Designation:D168–94(Reapproved2000)AmericanAssociationStateHighwayTransportationStandardAASHTONo.61StandardTestMethodforCokeResidueofCreosote1ThisstandardisissuedunderthefixeddesignationD168;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthecokeresidue(fixedcarbon)ofcreosote,coaltar,andcreosote-coaltarsolutions.Ascoaltarsvaryintheircokeresiduevalues,themethodisthereforenotaquantitativeindexofthepercentageofcoaltarincreosote-coaltarsolutions.However,byspeci-fyingmaximumamountsofcokeresidueasdoneinAWPAStandardsP2andP12,themethoddoesservetolimittheamountofcoaltarinsuchsolutions;andbyspecifyingaminimumasinStandardP12itensuresthepresenceofsomecoaltar.FormerlythetestwasalsousedasacheckonthecleanlinessofAWPAP1creosote(absenceofcoaltar).1.1.1TestMethodsD38coversthesamplingofwoodpreservativespriortotesting.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.SeeSection6forspecificprecautionarystatements.2.ReferencedDocuments2.1ASTMStandards:D38TestMethodsforSamplingWoodPreservativesPriortoTesting2D246TestMethodforDistillationofCreosoteandCreosote-CoalTarSolutions22.2AWPAStandards:P2Creosote–CoalTarSolution3P12Creosote–CoalTarSolutionforTreatingofMarine(CoastalWaters),Piles,andTimbers33.SummaryofTestMethod3.1Aftersubjectingthecreosote-coaltarsolution(oil)undertesttothedistillationmethod(StandardA1,Section2),theweighedresidueat355°Cinthedistillationflaskisthoroughlymixedandaone-gramsampletransferredtoaspecialplatinumcruciblewithventedcover.Thecrucibleisthenplacedinafurnacemaintainedat950620°Cforexactly7min.Afinalweighinggivestheamo...
