Designation:D4380−12StandardTestMethodforDensityofBentoniticSlurries1ThisstandardisissuedunderthefixeddesignationD4380;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthedensityofslurriesusedinslurryconstructiontechniques,suchasthoseusedforbarrierstocontrolthehorizontalmovementofliquids.ThistestmethodismodifiedfromAPIRecommendedPrac-tice13B.1.2Units—ThevaluesstatedinSIunitsaretoberegardedasstandard,unlessotherunitsarealsospecified,suchasdensityinlbm/ft3orlbm/gal.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D653TerminologyRelatingtoSoil,Rock,andContainedFluidsD3740PracticeforMinimumRequirementsforAgenciesEngagedinTestingand/orInspectionofSoilandRockasUsedinEngineeringDesignandConstruction2.2AmericanPetroleumInstitute(API)Standard:APIRP13BRecommendedPracticeStandardProcedureforTestingDrillingFluids(Section1)33.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsrelatingtothistestmethod,refertoTerminologyD653.4.SummaryofTestMethod4.1Themudbalanceistheinstrumentgenerallyusedforthistestmethod.Theweightofafixedvolumeoftheslurryismeasuredbymovingaridercounterweightalongagraduatedscale.Thedensityoftheslurryisthenreaddirectlyoffthegraduatedscaleaftertheinstrumentisbalanced.5.SignificanceandUse5.1Thistestmethodisusedtodeterminethedensityofbentoniticslurriesinthelaboratoryandfield.Forfreshlymixedslurry,thistestmethodmaybeusedasanindicatorofmixproportions.Forin-trenchslurry,acertainvaluemaybespecifiedformaintainingtrenchstability.NOTE1—Th...
