Designation:D5312/D5312M−21StandardTestMethodforEvaluationofDurabilityofRockforErosionControlUnderFreezingandThawingConditions1ThisstandardisissuedunderthefixeddesignationD5312/D5312M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoverstheproceduresforevaluatingthedurabilityofrockforerosioncontrolbyevaluatingtheperformanceofslabsofrockwhenexposedtofreezingandthawingconditions.Thisweatheringtestexposestherocktofreezingandthawingcyclessimilartonaturalweathercondi-tions.Therockslabs,preparedinaccordancewithproceduresinPracticeD5121,areintendedtoberepresentativeoferosioncontrolrockanditsweaknesses.Thetestisappropriateforbreakwaterstone,armorstone,riprap,andgabionsizedrockmaterials.1.2Thelimitationsofthetestaretwofold.1.2.1First,thesizeofthecutrockslabspecimensmayeliminatesomeoftheinternaldefectspresentintherockstructure.Thetestspecimensmaynotberepresentativeofthequalityofthelargerrocksamplesusedinconstruction.Carefulexaminationoftherocksourceandpropersamplingareessentialinminimizingthislimitation.1.2.2Second,thetestrequirestherockslabstobeexposedtoupto55freezing-thawingcycles.Thetestistimeintensiveandtheentireprocedureincludingsamplepreparation,testing,andanalysismayrequireinexcessoftwomonthsifautomatedfreezing-thawingequipmentisavailableandinexcessof5monthsifthemanualmethodisused.Thislimitationmakesthistestmostusefulasaninitialsourceapprovaltypetestandmaylimititspracticalusefulnessasamorefrequentqualitycontroltestduringconstruction.1.3Theuseofreclaimedconcreteandothersuchmaterialsisbeyondthescopeofthistestmethod.1.4Units—ThevaluesstatedineitherSIunitsorinch-poundunits[presentedinbrackets]aretoberegardedsepa-ratelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedinde-pendentlyoftheother.Co...
