ASTM D8172/D8172M-18(2023)e1 PDF

Overview

ASTM D8172/D8172M-18(2023)e1 is an international standard developed by ASTM International under the jurisdiction of ASTM Committee D35 on Geosynthetics. This standard details a test method for evaluating the shear and peel strength of solvent-welded, nonreinforced geomembrane seams made by adhesive and chemical fusion processes. As nonreinforced geomembranes are widely used as barrier materials in environmental and civil engineering applications, this standard provides essential procedures for ensuring seam integrity through destructive testing, supporting robust quality control and assurance practices.

Key Topics

• Destructive Testing Methods: The standard specifies destructive seam tests to determine seam integrity for seams produced by adhesive and chemical fusion (excluding thermal fusion).
• Sampling and Specimen Preparation: Two sampling methods are outlined:
  • Method A: For seams without a testing flap.
  • Method B: For seams with a testing flap.
• Applicable Materials: It is primarily intended for polyvinyl chloride (PVC)-based geomembranes but is applicable to other nonreinforced geomembranes.
• Testing Procedures:
  • Peel Strength: Testing the resistance to separation of seam layers.
  • Shear Strength: Testing the resistance to sliding along the seam.
• Conditioning and Test Environment: Procedures require curing and standard laboratory conditioning to ensure consistency.
• Results and Reporting: Guidelines on reporting are provided, including required documentation such as sample identification, fabrication details, and test conditions.
• Safety and Units: Emphasis is placed on compliance with safety data sheets and the use of either SI or inch-pound units exclusively.

Applications

The ASTM D8172/D8172M-18(2023)e1 standard is crucial for industries relying on geomembrane barriers to prevent contamination, leakage, or fluid migration. Key practical applications include:

• Landfill Liners and Caps: Ensuring the integrity of seams in geomembranes used as landfill liners or covers to prevent leachate escape and environmental contamination.
• Reservoirs and Pond Liners: Verifying seam strength in water containment systems to support water leakage resistance and durability.
• Wastewater and Water Treatment Facilities: Assessing the quality of geomembrane installations in engineered ponds and tanks.
• Secondary Containment: Used in systems for chemical or fuel storage to maintain barrier reliability.
• General Civil and Environmental Engineering: Quality control in various infrastructure and environmental projects where nonreinforced geomembranes are used for containment.

By applying this test method, organizations can validate seam quality, improve installation procedures, and help ensure the long-term performance and safety of geomembrane systems.

Related Standards

Several ASTM standards and terminology documents are referenced in ASTM D8172/D8172M-18(2023)e1, underlining its integration within a broader framework for geosynthetics testing and specification:

• ASTM D4439: Standard Terminology for Geosynthetics
• ASTM D76/D76M: Specification for Tensile Testing Machines for Textiles

These related documents ensure consistent definitions and testing apparatus requirements across geosynthetics standards. Users are encouraged to consult these documents for comprehensive testing and terminology guidelines in geomembrane quality control.

Keywords: ASTM D8172, shear strength, peel strength, geomembrane seams, nonreinforced geomembranes, chemical fusion, adhesive seams, PVC geomembranes, landfill liners, pond liners, geosynthetics testing, quality control, water containment membranes, seam integrity.