【英文标准名称】:StandardPracticeforAcceleratedAgingofAsphaltBinderUsingaPressurizedAgingVessel(PAV)
【原文标准名称】:用加压老化容器(PAV)进行沥青粘结剂加速老化的标准实施规程
【标准号】:ASTMD6521-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D04.46
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:acceleratedaging;elevatedtemperature;in-serviceaging;PAV;pressureaging;pressureagingvessel;vacuumdegassing;Acceleratedaging/testing;Aging;Asphaltbinder;PAV(pressurizedagingvessel);Pressureagingvessel(PAV)
【摘要】:Thispracticeisdesignedtosimulatethein-serviceoxidativeagingthatoccursinasphaltbindersduringpavementservice.Residuefromthisconditioningpracticemaybeusedtoestimatethephysicalorchemicalpropertiesofasphaltbindersafterseveralyearsofin-serviceaginginthefield.BindersconditionedusingthispracticearenormallyusedtodeterminespecificationpropertiesinaccordancewithSpecificationD6373orAASHTOM320.Forasphaltbindersofdifferentgradesorfromdifferentsources,thereisnouniquecorrelationbetweenthetimeandtemperatureinthisconditioningpracticeandin-servicepavementageandtemperature.Therefore,foragivensetofin-serviceclimaticconditions,itisnotpossibletoselectasinglePAVconditioningtime,temperatureandpressurethatwillpredictthepropertiesortherelativerankingsofthepropertiesofasphaltbindersafteraspecificsetofin-serviceexposureconditions.TherelativedegreeofhardeningofdifferentasphaltbindersvarieswithconditioningtemperaturesandpressuresinthePAV.Therefore,twoasphaltbindersmayageatasimilarrateatoneconditionoftemperatureandpressure,butagedifferentlyatanothercondition.Hence,therelativeratesofagingforasetofasphaltsatPAVconditionsmaydiffersignificantlyfromtheactualin-servicerelativeratesatlowerpavementtemperaturesandambientpressures.1.1Thispracticecoverstheacceleratedaging(oxidation)ofasphaltbindersbymeansofpressurizedairandelevatedtemperature.Thisisintendedtosimulatethechangesinrheologywhichoccurinasphaltbindersduringin-serviceoxidativeagingbutmaynotaccuratelysimulatetherelativeratesofaging.ItisnormallyintendedforusewithresiduefromTestMethodD2872(RTFOT),whichisdesignedtosimulateplantaging.Note18212;ModifiedasphaltbindersmayphaseseparateorformskinsduringovenconditioninginTestMethodD2872(RTFOT);theresultsfromsubsequenttestingofthisresiduemaynotberepresentativeofmodifiedasphaltsshort-termagedunderfieldconditions.Phaseseparation,orformationofskins,orbothcanalsooccurduringPAVconditioning.Therefore,thepracticemaynotbesuitableforsomemodifiedasphalts.Note28212;PAVconditioninghasnotbeenvalidatedformaterialscontainingparticulatematerials.1.2Theagingofasphaltbindersduringserviceisaffectedbyambienttemperatureandbymixture-associatedvariables,suchasthevolumetricproportionsofthemix,thepermeabilityofthemix,propertiesoftheaggregates,andpossiblyotherfactors.Thisconditioningprocessisintendedtoprovideanevaluationoftherelativeresistanceofdifferentasphaltbinderstooxidativeagingatselectedelevatedagingtemperaturesandpressures,butcannotaccountformixturevariablesorprovidetherelativeresistancetoagingatin-serviceconditions.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Valuesinparenthesesininch-poundunitsareprovidedforinformationalpurposesonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:E43
【国际标准分类号】:93_080_20
【页数】:6P.;A4
【正文语种】:英语