Designation:C215−14StandardTestMethodforFundamentalTransverse,Longitudinal,andTorsionalResonantFrequenciesofConcreteSpecimens1ThisstandardisissuedunderthefixeddesignationC215;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversmeasurementofthefundamen-taltransverse,longitudinal,andtorsionalresonantfrequenciesofconcreteprismsandcylindersforthepurposeofcalculatingdynamicYoung’smodulusofelasticity,thedynamicmodulusofrigidity(sometimesdesignatedas“themodulusofelasticityinshear”),anddynamicPoisson’sratio.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C31/C31MPracticeforMakingandCuringConcreteTestSpecimensintheFieldC42/C42MTestMethodforObtainingandTestingDrilledCoresandSawedBeamsofConcreteC125TerminologyRelatingtoConcreteandConcreteAg-gregatesC192/C192MPracticeforMakingandCuringConcreteTestSpecimensintheLaboratoryC469/C469MTestMethodforStaticModulusofElasticityandPoisson’sRatioofConcreteinCompressionC670PracticeforPreparingPrecisionandBiasStatementsforTestMethodsforConstructionMaterialsE1316TerminologyforNondestructiveExaminations3.Terminology3.1Definitions—RefertoTerminologyC125andthesectionrelatedtoultrasonicexaminationinTerminologyE1316fordefinitionsoftermsusedinthistestmethod.4.SummaryofTestMethod4.1Thefundamentalresonantfrequenciesaredeterminedusingoneoftwoalternativeprocedures:(1)theforcedreso-nancemethodor(2)theimpactreso...
