1、Designation: D 1734 93 (Reapproved 2007)Standard Practice forMaking Cementitious Panels for Testing Coatings1This standard is issued under the fixed designation D 1734; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 mo
3、lding 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 Thi
4、s 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 Document
5、s2.1 ASTM Standards:2C 109/C 109M Test Method for Compressive Strength ofHydraulic Cement Mortars (Using 2-in. or 50-mm CubeSpecimens)C 150 Specification for Portland CementC 230/C 230M Specification for Flow Table for Use in Testsof Hydraulic CementC 305 Practice for Mechanical Mixing of Hydraulic
6、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 ConcretesC 778 Specification for Standard SandC 1005 Specification for Reference Masses and Devices forDetermining Mass
7、and Volume for Use in the PhysicalTesting of Hydraulic CementsD 4258 Practice for Surface Cleaning Concrete for CoatingD 4259 Practice for Abrading ConcreteD 4260 Practice for Liquid and Gelled Acid Etching ofConcrete3. Significance and Use3.1 Researchers in the field of coatings have recognized the
8、need 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 exposuretes
9、ting racks, the panels shall be 200 by 300 by 15 mm (8 by12 by916 in.) 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 by916 in.) insize.4.1.3 Other sizes to fit specific equipment may be used.4.2 Trowel, rectangular having a steel bla
10、de 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 C 1005. The weighing device shallbe evaluated for precision and bias at a total
11、 load of 2000 g.4.4 Mechanical MixerAn electrically driven mechanicalmixer of the type equipped with a paddle and mixing bowl, asspecified in Practice C 305.4.5 Flow Table, as described in Specification C 230/C 230M.5. Materials5.1 White Portland Cement, conforming to the requirementsof Type I of Sp
12、ecification C 150.1This 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 Nov. 1, 2007. Published November 2007.
13、Originallyapproved in 1960. Last previous edition approved in 2003 as D 1734 93 (2003).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 Summar
14、y 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 considerati
15、on at a meeting of the responsibletechnical committee,1which you may attend.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 Graded Standard Sand, conforming to the requirementsof Specification C 778.6. Procedure6.1 Preparation of
16、 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 C 109/C 109M. Typically,for three large test panels, weigh out 1800 g of portlandcement, 3600 g of graded sand and 770 g
17、 of water. For threesmall test panels, use 350 g of portland cement, 700 g of sandand 150 g of water.NOTE 1Minor 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 min of mixi
18、ng. Use the trowel to distribute the mixtureand to compact and level it. Tip the trowel slightly, about 30from horizontal, and trowel the mixture from end to endseveral times to achieve compactness and leveling, using onlya slight hand pressure. Again, use the edge of the trowel tostrike excess mate
19、rial from the surface and then, holding thetrowel almost flat, slowly make only a sufficient number ofpasses to produce a smooth and dense surface.NOTE 2Excessive working of a fresh surface may create a cementrich top coat.6.2.2 As the sheen from the water disappears from the panelface (approximatel
20、y 45 to 60 min), trowel the surface again toa hard smooth finish or texture the surface as required.6.2.3 In between trowellings, keep the tools dry and clean.Do not use water on the panel surface nor on the trowel duringthis initial curing period, since this disturbs and weakens thesurface by chang
21、ing the water:cement ratio.6.3 Moist Curing of Panels:6.3.1 Immediately after finishing the surface, place thepanels in a moist chamber conforming to Specification C511or cover and seal them in plastic wrap, taking care as to preventthe plastic from having contact with the panel face.6.3.2 Continue
22、curing for at least seven days under moistconditions as specified in 6.3.1.NOTE 3For optimum repeatability of test results, panels used in thesame test should be from the same batch. The moisture content and age ofthe test panel could also have an effect on test results. Panels older thantwelve mont
23、hs should not be used.NOTE 4Test panels shall be formed in smooth surfaced molds and noform oil or other contaminants shall come in contact with the panelsurface.NOTE 5Surface preparation of the panels before use is beyond thescope of this practice. Guides for surface preparation can be found inPrac
24、tices D 4258, D 4259 and D 4260.7. Keywords7.1 cementitious panels; mortar panels; paint testing panelsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that d
25、etermination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved
26、 or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel
27、that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 1734 93 (2007)2
