconfmitywiththerequirementsfthefreezingthawingcycleontemperaturemeasurementsofcontrolspecimensofsimilarconcretetothespecimensundertestinwhi

20、chsuitabletemperaturemeasuringdeviceshavebeenimbedded.Changethepositionofthesecontrolspecimensfrequentlyinsuchawayastoindicatetheextremesoftemperaturevariationatdifferentlocationsinthespecimencabi.5.2Thenominalfreezingth

21、awingcyclefbothproceduresofthistestmethodshallconsistofalternatelyloweringthetemperatureofthespecimensfrom40to0F[4to18C]raisingitfrom0to40F[18to4C]innotlessthan2nmethan5h.FProcedureAnotlessthan25%ofthetimeshallbeusedftha

22、wingfProcedureBnotlessthan20%ofthetimeshallbeusedfthawing(Note4).Attheendofthecoolingperiodthetemperatureatthecentersofthespecimensshallbe063F[1862C]attheendoftheheatingperiodthetemperatureshallbe4063F[462C]withnospecime

23、natanytimereachingatemperaturelowerthan3F[19C]nhigherthan43F[6C].Thetimerequiredfthetemperatureatthecenterofanysinglespecimentobereducedfrom37to3F[3to16C]shallbenotlessthanonehalfofthelengthofthecoolingperiodthetimerequi

24、redfthetemperatureatthecenterofanysinglespecimentoberaisedfrom3to37F[16to3C]shallbenotlessthanonehalfofthelengthoftheheatingperiod.Fspecimenstobecomparedwitheachotherthetimerequiredtochangethetemperatureatthecentersofany

25、specimensfrom35to10F[2to12C]shallnotdifferbymethanonesixthofthelengthofthecoolingperiodfromthetimerequiredfanyspecimenthetimerequiredtochangethetemperatureatthecentersofanyspecimensfrom10to35F[12to2C]shallnotdifferbymeth

26、anonethirdofthelengthoftheheatingperiodfromthetimerequiredfanyspecimen.NOTE4—Inmostcasesunifmtemperaturetimeconditionscanbecontrolledmostconvenientlybymaintainingacapacityloadofspecimensintheequipmentatalltimes.Intheeven

27、tthatacapacityloadoftestspecimensisnotavailabledummyspecimenscanbeusedtofillemptyspaces.Thisprocedurealsoassistsgreatlyinmaintainingunifmfluidlevelconditionsinthespecimensolutiontanks.Thetestingofconcretespecimenscompose

28、dofwidelyvaryingmaterialswithwidelyvaryingthermalpropertiesinthesameequipmentatthesametimemaynotpermitadherencetothetimetemperaturerequirementsfallspecimens.Itisadvisablethatsuchspecimensbetestedatdifferenttimesthatappro

29、priateadjustmentsbemadetotheequipment.5.3Thedifferencebetweenthetemperatureatthecenterofaspecimenthetemperatureatitssurfaceshallatnotimeexceed50F[28C].5.4Theperiodoftransitionbetweenthefreezingthawingphasesofthecycleshal

30、lnotexceed10minexceptwhenspecimensarebeingtestedinaccdancewith8.3.6.Sampling6.1Constituentmaterialsfconcretespecimensmadeinthelabatyshallbesampledusingapplicablestardmethods.6.2Samplescutfromhardenedconcretearetobeobtain

31、edinaccdancewithPracticeC823.7.TestSpecimens7.1ThespecimensfuseinthistestmethodshallbeprismscylindersmadecuredinaccdancewiththeapplicablerequirementsofPracticeC192C192MSpecificationC490.7.2Specimensusedshallnotbelessthan

32、3in.[75mm]nmethan5in.[125mm]inwidthdepthdiameternotlessthan11in.[275mm]nmethan16in.[405mm]inlength.7.3Testspecimensmayalsobecesprismscutfromhardenedconcrete.Ifsothespecimensshouldnotbeallowedtodrytoamoistureconditionbelo

33、wthatofthestructurefromwhichtaken.Thismaybeaccomplishedbywrappinginplasticbyothersuitablemeans.ThespecimenssoobtainedshallbefurnishedwithgagestudsinaccdancewithTestMethodC341C341M.7.4Fthistestthespecimensshallbestedinsat

34、uratedlimewaterfromthetimeoftheirremovalfromthemoldsuntilthetimefreezingthawingtestsarestarted.Allspecimenstobecomparedwitheachotherinitiallyshallbeofthesamenominaldimensions.8.Procedure8.1Moldedbeamspecimensshallbecured

35、f14dayspritotestingunlessotherwisespecified.Beamspecimenssawedfromhardenedconcreteshallbemoistureconditionedbyimmersinginsaturatedlimewaterat73.463F[23.062.0C]f48hpritotestingunlessotherwisespecified.8.2Immediatelyaftert

36、hespecifiedcuringconditioningperiodbringthespecimentoatemperaturewithin2F4F[1C2C]ofthetargetthawtemperaturethatwillbeusedinthefreezethawcycletestffundamentaltransversefrequencydeterminethemassaveragelengthcrosssectiondim

37、ensionsoftheconcretespecimenwithinthetolerancerequiredinTestMethodC215determinetheinitiallengthcomparatreading(optional)fthespecimenwiththelengthchangecomparat.Protectthespecimensagainstlossofmoisturebetweenthetimeofremo

38、valfromcuringthestartofthefreezingthawingcycles.8.3Startfreezingthawingtestsbyplacingthespecimensinthethawingwateratthebeginningofthethawingphaseofthecycle.Removethespecimensfromtheapparatusinathawedconditionatintervalsn

39、otexceeding36cyclesofexposuretothefreezingthawingcyclestestffundamentaltransversefrequencymeasurelengthchange(optional)withthespecimenswithinthetemperaturerangespecifiedfthetemperingtankin4.6determinethemassofeachspecime