A Comparison between Ground Penetrating Radar (GPR) and Impact3000

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1、AComparisonbetweenGroundPenetratingRadar(GPR)andImpactEcho(IE)forDetectionofCommonConcreteBridgeDecksDefects1234SherifYehia,OsamaAbudayyeh,SalehNabulsi,IkhlasAbdelqaderAbstractTheconditionofthetransportationnetworkintheUnitedStatesisDeterioratingandwillrequireenormouseffortstosignificantlyimprov

2、eitsstate.Outofthe600thousandbridges,almost14%isstructurallyobsoleteandanother14%isfunctionallyobsolete.Concretebridgeconditionassessmentisachallengetobridgeinspectorsbecauseofthevarietyofproblemsthatmayexist.Therefore,theneedforinnovativeinspectionandmaintenanceprogramsisrisingandnewtechnologie

3、sarebeingappliedtofacilitatethedetectionofdifferentdefectsthataffectconcretebridges.Animportantcomponentoftheinspectionandrehabilitationofconcretebridgesistheabilitytoassesstheconditionofthebridge’sdeck.Theadventofnondestructiveevaluationtechniquesaidedthistask.Severalnondestructivetechniqueshav

4、ebeensuccessfullyutilizedtodetectcommondefectsinconcretebridgedecks.ThispaperwillstudyGroundPenetratingRadar(GPR)andImpactEcho(IE)abilitiesinthedetectionofthemostcommonconcretebridgedeckdefectsfacedbyinspectorsusingfabricatedbridgedeckswithsimulateddefects.Thesesimulateddeckswillbeusedtovalidate

5、andcomparetheabilitiesofbothmethodsindetectingthepresenceofcracks,delaminations,andvoids.BackgroundGroundPenetratingRadar(GPR)dependsontheuseofelectromagneticwavestopropagatedielectricmaterialsemployingtheuseofradar(RadioDetectionandRanging)andradiowavesemittedfromasourcetodetectanobjectanddeter

6、minethesize,direction,distanceandpropertiesoftheobjectafteritreflectssomeoftheenergythatfallsonit(Maser1996).Thematerialsdielectricconstantistheamountofelectrostaticenergystoredperunitvolumeforaunitpotentialgradient(Roddis1987).Itshowsthematerialabilitytobepolarizedandthereforeitsabilityofstorin

7、gachargewhenanelectricfieldisapplied(Loulizi2001).ThedielectriccontrastbetweentwomediumsplaysamajorpartintheabilityofGPRtodetecttheinterfacesordiscontinuities.1AssistantProfessor,CivilandConstructionEngineeringDepartment,Wes