ASTM_D_1734_-_93_2013.pdf

Designation:D173493(Reapproved 2013)Standard Practice forMaking Cementitious Panels for Testing Coatings1This standard is issued under the fixed designation D1734;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.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This practice covers procedures for molding and curingcementitious panels for use in exposure testing of coatingsdesigned for masonry or cementitious surfaces,although thesemay be suitable for other tests.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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.2.Referenced Documents2.1 ASTM Standards:2C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C150 Specification for Portland CementC230/C230M Specification for Flow Table for Use in Testsof Hydraulic CementC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC778 Specification for SandC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic CementsD4258 Practice for Surface Cleaning Concrete for CoatingD4259 Practice for Abrading ConcreteD4260 Practice for Liquid and Gelled Acid Etching ofConcrete3.Significance and Use3.1 Researchers in the field of coatings have recognized theneed for a standardized substrate for evaluating coatingsintended for use on cementitious surfaces.This practice de-scribes the preparation of such panels.4.Apparatus4.1 MoldsHigh density polyethylene molds to make thepanels as required.34.1.1 Outdoor Exposure Tests,for use on outdoor exposuretesting racks,the panels shall be 200 by 300 by 15 mm(8 by12 by916in.)in size.4.1.2 Machine Exposure Tests,for machine exposure tests,the typical panel is 75 by 150 by 15 mm(3 by 6 by916in.)insize.4.1.3 Other sizes to fit specific equipment may be used.4.2 Trowel,rectangular having a steel blade approximately100 to 150 mm(4 to 6 in.)in length,with straight edges,and75 to 125 mm(3 to 5 in.)in width is generally recommended.4.3 Weights and Weighing Devices,conforming to the re-quirements of Specification C1005.The weighing device shallbe evaluated for precision and bias at a total load of 2000 g.4.4 Mechanical MixerAn electrically driven mechanicalmixer of the type equipped with a paddle and mixing bowl,asspecified in Practice C305.4.5 Flow Table,as described in Specification C230/C230M.5.Materials5.1 White Portland Cement,conforming to the requirementsof Type I of Specification C150.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.47 on Concrete,Stone and Masonry Treatments.Current edition approved June 1,2013.Published June 2013.Originallyapproved in 1960.Last previous edition approved in 2007 as D1734 93(2007).DOI:10.1520/D1734-93R13.2For 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.3The sole source of supply of molds known to the committee at this time is theAmerican Cube Mold,Macedonia,OH 44056.If you are aware of alternativesuppliers,please provide this information to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 Graded Standard Sand,conforming to the requirementsof Specification C778.6.Procedure6.1 Preparation of MaterialMix the cement:sand:water ina ratio of 1:2:0.43 to obtain a flow of 110 6 5%,whendetermined as specified in Determination of Flow in theProcedure Section of Test Method C109/C109M.Typically,forthree large test panels,weigh out 1800 g of portland cement,3600 g of graded sand and 770 g of water.For three small testpanels,use 350 g of portland cement,700 g of sand and 150 gof water.NOTE1Minor adjustments to the flow may be made by the additionor subtraction of small amounts of sand.6.2 Forming Panels:6.2.1 Place the mixture in the mold and spread thoroughlywithin 5 mi