Designation:D4602−93(Reapproved2020)StandardGuideforNondestructiveTestingofPavementsUsingCyclic-LoadingDynamicDeflectionEquipment1ThisstandardisissuedunderthefixeddesignationD4602;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversthepreparation,equipment,calibra-tionofequipment,locationoftestpoints,magnitudesandconfigurationsofappliedloads,cyclicfrequencies,andpresen-tationofdatafornondestructivetestingofpavementsusingcyclic-loadingdynamicdeflectionequipment.1.2Cyclic-loadingdynamicdeflectionequipmentincludesagroupofdevicesthatinduceasteady-statesinusoidalvibrationinthepavementthroughcyclicgenerationofadynamicload.Allsuchdevicesapplyastaticloadonthepavementsurface,resultinginastaticdeflection,andtheninducesomesinusoidalloadandconsequentdeflectionaroundthestaticloadanddeflectionthroughanappliedsteady-statedynamicload.1.3Astherearegreatdifferencesbetweenvariouscyclic-loadingdynamicdeflectiondevices,thisguideisintendedtogiveuniformlyapplicableguidance,ratherthanspecificinstructions,fortheiruse.Forinstance,itwillspecifythatcalibrationofthedevicesandtheirinstrumentationbecarriedoutatthefrequenciesandinaccordancewithproceduresrecommendedbytheirmanufacturers,ratherthanprovidingspecificinstructions.Also,dataisspecifiedforcollectionthatshouldproveadequateforusualapplicationsofsuchdeflectiondata,butnoproceduresareincludedfor“back-calculating”elasticmoduliofpavementlayersorothersuchapplications.1.4Thisguidedoesnotapplytostaticdeflectionequipmentsuchasthe“BenkelmanBeam,”automatedbeamdeflectionequipmentsuchasthe“CaliforniaTravelingDeflectometer,”orimpulsedeflectionequipmentsuchasthe“FallingWeightDeflectometer.”1.5Itiscommonpracticeintheengineeringprofessiontoconcurrentlyusepoundstorepresentbothaunitofmass(lbm)andofforce(lbf).Thisimplicitly...
