Designation:D4262−05(Reapproved2012)StandardTestMethodforpHofChemicallyCleanedorEtchedConcreteSurfaces1ThisstandardisissuedunderthefixeddesignationD4262;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversproceduresfordeterminingtheacidityoralkalinityofconcretesurfacespreparedbychemicalcleaningoretchingpriortocoating.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1Definitions:2.1.1pH,n—ameasureofacidityoralkalinityofasolutionorsurface,withneutralityrepresentedbyavalueof7,withincreasingacidityrepresentedbysmallervalues,andwithincreasingalkalinityrepresentedbyincreasingvalues.3.SignificanceandUse3.1Chemicalcleaningandetchingisusedtoprepareconcreteforcoating.3.2Residualchemicalsnotremovedbywaterrinsingmayadverselyaffecttheperformanceandadhesionofcoatingsappliedoverpreparedconcretesurfaces.Itistheintentofthistestmethodtodeterminethatresidualchemicalshavebeenremovedbymeasuringtheacidityoralkalinityofthefinalrinsedsurface.4.Apparatus4.1ThespecificapparatusforeachtestisdescribedinAnnexA1-AnnexA3.5.Materials5.1PotableWater,forrinsingchemicallycleanedoretchedconcretesurfaces.5.2WetConcreteSurface,followingthefinalwaterrinseandbeforetherinsewaterhascompletelydrainedoffthesurface.6.Procedure6.1Thepreparatoryactionsforeachalternativearede-scribedinAnnexA1-AnnexA3.6.2AtleasttwosurfacepHreadingsshallbetakenforeach500squarefeetorportionthereof.Readingsshallbetakenatrandomlyselectedlocationsimmediatelyfollowingthefinalrinseandbeforealltherinsewaterhasdrainedoffthesurface.6.3ThepHofthewaterusedforrinsingshallbedeterminedtoestablishacceptance...
