1、Designation: C510 05a (Reapproved 2011)Standard Test Method forStaining and Color Change of Single- or MulticomponentJoint Sealants1This standard is issued under the fixed designation C510; the number immediately following the designation indicates the year oforiginal adoption or, in the case of rev
2、ision, 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 test method covers an accelerated laboratory pro-cedure to determine if a sample of a joint se
3、alant will stain thesubstrate when in contract with masonry, concrete, or stone(such as marble, limestone, sandstone, and granite). This testmethod also is intended to determine whether the sealant itselfwill change in color when exposed to the weather.1.2 The values stated in SI units are to be reg
4、arded as thestandard. The value 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 determ
5、ine 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 CementC207 Specification for Hydrated Lime for Mason
6、ry Pur-posesC717 Terminology of Building Seals and SealantsC1442 Practice for Conducting Tests on Sealants UsingArtificial Weathering ApparatusD2203 Test Method for Staining from SealantsG113 Terminology Relating to Natural andArtificial Weath-ering Tests of Nonmetallic Materials3. Terminology3.1 De
7、finitionsFor definitions of terms used in this testmethod, see Terminology C717 for terms relating to buildingseals and sealants, and Terminology G113 for terms relating tonatural and artificial weathering tests.4. Significance and Use4.1 Staining of a building is an aesthetically undesireableoccura
8、nce. This test method evaluates the likelihood of asealant causing early stain on a porous substrate due to certainchemical exudations from the sealant.4.1.1 This test method may not predict staining caused bysuch factors as residue run-down or dirt pick-up by a sealantexudate.4.2 This test method i
9、s useful to predict potential colorchanges in the sealant itself after weathering.4.3 This test method measures color change in a sealant andstaining of substrate by the sealant under conditions of artificialweathering. See also Test Method D2203, which measuresstaining by a sealant due to gross exu
10、dations from the sealant;it does not subject the sealant to artificial weathering.5. Apparatus5.1 The exposure apparatus shall be one of the three types oflaboratory accelerated weathering devices described in PracticeC1442, that use either xenon arc, fluorescent UV or open flamecarbon arc radiation
11、. Consult Practice C1442 for the differ-ences in test parameters among the devices. Because ofdifferences in test conditions, test results may differ with thetype of device used. The choice of device shall be by mutualagreement among the interested parties.6. Materials6.1 Portland Cement, white, non
12、staining, conforming toType I of Specification C150.6.2 Hydrated Lime, conforming to Type S of SpecificationC207.6.3 Ottawa Sand, graded, white, conforming to the require-ments of Section 4 of Test Method C109/C109M.6.4 Aluminum Plates, three 152 by 70-mm (6 by 234-in.),No. 16 gage.6.5 Metal Frames,
13、 two rectangular noncorrosive, designatedas A and B; frame A shall be 6 mm (14 in.) thick with the insideopening slightly larger than an aluminum plate described in6.4; frame B shall have inside dimensions of 127 by 38 by 6mm (5 by 112 by14 in.) thick.1This test method is under the jurisdiction ofAS
14、TM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.40 onWeathering.Current edition approved June 1, 2011. Published August 2011. Originallyapproved in 1963. Last previous edition approved in 2005 as C510 05a. DOI:10.1520/C0510-05AR11.2For referenced A
15、STM 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consho
16、hocken, PA 19428-2959, United States.7. Test Specimens7.1 The test specimen shall consist of a slab of mortar mixupon which is placed a layer of sealant.7.2 The mortar mix shall be prepared by combining, byweight, 1 part white portland cement, 0.25 part hydrated lime,and 4 parts graded Ottawa sand,
17、with sufficient water to makea smooth, workable paste (water-cement ratio = 0.8).7.3 The mortar mix shall be spread, with the aid of frame A,over the entire surface of each of the three aluminum plates toa depth approximately 6 mm (14 in.) and struck off flat with aspatula. After carefully removing
18、the frame, allow the speci-mens to cure in air for4hat236 2C (73.4 6 3.6F) and 506 5 % relative humidity.8. Conditioning8.1 Store the unopened sample of one- or two-part sealant at23 6 2C (73.4 6 3.6F) and 50 6 5 % relative humidity for16 to 24 h immediately before testing.9. Procedure9.1 At the end
19、 of the 4-h curing period described in 7.3,spread a 6-mm (14-in.) thick layer of sealant, with the aid offrame B, over the surface of two of the three specimens,leaving a margin of approximately 13 mm (12 in.) of mortarfree of sealant. Leave the third specimen without sealant.9.1.1 Where a primer is
20、 submitted with a sample, apply theprimer in accordance with the manufacturers directions to halfthe surface of the cured mortar of the three specimens beforeapplication of the sealant. For two-part sealants, mix approxi-mately 200 g.9.2 Then expose the three specimens in air for 16 to 24 h at23 6 2
21、C (73.4 6 3.6F) and 50 6 5 % relative humidity.9.3 After the 16 to 24-h curing period, place at least fourspecimens, two with and two without sealant, on the inside ofthe accelerated weathering machine. The exposure durationshall be a minimum of 100 h for the fluorescent UV/condensation and open fla
22、me carbon arc tests. The exposureduration for the xenon arc test shall be a minimum of 184kJ/(m2 nm) at 340 nm. This is based on a minimum of a 100-hexposure at an irradiance level of 0.51 W/(m2 nm) at 340 nm.See Annex A1 in Practice C1442 for determining the exposuretime required to obtain the same
23、 radiant exposure at otherirradiance levels.NOTE 1The minimum exposure duration may not be sufficient toidentify an unaceptable material.9.3.1 Specimen temperature shall be 60 6 2.8C (140 65F) and water temperature 24 6 2.2C (75 6 4F).9.4 Expose the third specimen (with sealant) in air in thelaborat
24、ory at 23 6 2C (73.4 6 3.6F) and 50 6 5 % relativehumidity for 14 consecutive days. During this exposure periodimmerse the third specimen in distilled water for 1 min once aday (5 days per week).9.5 At the end of the exposure periods, examine the speci-mens containing the sealant for stains in the m
25、ortar and colorchanges in the sealant. Use the mortar specimen without thesealant as a control.10. Report10.1 Report a stain if there is any discoloration in the mortarcolor of the sealant test specimens when compared with themortar color of the control specimen.10.2 Report the name and description
26、of the acceleratedweathering machine and its test conditions.10.3 Record a color change if there is any variation in colorof the sealant specimen that has been placed in the weatheringmachine and the sealant specimen exposed under laboratoryconditions.11. Precision11.1 In a round-robin test series e
27、ight producers tested ninesealants for stain and colorchange properties. Excellent agree-ment was obtained by the testing laboratories among the 432determinations that were completed in the test series.12. Keywords12.1 color change; sealant; stainASTM International takes no position respecting the v
28、alidity of any patent rights asserted in connection with any 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 s
29、ubject to revision at any time by the responsible technical 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 Headq
30、uarters. Your comments will receive careful consideration at 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 stan
31、dard 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C510 05a (2011)2
