Designation:D8262−22StandardTestMethodforDeterminingthepHofGranularMaterialforUseinEmbankments,Subgrades,andRetainingWallBackfil1ThisstandardisissuedunderthefixeddesignationD8262;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodusesapHmetertomeasurethepHofas-receivedgranularmaterialthatrepresentswhatwillbeusedinthefieldforembankments,subgrades,andretainingwallbackfillapplications.Theprincipaluseofthetestmethodistosupplementsoilresistivitymeasurementstoidentifyconditionsunderwhichthecorrosionofmetalembeddedingranularmaterial,orincontactwiththegranularmaterialmaybesharplyaccentuated.1.2ThepHofgranularmaterialisoftenspecifiedbyagenciestomeetcriteriathatarenecessarytopreventorreducecorrosionofmetalobjectsembeddedinthegranularmaterialusedinembankments,subgrade,andretainingwallbackfill.1.3ThetypesofgranularmaterialthatcanbetestedforpHusingthisstandardarenaturalormanufacturedcoarsesand,naturalorcrushedstone,naturalorcrushedgravel,air-cooledblastfurnaceslag,andaggregates:lightweight,heavyweight,ornormalweight.AccordingtoAASHTOM145,thesegranularmaterialsgenerallyfallintoAASHTOclassificationgroupsA-1,A-2-4,A-2-5,orA-3.Theidealmaterialisawell-graded,freedrainingmaterialthathaslessthan10-15%passingthe75µm(No.200)sieve.1.4Thistestisbasedonthevolumetricmethodbecausetheunitweightofthefillmaterialwillvarydependingonsourceandprojectspecifications.1.5Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Exceptthesievedesignations,theyareidentifiedusingthe“alternative”systeminaccordancewithSpecificationE11,suchas3in.andNo.200,insteadofthe“standard”of75mmand75µm,respectively.Nootherunitsofmeasurementareincludedinthisstandard.ReportingoftestresultsinunitsotherthanSIshallnotberegardedasnonconformancewiththisstandard.1.6Allobservedandcalculatedvalu...
