ASTM C1399-2007a 获得纤维增强混凝土的平均残余强度用标准试验方法

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【英文标准名称】:StandardTestMethodforObtainingAverageResidual-StrengthofFiber-ReinforcedConcrete
【原文标准名称】:获得纤维增强混凝土的平均残余强度用标准试验方法
【标准号】:ASTMC1399-2007a
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:C09.42
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:混凝土强度;混凝土;纤维增强的;试验
【英文主题词】:fiber-reinforcedconcrete;residualstrength;flexuretesting;postcrackingstrength
【摘要】:Thistestmethodprovidesaquantitativemeasureusefulintheevaluationoftheperformanceoffiberx2013;reinforcedconcrete.Itallowsforcomparativeanalysisamongbeamscontainingdifferentfibertypes,includingmaterials,dimensionandshape,anddifferentfibercontents.Resultscanbeusedtooptimizetheproportionsoffiberx2013;reinforcedconcretemixtures,todeterminecompliancewithconstructionspecifications,toevaluatefiberx2013;reinforcedconcretewhichhasbeeninservice,andasatoolforresearchanddevelopmentoffiberx2013;reinforcedconcrete(SeeNote2).Note28212;BanthiaandDubey3comparedresultsusingthistestmethodwithresidualstrengthsatthesamenetdeflectionsusingatestprotocolthatissimilartothatdescribedinTestMethodC1609/C1609Mon45beamswithasinglefiberconfigurationatproportionsof0.1,0.3,and0.5%byvolume.Theresultsbythistestmethodwereonaverage6.4%lowerthanbytheprocedureofTestMethodC1609/C1609M.Testresultsareintendedtoreflecteitherconsistencyordifferencesamongvariablesusedinproportioningthefiberx2013;reinforcedconcretetobetested,includingfibertype(material),fibersizeandshape,fiberamount,beampreparation(sawedormolded),andbeamconditioning.Inmoldedbeamsfiberorientationnearmoldedsurfaceswillbeaffectedbytheprocessofmolding.Fortestsoffiber-reinforcedconcretecontainingrelativelyrigidorstifffibersoflengthgreaterthan40mm(1.5in.),theuseofsawedbeamscutfromsampleswithaninitialwidthanddepthofatleast3timesthelengthofthefiberisrequiredtominimizeeffectsoffiberorientation.Whensawedbeamsareemployed,andtoavoidtheeffectsoffiberorientation,careshallbeappliedtoensurethattheflexuraltensilesurfaceofthebeamisasawedsurface.1.1Thistestmethodcoversthedeterminationofresidualstrengthofafiber-reinforcedconcretetestbeam.Theaverageresidualstrengthiscomputedusingspecifiedbeamdeflectionsthatareobtainedfromabeamthathasbeencrackedinastandardmanner.Thetestprovidesdataneededtoobtainthatportionoftheload-deflectioncurvebeyondwhichasignificantamountofcrackingdamagehasoccurredanditprovidesameasureofpost-crackingstrength,assuchstrengthisaffectedbytheuseoffiber-reinforcement.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.
【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】: