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【英文标准名称】:StandardTestMethodforLaboratoryDeterminationofAbrasivenessofRockUsingtheCERCHARMethod
【原文标准名称】:使用CERCHAR法在实验室内测定石材的磨蚀性的标准试验方法
【标准号】:ASTMD7625-2010
【标准状态】:现行
【国别】:美国
【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】:D18.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:abrasiveness;abrasivity;CERCHAR;diskcutter;mechanicalexcavation;RockwellHardness;TBM
【摘要】:TheCERCHARtestandassociatedCAIweredevelopedatatimeofmoredemandforapplicationofmechanicalexcavationmachinesattheLaboratoireduCenterd''?/span>tudesetRecherchesdesCharbonnagesdeFrance(CERCHAR)(3).CAIisusedtoassesstheabrasivenessofrockformechanicalexcavation.Rockabrasivenessgovernstheperformanceofdisccutters,therateofitsreplacementandthereforesubsequenttunnelcosts.Advancesinmethodsofundergroundexcavation,inparticulartheuseofthetunnelboringmachine(TBM),necessitatesknowledgeofrockabrasiveness.Abrasivenessexpressesabehavioralcharacteristicofrockratherthanafundamentalphysicalormechanicalproperty.CAItestswereoriginallycarriedoutonnaturalbrokensurfaces.Inheterogeneousrocktypessuchasconglomerates,coarsegrainedgraniteorschistoserock,suitablefreshtestsurfacesarenotachievedbymechanicalbreakageusingahammer.InthesecasesCAIvaluesforx201C;smoothx201D;surfacescutwithadiamondsawareacceptableforusebutshallbenormalizedbyEq2beforetheycanbeused(1).ThetestvelocityfortheOriginalCercharapparatusisapproximately10mm/sand1mm/sfortheWestCercharapparatus.TheCAIvaluesobtainedforbothtestingvelocities(1)areestimatedtobeequal.Note18212;Thequalityoftheresultproducedbythesepracticesisdependentuponthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetestingandsampling.UsersofthesepracticesarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1ThistestmethodcoversthedeterminationoftheabrasivenessofrockbytheCERCHARAbrasivenessIndex(CAI)method.ThetestmethodconsistsofmeasuringthewearonthetipofsteelstyluswithaconeshapeandknownRockwellHardness,causedbyscratchingagainstafreshlybrokenorsawcutrocksurfaceforaprescribed10mmdistanceusingoneofthetwotestapparatus.1.2Thistestmethodisintendedforfreshlybrokenrocksurfaces;however,sawcutsurfacesarecoveredforwhenasatisfactoryrocksurfacecannotbeobtained.1.3StylusRockwellHardness(HRC)canhaveaprofoundeffectontheresultsandthefocusofthistestmethodisanHRCvalueof55foreverytest(1,2).However,therearesituationswherestyluswithdifferentRockwellHardnesscanbeusedTherefore,thistestmethodincludesdiscussionsonstyluswithdifferentRockwellHardness.1.4AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthprac......
【中国标准分类号】:Q21
【国际标准分类号】:91_100_15
【页数】:6P.;A4
【正文语种】:英语