1、Designation: D 7379 08Standard Test Methods forStrength of Modified Bitumen Sheet Material Laps UsingCold Process Adhesive1This standard is issued under the fixed designation D 7379; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、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 These test methods cover the procedure for samplingand testing the strength of laps formed with adhesive u
3、sed withpolymer-modified bituminous sheet materials.1.2 The values stated in SI units are to be regarded asstandard. The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.3 This standard does not purp
4、ort 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 Standards:2D 1
5、40 Practice for Sampling Bituminous MaterialsD 146 Test Methods for Sampling and Testing Bitumen-Saturated Felts and Woven Fabrics for Roofing and Wa-terproofingD 5147 Test Methods for Sampling and Testing ModifiedBituminous Sheet Material3. Significance and Use3.1 These tests are useful in sampling
6、 and testing combina-tions of modified bitumen sheet materials used with coldapplied adhesives.4. Sampling4.1 From each shipment or fraction thereof, select at randoma number of modified bitumen rolls and containers of adhesivein accordance with the following. Determine the number ofadhesive contain
7、ers to be sampled in accordance with PracticeD 140. Determine the number of rolls to be selected inaccordance with Section 3, Sampling, of Test Methods D 146.5. Conditioning5.1 Condition test materials for a minimum of4hat2362C (73.4 6 3.6F) and 50 6 5 % relative humidity beforepreparing specimens f
8、or testing.6. Lap T-Peel Strength6.1 This test method covers the determination of the T-peelstrength of polymer-modified bituminous sheet material andcold applied adhesive combinations.6.1.1 Modified Bitumen Samples for TestingSamples fortesting shall consist of two 140 by 152 mm (5.5 by 6 in.) test
9、panels of modified bitumen, bonded with the adhesive to betested, and cut into 25 mm (1 in.) specimens as shown in Fig.1. Cut the modified bitumen sheet materials and mate the sidesto be bonded facing each other.6.1.2 Sides to be bonded shall be prepared in the samefashion as a field seam is constru
10、cted with the bottom side ofa top panel bonded to the top side (selvage) of the bottom panelusing the adhesive to be tested.6.2 Stir the adhesive to be tested until it is uniform. Spread5.0 6 0.3 g of the adhesive evenly over the selvage portion ofa bottom panel. Place the top panel over the adhesiv
11、e-coatedarea of the bottom panel (as shown in Fig. 1) in the samemanner, as a field lap would be made.6.3 Roll the freshly prepared panel combination three timeswith a back-and-forth motion, taking care not to move thepanels during the rolling process. No downward pressure shallbe exerted on the rol
12、ler by the operator. The roller shall beplaced in direct contact with the 3-in. wide cemented lapportion. The roller shall be 127 mm (5 in.) 6 5 % wide, 127mm (5 in.) 65 % in diameter, and shall weigh 11.8 kg (26 lb)65%.6.4 ConditioningHeat condition completed modified bi-tumen panels prior to peel
13、testing in a ventilated, forced airconvection oven at 70 6 3C (158 6 5F) for 7 days 6 2h.Panels are to be placed in the oven within 24 h of preparation.6.4.1 After conditioning, allow panels to come to constanttemperature at 23 6 2C (73.4 6 3.6F) and 50 6 5%humidity for 24 6 1 h prior to testing.1Th
14、ese test methods are under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.04on Felts and Fabrics.Current edition approved June 1, 2008. Published July 2008.2For referenced ASTM standards, visit the ASTM website, www.astm.org, o
15、rcontact 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 States.FIG. 1 T-Peel Bon
16、ding Configuration for a Modified Bitumen LapD73790826.5 SpecimensPrepare five die cut test specimens fromeach panel. Discard the outer 5 mm (0.13 in.) of each panel toavoid any edge effects. Specimens shall be 25.4 6 0.2 mm (16 0.01 in.) by 152 6 2mm(66 0.05 in.) long. Specimens fortesting shall in
17、corporate a 25.4 6 0.2 mm (1 6 0.01 in.) by 766 0.6 mm (3.0 6 0.03 in.) bonded area, as shown in Fig. 1.6.6 ProcedureTest each specimen in accordance with TestMethods D 5147, Section 6. Set the edges of the clamps apart25 6 0.2 mm (1 6 0.01 in.), and maintain a rate of separationof 51 6 1.5 mm/min.
18、(2.0 6 0.06 in./min). Specimen peelstrength shall be measured over the interval between 25 6 0.2mm (1 6 0.01 in.) and 152 6 1 mm (6.0 6 0.05 in.) ofseparation.6.7 PrecisionThe following data should be used forjudging the acceptability of results (95 % probability) onsamples from the same lot from th
19、e same supplier.6.7.1 Repeatability and ReproducibilityFor materials inthe peak peel strength range of 1751 to 2276 N/m (10 to 13lbf/in.), Sr, the repeatability standard deviation, averaged 274N/m (1.57 lbf/in.). The 95 % repeatability range was 6550N/m (3.14 lbf/in.) or 27 % around the true average
20、, 2031 N/m(11.6 lbf/in.). The reproducibility standard deviation, SR, aver-aged = 431 N/m (2.46 lbf/in.). The 95 % reproducibility rangewas 6862 N/m (4.92 lbf/in.) or 42 % around the true average.6.7.2 Repeatability and ReproducibilityFor materials inthe average peel strength range of 1436 to 1716 N
21、/m (8.2 to 9.8lbf/in.), Sr, the repeatability standard deviation, averaged 144N/m (0.82 lbf/in.). The 95 % repeatability range was 6364N/m (2.08 lbf/in.) or 22.5 % around the true average, 1611 N/m(9.2 lbf/in.). The reproducibility standard deviation, SR, aver-aged = 352 N/m (2.01 lbf/in.). The 95 %
22、 reproducibility rangewas 6704 N/m (4.02 lbf/in.) or 42 % around the true averageof 1615 N/m (9.22 lbf/in.).7. Lap Shear Strength7.1 This test method covers the determination of the shearstrength of adhesives used with polymer modified bituminoussheet materials.7.1.1 Panels for TestPrepare pre-cut t
23、est panels, as shownin Fig. 2, by mating the sides to be bonded facing each other.Sides to be bonded shall be prepared in the same fashion as afield seam is constructed; that is, the bottom side of a top panelis bonded to the selvage portion of a bottom panel with theadhesive to be tested.7.2 Prepar
24、e specimens for test as in 6.2 through 6.3 aboveexcept that shear test specimens shall be constructed as shownin Fig. 2.7.3 Condition as in 6.4.7.4 SpecimensPrepare five die cut test specimens fromeach panel. Discard the outer 5 mm (0.13 in.) of each panel.Specimens shall be 25 6 0.2 mm (1 6 0.01 in
25、.) by 152 6 2mm (6.0 6 0.05 in.) long. Specimens for test shall incorporatea 25.4 6 0.2 mm (1 6 0.01 in.) by 76 6 0.6 mm (3 6 0.03 in.)bonded area, as shown in Fig. 2.7.5 ProcedureAfter specimens have been heat condi-tioned for the specified time, test each specimen in accordancewith Test Methods D
26、5147, Section 6. Set the edges of theclamps apart 82.5 6 0.5 mm (3.25 6 0.03 in.), and maintain arate of separation of 51 6 2 mm/min. (2.0 6 0.06 in./min).Specimen shear strength shall be measured until sampleseparation is complete.7.6 Precision and BiasThe following data should be usedfor judging t
27、he acceptability of peak peel and average peelstrength results with a 95 % probability.7.6.1 Repeatability and ReproducibilityFor materials inthe peak shear strength range of 53.04 to 71.69 N/m (46.99 to63.51 lbf/in.), Sr, the repeatability standard deviation, averaged8.02 N/m (7.10 lbf/in.). The 95
28、 % repeatability range was616.04 N/m (14.21 lbf/in.) or 25.7 % around the true average,62.36 N/m (55.24 lbf/in.). The reproducibility standard devia-tion, SR, averaged = 18.19 N/m (16.11 lbf/in.). The 95 %reproducibility range was 641.08 N/m (36.39 lbf/in.) or 74 %around the true average of 55.24.8.
29、 Report8.1 Report the peak and average peel strength and the peakshear strength values in N/m (lbf/in.) for each specimen, andthe average of specimens for each combination of adhesive andmembrane tested.9. Keywords9.1 cold process adhesive; lap; modified bituminous sheetmaterial; SBS; shear strength
30、; T-peel strengthD7379083ASTM 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 patent rights, and the riskof infring
31、ement of such rights, are entirely their own responsibility.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
32、or for additional standardsand should be addressed 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
33、known to the ASTM Committee on Standards, at the 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. 2 Shear Strength Bonding Configuration for a Modified Bitumen LapD7379084
