ASTM C156-2009a 混凝土用液膜养护材料的失水率【砂浆试件】的标准试验方法

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【英文标准名称】:StandardTestMethodforWaterLoss[fromaMortarSpecimen]ThroughLiquidMembrane-FormingCuringCompoundsforConcrete
【原文标准名称】:混凝土用液膜养护材料的失水率【砂浆试件】的标准试验方法
【标准号】:ASTMC156-2009a
【标准状态】:现行
【国别】:美国
【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】:C09.22
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:concretecuringmaterials;liquidmembrane-formingcuringcompounds;moistureretentionbyconcretecuringmaterials;Compound(curing);Curing(ofconcrete);Film;Liquidmembrane-formingcompounds;Sheetandfilm;Waterretention
【摘要】:Themoistureretainingabilityofaproductasdeterminedbythistestmethodisusedtoassessthesuitabilityofmaterialsforcontributingtoanappropriatecuringenvironmentforconcrete.Thelaboratorytestmethodisusedbothinformulatingandinspecifyingorqualifyingcuringproducts.Thistestmethodgivestheuserameasureoftheabilityoftestedcuringmaterialstoimpedetheescapeofmoisturefromahydrauliccementmortar.Sinceitisdesirabletoretainmoistureinfreshconcretetopromotethehydrationprocess,failureoftheproducttominimizetheescapeofmoisturemayleadtolossofstrength,cracking,shrinkage,orlowabrasionresistanceofthehardenedconcrete,oracombinationthereof.Manyfactorsaffectthelaboratorytestresults.Testresultsobtainedmaybehighlyvariableasindicatedbytheprecisionstatement.Criticalfactorsincludetheprecisionofthecontrolofthetemperature,humidityandaircirculationinthecuringcabinet,preparationandsealingofthemortarspecimens,theageandsurfaceconditionofthemortarspecimenwhenthecuringproductisapplied,andtheuniformityandquantityofapplicationofthecuringmembrane.1.1Thistestmethodcoverslaboratorydeterminationoftheefficiencyofliquidmembrane-formingcompoundsforcuringconcrete,asmeasuredbytheirabilitytoreducemoisturelossduringtheearlyhardeningperiod.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.(Warning8212;Freshhydrauliccementitiousmixturesarecausticandmaycausechemicalburnstoskinandtissueuponprolongedexposure.)
【中国标准分类号】:Q13
【国际标准分类号】:91_100_30
【页数】:5P.;A4
【正文语种】:英语