ASTM D7056-07(2018)

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: D7056 − 07 (Reapproved 2018)
Standard Test Method for
Determining the Tensile Shear Strength of Prefabricated
Bituminous Geomembrane Seams
This standard is issued under the fixed designation D7056; 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 D5199 Test Method for Measuring the Nominal Thickness
of Geosynthetics
1.1 This test method presents the procedures used for
E691 Practice for Conducting an Interlaboratory Study to
determining the quality of prefabricated bituminous geomem-
Determine the Precision of a Test Method
brane (PBGM) bonded seams subjected to a shear test. It
describes a destructive quality control test used to determine
3. Terminology
the integrity of PBGM seams.
3.1 Definitions of Terms Specific to This Standard:
1.2 This test procedure is intended for PBGMs only.
3.1.1 geomembrane, n—anessentiallyimpermeablegeosyn-
1.3 The type of thermal field seaming technique used to
thetic composed of one or more synthetic sheets.
construct PBGM seams include the following.
3.1.2 geosynthetic, n—a planar product manufactured from
1.3.1 Torch-On—This technique melts two PBGM surfaces
bitumen or polymeric material used with soil, rock, earth, or
to be seamed by running a flame from a propane torch between
other geotechnical engineering-related material as an integral
them.Pressureisappliedonthetoporbottom,orbothPBGMs,
part of a man-made project, structure, or system.
forcing together both surfaces to form a continuous bond.
1.3.2 Hot Air—This technique introduces high-temperature
3.1.3 geotextile, n—any permeable textile material used in
air or gas between two PBGM surfaces to facilitate melting.
foundation, soil, rock, earth, or any other geotechnical
Pressure is applied on the top or bottom, or both PBGMs,
engineering-related material, as an integral part of a man-made
forcing together both surfaces to form a continuous bond.
project, structure, or system.
1.4 This standard does not purport to address all of the
3.1.4 prefabricated bituminous geomembrane (PBGM),
safety concerns, if any, associated with its use. It is the
n—a material fabricated in a plant and consisting principally of
responsibility of the user of this standard to establish appro-
nonwoven polyester textile, impregnated by a blend of oxi-
priate safety, health, and environmental practices and deter-
dized or polymer-modified bitumen incorporating filler.
mine the applicability of regulatory limitations prior to use.
3.1.5 quality assurance, n—all planned and systematic ac-
1.5 This international standard was developed in accor-
tions necessary to provide adequate confidence that an item or
dance with internationally recognized principles on standard-
a facility will perform satisfactorily in service.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
3.1.6 quality control, n—the operational techniques and the
mendations issued by the World Trade Organization Technical
activities, which sustain a quality of material, product, system,
Barriers to Trade (TBT) Committee.
or service that will satisfy given needs; also the use of such
techniques and activities.
2. Referenced Documents
2.1 ASTM Standards:
4. Significance and Use
D638 Test Method for Tensile Properties of Plastics
4.1 The use of PBGM as barrier materials to restrict liquid
migration from one location to another in soils has created a
This test method is under the jurisdiction of ASTM Committee D35 on
need for a standard test method to evaluate the quality of
Geosynthetics and is the direct responsibility of Subcommittee D35.10 on Geomem-
PBGM seams. In the case of PBGMs, it has become evident
branes.
that seams can exhibit separation in the field under certain
Current edition approved Feb. 1, 2018. Published February 2018. Originally
conditions.Although this is an index-type test method used for
approved in 2004. Last previous edition approved in 2012 as D7056 – 07 (2012).
DOI: 10.1520/D7056-07R18.
quality assurance and quality control purposes, it is also
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
intended to provide the quality assurance engineer with suffi-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
cient seam shear data to evaluate seam quality. Recording and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. reporting data will allow the quality assurance engineer to take
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7056 − 07 (2018)
measures necessary to ensure the repair of seams with unac-
ceptable strength during facility construction, and therefore,
minimize the potential for seam separation in service.
5. Apparatus
5.1 Tensile instrumentation shall meet the requirements
outlined in Test Method D638.
5.2 Grip Faces—Grip faces shall be a minimum of 50 mm
(2 in.) wide and a minimum of 50 mm (2 in.) in length. Smooth
rubber, fine serrated, or coarse serrated grip faces have all been
found to be suitable for testing PBGMs. If needed, the use of
a silicone-coated paper to help holding the PBGM specimen
ends into the grips is recommended The silicone-coated side is
to be used in contact with the PBGM specimen (see Fig. 1).
6. Sample and Specimen Preparation
FIG. 2 Shear Testing
6.1 Seam Samples—Cut a portio
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