Standard Guide for Selection of Test Methods to Determine Rate of Fluid Permeation Through Geomembranes for Specific Applications

SIGNIFICANCE AND USE
The principal characteristic of geomembranes is their intrinsically low permeability to a broad range of gases, vapors, and liquids, both as single-component fluids and as complex mixtures of many constituents. As low permeable materials, geomembranes are being used in a wide range of engineering applications in geotechnical, environmental, and transportation areas as barriers to control the migration of mobile fluids and their constituents. The range of potential permeants is broad and the service conditions can differ greatly. This guide shows users test methods available for determining the permeability of geomembranes to various permeants.
The transmission of various species through a geomembrane is subject to many factors that must be assessed in order to be able to predict its effectiveness for a specific service. Permeability measurements are affected by test conditions, and measurements made by one method cannot be translated from one application to another. A wide variety of permeability tests have been devised to measure the permeability of polymeric materials; however, only a limited number of these procedures have been applied to geomembranes. Test conditions and procedures should be selected to reflect actual service requirements as closely as possible. It should be noted that field conditions may be difficult to model or maintain in the laboratory. This may impact apparent performance of geomembrane samples.
This guide discusses the mechanism of permeation of mobile chemical species through geomembranes and the permeability tests that are relevant to various types of applications and permeating species. Specific tests for the permeability of geomembranes to both single-component fluids and multicomponent fluids that contain a variety of permeants are described and discussed.
SCOPE
1.1 This guide covers selecting one or more appropriate test methods to assess the permeability of all candidate geomembranes for a proposed specific application to various permeants. The widely different uses of geomembranes as barriers to the transport and migration of different gases, vapors, and liquids under different service conditions require determinations of permeability by test methods that relate to and simulate the service. Geomembranes are nonporous homogeneous materials that are permeable in varying degrees to gases, vapors, and liquids on a molecular scale in a three-step process (1) by dissolution in or absorption by the geomembrane on the upstream side, (2) diffusion through the geomembrane, and (3) desorption on the downstream side of the barrier.
1.2 The rate of transmission of a given chemical species, whether as a single permeant or in mixtures, is driven by its chemical potential or in practical terms by its concentration gradient across the geomembrane. Various methods to assess the permeability of geomembranes to single component permeants, such as individual gases, vapors, and liquids are referenced and briefly described.
1.3 Various test methods for the measurement of permeation and transmission through geomembranes of individual species in complex mixtures such as waste liquids are discussed.
1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-May-2011
Technical Committee
Drafting Committee
Current Stage
Ref Project

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ASTM D5886-95(2011) - Standard Guide for Selection of Test Methods to Determine Rate of Fluid Permeation Through Geomembranes for Specific Applications
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D5886 −95 (Reapproved 2011)
Standard Guide for
Selection of Test Methods to Determine Rate of Fluid
Permeation Through Geomembranes for Specific
1
Applications
This standard is issued under the fixed designation D5886; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
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1.1 Thisguidecoversselectingoneormoreappropriatetest 2.1 ASTM Standards:
methods to assess the permeability of all candidate geomem- D471Test Method for Rubber Property—Effect of Liquids
branes for a proposed specific application to various per- D814Test Method for Rubber Property—Vapor Transmis-
meants.Thewidelydifferentusesofgeomembranesasbarriers sion of Volatile Liquids
to the transport and migration of different gases, vapors, and D815Test Method for Testing Coated Fabrics Hydrogen
3
liquids under different service conditions require determina- Permeance (Withdrawn 1987)
tionsofpermeabilitybytestmethodsthatrelatetoandsimulate D1434TestMethodforDeterminingGasPermeabilityChar-
the service. Geomembranes are nonporous homogeneous ma- acteristics of Plastic Film and Sheeting
terials that are permeable in varying degrees to gases, vapors, D4439Terminology for Geosynthetics
and liquids on a molecular scale in a three-step process (1)by D4491Test Methods for Water Permeability of Geotextiles
dissolution in or absorption by the geomembrane on the by Permittivity
upstream side, (2) diffusion through the geomembrane, and (3) E96/E96MTest Methods for Water Vapor Transmission of
desorption on the downstream side of the barrier. Materials
F372Test Method for Water Vapor Transmission Rate of
1.2 The rate of transmission of a given chemical species,
Flexible Barrier Materials Using an Infrared Detection
whether as a single permeant or in mixtures, is driven by its
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Technique (Withdrawn 2009)
chemical potential or in practical terms by its concentration
F739Test Method for Permeation of Liquids and Gases
gradient across the geomembrane. Various methods to assess
throughProtectiveClothingMaterialsunderConditionsof
the permeability of geomembranes to single component
Continuous Contact
permeants, such as individual gases, vapors, and liquids are
referenced and briefly described.
3. Terminology
1.3 Varioustestmethodsforthemeasurementofpermeation
3.1 Definitions:
and transmission through geomembranes of individual species
3.1.1 downstream, n—the space adjacent to the geomem-
in complex mixtures such as waste liquids are discussed.
brane through which the permeant is flowing.
1.4 This standard does not purport to address all of the
3.1.2 geomembrane,n—anessentiallyimpermeablegeosyn-
safety concerns, if any, associated with its use. It is the
thetic composed of one or more synthetic sheets. (See Termi-
responsibility of the user of this standard to establish appro-
nology D4439.)
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This guide is under the jurisdiction ofASTM Committee D35 on Geosynthet- contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
icsand is the direct responsibility of Subcommittee D35.10 on Geomembranes. Standards volume information, refer to the standard’s Document Summary page on
CurrenteditionapprovedJune1,2011.PublishedJuly2011.Originallyapproved the ASTM website.
3
in 1995. Last previous edition approved in 2006 as D5886–95 (2006). DOI: The last approved version of this historical standard is referenced on
10.1520/D5886-95R11. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D5886−95 (2011)
3.1.2.1 Discussion—In geotechnical engineering, essen- species through geomembranes without holes proceeds by
tially impermeable means that no measurable liquid flows absorption of the species in the geomembrane and diffusion
through a geosynthetic when tested in accordance with Test through the geomembrane on a molecular basis. The driving
Methods D4491. force is chemical potential across the geomembrane. A liquid
permeates porous materials in a condensed state that can carry
3.1.3 geosynthetic, n—a planar product manufactured from
the dissolved constituents, and the driving force for such
polymeric material used with soil, rock, earth, or other geo-
permeationishydraulicpressure.Duetotheselectivenatureof
technical engineering-related material as an integral part of a
geomembranes,thepermeationofthedissolvedc
...

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