1、Designation: C1815 17Standard Practice forPeriodically Measuring and Monitoring Sealant Dimensionsto Stability Following a Period of Compression or Tension1This standard is issued under the fixed designation C1815; the number immediately following the designation indicates the year oforiginal adopti
2、on 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.1. Scope1.1 This practice covers a procedure for measuring andmonitoring the physical
3、dimensions of an elastomeric jointsealant in a test specimen configuration described in TestMethod C719 following a period of compression or tension.These sealant materials are typically highly filled elasticmaterials. The dimensional change of these sealant materials isdetermined by measuring the d
4、imensions at specific intervalsover a period of time.1.2 The values stated in SI units are to be regarded asstandard. The values in parentheses are for information only.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility o
5、f the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establ
6、ished in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:C717 Terminology of Building Seals and SealantsC719 Test Method f
7、or Adhesion and Cohesion of Elasto-meric Joint Sealants Under Cyclic Movement (HockmanCycle)C1589 Practice for Outdoor Weathering of ConstructionSeals and SealantsC1735 Test Method for Measuring the Time DependentModulus of Sealants Using Stress RelaxationE631 Terminology of Building Constructions3.
8、 Terminology3.1 Definitions:3.1.1 For definitions of terms used in this practice, refer toTerminologies E631 and C717.4. Summary of Practice4.1 This practice consists of monitoring the dimensionalchange of a sealant for a period of time required to establishdimensional stability.4.2 The motivation f
9、or this practice is to monitor thedimensions of a sealant at any time, but especially after aperiod of extended tension or compression to establish thestable dimensions of that sealant. The latter is used in appli-cation of a standard, such as Test Method C1735, by using theaccurate dimensions deter
10、mined by this practice after dimen-sional stability is attained.4.3 This practice will enable determination of the stabledimensions of a sealant. It will also allow the reporting of thetime scale over which the sealant dimensions are changing.5. Significance and Use5.1 Many sealants have been observ
11、ed to dimensionallychange following a period of compression or tension, such asoccurs during exposure in accordance with Practice C1589.Ithas been shown that for some sealants, increasing exposure toweathering increases the time required for dimensional stabil-ity and decreases the magnitude of dime
12、nsional change.Dimensional stability and knowledge of the stable sealantdimensions are critical to the accurate measurement of thesealants modulus by a test such as Test Method C1735.5.2 This practice will find application in improving theaccuracy of the modulus determined by a standard such as Test
13、Method C1735 by using the accurate dimensions determinedby this practice after stability is attained.6. Apparatus6.1 Dimensional Measuring ToolA micrometer, such asdigital calipers, capable of measuring the dimensions ofaluminum substrate and sealant to an accuracy of at least60.05 mm (60.002 in.),
14、is required. An accurate measurementof the geometry is critical. For example, for a 12.5 mm thicksealant that will experience a 15 % strain when tested inaccordance with Test Method C1735, the total deflection is1This practice is under the jurisdiction of ASTM Committee C24 on BuildingSeals and Seal
15、ants and is the direct responsibility of Subcommittee C24.20 onGeneral Test Methods.Current edition approved Nov. 1, 2017. Published November 2017. DOI:10.1520/C1815-17.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international
16、 standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1
17、1.875 mm. For measurement accuracy of3%ofthis value,measurement of 60.05 mm is required.NOTE 1The members of C24.20 were able to measure the dimensionsof three different sealants to a precision of 60.05 mm using a digitalmicrometer.7. Procedure7.1 Measure the dimensions of the specimen at the standa
18、rdconditions of temperature and relative humidity defined inTerminology C717. Measurements of the specimen dimensionsat other ambient temperature and relative humidity conditionsmay be performed but should be reported in 8.1.4.7.2 The test specimen shall be measured with a precision of60.05 mm in al
19、l three dimensions (width, height, and thick-ness).7.2.1 The jaws of the geometry measuring tool described in6.1 will be positioned at the midpoint of the width, or thicknessof the sample. The jaws of the geometry measuring tool will beclosed until the jaws make contact with the sealant. At thispoin
20、t, the dimensions indicated by the geometry measuringtool are recorded.7.2.2 For the measurement of the height of the sample, thejaws of the dimensional measuring tool described in 6.1 will bepositioned between the substrates. The jaws of the dimensionalmeasuring tool will be opened until the jaws m
21、ake contact withthe metal supports of the sealant when the dimensionalmeasuring tool is vertically aligned with the height of thesealant. At this point, the dimension indicated by the dimen-sional measuring tool is recorded.7.2.3 This procedure will be repeated at regular intervalsuntil three subseq
22、uent readings are equivalent within 60.1mm. Regular intervals would be determined to document howthe sealant is changing.8. Report8.1 Report the following information:8.1.1 Identification of the sealant measured, including type,source, manufacturer code number, and curing conditionsemployed.8.1.2 Id
23、entification of the substrates measured.8.1.3 Name and description of primers that were used, ifany,8.1.4 Temperature and relative humidity,8.1.5 Number of specimens tested,8.1.6 Description of the sealant appearance, and8.1.7 Records in terms of dimensions as a function of time.9. Keywords9.1 compr
24、ession; dimensional stability; recovery; sealant;tension;ASTM 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 determination of the validity of any such paten
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