ASTM D4543-2008 制备圆柱形岩心样品以及检验是否符合尺寸规格与形状公差的规程

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【英文标准名称】:StandardPracticesforPreparingRockCoreasCylindricalTestSpecimensandVerifyingConformancetoDimensionalandShapeTolerances
【原文标准名称】:制备圆柱形岩心样品以及检验是否符合尺寸规格与形状公差的规程
【标准号】:ASTMD4543-2008
【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】:D18.12
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:conformance;core;diameter;dimensionaltolerances;dimensions;length;rock;specimenpreparation(fortesting);specimenshape;specimensize;Conformance/conformityassessment;Diameter;Dimensions;Length;Rockmaterials/properties/analysis;
【摘要】:p>Thedimensional,shape,andsurfacetolerancesofrockcorespecimensareimportantfordeterminingrockpropertiesofintactspecimens.Thisisespeciallytrueforstrongrocks,greaterthan7250psi(50MPa).DimensionalandsurfacetolerancechecksarerequiredinthetestmethodslistedinSection2.1.Tosimplifytestproceduresinlaboratories,thepartsofthoseproceduresthatarecommontothetestmethodsinSection2.1aregiveninthisstandard.ThisprocedureisapplicabletoallthestandardslistedinSection2.1.However,specimensforTestMethodD2936donotneedtobemachinedortomeetthespecifiedtolerancesforflatnessandparallelism.Themoistureconditionofthespecimenatthetimeofthesamplepreparationcanhaveasignificanteffectuponthestrengthanddeformationcharacteristicsoftherock.Goodpracticegenerallydictatesthatlaboratorytestsbemadeuponspecimensrepresentativeoffieldconditions.Thus,itfollowsthatthefieldmoistureconditionofthespecimenshouldbepreserveduntilthetimeofthetest.Insomeinstances,however,theremaybereasonsfortestingspecimensatothermoisturecontents,fromsaturationtodry.Inanycase,themoisturecontentofthetestspecimenshouldbetailoredtotheproblemathand.Excessmoisturewillaffecttheadhesionofresistancestraingages,ifused,andtheaccuracyoftheirperformance.Adhesivesusedtobondtherocktosteelendpiecesinthedirecttensiontestwillalsobeaffectedadverselybyexcessmoisture.Note28212;Thequalityoftheresultproducedbythesepracticesisdependentuponthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetestingandsampling.UsersofthesepracticesarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thesepracticesspecifyproceduresforlaboratoryrockcoretestspecimenpreparationofrockcorefromdrillcoreandblocksamplesforstrengthanddeformationtestingandfordeterminingtheconformanceofthetestspecimendimensionswithtolerancesestablishedbythispractice.Cubical,rectangular,orothershapesarenotcoveredbythispractice.However,someoftheinformationcontainedwithinthispracticeandinstandardTestMethodC170maystillbeofusetopreparingothertestspecimenshapes.1.2Rockisacomplexengineeringmaterialthatcanvarygreatlyasafunctionoflithology,stresshistory,weathering,moisturecontentandchemistry,andothernaturalgeologicprocesses.Assuch,itisnotalwayspossibletoobtainorpreparerockcorespecimensthatsatisfythedesirabletolerancesgiveninthispractice.Mostcommonly,thissituationpresentsitselfwithweaker,moreporous,andpoorlycementedrocktypesandrocktypescontainingsignificantorweak(orboth)structuralfeatures.Fortheseandotherrocktypeswhicharedifficulttoprepare,allreasonableeffortsshallbemadetoprepareaspecimeninaccordancewiththispracticeandfortheintendedtestprocedure.However,whenithasbeendeterminedbytrialthatthisisnotpossible,preparetherockspecimentotheclosesttolerancespracticableandconsiderthistobethebesteffort(Note1)andreportitassuchandifallowableornecessaryfortheintendedtest,cappingtheendsofthespecimenasdiscussedinthispracticeispermitted.Note18212;Besteffortinsurfacepreparationreferstotheuseofawel......
【中国标准分类号】:P13
【国际标准分类号】:93_020
【页数】:9P.;A4
【正文语种】:英语