Designation:D4957−18StandardTestMethodforApparentViscosityofAsphaltEmulsionResiduesandNon-NewtonianAsphaltsbyVacuumCapillaryViscometer1ThisstandardisissuedunderthefixeddesignationD4957;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesproceduresprimarilyde-signedtodeterminetheapparentviscositiesofresiduesob-tainedbydistillingasphaltemulsionsaccordingtoTestMethodD6997.Itisalsorecommendedforuseonnon-Newtonianasphaltsatanytemperaturewithinthecapabilityoftheapparatus.Thistestmethodisusefulincharacterizingrheo-logicalpropertiesofnon-Newtonianasphaltsasafunctionofshearrateundertheconditionsofthetestmethod.Thistestisruninstraightopen-endtubeviscometers,normallyat60°C,butissuitableforuseatothertemperatures.Itisapplicableovertherangefrom5to50000Pa·s.NOTE1—Theprecisionforthistestmethodisbasedondeterminationsmadeat60°C.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard,exceptinreferencetoviscometerconstantorcalibra-tionfactor(K).1.3Warning—MercuryhasbeendesignatedbytheUnitedStatesEnvironmentalProtectionAgency(EPA)andmanystateagenciesasahazardousmaterialthatcancausecentralnervoussystem,kidney,andliverdamage.Mercuryoritsvapormaybehazardoustohealthandcorrosivetomaterials.Cautionshouldbetakenwhenhandlingmercuryandmercury-containingproducts.SeetheapplicableproductMaterialSafetyDataSheets(MSDS)fordetailsandtheEPA’swebsite(www.epa.gov/mercury/faq.htm)foradditionalinformation.Usersshouldbeawarethatsellingmercury,mercury-containingproducts,orboth,inyourstatemaybeprohibitedbystatelaw.1.4Thetextofthisstandardreferencesnotesandfootnoteswhichprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,ass...
