ASTM D7379/D7379M-08(2021)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7379/D7379M −08 (Reapproved 2021)
Standard Test Methods for
Strength of Modified Bitumen Sheet Material Laps Using
Cold Process Adhesive
This standard is issued under the fixed designation D7379/D7379M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Significance and Use
3.1 These tests are useful in sampling and testing combina-
1.1 These test methods cover the procedure for sampling
tions of modified bitumen sheet materials used with cold-
and testing the strength of laps formed with adhesive used with
applied adhesives.
polymer-modified bituminous sheet materials.
1.2 The values stated in either SI units or inch-pound units
4. Sampling
are to be regarded separately as standard. The values stated in
4.1 Fromeachshipmentorfractionthereof,selectatrandom
each system may not be exact equivalents; therefore, each
a number of modified bitumen rolls and containers of adhesive
system shall be used independently of the other. Combining
in accordance with the following. Determine the number of
values from the two systems may result in nonconformance
adhesive containers to be sampled in accordance with Practice
with the standard.
D140/D140M. Determine the number of rolls to be selected in
1.3 This standard does not purport to address all of the
accordance with Section 3, Sampling, of Test Methods D146/
safety concerns, if any, associated with its use. It is the D146M.
responsibility of the user of this standard to establish appro-
5. Conditioning
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5.1 Condition test materials for a minimum of4hat23 6
1.4 This international standard was developed in accor-
2 °C [73.4 6 3.6 °F] and 50 6 5 % relative humidity before
dance with internationally recognized principles on standard-
preparing specimens for testing.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- 6. Lap T-Peel Strength
mendations issued by the World Trade Organization Technical
6.1 This test method covers the determination of the T-peel
Barriers to Trade (TBT) Committee.
strength of polymer-modified bituminous sheet material and
cold-applied adhesive combinations.
2. Referenced Documents
6.1.1 Modified Bitumen Samples for Testing—Samples for
testing shall consist of two 140 by 152-mm [5.5 by 6-in.] test
2.1 ASTM Standards:
panels of modified bitumen, bonded with the adhesive to be
D140/D140M Practice for Sampling Asphalt Materials
tested, and cut into 25-mm [1-in.] specimens as shown in Fig.
D146/D146M Test Methods for Sampling and Testing
1. Cut the modified bitumen sheet materials and mate the sides
Bitumen-Saturated Felts and Woven Fabrics for Roofing
to be bonded facing each other.
and Waterproofing
6.1.2 Sides to be bonded shall be prepared in the same
D5147/D5147M Test Methods for Sampling and Testing
fashion as a field seam is constructed with the bottom side of
Modified Bituminous Sheet Material
a top panel bonded to the top side (selvage) of the bottom panel
using the adhesive to be tested.
6.2 Stir the adhesive to be tested until it is uniform. Spread
These test methods are under the jurisdiction of ASTM Committee D08 on
5.0 6 0.3 g of the adhesive evenly over the selvage portion of
Roofing and Waterproofing and are the direct responsibility of Subcommittee
D08.04 on Felts, Fabrics and Bituminous Sheet Materials.
a bottom panel. Place the top panel over the adhesive-coated
Current edition approved July 1, 2021. Published July 2021. Originally approved
area of the bottom panel (as shown in Fig. 1) in the same
ɛ1
in 2008. Last previous edition approved in 2015 as D7379/D7379M – 08 (2015) .
manner, as a field lap would be made.
DOI: 10.1520/D7379_D7379M-08R21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.3 Roll the freshly prepared panel combination three times
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
with a back-and-forth motion, taking care not to move the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. panels during the rolling process. No downward pressure shall
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D7379/D7379M − 08 (2021)
FIG. 1 T-Peel Bonding Configuration for a Modified Bitumen Lap
D7379/D7379M − 08 (2021)
be exerted on the roller by the operator. The roller shall be 7. Lap Shear Strength
placed in direct contact with the 3-in. wide cemented lap
7.1 This test method covers the determination of the shear
portion. The roller shall be 127 mm [5 in.] 6 5 % wide,
strength of adhesives used with polymer-modified bituminous
127 mm [5 in.] 6 5 % in diameter, and shall weigh 11.8 kg
sheet materials.
[26 lb] 65%.
7.1.1 Panels for Test—Prepare pre-cut test panels, as shown
in Fig. 2, by mating the sides to be bonded facing each other.
6.4 Conditioning—Heat condition completed modified bitu-
Sides to be bonded shall be prepared in the same fashion as a
men panels prior to peel testing in a ventilated, forced-air
field seam is constructed; tha
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