【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】:


MIL-C-28840A (AMENDMENT 6), MILITARY SPECIFICATION: CONNECTORS, ELECTRICAL, CIRCULAR, THREADED, HIGH DENSITY, HIGH SHOCK, SHIPBOARD, CLASS D, GENERAL SPECIFICATION FOR (5 MAY 2000) [S/S BY MIL-DTL-28840B]., This amendment forms a part of MIL-C-28840A, dated 26 May 1981, and is approvedfor use by the Space and Naval Warfare Systems Command, Department of The Navy,and is available for use by all Departments and Agencies of the Department of Defense.