ASTM D2950-2009 采用核子法现场测定沥青混凝土密度的标准方法

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【英文标准名称】:StandardTestMethodforDensityofBituminousConcreteinPlacebyNuclearMethods
【原文标准名称】:采用核子法现场测定沥青混凝土密度的标准方法
【标准号】:ASTMD2950-2009
【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】:D04.21
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bituminous-concretedensity;density;in-placedensity;nucleartestmethod;Concrete;Density--pavingmaterials;Gammaradiation--soil/rock;Neutronradiation--concrete;Nuclearmethods
【摘要】:Thetestmethoddescribedisusefulasarapid,nondestructivetechniquefordeterminingthein-placedensityofcompactedbituminousmixtures.Withpropercalibrationandconfirmationtesting,thetestmethodissuitableforqualitycontrolandacceptancetestingofcompactedbituminousconcrete.Thetestmethodcanbeusedtoestablishtheproperrollingeffortandpatterntoachievetherequireddensity.Thenon-destructivenatureofthetestallowsrepetitivemeasurementstobemadeatasingletestlocationbetweenrollerpassesandtomonitorchangesindensity.Thedensityresultsobtainedbythistestmethodarerelative.CorrelationwithothertestmethodssuchasD1188orD2726arerequiredtoconverttheresultsobtainedusingthismethodtoactualdensity.Itisrecommendedthatatleastsevencoredensitiesandsevennucleardensitiesbeusedtoestablishaconversionfactor.Anewfactormustbeestablishedatanytimeachangeismadeinthepavingmixtureorintheconstructionprocess.1.1Thistestmethoddescribesatestprocedurefordeterminingthedensityofbituminousconcretebytheattenuationofgammaradiation,wherethesourceanddetector(s)remainonthesurface(BackscatterMethod)orthesourceordetectorisplacedataknowndepthupto300mm(12in.)whilethedetectororsourceremainsonthesurface(DirectTransmissionMethod).1.2Thedensity,inmassperunitvolumeofthematerialundertest,isdeterminedbycomparingthedetectedrateofgammaemissionswithpreviouslyestablishedcalibrationdata.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.ForspecificwarningstatementsseeSection6andNote4.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundequivalentsmaybeapproximate.
【中国标准分类号】:E43
【国际标准分类号】:93_080_10
【页数】:5P.;A4
【正文语种】:英语