ASTM D7115-2010 使用模拟载荷测定回转内角的高性能沥青路面回转式夯实机(SGC)测量的标准试验方法

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【英文标准名称】:StandardTestMethodforMeasurementofSuperpaveGyratoryCompactor(SGC)InternalAngleofGyrationUsingSimulatedLoading
【原文标准名称】:使用模拟载荷测定回转内角的高性能沥青路面回转式夯实机(SGC)测量的标准试验方法
【标准号】:ASTMD7115-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:D04.20
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:angle;asphalt;bituminous;compaction;gyratory;Superpav;Compactionmeasurement;Gyratorycompactor;Hot-mixasphalt(HMA);Superpavegyratorycompactor
【摘要】:SGCsareusedtoproducehot-mixasphalt(HMA)specimensinthelaboratorytoassessvolumetricpropertiesandpredictpavementperformance.InthefabricationofanSGCspecimeninaccordancewithTestMethodD6925,looseHMAisplacedinsideametalmold,whichisthenplacedintoanSGC.Aconstantconsolidationpressureisappliedtothesamplewhilethemoldgyratesatanominallyconstantangle(referredtoastheangleofgyration)andrate.ConsistencyinthedensityoftheasphaltspecimensproducedasmeasuredbyTestMethodsD2726orD6752isveryimportanttothevalidityofthetestsperformed.SpecimensofaconsistentdensityareproducedwhenanSGCmaintainsaconstantpressureandaknownconstantangleofgyrationduringthecompactionprocess.ThereareseveralmanufacturersandmodelsofSGC.Eachmodelemploysauniquemethodofsetting,inducing,andmaintainingtheangleofgyration.Eachmodelalsoemploysauniquecalibrationsystemtomeasuretheexternalangleofgyration.TheseexistingcalibrationsystemscannotbeuseduniversallyonallofthedifferentSGCmodelscommerciallyavailable.InconsistenciesinasphaltspecimensproducedondifferentSGCmodelshavebeenatleastpartiallyattributedtovariationsintheangleofgyration.Thismethoddescribesinstrumentsandprocessesthatcanbeusedtoindependentlymeasuretheinternalangleofgyrationofanymanufacturersx2019;SGCmodelundersimulatedloadingconditions.Theexternalshapeoftheinstrumentchassisassuresthatthepointsofphysicalcontactbetweenthemoldendplatesandtheinstrumentoccuratafixedandknowndistanceawayfromtheaxisofgyration.Asaresult,theverticalloadisappliedatthesefixedpoints,creatingtiltingmomentsateachendofthemold.Unlessotherwisespecified,atiltingmomentof466.5N-mshallbeappliedtotheSGCbytheinstrumentwhilemakingthismeasurement.Note18212;Thequalityoftheresultsproducedbythistestmethodaredependentonthecompetenceofthepersonnelperformingtheprocedureandthecapability,calibration,andmaintenanceoftheequipmentused.AgenciesthatmeetthecriteriaofPracticeD3666aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3666alonedoesnotcompletelyassurereliableresults.Reliableresultsdependonmanyfactors;followingthesuggestionsofPracticeD3666orsomesimilaracceptableguidelineprovidesameansofevaluatingandcontrollingsomeofthosefactors.Note28212;A466.5N-mtiltingmomentcorrespondstoa22mmeccentricontheAFLS1ora21degconeangleontheDAVII-HMSwithanappliedloadof10603N(600kPaata150mmdiameterspecimensetting).1.1ThistestmethodcoverstheprocedureforthemeasurementoftheSuperpaveGyratoryCompactor(SGC)internalangleofgyrationusinganinstrumentcapableofsimulatingloadingconditionssimilartothosecreatedbyahotmixasphaltspecimen.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.2.1