Designation:C780−18aStandardTestMethodforPreconstructionandConstructionEvaluationofMortarsforPlainandReinforcedUnitMasonry1ThisstandardisissuedunderthefixeddesignationC780;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.INTRODUCTIONThistestmethodprovidesastandardprocedureforsamplingandtestingmortarsforcompositionandplasticandhardenedproperties,eitherbeforeorduringactualconstruction.TheproceduresoutlinedintheAnnexesareconsideredapplicableforevaluatingvariouscombinationsofportlandcement,lime,andmasonrycementformortarscommontoplainandreinforcedunitmasonryconstruction.Thetestproceduresdescribemethodsforthemeasurementofmortarcompositionandmortarproperties.Noattemptismadetoclaimorsubstantiatespecificcorrelationsbetweenthemeasuredpropertiesandmortarperformanceinthemasonry.However,datafromthesetestmethodscanbecombinedwithotherinformationtoformulatejudgmentsaboutthequalityofthemasonry.Testingusingtheseproceduresislimitedtothepreconstructionevaluationofmasonrymortarswithinthelaboratory,totheevaluationofmasonrymortarsattheconstructionsite,andinestablishingthedegreeofqualitycontrolexercisedduringmortarproductionattheconstructionsite.1.Scope*1.1Thistestmethodcoversproceduresforthesamplingandtestingofmortarsforcompositionandfortheirplasticandhardenedproperties,eitherbeforeorduringtheiractualuseinconstruction.NOTE1—GuideC1586providesguidanceonevaluatingmortarandclarifiesthepurposeofboththistestmethodandSpecificationC270.NOTE2—ThetestingagencyperformingthistestmethodshouldbeevaluatedinaccordancewithPracticeC1093.1.2PreconstructionEvaluation—Thistestmethodpermitscomparisonsofmortarsmadefromdifferentmaterialsundersimulatedfieldconditions.Itisalsousedtoestablishbaselinevaluesforcomparativeevaluationoff...
