ANSI/NSF 14(i27)-2009 塑料管道系统部件及其相关材料

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【英文标准名称】:StandardTestMethodforDeterminingAgeatCrackingandInducedTensileStressCharacteristicsofMortarandConcreteunderRestrainedShrinkage
【原文标准名称】:测定限制收缩下的灰浆和混凝土断裂老化和诱导拉伸应力特性的标准试验方法
【标准号】:ASTMC1581-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:C09.68
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Cracking;restrainedshrinkage;ringtest;shrinkage;tensilestress
【摘要】:Thistestmethodisforrelativecomparisonofmaterialsandisnotintendedtodeterminetheageatcrackingofmortarorconcreteinanyspecifictypeofstructure,configuration,orexposure.Thistestmethodisapplicabletomixtureswithaggregatesof0.5-in.(13-mm)maximumnominalsizeorless.Thistestmethodisusefulfordeterminingtherelativelikelihoodofearly-agecrackingofdifferentcementitiousmixturesandforaidingintheselectionofcement-basedmaterialsthatarelesslikelytocrackunderretrainedshrinkage.Actualcrackingtendencyinservicedependsonmanyvariablesincludingtypeofstructure,degreeofrestraint,rateofpropertydevelopment,constructionandcuringmethods,andenvironmentalconditions.Thistestmethodcanbeusedtodeterminetherelativeeffectsofmaterialvariationsoninducedtensilestressesandcrackingpotential.Thesevariationscaninclude,butarenotlimitedto,aggregatesource,aggregategradation,cementtype,cementcontent,watercontent,supplementarycementingmaterials,orchemicaladmixtures.Formaterialsthathavenotcrackedduringthetest,therateoftensilestressdevelopmentatthetimethetestisterminatedprovidesabasisforcomparisonofthematerials.1.1Thistestmethodcoversthelaboratorydeterminationoftheageatcrackingandinducedtensilestresscharacteristicsofmortarorconcretespecimensunderrestrainedshrinkage.Theprocedurecanbeusedtodeterminetheeffectsofvariationsintheproportionsandmaterialpropertiesofmortarorconcreteoncrackingduetobothdryingshrinkageanddeformationscausedbyautogenousshrinkageandheatofhydration.1.2Thistestmethodisnotintendedforexpansivematerials.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesshowninparenthesisareinSIunitsandaregivenforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.(Warning-Freshhydrauliccementitiousmixturesarecausticandmaycausechemicalburnstoskinandtissueuponprolongedexposure.)
【中国标准分类号】:Q13
【国际标准分类号】:91_100_30
【页数】:6P.;A4
【正文语种】:


【英文标准名称】:Informationtechnology;telecommunicationsandinformationexchangebetweensystems;OSIrouteingframework
【原文标准名称】:信息技术.系统间的电信和信息交换.开放系统互连路径选择结构
【标准号】:ISO/IECTR9575-1990
【标准状态】:作废
【国别】:国际
【发布日期】:1990-06
【实施或试行日期】:1990-06-01
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/IEC/JTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:信息交换;网络互连;通信规程;开式系统互连;数据处理;信息交流;电信;信息处理
【英文主题词】:informationexchange;telecommunication;networkinterconnection;dataprocessing;informationprocessing;telecommunications;osi;communicationprocedure;communicationprocedures;informationinterchange;opensystemsinterconnection
【摘要】:
【中国标准分类号】:L79
【国际标准分类号】:
【页数】:12P;A4
【正文语种】:英语