1、Designation: D 7051 05Standard Test Method forCyclic Thermal Shock of SBS-Modified Bituminous RoofingSheets with Factory-Applied Metal Surface1This standard is issued under the fixed designation D 7051; the number immediately following the designation indicates the year oforiginal adoption or, in th
2、e case of revision, 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 test method covers the measurement of movementdue to cyclic thermal exposure of
3、SBS (styrene-butadiene-styrene)-modified bituminous sheets with a factory-appliedmetal foil surface.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, ass
4、ociated 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 Standards:2C 552 Specification for Cellular Glass Thermal Insulatio
5、nD41 Specification for Asphalt Primer Used in Roofing,Dampproofing, and WaterproofingD 312 Specification for Asphalt Used in RoofingD 5147 Test Methods for Sampling and Testing ModifiedBituminous Sheet Material3. Summary of Test Method3.1 This test consists of exposing two specimens of 2000 65by906
6、5 mm (78.7 6 0.2 by 3.5 6 0.2 in.) to cycles oftemperature produced by infrared radiation. The variation inthe specimen length dimension is measured in relation to thenumber of cycles and temperature variation. This test applies tometal foil surfaced SBS-modified bitumen roofing sheets.4. Significan
7、ce and Use4.1 This test method is used to determine the dimensionalchanges and physical stability of the product upon exposure tospecified cyclic thermal conditions. It is also useful in deter-mining the integrity of the bond between the metal foil and theSBS-modified bituminous compound.5. Apparatu
8、s5.1 The apparatus and test assembly as shown in Figs. 1-4consists of the following components.5.2 A hollow metal, rigid support or base on which the testsample is mounted, hereafter referred to as the shock table. Thebase shall be 2110 6 25 mm long by 280 6 25 mm wide by125 6 13 mm tall (83 6 1.0 i
9、n. long by 11 6 1.0 in. wide by5 6 0.5 in. tall). The shock table shall have water inlet andoutlet attachments mounted such that the support is always fullof circulating water. This is done to avoid expansion orcontraction of the shock table during the test.NOTE 1The support can be easily constructe
10、d by welding two piecesof wide channel iron together with the addition of end plates.5.3 Mounting brackets for the measuring devices shall beattached to the shock table such that the measuring device islevel with and facing the metal reference tabs attached to thefoil surface of the specimens (see 6
11、.4).5.4 Linear transducers, or dial indicators, accurate to 10 m(0.4 mil) shall be used to measure the change in distancebetween the adhered metal reference tab and the mountedindicator.5.5 Six or more 250 W infrared heating lamps are mountedabove the support equally spaced across the 2000 mm (79 in
12、.)test length.NOTE 2The number of lamps is not critical as long as the temperatureis accurate and consistent.5.6 Sheet metal panels, or other suitable protection, shall bemounted on the sides and ends of the hollow support to reducedrafts and temperature fluctuations during the test. The panelsshoul
13、d be easily removed to allow for daily observations of thetest assembly.5.7 A regulating system shall be used to maintain the timingof the heating and cooling cycles. Temperature may bemaintained automatically or manually, but the temperatureshall be measured using thermocouples.1This test method is
14、 under the jurisdiction ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.04 on Feltsand Fabrics.Current edition approved May 1, 2005. Published June 2005.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer
15、 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 States.6. Preparation of Apparatus6.1 The top
16、surface of the shock table shall be primed withSpecification D41asphalt primer and allowed to dry. Specifi-cation C 552 Type IV, board cellular glass thermal insulation38 mm (1.5 in.) thick shall be cut to fit the shock table. Thecellular glass insulation shall then be bonded to the primedmetal base
17、 with Specification D 312 Type IV asphalt.6.2 Place the thermocouples on the insulation surface and,with side shields in position, adjust the height of the infraredheating lamps until the test temperature is attained. This willserve as the initial lamp height. Remove the thermocouples.6.3 Test speci
18、mens of the SBS metal foil surfaced SBS-modified bitumen sheets are bonded directly to the cellularglass insulation using a pour and roll method with an Specifi-cation D 312 Type IV asphalt applied at 218 6 14C (425 625F). The specimens are applied parallel to each other, andshall be separated by a
19、distance of 40 6 10 mm (1.6 6 0.4 in.).If polyolefin film backing exists, it shall be carefully meltedaway, and dusted with a parting agent before applying thespecimens with asphalt.6.4 Metal reference tabs, minimum 0.5 mm (28 ga) thick,shall be attached to the foil surface at both ends of eachspeci
20、men, and shall be used as the reference points. The metalreference tabs shall be bent at a 90 angle, and shall be adheredusing a two-component epoxy adhesive. See Figs. 1-3 for metaltab shape and placement.6.5 After adhering the metal reference tabs, paint the foilsurface of the specimens using flat
21、 black spray paint. The paintprovides for consistent surface temperature regardless of themetal foil type. Avoid painting the index tabs.7. Conditioning7.1 Condition test specimens according to Test MethodsD 5147.FIG. 1 Shock TableTop ViewFIG. 2 Shock TableEnd ViewsD70510528. Procedure8.1 Linear tra
22、nsducers or dial indicators shall be mounted tothe metal base facing the metal reference tabs that are adheredto the test specimens. See Figs. 1-4. The change in dimensionalmovement shall be measured between these two referencepoints.8.2 Position a minimum of two thermocouples on thesurface of the s
23、pecimens. The average temperature from thethermocouples shall be used to control the surface temperatureof specimens at 73 6 5C (163 6 9F). Prior to the first heatingcycle measure and record the initial gap setting between thereference points, and use this as the zero point. During the lastFIG. 3 Sh
24、ock TableSide ViewFIG. 4 Shock TableISO ViewD7051053ten minutes of each cooling and heating period, measure andrecord the change in dimension (mm) at each end of the testspecimens.8.3 Each cycle shall include one heating and one coolingperiod, and shall be a minimum of 6 h. The cooling period shallb
25、e permitted to be extended to allow for non-monitored periodssuch as at night or weekends when non-automated systems arein use.8.3.1 Heating Period4 h 6 10 min of heating at 73 6 5C(163 6 9F).8.3.2 Cooling Period2 h 6 10 min of cooling at 23 6 3C(73 6 5F).8.4 Subject the specimens to 30 cycles.NOTE
26、3Non-automated systems shall be permitted to be used whenautomated systems are not available.9. Calculation or Interpretation of Results9.1 Calculate the percent dimensional change for eachspecimen after each heating and cooling period. From the datacollected in 8.2, add the changes in dimension (mm
27、) at bothends of the specimen. This is DL. Divide this value by theinitial specimen length (Lo) and multiply by 100.DL / Lo!3 100 5 % dimensional change per half cycle9.2 Plot the percent change in dimension after each halfcycle (after each heating period and cooling period) for bothspecimens. See F
28、ig. 5 for an example graph showing thenumber of cycles on the X-axis and the percent (%) dimen-sional change on the Y-axis. Examine the specimens daily forwrinkling, buckling, or disbonding from the insulation sub-strate, or delamination of the foil surfacing from the SBS-modified bitumen compound.
29、If any of these conditions areobserved, the test shall be terminated. Daily examination shallbe permitted to be suspended to allow for non-monitoredperiods as described in 8.3.10. Report10.1 Report the percent dimensional change for each speci-men at the end of 30 cycles. Include the plot described
30、in 9.2in the report. Report any wrinkling, buckling, or disbonding ofindividual specimens from the insulation substrate, or delami-nation of the foil surfacing from the SBS-modified bitumencompound, and the cycle number the observation was made.11. Precision and Bias11.1 At the present time, there i
31、s no basis for statementsconcerning the precision and bias of test results obtained fromeither within-laboratory or between-laboratory testing.12. Keywords12.1 cyclic thermal shock; foil faced; modified bitumen;SBS-modified bituminous sheets; styrene-butadiene-styreneD7051054ASTM International takes
32、 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 patent rights, and the riskof infringement of such rights, are entirely their own resp
33、onsibility.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 or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addresse
34、d to ASTM International Headquarters. 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
35、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).FIG. 5 Cyclic Thermal Shock Test (Sample Graph)D7051055
