【英文标准名称】:StandardPracticeforEstimatingConcreteStrengthbytheMaturityMethod
【原文标准名称】:成熟度法估计混凝土强度的标准实施规程
【标准号】:ASTMC1074-2011
【标准状态】:现行
【国别】:
【发布日期】:2011
【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】:C09.64
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:现场强度;成熟度法;无损检测;温度;冷凝混凝土;混凝土;混凝土强度
【英文主题词】:in-placestrength;maturitymethod;nondestructivetesting;temperature;Cold-weatherconcrete;Concrete;Concretestrength
【摘要】:Thispracticecanbeusedtoestimatethein-placestrengthofconcretetoallowthestartofcriticalconstructionactivitiessuchas:(1)removalofformworkandreshoring;(2)post-tensioningoftendons;(3)terminationofcoldweatherprotection;and(4)openingofroadwaystotraffic.Thispracticecanbeusedtoestimatestrengthoflaboratoryspecimenscuredundernon-standardtemperatureconditions.Themajorlimitationsofthematuritymethodare:(1)theconcretemustbemaintainedinaconditionthatpermitscementhydration;(2)themethoddoesnottakeintoaccounttheeffectsofearly-ageconcretetemperatureonthelong-termstrength;and(3)themethodneedstobesupplementedbyotherindicationsofthepotentialstrengthoftheconcretemixture.Theaccuracyoftheestimatedstrengthdepends,inpart,onusingtheappropriatematurityfunctionfortheparticularconcretemixture.AnnexA1providesaprocedurefordeterminingexperimentallythebestparameters(datumtemperatureorvalueofQ)forthematurityfunctionsdescribedinSection6.1.1Thispracticeprovidesaprocedureforestimatingconcretestrengthbymeansofthematuritymethod.Thematurityindexisexpressedeitherintermsofthetemperature-timefactororintermsoftheequivalentageataspecifiedtemperature.1.2Thispracticerequiresestablishingthestrength-maturityrelationshipoftheconcretemixtureinthelaboratoryandrecordingthetemperaturehistoryoftheconcreteforwhichstrengthistobeestimated.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.(WarningFreshhydrauliccementitiousmixturesarecausticandmaycausechemicalburnstoskinandtissueuponprolongedexposure.)
【中国标准分类号】:
【国际标准分类号】:91_100_30
【页数】:10P.;A4
【正文语种】: