ASTM_D_4260_-_05_2012.pdf

Designation:D426005(Reapproved 2012)Standard Practice forLiquid and Gelled Acid Etching of Concrete1This standard is issued under the fixed designation D4260;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 preparation of concrete toprepare the surface prior to the application of coatings.1.2 This practice is intended to alter the surface profile ofthe concrete and to remove foreign materials and weak surfacelaitance.1.3This 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 6.2.Referenced Documents2.1 ASTM Standards:2D4258 Practice for Surface Cleaning Concrete for CoatingD4259 Practice for Abrading ConcreteD4262 Test Method for pH of Chemically Cleaned or EtchedConcrete SurfacesD4263 Test Method for Indicating Moisture in Concrete bythe Plastic Sheet MethodD4541 Test Method for Pull-Off Strength of Coatings UsingPortable Adhesion Testers2.2 Other Standard:ACI-308 Guide to Curing Concrete33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 gelled acid,nacid solution primarily intended foruse on horizontal,vertical,and overhead surfaces.3.1.2 liquid acid,nacid solution primarily intended foruse on horizontal surfaces.4.Summary of Practice4.1 Thispracticeisintendedtoprovideaclean,contamination-free,and roughened surface.4.2 Acceptable surfaces shall be free of laitance,formrelease agents,curing agents,oil,grease,and other penetratingcontaminants.The surface shall be free of fins,projections,andloosely adhering concrete,dirt,and dust particles.4.3 For some applications,a minimum concrete surfacestrength may be required for proper coating performance.5.Significance and Use5.1 This practice is used to prepare concrete for coatingswhere optimum bond is desired for service conditions such ascontinuous or intermittent immersion,temperature cycling,ormechanical loading.6.Hazards6.1 New concrete shall be cured in accordance with ACI-308.6.2 Concrete cure compounds,form release materials,orconcrete hardeners may require abrading,in accordance withPractice D4259,as acid etching may not be effective.6.3 All oil and grease shall be removed in accordance withPractice D4258 prior to mechanical abrading,abrasive blastcleaning,water blasting,or acid etching.6.4 Use and disposal of materials should conform to estab-lished federal,state,local,and project requirements.METHOD A7.Liquid Acid Etching Procedure7.1 Pre-Surface Preparation:7.1.1 Remove grease,oil,and other penetrating contami-nants(see Practice D4258).7.1.2 Remove fins and protruding surface irregularities bymechanical means.7.1.3 Surfaces shall be free of standing water.7.1.4 Some curing compounds may not be removed byliquid acid etching and will require preparation by mechanicalabrading,abrasive blasting,or water blasting in accordancewith Practice D4259.1This 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 D4260 05.DOI:10.1520/D4260-05R12.2For 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 7.1.5 When using liquid acid,proper cross ventilation andchemical respirators shall be provided.7.2 Suitable Surfaces:7.2.1 This method is primarily suited for use on horizontalsurfaces.7.2.2 Other methods of preparation may be more suitablefor rough concrete surfaces and walls or overhead surfaces.7.3 Liquid Acid Etching Solutions:7.3.1 Typical solutions covered by this method are muriatic(hydrochloric),sulfamic,phosphoric and citric acids.Hydro-chloric acid shall not be used where chlorides are prohibited.7.3.2 The liquid acid concentrations of etching solutionsmay vary,depending on the concrete texture and degree ofetching required.7.3.3 The concrete surface shall be pre-wetted with waterprior to applying etching solutions.Free-standing water shallbe removed.Uniformly apply the etching solution to the wetsurface.Polyethylene sprin