【英文标准名称】:StandardTestMethodsforApparentPorosity,WaterAbsorption,ApparentSpecificGravity,andBulkDensityofBurnedRefractoryBrickandShapesbyBoilingWater
【原文标准名称】:用沸水法测定烧过的耐火砖和异型砖的表观多孔性,吸水性,表观比重及松密度的测试方法
【标准号】:ASTMC20-2000(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:2000
【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】:C08.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:apparentporosity;apparentspecificgravity;bulkdensity;refractoryshapes;waterabsorption;waterboil;Boilingwatertest;Bulkdensity;Burnedrefractorybrick;Density--refractorymaterials;Porosity--apparent;Refractories(brickandshapes)-
【摘要】:Apparentporosity,waterabsorption,apparentspecificgravity,andbulkdensityareprimarypropertiesofburnedrefractorybrickandshapes.Thesepropertiesarewidelyusedintheevaluationandcomparisonofproductqualityandaspartofthecriteriaforselectionanduseofrefractoryproductsinavarietyofindustrialapplications.Thesetestmethodsareusedfordetermininganyoralloftheseproperties.Thesetestmethodsareprimarystandardmethodswhicharesuitableforuseinqualitycontrol,researchanddevelopment,establishingcriteriaforandevaluatingcompliancewithspecifications,andprovidingdatafordesignpurposes.Fundamentalassumptionsinherentinthesetestmethodsarethatthetestspecimensarenotattackedbywater,thetestspecimensconformtotherequirementsforsize,configuration,andoriginalfaces,theopenporesofthetestspecimensarefullyimpregnatedwithwaterduringtheboilingtreatment,andtheblottingofthesaturatedtestspecimensisperformedasspecifiedinaconsistentanduniformmannertoavoidwithdrawingwaterfromthepores.Deviationfromanyoftheseassumptionsadverselyaffectsthetestresults.Inlaboratorystudiesinvolvingcastablespecimen,abiaswasnotedbetweenformed2by2by2x2013;in.(50by50by50x2013;mm)andspecimensthatwerequarteredfromlarger9by4.5by2.5(228by114by64mm)castspecimens.Additionally,anerrorintheapparentporositydeterminationoncastableswasfoundwheneverthespecimenswereheatedto1500x00B0;F(816x00B0;C)andthenexposedtowaterasasaturationmedia(TestMethodC830).Theerrorwasattributedtoreactivityofcementwithwaterandsubsequentre-hydrationofcementphases.Thehigherthecementlevelofthecastable,thegreatertheerrornoted.Itwasconcludedthatanerrorinporosityvaluescouldoccurforrefractorymaterialshavingapotentialtoformhydratedspecieswithwater.Certainprecautionsmustbeexercisedininterpretingandusingresultsfromthesetestmethods.Allfourpropertyvaluesareinterrelatedbyatleasttwoofthethreebasedatavaluesgeneratedduringtesting.Thus,anerrorinanybasedatavaluewillcauseanerrorinatleastthreeofthepropertyvaluesforagiventestspecimen.Certainoftheproperties,thatis,apparentspecificgravityandbulkdensity,arefunctionsofotherfactorssuchasproductcomposition,compositionalvariabilitywithinthesameproduct,imperviousporosity,andtotalporosity.Generalizationsonorcomparisonsofpropertyvaluesshouldonlybejudiciouslymadebetweenlikeproductstestedbythesetestmethodsorwithfullrecognitionofpotentiallyinherentdifferencesbetweentheproductsbeingcomparedorthetestmethodused.1.1Thesetestmethodscoverthedeterminationofthefollowingpropertiesofburnedrefractorybrick:1.1.1Apparentporosity,1.1.2Waterabsorption,1.1.3Apparentspecificgravity,and1.1.4Bulkdensity.1.2Thesetestmethodsarenotapplicabletorefractoriesattackedbywater.1.3Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q40
【国际标准分类号】:
【页数】:3P.;A4
【正文语种】:英语


【英文标准名称】:Measurementmicrophones-Part6:Electrostaticactuatorsfordeterminationoffrequencyresponse
【原文标准名称】:测量传声器.第6部分:频率响应的测定用静电致动器
【标准号】:IEC61094-6-2004
【标准状态】:现行
【国别】:国际
【发布日期】:2004-11
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/TC29
【标准类型】:()
【标准水平】:()
【中文主题词】:电声器件;电声学;环境效应;定义;规范(验收);致动器;静电装置;声学;测量扩音器;实验室器具;自由场;频率响应;静电的;声场;激励;试验;功能原则;电气工程;测量技术;电极;测量仪器;传声器;测量;校正
【英文主题词】:Acoustics;Acoustoelectricdevices;Actuator;Calibration;Definitions;Electricalengineering;Electroacoustics;Electrodes;Electrostatic;Electrostaticdevices;Environmentaleffect;Excitations;Freefields;Frequencyresponse;Functionprinciple;Laboratoryapparatus;Measurement;Measurementmicrophones;Measuringinstruments;Measuringtechniques;Microphones;Soundfields;Specification(approval);Testing
【摘要】:ThispartofIEC61094-givesguidelinesforthedesignofactuatorsformicrophonesequippedwithelectricallyconductivediaphragms;-givesmethodsforthevalidationofelectrostaticactuators;-givesamethodfordeterminingtheelectrostaticactu
【中国标准分类号】:N65
【国际标准分类号】:17_140_50;33_160_50
【页数】:62P;A4
【正文语种】:英语