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【英文标准名称】:StandardTestMethodforMeasuringBulkDensityValuesofPowdersandOtherBulkSolidsasFunctionofCompressiveStress
【原文标准名称】:测量粉末和其他散装固体松密度的标准试验方法.压应力的作用
【标准号】:ASTMD6683-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D18.24
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bulkdensity;bulksolids;compressivestress;powder;Bulkdensity;Bulksolids;Compactionpressure;Powders;Silos
【摘要】:Thedatafromthistestcanbeusedtoestimatethebulkdensityofmaterialsinbinsandhoppersandformaterialhandlingapplicationssuchasfeeders.Thetestresultscanbegreatlyaffectedbythesampleselectedfortesting.Formeaningfulresultsitisnecessarytoselectarepresentativesampleoftheparticulatesolidwithrespecttomoisture(water)content,particle-sizedistributionandtemperature.Forthetestsanappropriatesizesampleshouldbeavailable,andfreshmaterialshouldbeusedforeachindividualtestspecimen.Initialbulkdensity,(x03C1;b)initial,mayormaynotbeusedastheminimumbulkdensity.Thiswilldependonthematerialbeingtested.Forexample,thetwoareoftenclosetothesameforcoarse(mostparticleslargerthanabout6mm),free-flowingbulksolids,butnotforfine,aeratablepowders.Bulkdensityvaluesmaybedependentuponthemagnitudeoftheappliedmassincrements.Traditionally,theappliedmassisdoubledforeachincrementresultinginanappliedmassincrementratioof1.Smallerthanstandardincrementratiosmaybedesirableformaterialsthatarehighlysensitivetotheappliedmassincrementratio.Anexampleofthelatterisamaterialwhosebulkdensityincreases10%ormorewitheachincreaseinappliedmass.Bulkdensityvaluesmaybedependentuponthedurationofeachappliedmass.Traditionally,thedurationisthesameforeachincrementandequalto15s.Forsomematerials,therateofcompressionissuchthatcompletecompression(nochangeinvolumewithtimeatagivenappliedcompressivestress)willrequiresignificantlymorethan15s.Note18212;Thequalityoftheresultproducedbythisstandardisdependentonthecompetenceofpersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.PracticeD3740wasdevelopedforagenciesengagedinthetestingorinspection(orboth)ofsoilandrock.Assuchitisnottotallyapplicabletoagenciesperformingthisstandard.However,usersofthisstandardshouldrecognizethattheframeworkofPracticeD3740isappropriateforevaluatingthequalityofanagencyperformingthisstandard.Currentlythereisnoknownqualifyingnationalauthoritythatinspectsagenciesthatperformthisstandard.1.1Thistestmethodcoversanapparatusandprocedurefordeterminingarangeofbulkdensitiesofpowdersandotherbulksolidsasafunctionofcompressivestress.1.2Thistestmethodshouldbeperformedinthelaboratoryundercontrolledconditionsoftemperatureandhumidity.1.3AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.3.1Theproceduresusedtospecifyhowdataarecollected/recordedorcalculatedinthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatgenerallyshouldberetained.Theproceduresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsiderationsfortheuserx2019;sobjectives,anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththesecon......
【中国标准分类号】:A42
【国际标准分类号】:19_120
【页数】:5P.;A4
【正文语种】:英语