ASTM D7749-11(2018)
Standard Test Method for Determining Integrity of Seams Produced Using Thermo-Fusion Methods for Reinforced Geomembranes by the Grab Method

Standard No.

ASTM D7749-11(2018)

Release Date

2018

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D7749/D7749M-11(2023)e1

Latest

ASTM D7749/D7749M-11(2023)e1

Scope

1.1 This test method describes destructive quality control tests used to determine the integrity of thermo-fusion seams made with reinforced geomembranes. A test procedure is described that uses seam tests using grab specimens for seam shear strength. 1.2 The types of thermal field and factory seaming techniques used to construct geomembrane seams include the following: 1.2.1 Hot Air—This technique introduces high-temperature air between two geomembrane surfaces to facilitate melting. Pressure is applied to the top or bottom geomembrane, forcing together the two surfaces to form a continuous bond. 1.2.2 Hot Wedge—This technique melts the two geomembrane surfaces to be seamed by running a hot metal wedge between them. Pressure is applied to the top and bottom geomembrane to form a continuous bond. Some seams of this kind are made with dual tracks separated by a non-bonded gap. These seams are sometimes referred to as dual hot wedge seams or double-track seams. 1.2.3 Extrusion—This technique encompasses extruding molten resin between two geomembranes or at the edge of two overlapped geomembranes to effect a continuous bond. 1.2.4 Radio Frequency (RF) or Dielectric—High-frequency dielectric equipment is used to generate heat and pressure to form an overlap seam in factory fabrication. 1.2.5 Impulse—Clamping bars heated by wires or a ribbon melt the sheets clamped between them. A cooling period while still clamped allows the polymer to solidify before being released. 1.3 The types of materials covered by this test method include, but are not limited to, reinforced geomembranes made from the following polymers: 1.3.1 Very low-density polyethylene (VLDPE). 1.3.2 Linear low-density polyethylene (LLDPE). 1.3.3 Flexible polypropylene (fPP). 1.3.4 Polyvinyl chloride (PVC). 1.3.5 Chlorosulfonated polyethylene (CSPE). 1.3.6 Ethylene interpolymer alloy (EIA). 1.4 Units—The values stated in either SI units or inchpound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 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.

ASTM D7749-11(2018) Referenced Document

• ASTM D4439 Standard Terminology for Geosynthetics*， 2024-02-01 Update
• ASTM D7003/D7003M Standard Test Method for Strip Tensile Properties of Reinforced Geomembranes*， 2024-04-21 Update
• ASTM D7004/D7004M Standard Test Method for Grab Tensile Properties of Reinforced Geomembranes*， 2021-07-01 Update
• ASTM D76/D76M Standard Specification for Tensile Testing Machines for Textiles*， 2021-07-01 Update
• ASTM D7747/D7747M Standard Test Method for Determining Integrity of Seams Produced Using Thermo-Fusion Methods for Reinforced Geomembranes by the Strip Tensile Method*， 2024-04-21 Update

ASTM D7749-11(2018) history

• 2018 ASTM D7749/D7749M-11(2023)e1 Standard Test Method for Determining Integrity of Seams Produced Using Thermo-Fusion Methods for Reinforced Geomembranes by the Grab Method
• 2018 ASTM D7749-11(2018) Standard Test Method for Determining Integrity of Seams Produced Using Thermo-Fusion Methods for Reinforced Geomembranes by the Grab Method
• 2011 ASTM D7749-11 Standard Test Method for Determining Integrity of Seams Produced Using Thermo-Fusion Methods for Reinforced Geomembranes by the Grab Method