ASTM C231/C231M-2010 压力法测定新拌混凝土中空气含量的标准试验方法

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【英文标准名称】:StandardTestMethodforAirContentofFreshlyMixedConcretebythePressureMethod
【原文标准名称】:压力法测定新拌混凝土中空气含量的标准试验方法
【标准号】:ASTMC231/C231M-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:C09.60
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:空气含量;校正;混凝土;校正因子;测量碗;仪表;压力;泵;单位重量;总校正因子
【英文主题词】:aircontent;calibration;concrete;correctionfactor;measuringbowl;meter;pressure;pump;unitweight;Aggregatecorrectionfactor
【摘要】:Thistestmethodcoversthedeterminationoftheaircontentoffreshlymixedconcrete.Thetestdeterminestheaircontentoffreshlymixedconcreteexclusiveofanyairthatmayexistinsidevoidswithinaggregateparticles.Forthisreason,itisapplicabletoconcretemadewithrelativelydenseaggregateparticlesandrequiresdeterminationoftheaggregatecorrectionfactor(see6.1and10.1).ThistestmethodandTestMethodC138/C138MandC173/C173Mprovidepressure,gravimetric,andvolumetricprocedures,respectively,fordeterminingtheaircontentoffreshlymixedconcrete.Thepressureprocedureofthistestmethodgivessubstantiallythesameaircontentsastheothertwotestmethodsforconcretesmadewithdenseaggregates.Theaircontentofhardenedconcretemaybeeitherhigherorlowerthanthatdeterminedbythistestmethod.Thisdependsuponthemethodsandamountofconsolidationeffortappliedtotheconcretefromwhichthehardenedconcretespecimenistaken;uniformityandstabilityoftheairbubblesinthefreshandhardenedconcrete;accuracyofthemicroscopicexamination,ifused;timeofcomparison;environmentalexposure;stageinthedelivery,placementandconsolidationprocessesatwhichtheaircontentoftheunhardenedconcreteisdetermined,thatis,beforeoraftertheconcretegoesthroughapump;andotherfactors.1.1Thistestmethodcoversdeterminationoftheaircontentoffreshlymixedconcretefromobservationofthechangeinvolumeofconcretewithachangeinpressure.1.2ThistestmethodisintendedforusewithconcretesandmortarsmadewithrelativelydenseaggregatesforwhichtheaggregatecorrectionfactorcanbesatisfactorilydeterminedbythetechniquedescribedinSection6.Itisnotapplicabletoconcretesmadewithlightweightaggregates,air-cooledblast-furnaceslag,oraggregatesofhighporosity.Inthesecases,TestMethodC173/C173Mshouldbeused.Thistestmethodisalsonotapplicabletononplasticconcretesuchasiscommonlyusedinthemanufactureofpipeandconcretemasonryunits.1.3Thetextofthistestmethodreferencesnotesandfootnotesthatprovideexplanatoryinformation.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthisstandard.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.(WarningFreshhydrauliccementitiousmixturesarecausticandmaycausechemicalburnstoskinandtissueuponprolongedexposure.)
【中国标准分类号】:Q13
【国际标准分类号】:91_100_30
【页数】:10P.;A4
【正文语种】: