ASTM_D_4261_-_05_2012.pdf

Designation:D426105(Reapproved 2012)Standard Practice forSurface Cleaning Concrete Masonry Units for Coating1This standard is issued under the fixed designation D4261;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers surface cleaning of concrete ma-sonry units to remove dust,dirt,mortar spatter,oil,and greaseprior to the application of coatings.Procedures include vacuumcleaning,air-blast cleaning,water cleaning,detergent waterwash,steam cleaning,and mechanical cleaning.1.2 This practice may alter the surface profile of theconcrete but is primarily intended to clean the surface.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see Section 5.2.Referenced Documents2.1 ASTM Standards:2D4258 Practice for Surface Cleaning Concrete for CoatingD4262 Test Method for pH of Chemically Cleaned or EtchedConcrete SurfacesD4263 Test Method for Indicating Moisture in Concrete bythe Plastic Sheet Method2.2 Other Standard:ACI 531.1-76 Specification for Concrete Masonry Construc-tion33.Summary of Practice3.1 Surface cleaning is intended to provide a clean,contamination-free surface suitable for the application ofcoatings.3.2 Acceptable surfaces shall be free of dust,dirt,mortarspatter,oil,grease,and other contaminants.Mortar joints shallbe struck flush or tooled with a round jointer and shall be freeof rough edges and nibs(see ACI 531.1-76).3.3 Vacuum cleaning,air blast cleaning,water cleaning,detergent water wash,steam cleaning,hand tool,and mechani-cal cleaning are acceptable cleaning methods.3.4 Any one or a combination of listed cleaning proceduresmay be used to achieve acceptably cleaned surfaces.4.Significance and Use4.1 Surface cleaning is to be used to prepare concrete unitmasonry surfaces for applying coatings intended for light dutyservice,splash and spillage of water and chemical solutions,radiation exposure,decontamination,and repeated washdownswith alkaline cleaners.5.Cautions5.1 Moisture in concrete unit masonry may be detrimentalto coating adhesion.Moisture content shall be in compliancewith the coating manufacturers recommendations(see TestMethod D4263 for moisture test method).6.Procedures6.1 Steam CleaningThis procedure is intended to removeheavy deposits of grease and oil,as well as other water solublesurface contaminants and emulsifiable materials,with a jet ofhigh pressure steam,in accordance with Practice D4258.6.2 Detergent Water WashThis procedure is intended toremove water soluble surface contaminants,oils,grease,andother emulsifiable materials with an aqueous solution ofdetergent or nonsolvent emulsifier in accordance with PracticeD4258.6.3 Water CleaningThis procedure is intended to removedust,dirt,and water soluble contaminants with a stream ofwater under pressure,in accordance with Practice D4258.6.4 Mechanical Tool Cleaning:6.4.1 The intent of this procedure is to remove mortarspatter,efflorescence,and similar dry,firmly adhering foreignmaterial prior to performing either cleaning operation.6.4.2 This procedure shall consist of scraping,abrading,brushing,or stoning to dislodge mortar and similar materialsfrom the surface.1This practice is under the jurisdiction of ASTM Committee D33 on ProtectiveCoating and Lining Work for Power Generation Facilities and is the directresponsibility of Subcommittee D33.05 on Application and Surface Preparation.Current edition approved May 1,2012.Published May 2012.Originallyapproved in 1983.Last previous edition approved in 2005 as D4261 05.DOI:10.1520/D4261-05R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Concrete Institute(ACI),P.O.Box 9094,FarmingtonHills,MI 48333-9094,http:/www.concrete.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.4.3 Clean in accordance with Practice D4258 to removedust and loose particles.6.5 Vacuum CleaningThis procedure is intended to re-move surface dust and other debris by vacuum cleaning inaccordance with Practice D4258.6.6 Air Blast CleaningThis procedure is intended toremove debris,dust,dirt,and loosely adhering material by airblast cleaning in accordance with Practice D4258.7.Inspection7.1 Visually examine prepared surface for the presence ofdebris,dust,dirt,oil,grease,loose particles,mortar spatter,andother contaminants.7.2