【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/C1581M-2009a
【标准状态】:现行
【国别】:
【发布日期】:2009
【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】:裂开
【英文主题词】:Cracking;restrainedshrinkage;ringtest;shrinkage;tensilestress;Concrete;Cracking;Mortar;Ringtestprocedures;Shrinkage;Tensilestrength/stress
【摘要】:Thistestmethodisforrelativecomparisonofmaterialsandisnotintendedtodeterminetheageatcrackingofmortarorconcreteinanyspecifictypeofstructure,configuration,orexposure.Thistestmethodisapplicabletomixtureswithaggregatesof13-mm[0.5-in.]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.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.(Warningx2014;Freshhydrauliccementitiousmixturesarecausticandmaycausechemicalburnstoskinandtissueuponprolongedexposure.)
【中国标准分类号】:
【国际标准分类号】:91_100_30
【页数】:7P.;A4
【正文语种】: