1、Designation: C 510 05aStandard Test Method forStaining and Color Change of Single- or MulticomponentJoint Sealants1This standard is issued under the fixed designation C 510; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、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 test method covers an accelerated laboratory pro-cedure to determine if a sample of a joint sealant will stai
3、n 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 regarded as thesta
4、ndard. 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 determine the applica
5、-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C 109 Test Method for Compressive Strength of HydraulicCement Mortars (Using 2-in. or 50-mm Cube Specimens)C 150 Specification for Portland CementC 207 Specification for Hydrated Lime for Masonry Pur-posesC 717
6、 Terminology of Building Seals and SealantsC 1442 Practice for Conducting Tests on Sealants UsingArtificial Weathering ApparatusD 2203 Test Method for Staining from SealantsG113 Terminology Relating to Natural and ArtificialWeathering Tests of Nonmetallic Materials3. Terminology3.1 DefinitionsFor de
7、finitions of terms used in this testmethod, see Terminology C 717 for terms relating to buildingseals and sealants, and Terminology G113for terms relating tonatural and artificial weathering tests.4. Significance and Use4.1 Staining of a building is an aesthetically undesireableoccurance. This test
8、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 is useful to pre
9、dict 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 D 2203, which measuresstaining by a sealant due to gross exudations from t
10、he 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 PracticeC 1442, that use either xenon arc, fluorescent UV or open flamecarbon arc radiation. Consult Pra
11、ctice C 1442 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, nonstaining, co
12、nforming toType I of Specification C 150.6.2 Hydrated Lime, conforming to Type S of SpecificationC 207.6.3 Ottawa Sand, graded, white, conforming to the require-ments of Section 4 of Test Method C 109.6.4 Aluminum Plates, three 152 by 70-mm (6 by 234-in.),No. 16 gage.6.5 Metal Frames, two rectangula
13、r 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 ofASTM Committee C2
14、4 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.40 onWeathering.Current edition approved May 1, 2005. Published June 2005. Originallyapproved in 1963 as C 510 63 T. Last previous edition approved in 2005 asC 510 05.2For referenced ASTM standards, visit the ASTM w
15、ebsite, 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 Conshohocken, PA 19428-2959, United S
16、tates.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, with sufficient water to makea
17、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 the frame, allow the speci-mens
18、 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 of the 4-h curing period descr
19、ibed 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 submitted with a sample, apply
20、 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 2C (73.4 6 3.6F) and 50 6 5 % re
21、lative 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 flame carbon arc tests. The exposu
22、reduration 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 C 1442 for determining the exposuretime required to obtain the same radiant exposure at otherirra
23、diance 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 thelaboratory at 23 6 2C (73.4 6 3.6F) a
24、nd 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 mortar and colorchanges in the
25、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 of the acceleratedweathering m
26、achine 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 eight producers tested nineseal
27、ants 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 validity of any patent rights a
28、sserted 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 subject to revision at any time
29、 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 Headquarters. Your comments will re
30、ceive 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 standard is copyrighted by ASTM In
31、ternational, 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).C 510 05a2
