【英文标准名称】:StandardTestMethodforDeterminingtheComplexShearModulus(G*)OfBituminousMixturesUsingDynamicShearRheometer
【原文标准名称】:使用动力剪切流变仪测定沥青混合料的复数切变模量(G*)的标准试验方法
【标准号】:ASTMD7552-2009
【标准状态】:现行
【国别】:
【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】:D04.26
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bituminousmixture;complexshearmodulus;DSR;dynamicshearrheometer;torsionrectangularspecimen
【摘要】:Thecomplexshearmodulusofbituminousmixturesisafundamentalpropertyofthematerial.Testresultsatcriticaltemperatures(Tcritical)areusedforspecificationsforsomemixes.Mixtureswithstifferbinders,agedmixtures,mixtureswithhigheramountsoffines(materialfinerthan75x00B5;),andmixtureswithlowervoidsalltendtohavehighercomplexshearmodulusvaluesthanmixtureswithlessstiffbinders,unagedmixes,mixtureswithlowlevelsoffinesandhigherairvoids.Ingeneral,mixtureswithhighercomplexshearmodulusvaluesatagivenservicetemperaturewillexhibitlowerpermanentdeformationvaluesthansimilarmixturestestedatthesametemperaturethathavelowercomplexshearmodulusvalues.Note28212;Thequalityoftheresultsproducedbythisstandardaredependentonthecompetenceofthepersonnelperformingtheprocedureandthecapability,calibration,andmaintenanceoftheequipmentused.AgenciesthatmeetthecriteriaofStandardPracticeD3666aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthisstandardarecautionedthatcompliancewithD3666alonedoesnotcompletelyassurereliableresults.Reliableresultsdependonmanyfactors;followingthesuggestionsofD3666orsomesimilaracceptableguidelineprovidesameansofevaluatingandcontrollingsomeofthosefactors.1.1Thistestmethodcoversthedeterminationofthecomplexshearmodulusofbituminousmixturesusingtorsionrectangulargeometryonadynamicshearrheometer(DSR).Itisapplicabletobituminousmixtureshavingcomplexshearmodulusvaluesgreaterthan1x00D7;104Pawhentestedoverarangeoftemperaturesfrom10x00B0;Cto76x00B0;Catfrequenciesof0.01to25Hzandstrainsof0.001%to0.1%.Thedeterminationofcomplexshearmodulusistypicallydeterminedat20x00B0;Cto70x00B0;Cat0.01%strainat10discretefrequencyvaluescovering0.01to10Hz.Fromthesedata,temperatureorfrequencymastercurvescanbegeneratedasrequired.Thistestmethodisintendedfordeterminingthecomplexshearmodulusofbituminousmixturesasrequiredforspecificationtestingorqualitycontrolofbituminousmixtureproduction.1.2Thistestmethodisappropriateforlaboratorypreparedandcompactedmixtures,fieldproducedandlaboratorycompactedmixturesorfieldcores,regardlessofbindertypeorgradeandregardlessofwhetherRAPisusedinthemixture.Duetothegeometryofthespecimensbeingtestedthistestmethodisnotapplicabletoopen-gradedorSMAmixtures.Ithasbeenfoundtobeappropriatefordense-gradedmixtures,whethercoarse-orfine-graded,with19mmorsmallernominalmaximumaggregatesize.1.3Thebetween-laboratoryreproducibilityofthistestmethodisbeingdeterminedandwillbeavailableonorbeforeJune2012.Therefore,thistestmethodshouldnotbeusedforacceptanceorrejectionofmaterialsforpurchasingpurposes.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:
【国际标准分类号】:75_140;91_100_50
【页数】:11P.;A4
【正文语种】: