Designation:C1794−15StandardTestMethodsforDeterminationoftheWaterAbsorptionCoefficientbyPartialImmersion1ThisstandardisissuedunderthefixeddesignationC1794;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddefinesaproceduretodeterminethewaterabsorptioncoefficientofamaterialbypartialsubmer-sion.Thescopeistoevaluatetherateofabsorptionofwaterduetocapillaryforcesforbuildingmaterialsincontactwithnormalordrivingrainabovegrade.Theprocedureistypicallysuitablemainlyformasonrymaterial,plaster,oracoatingincombinationwithasubstrate;butitcanalsobeusedforinsulationmaterials.Thistestmethodisdesignedtobeusedonlyonhomogeneousmaterialsanddoesnotapplytomaterialsthatarecompositesornon-homogeneous(forexample,FacedRigidClosed-cellInsulation).Itisnotwithinthescopeofthisstandardtodetermineliquiduptakephenomenainbelow-gradeapplications.Thewaterabsorptioncoefficientismainlyusedasaninputdatumfornumericalsimulationofthecombinedheatandmoisturetransportinbuildingenvelopesfordesignandforensicinvestigationpurposes.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.However,derivedresultscanbeconvertedfromonesystemtotheotherusingappropriateconversionfactors(seeTable1).1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C168TerminologyRelatingtoThermalInsulation2.2OtherStandards:3ISO9346Hygrothermalperformanceofbuildingsandbuild-ingma...
