ASTM C802-2009a 为确定建筑材料试验方法精确度而实行实验室间试验程序的标准实施规程

作者:标准资料网 时间:2024-05-19 06:09:09  浏览:8382   来源:标准资料网

【英文标准名称】:StandardPracticeforConductinganInterlaboratoryTestProgramtoDeterminethePrecisionofTestMethodsforConstructionMaterials
【原文标准名称】:为确定建筑材料试验方法精确度而实行实验室间试验程序的标准实施规程
【标准号】:ASTMC802-2009a
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:C09.94
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:Constructionmaterials;Interlaboratorytesting--constructionmaterials;Precision--constructionmaterialstestmethods;Testingandinspectionagencies--cement/concrete
【摘要】:Certaincriterianeedtobemetbeforeundertakinganinterlaboratorystudytodeterminetheprecisionofatestmethod.Itisnotnecessarythatallofthefollowingconditionsdescribedbecompletelyfulfilledineverycase;however,ifsomeconditionsarenotmetoraremetincompletely,theprogramwillbecomemorecomplicatedandrequiremoreworkandexpense,ormayresultinimpairedinformation.Therecommendationsoutlinedinthissectionareintendedtoensurethatthetestmethodisfreeoftechnicaldifficultiestothegreatestextentpossiblebeforeanexpensiveandtime-consuminginterlaboratorystudyisundertaken.Thefirstrequirementistheexistenceofavalidandwell-writtentestmethodthathasbeendevelopedinonecompetentlaboratory(orbycooperativeworkinasmallnumberoflaboratories),andhasbeensubjectedtoascreeningprocedure,ortoruggednesstestingasdescribedinPracticeC1067.Asaresultofthescreeningprocedureandsomeexperiencewiththetestmethodinthesponsoringlaboratoryandoneortwoothers,awrittenversionofthetestmethodhasbeendeveloped(butnotnecessarilypublishedasastandardmethod)thatdescribesthetestprocedureintermsthatcaneasilybefollowedinanyproperlyequippedlaboratory.Conditionsthataffectthetestresultsshouldbeidentifiedandtheproperdegreeofcontrolofthoseconditionsshouldbespecifiedinthedescriptionofthetestprocedure(seeNote1).Note18212;Thedesireddegreeofcontrolofconditionsthataffecttestresultsmaynotalwaysbepracticallyachievable,andtolerancesinthetestmethodshouldrecognizethisfact.Variationsintestresultsduetovariationsinsuchconditionscontributetothetotalvariationwhichdeterminestheprecisionofthetestmethod.Iftheresultingvariationissogreatthatuncertaintiesinaveragevaluesobtainedbythetestmethodareunacceptablyhigh,thenthetestmethoditselfisatfault,andeffortsshouldbemadetoimproveitortoreplaceitbyabetterone.Anexpensiveandtime-consuminginterlaboratorystudyshouldnotbeundertakenonsuchatestmethod.Anyapparatusrequiredforperformingthetestshouldbeappropriatelydesignedandavailableatreasonablecost.Personnelinparticipatinglaboratoriesshouldhaveenoughexperiencewiththetestmethodsothattheyarecompetenttorunthetest.Theimportanceofthisrequirementwillvarywiththecomplexityofthemethodandthedegreetowhichitdepartsfromfamiliarprocedures.Preliminaryknowledgeshouldexistabouthowchangesinmaterialsandconditionsaffectthetestresults.Thereshouldbeareasonabledegreeofcertaintythatthewithin-laboratoryvariancesarethesameindifferentlaboratories,andthattroublesomeinteractionsdonotexist.Theseconditionsareinvestigatedintheanalysisofthedataofaninterlaboratorystudy,andarediscussedfurtherin8.2.2,8.2.3,andAppendixX1.Facilitiesandproceduresforprocurement,preparation,anddistributionofsamplesmustbeavailableandshouldbeassimpleandfreeofdifficultiesaspracticable.Selectionofsamplesmustbedonebyarandomizationprocess,andonepersonwhoisfamiliarwithrandomizationproceduresshouldberesponsibleforseeingthattheprocedureiscarriedout.RefertoRecommendedPracticeE105.Adequatenumbersofparticipatinglaboratories,operators,andmaterialsmustbeavailable.RequirementsintheseareasarespecifiedinSections4and5.Theentireinterlaboratorytestprogramshouldbedevelopedfromthebeginningwiththehelpandadviceofpersonsfamiliarwithstatisticalproceduresandwiththemate.......
【中国标准分类号】:Q10
【国际标准分类号】:91_100_01
【页数】:18P.;A4
【正文语种】:英语