1、Designation: D 6904 03 (Reapproved 2007)Standard Practice forResistance to Wind-Driven Rain for Exterior CoatingsApplied on Masonry1This standard is issued under the fixed designation D 6904; the number immediately following the designation indicates the year oforiginal adoption or, in the case of r
2、evision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice is for the evaluation of the ability ofcoatings to resist the passage of water thr
3、ough masonry blockwhen exposed to water spray and air pressure.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does
4、 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 Stand
5、ards:2D 1475 Test Method For Density of Liquid Coatings, Inks,and Related ProductsD 3924 Specification for Environment for Conditioning andTesting Paint, Varnish, Lacquer, and Related MaterialsD 3925 Practice for Sampling Liquid Paints and RelatedPigmented Coatings2.2 Federal Standard:TT-C-555B Coat
6、ing, Textured (For Interior and ExteriorMasonry Surfaces)33. Summary of Practice3.1 Typically 8 by 16 by 2 in. masonry blocks are coatedwith block filler and then coated with the masonry paint andallowed to cure. The coated blocks are then secured to a testapparatus and exposed for 24 h to continuou
7、s water spray andair pressure or as agreed upon between manufacturer andsupplier. Upon completion of the exposure, the blocks areremoved, evaluated for visible water leaks or weight gain, orboth.4. Significance and Use4.1 This practice is meant to simulate the ability of a coatingsystem applied to a
8、 masonry block to withstand exposure tocontinuous water spray (rain) and a dynamic pressure equiva-lent to a 98 mph wind velocity without exhibiting water leaksor weight gain, or both.5. Apparatus5.1 The testing box is assembled from transparent plasticpanels12-in. thick and typically of the dimensi
9、ons as shown inFig. 1. Three openings on the side, 6 by 12 in., are provided sothat the coated side of the three blocks may be positioned fortest. The openings on the top of the apparatus for the air inletand manometer connection shall not be less than 3 in. apart tomake certain that air inlet turbu
10、lence will not effect themanometer readings. A spray tube shall be constructed from12-in. plastic tubing with three fish-tail nozzles.4Attachment tothe testing box includes a water-filled U-tube manometer,source of compressed air, clamps and angle irons for securelyfastening the test panels to the b
11、ox, and a drain outlet. Also,illustrated is a simple air pressure regulator consisting of aT-tube with the leg (foot) of the tube placed in a water filledbeaker at a depth of slightly greater than 5 in. This set up is alsoa safety device. Any sudden increase in air pressure will bevented harmlessly.
12、 The apparatus outlined above was derivedfrom that shown in Federal Specification TT-C-555B. Appara-tus and substrates of other dimensions can be used as agreedupon between manufacturer and supplier. The duration ofexposure and water pressure used will also be agreed uponbetween manufacturer and use
13、r.6. Reagents and Materials6.1 Three 8 by 16 by 2 in. Patio Blocks.6.2 Stiff Bristle Brush.6.3 Mortite or Rubber Gasket, to assure a tight fit of thepatio blocks to the test apparatus.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applicat
14、ions and is the direct responsibility ofSubcommittee D01.47 on Concrete, Stone and Masonry Treatments.Current edition approved Nov. 1, 2007. Published November 2007. Originallyapproved in 2003. Last previous edition approved in 2003 as D 6904 - 03.2For referenced ASTM standards, visit the ASTM websi
15、te, 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 U.S. Government Printing Office Superintendent of Documents,732 N. Capitol St., NW, Mail Stop: SD
16、E, Washington, DC 20401, http:/www.access.gpo.gov.4Federal Specification TT-C-555B, Amendment No. 1, dated August 5, 1975,U.S. Government Printing Office.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.4 Clamps and Angle Irons.6.5
17、Wind-Driven Rain Apparatus, (an example is shown inFig. 1).6.6 Source of Compressed Air.6.7 Water Source.7. Sampling7.1 Sampling of both block filler, if used, and topcoat shallbe conducted in accordance with procedures outlined inPractice D 3925.8. Procedure8.1 Prepare patio blocks by using a stiff
18、 bristle brush toremove any loose materials.8.2 Assure that blocks are dried and have been stored in anarea under standard conditions of 73.5 6 3.5F (23 6 2C) and50 6 5 % relative humidity as outlined in SpecificationD 3924.8.3 Apply block filler, if required, in accordance withmanufacturers instruc
19、tions or at a recommended spreading rateof 100 6 10 ft2/gal to three blocks. It may be advisable to usea scrub brush for this application to assure that all the voids inthe block are filled before applying the test coat. Determine thedensity of the block filler in accordance with proceduresoutlined
20、in Test Method D 1475 and apply the coating at thespreading rate specified using the following equation:Grams of Paint Needed 5454 3 Density lb/gal!3Area in.2Block!144 3 Spreading Rate ft2/gal!(1)NOTE 1Ablock filler may not be suitable for all coatings applications,such as clear water repellents.8.4
21、 Allow block filler to dry at least overnight or permanufacturers instructions.8.5 Apply topcoat using a good quality nylon/polyesterbrush over the block filler at the manufacturers recommendedspreading rate. Use the equation outlined in 8.3 to determinethe amount of test paint needed.8.6 Allow test
22、 blocks to dry for seven days at standardconditions, or as agreed upon between manufacturer andsupplier.8.7 The three coated masonry panels to be tested will beplaced against the openings in the test box with the coated sidefacing the spray unit. Either rubber gaskets, a suitable caulkingcompound or
23、 mortite may be used to provide an air and watertight seal. The angle irons shall be positioned and clampedtightly.8.8 The water shall be started through the spray unit at a rateof between 60 and 70 gal/h, as measured by the waterdischarged.8.9 After the drain opening is covered with dischargingwate
24、r, the air supply shall be adjusted so that pressure producedinside will be 5 in. as measured by the manometer. The test isFIG. 1 Dimensions of Test BoxD 6904 03 (2007)2made at 5 in. of water pressure, which is the equivalentdynamic pressure at 98 mph wind velocity.8.10 Expose the test panels for 24
25、 h to the above mentionedconditions, unless there is obvious water penetration of thecoated panels sooner than that. Water penetration will be notedby visible water leaks or if the rear face on the coated block isdamp.8.11 If required, remove the test blocks from the apparatusand determine the gain
26、in weight of the test block.9. Interpretation of Results9.1 The pass/fail criteria will be as agreed upon betweenmanufacturer and user.NOTE 2Federal Specification TT-C-555B, from which this testmethod is derived, was intended for pigmented coatings and required thatthere be no visible water leaks, a
27、nd if the rear face of the block is damp,the average gain in weight of the three 8 by 16 by 2 in. blocks shall be lessthan 0.2 lb.NOTE 3This practice has been used for clear concrete sealers. Theduration of exposure and water pressure used will be agreed upon betweenmanufacturer and user.10. Report1
28、0.1 Any visible water leaks.10.2 Average weight gain of blocks, if required.10.3 Block filler used.10.4 Any deviations from the above practice.11. Keywords11.1 wind-driven rain resistanceASTM International takes no position respecting the validity of any patent rights asserted in connection with any
29、 item mentionedin this standard. Users of this standard are expressly advised that determination 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
30、committee and must be reviewed every five years andif not revised, either reapproved 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
31、 a meeting of theresponsible technical committee, which you may attend. If you feel 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 D
32、rive, 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 6904 03 (2007)3
