【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


【英文标准名称】:Pipesandfittingsofunplasticizedpoly(vinylchloride)(PVC-U)forducting-Dimensionsandtechnicaldeliveryconditions
【原文标准名称】:未增塑聚氯乙烯(PVC-U)保护管和配件.尺寸和交货技术条件
【标准号】:DIN16875-1998
【标准状态】:现行
【国别】:德国
【发布日期】:1998-01
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:地下;作标记;定义;未增塑聚氯乙烯;未增塑聚氯乙烯;地下装置;检验;尺寸;电缆保护;规范(验收);聚氯乙烯;材料;管;管连接件;交货条件;管道;配件;塑料;特性;塑料管道;管道配件;试验;保护管
【英文主题词】:
【摘要】:Thedocumentspecifiespipesandfittingsofunplasticizedpoly(vinylchloride)(PVC-U)forducting.
【中国标准分类号】:J15;G33
【国际标准分类号】:83_140_30
【页数】:8P;A4
【正文语种】:德语