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1、ARTICLEINPRESSNDT&EInternational39(2006)585–593www.elsevier.com/locate/ndteintMicrowaveNDTofcement-basedmaterialsusingfar-fieldreflectioncoefficientsK.Arunachalam,V.R.Melapudi,L.Udpa,S.S.UdpaDepartmentofElectricalandComputerEngineering,MichiganStateUniversity,EastLansing,MI,USARece
2、ived28October2005;receivedinrevisedform7March2006;accepted8March2006Availableonline12May2006AbstractPeriodicassessmentofageingcivilstructuresisimportantforstructuralintegrityandpublicsafety.Numerousdestructiveandnon-destructivetechniquesemployingdifferentenergysourceshavebeenprop
3、osedforstructuralhealthmonitoring.Amongstthenon-destructiveevaluationtechniquesproposedformonitoringmaterialstrengthandcontentsofconcretestructures,techniquesemployingmicrowavesofferdistinctadvantagesinthattheyarenon-radioactiveandprovidegoodpenetration,excellentcontrastbetweenst
4、eelreinforcementbarandconcrete,andinsensitivitytoambienttemperature.Inthispaper,thefeasibilityofafar-fieldmicrowaveNDEtechniqueforconcreteimagingisinvestigatedvianumericalsimulationsandexperimentsoncementbasedsamplesusingfar-fieldmicrowavereflectioncoefficients.r2006ElsevierLtd.Allri
5、ghtsreserved.Keywords:Farfield;MicrowaveNDE;Reflectioncoefficient;Concrete;Mortar1.IntroductionobtainedusingradarandultrasonicNDTonconcretetestspecimenshavealsobeenreported[15].ComparedtootherCorrosionofsteelreinforcementinconcreteisacomplexpenetratingenergysources,microwaveprovesto
6、beelectrochemicalprocessinfluencedbycementtype,mixturepromising,largelyduetothefactthatmicrowavescanproportions,curingconditions,ageandenvironmentalpenetratedeepinsidetheconcrete,scatterlittlecomparedconditions[1].Onceinservice,reinforcementbarsintoacousticwaves,offerexcellentcont
7、rastbetweenconcreteconcretestructurearepronetocorrosionandrequireandsteelreinforcementbar,offergoodresolution,arenotperiodicassessmenttopreventstructuralfailure.Besideshazardous,lowincostascomparedtoradioactivestructuralhealthmonitoring,maintenanceoperationsoftenmethods,andinsens
8、itivetoenvironmentalconditionsrequirenon
