【英文标准名称】:StandardTestMethodforDeterminingtheThicknessofBoundPavementLayersUsingShort-PulseRadar
【原文标准名称】:使用短脉冲雷达测定粘合路面层厚度的标准试验方法
【标准号】:ASTMD4748-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:E17.41
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:建筑;施工材料;精整;材料;路面;路面(道路);额定值;道路建筑;公路建设;道路;承重面的表面修饰;表面;试验;厚度
【英文主题词】:layerthickness;pavementthickness;radar;short-pulseradar
【摘要】:Thistestmethodpermitsaccurateandnondestructivethicknessdeterminationofboundpavementlayers.Assuch,thistestmethodiswidelyapplicableasapavementsystem-assessmenttechnique.Althoughthistestmethod,undertherightconditions,canbehighlyaccurateasalayer-thicknessindicator,consistentlyreliableinterpretationofthereceivedradarsignaltodeterminelayerthicknessescanbeperformedonlybyanexperienceddataanalyst.Suchexperiencecanbegainedthroughuseofthesystemandthroughtrainingcoursessuppliedbyvariousequipmentmanufacturersorconsultingcompanies.Alternatively,theoperatormaywishtousecomputersoftwaretoautomaticallytrackthelayerboundariesandlayerthickness,whereapplicable..1.1Thistestmethodcoversthenondestructivedeterminationofthicknessofboundpavementlayersusingshort-pulseradar.Boundpavementlayersaredefinedastheupperlayersofapavement,consistingofmaterialssuchasbituminous,concrete,portland-cementconcrete,roller-compactedconcrete,andstabilizedbases.Boundpavementlayersdoesnotincludegranularbaseandsubbasematerials.1.1.1Astheelectromagneticwavegeneratedbyradarpropagatesthroughtheboundpavementlayers,thewaveisattenuated,dispersedandreflectedatlayerinterfaces.Atsomedepth,duetothewaveattenuationanddispersion,thereflectionsatthelayerinterfacescannotbedetectedbytheradar.Thismaximumpenetrationdepthisacomplexfunctionofradarsystemparameterssuchastransmittedpower,receiversensitivity,centerfrequencyandbandwidthoftheradarsystemandsignalprocessing,aswellastheelectromagneticpropertiesofthepavementmaterialsandenvironmentalfactorssuchasmoisturecontent.1.1.2Radarsystemresolutionisdeterminedmainlybythetransmittedpulselengthandbandwidthoftheradar.Atypicalsystemforthisapplicationusuallyhasaresolutionsufficienttodetermineaminimumlayerthicknessof40mm(1.5in.)toanaccuracyof5mm(0.2in.).Improvementsinsystemresolutionmaybepossiblewithadditionalsignalprocessing.1.2Thistestmethodmaynotbesuitableforapplicationtopavementswhichexhibitincreasedconductivityduetotheincreasedattenuationoftheelectromagneticsignal.Examplesofscenarioswhichmaycausethisare:extremelymoistorwet(saturated)pavementsiffreeelectrolytesarepresentandslagaggregatewithhighironcontent.1.3Thevaluesstatedinmm-kilogramunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardstatementsaregiveninSection.Note1Boundpavementlayersaredefinedastheupperlayersofapavement,consistingofmaterialssuchasbituminous,concrete,portland-cementconcrete,roller-compactedconcrete,andstabilizedbases.Boundpavementlayersdonotincludegranularbaseandsubbasematerials.
【中国标准分类号】:P66;Q20
【国际标准分类号】:93_080_20
【页数】:5P.;A4
【正文语种】: