2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Designation:C1581C1581M?09aStardTestMethodfDeterminingAgeatCrackingInducedTensileStressacteristicsofMtarConcreteunderRestrainedShrinkage1ThisstardisissuedunderthefixeddesignationC1581C1581Mthenumberimmediatelyfollowingth

2、edesignationindicatestheyearofiginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Th

3、istestmethodcoversthelabatydeterminationoftheageatcrackinginducedtensilestressacteristicsofmtarconcretespecimensunderrestrainedshrinkage.Theprocedurecanbeusedtodeterminetheeffectsofvariationsintheproptionsmaterialpropert

4、iesofmtarconcreteoncrackingduetobothdryingshrinkagedefmationscausedbyautogenousshrinkageheatofhydration.1.2Thistestmethodisnotintendedfexpansivematerials.1.3ThevaluesstatedineitherSIunitsinchpoundunitsaretoberegardedsepa

5、ratelyasstard.Thevaluesstatedineachsystemmaynotbeexactequivalentstherefeeachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconfmancewiththestard.1.4Thisstarddoesnotpurpttoaddressal

6、lofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticestodeterminetheapplicabilityofregulatylimitationspritouse.(Warning—Freshhydrauliccementitio

7、usmixturesarecausticmaycausechemicalburnstoskintissueuponprolongedexposure.2)2.ReferencedDocuments2.1ASTMStards:3C33SpecificationfConcreteAggregatesC138C138MTestMethodfDensity(UnitWeight)YieldAirContent(Gravimetric)ofCon

8、creteC143C143MTestMethodfSlumpofHydraulicCementConcreteC150SpecificationfPtlCementC171SpecificationfSheetMaterialsfCuringConcreteC192C192MPracticefMakingCuringConcreteTestSpecimensintheLabatyC387SpecificationfPackagedDry

9、CombinedMaterialsfMtarConcreteC595SpecificationfBlendedHydraulicCementsC1157PerfmanceSpecificationfHydraulicCementC1437TestMethodfFlowofHydraulicCementMtarF441F441MSpecificationfChlinatedPoly(VinylChloride)(CPVC)PlasticP

10、ipeSchedules40802.2ASMEStards:4B46.1SurfaceTexture(SurfaceRoughnessWavinessLay)3.SummaryofTestMethod3.1Asampleoffreshlymixedmtarconcreteiscompactedinacircularmoldaroundaninstrumentedsteelring.Thecompressivestraindevelope

11、dinthesteelringcausedbyshrinkageofthemtarconcretespecimenismeasuredfromthetimeofcasting(16).5Crackingofthetestspecimenisindicatedbyasuddendecreaseinthesteelringstrain.Theageatcrackingtherateoftensilestressdevelopmentinth

12、etestspecimenareindicatsofthematerial’sresistancetocrackingunderrestrainedshrinkage.4.SignificanceUse4.1Thistestmethodisfrelativecomparisonofmaterialsisnotintendedtodeterminetheageatcrackingofmtarconcreteinanyspecifictyp

13、eofstructureconfigurationexposure.4.2Thistestmethodisapplicabletomixtureswithaggregatesof13mm[0.5in.]maximumnominalsizeless.1ThistestmethodisunderthejurisdictionofASTMCommitteeC09onConcreteConcreteAggregatesisthedirectre

14、sponsibilityofSubcommitteeC09.68onVolumeChange.CurrenteditionapprovedJuly12009.PublishedAugust2009.iginallyapprovedin2004.Lastpreviouseditionapprovedin2009asC1581–09.DOI:10.1520C1581_C1581M09A.2SectiononSafetyPrecautions

15、ManualofAggregateConcreteTestingAnnualBookofASTMStardsVol04.02.3FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageont

16、heASTMwebsite.4AvailablefromAmericanSocietyofMechanicalEngineers(ASME)ASMEInternationalHeadquartersThreeParkAve.NewYkNY100165990:www.asme.g.5Theboldfacenumbersinparenthesisrefertothelistofreferencesattheendofthistestmeth

17、od.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates18.3Makecureatleastthreetestspecimensfeachmaterialtestconditionfollowingthe

18、applicablerequirementsofPracticeC192C192M.Inmakingaspecimenplacethetestspecimenmoldonavibratingtablefillthemoldintwoapproximatelyequallayersrodeachlayer75timesusinga10mm[3?8in.]diameterrodvibrateeachlayertoconsolidatethe

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