Designation:D4694−09(Reapproved2020)StandardTestMethodforDeflectionswithaFalling-Weight-TypeImpulseLoadDevice1ThisstandardisissuedunderthefixeddesignationD4694;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofdeflectionsofpavedandunpavedsurfaceswithafalling-weight-typeimpulseloaddevice.Thesedevicesarecommonlyreferredtoasfalling-weightdeflectometersorFWDs.1.2Thistestmethoddescribesthemeasurementofverticaldeflectionresponseofthesurfacetoanimpulseloadappliedtothepavementsurface.Verticaldeflectionsaremeasuredontheloadaxisandatpointsspacedradiallyoutwardfromtheloadaxis.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.AspecifichazardstatementisgiveninSection6.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4695GuideforGeneralPavementDeflectionMeasure-ments2.2StrategicHighwayResearchProgram:LongTermPavementPerformanceProgramManualforFallingWeightDeflectometerMeasurements,Version4.1,December20063.SummaryofTestMethod3.1Thistestmethodisatypeofplate-bearingtest.Theloadisaforcepulsegeneratedbyaweightdroppedonabuffersystemandistransmittedthroughaplaterestingonthepavementsurface.Thetestapparatusmaybemountedinavehicleoronasuitabletrailertowedbyavehicle.3.2Thevehicleisbroughttoastopwiththeloadingpl...
