Designation:D4261−05(Reapproved2012)StandardPracticeforSurfaceCleaningConcreteMasonryUnitsforCoating1ThisstandardisissuedunderthefixeddesignationD4261;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverssurfacecleaningofconcretema-sonryunitstoremovedust,dirt,mortarspatter,oil,andgreasepriortotheapplicationofcoatings.Proceduresincludevacuumcleaning,air-blastcleaning,watercleaning,detergentwaterwash,steamcleaning,andmechanicalcleaning.1.2Thispracticemayalterthesurfaceprofileoftheconcretebutisprimarilyintendedtocleanthesurface.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection5.2.ReferencedDocuments2.1ASTMStandards:2D4258PracticeforSurfaceCleaningConcreteforCoatingD4262TestMethodforpHofChemicallyCleanedorEtchedConcreteSurfacesD4263TestMethodforIndicatingMoistureinConcretebythePlasticSheetMethod2.2OtherStandard:ACI531.1-76SpecificationforConcreteMasonryConstruc-tion33.SummaryofPractice3.1Surfacecleaningisintendedtoprovideaclean,contamination-freesurfacesuitablefortheapplicationofcoatings.3.2Acceptablesurfacesshallbefreeofdust,dirt,mortarspatter,oil,grease,andothercontaminants.Mortarjointsshallbestruckflushortooledwitharoundjointerandshallbefreeofroughedgesandnibs(seeACI531.1-76).3.3Vacuumcleaning,airblastcleaning,watercleaning,detergentwaterwash,steamcleaning,handtool,andmechani-calcleaningareacceptablecleaningmethods.3.4Anyoneoracombinationoflistedcleaningproceduresmaybeusedtoachieveacceptablycleanedsurfaces.4.SignificanceandUse4.1Surfacecleaningistobeusedtoprepareconcreteunitmasonrysurfacesforapplyingcoatingsi...
