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1、ApplicationofResultsofNondestructiveTestingMethodsintheInvestigationofMicrostructureofRefractoryConcretes12AnjaM.TerzićandLjubicaM.PavlovićAbstract:Theaimofthisinvestigationistoestablishthecorrelationbetweenconcreteporosity,compressivemechanicalstrength
2、,andmicrostructureusingtheresultsofnondestructivetestingmethods,i.e.,ultrasonicpulsevelocityUPVandimageanalysis.Researchersandengineersusuallyuseresultsofstandardlaboratoryproceduresinordertoobtainmechanicalpropertiesofamaterial.Thatprocessislongandit
3、requireslargenumberofsamples,i.e.,alotoftimeandlotofmaterial.ImageProPlusIPPandUPVaremethodswhichcanprovideequallyaccurateresults.Thesemethodsaremuchmoresimple,rapid,andcheaper.Nondestructivetestmethodswereappliedonthecorundumandbauxitebasedrefractory
4、concretes.Investigatedconcretesarevaryinginchemicalandmineralogicalcomposition.Mechanicalcompressivestrengthofconcretesamplesafterthermaltreatmentatvarioustemperatures110,800,1,000,1,300,and1,500°Cwasinvestigatedusingstandardlaboratoryprocedureandafte
5、rwardwithUPVtechnique.Lossofstrengthanddegradationoccurswhenrefractoryconcretesampleissubjectedtoincreasedtemperatureandcompressiveload;therefore,measurementofmechani-calpropertiescanindicateandmonitorthechangesinthemicrostructure.Levelofsurfacedeterior
6、ationafterthermaltreatmentwasdeterminedusingopticalmicroscopeandIPP.Nondestructiveultrasonicmeasurementwasalsousedasameansofmonitoringofincreasingporosityinrefractoryspecimens.UPVtechniqueandimageanalysisarereliablenondestructivemethodsforcharacterizati
7、onofmicrostructuraldefectsandcanbeusefulwhentypeofrefractoryconcreteistobechosenforanapplication.DOI:10.1061/ASCEMT.1943-5533.0000083CEDatabasesubjectheadings:Concrete;Nondestructivetests;Porosity;Imagingtechniques;Mechanicalproperties;Microstructures
8、.Authorkeywords:Refractoryconcrete;Nondestructivetestingmethods;Apparentporosity;Imageanalysis;Mechanicalproperties.Introductionbigger,andcrackswithinstructureoccurBazantandKaplan1996.ItresultsinlossofstrengthanddegradationBaz
