【英文标准名称】:Spacedataandinformationsystems.TC(telecommand)spacedatalinksprotocol
【原文标准名称】:空间数据和信息系统.TC(遥控命令)空间数据链协议
【标准号】:BSISO22664-2005
【标准状态】:作废
【国别】:英国
【发布日期】:2006-01-03
【实施或试行日期】:2006-01-03
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:空中交通管制;航空运输;编码(数据转换);数据连接系统;数据处理;数据传送;编码;飞行控制;信息交换;包交换网络;协议;无线电通信;遥控系统;信号传输;航天安全;航天运输;规范(验收);同步;遥测技术
【英文主题词】:Airtrafficcontrol;Airtransport;Coding(dataconversion);Datalinksystem;Dataprocessing;Datatransfer;Encoding;Flightcontrol;Informationinterchange;Packetswitchingnetworks;Protocols;Radiocommunication;Remotecontrolsystems;Signaltransmission;Spacesafety;Spacetransport;Specification(approval);Synchronization;Telemetry
【摘要】:ISO22664:2005specifiesthetelecommand(TC)spacedatalinkprotocol,adatalinklayerprotocolasdefinedinISO/IEC7498-1,thatistobeusedoverground-to-spaceorspace-to-spacecommunicationslinksbyspacemissions.
【中国标准分类号】:V07
【国际标准分类号】:49_140
【页数】:118P.;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforDeterminationofLengthChangeofConcreteDuetoAlkali-SilicaReaction
【原文标准名称】:由于碱-硅反应引起的混凝土长度变化测定的标准试验方法
【标准号】:ASTMC1293-2008b
【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】:C09.26
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:aggregate;alkali-silicareactivity;concrete;lengthchange;pozzolan;slag;Aggregate(potentialalkalireactivity);Changeinlength;Concreteaggregates;Expansivealkali-silicareactivity;Silica
【摘要】:Alkali-silicareactionisachemicalinteractionbetweensomesiliceousconstituentsofconcreteaggregatesandhydroxylions(1).Theconcentrationofhydroxylionwithintheconcreteispredominantlycontrolledbytheconcentrationofsodiumandpotassium(2).Thistestmethodisintendedtoevaluatethepotentialofanaggregateorcombinationofanaggregatewithpozzolanorslagtoexpanddeleteriouslyduetoanyformofalkali-silicareactivity(3,4).Whentestinganaggregatewithpozzolanorslag,theresultsareusedtoestablishminimumamountsofthespecificpozzolanorslagneededtopreventdeleteriousexpansion.Pozzolanorslagfromaspecificsourcecanbetestedindividuallyorincombinationwithpozzolanorslagfromothersources.Whenselectingasampleordecidingonthenumberofsamplesfortest,itisimportanttorecognizethevariabilityinlithologyofmaterialfromagivensource,whetheradepositofsand,gravel,orarockformationofanyorigin.Forspecificadvice,seeGuideC295.Thistestmethodisintendedforevaluatingthebehaviorofaggregatesinportlandcementconcretewithanalkali(alkalimetaloxide)contentof5.25kg/m3orinconcretecontainingpozzolanorslagwithanalkalicontentproportionallyreducedfrom5.25kg/m3Na2Oequivalentbytheamountofpozzolanorslagreplacingportlandcement.Thistestmethodassessesthepotentialfordeleteriousexpansionofconcretecausedbyalkali-silicareaction,ofeithercoarseorfineaggregates,fromtestsperformedunderprescribedlaboratorycuringconditionsthatwillprobablydifferfromfieldconditions.Thus,actualfieldperformancewillnotbeduplicatedduetodifferencesinconcretealkalicontent,wettinganddrying,temperature,otherfactors,orcombinationsofthese(5).Resultsoftestsconductedonanaggregateasdescribedhereinshouldformapartofthebasisforadecisionastowhetherprecautionsshouldbetakenagainstexcessiveexpansionduetoalkali-silicareaction.Resultsoftestsconductedoncombinationsofanaggregatewithpozzolansorslagshouldformapartofthebasisforadecisionastowhetherthespecificpozzolanorslag,whenusedintheamounttested,waseffectiveinpreventingexcessiveexpansion.Thesedecisionsshouldbemadebeforeaparticularaggregateisusedinconcreteconstruction.CriteriatodeterminethepotentialdeleteriousnessofexpansionsmeasuredinthistestaregiveninAppendixX1.WhentheexpansionsinthistestmethodaregreaterthanthelimitshowninX1.2,theaggregateorcombinationofaggregatewiththetestedamountofpozzolanorslagispotentiallyalkali-reactive.Supplementalinformationshouldbedevelopedtoconfirmthattheexpansionisactuallyduetoalkali-silicareaction.PetrographicexaminationoftheconcreteprismsshouldbeconductedafterthetestusingPracticeC856toconfirmthatknownreactiveconstituentsarepresentandtoidentifytheproductsofalkali-silicareactivity.Confirmationofalkali-silicareactionisalsoderivedfromtheresultsofthetestmethodsthisproceduresupplements(seeAppendixX1).Ifthesupplementaltestsshowthatagivenaggregateispotentiallydeleteriouslyreactive,additionalstudiesmaybeappropriatetoevaluatepreventivemeasuresinordertoallowsafeuseoftheaggregate.PreventivemeasuresarementionedintheAppendixtoSpecificationC33.Thistestmethoddoesnotaddressthegeneralsuitabilityofpozzolansorslagforuseinconcrete.ThesematerialsshouldcomplywithSpecificationC618,SpecificationC989,orSpecificationC1240.