ASTM D7466/D7466M-23

Standard Test Method for Measuring Asperity Height of Textured Geomembranes

SIGNIFICANCE AND USE
5.1 The asperity height is an index property used to quantify one of the physical attributes related to the surface roughness of textured geomembranes.  
5.2 This test method is applicable to all currently available textured geomembranes that are deployed as manufactured geomembrane sheets.
SCOPE
1.1 This test method covers a procedure to measure the asperity height of textured geomembranes.  
1.2 This test method does not provide for measurement of the spacing between the asperities nor of the complete profile of the textured surface.  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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.

General Information

• Status: Published
• Publication Date: 31-Oct-2023
• ICS: 59.080.70 - Geotextiles
• Technical Committee: D35 - Geosynthetics
• Drafting Committee: D35.10 - Geomembranes

Relations

• Replaces: ASTM D7466/D7466M-10(2015)e1 - Standard Test Method for Measuring Asperity Height of Textured Geomembranes
• Effective Date: 01-Nov-2023
• Referred By: ASTM D6243/D6243M-20 - Standard Test Method for Determining the Internal and Interface Shear Strength of Geosynthetic Clay Liner by the Direct Shear Method
• Effective Date: 01-Nov-2023

Standards Content (Sample)

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: D7466/D7466M − 23
Standard Test Method for
1
Measuring Asperity Height of Textured Geomembranes
This standard is issued under the fixed designation D7466/D7466M; 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 E2554 Practice for Estimating and Monitoring the Uncer-
tainty of Test Results of a Test Method Using Control
1.1 This test method covers a procedure to measure the
Chart Techniques
asperity height of textured geomembranes.
1.2 This test method does not provide for measurement of
3. Terminology
the spacing between the asperities nor of the complete profile
3.1 For definitions of other terms used in this test method,
of the textured surface.
refer to Terminology D4439.
1.3 The values stated in either SI units or inch-pound units
3.2 Definitions:
are to be regarded separately as standard. The values stated in
3.2.1 asperity, n—the individual projections of polyethylene
each system are not necessarily exact equivalents; therefore, to
that extend above the core surface of a textured geomembrane
ensure conformance with the standard, each system shall be
resulting in the textured surface profile.
used independently of the other, and values from the two
3.2.2 core thickness, n—the average thickness of a textured
systems shall not be combined.
geomembrane as measured using Test Method D5994/
1.4 This standard does not purport to address all of the
D5994M.
safety concerns, if any, associated with its use. It is the
3.2.3 geomembrane, n—an essentially impermeable geosyn-
responsibility of the user of this standard to establish appro-
thetic composed of one or more synthetic sheets. D4439
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3.2.4 setting block, n—the component part of a depth gauge
1.5 This international standard was developed in accor-
that rests on top of the asperities.
dance with internationally recognized principles on standard-
3.2.5 thickness, n— the perpendicular distance between one
ization established in the Decision on Principles for the
surface and its opposite.
Development of International Standards, Guides and Recom-
3.2.6 thickness gauge contact point, n—the tip of a thick-
mendations issued by the World Trade Organization Technical
ness gauge which contacts the base sheet of the geomembrane
Barriers to Trade (TBT) Committee.
surface.
2. Referenced Documents
4. Summary of Test Method
2
2.1 ASTM Standards:
4.1 The asperity height of a textured geomembrane is
D4439 Terminology for Geosynthetics
measured with a depth gauge, the setting block of which rests
D5994/D5994M Test Method for Measuring Core Thickness
on the top of the asperities while the contact point extends to
of Textured Geomembranes
the sheet’s core surface.
E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
4.2 The asperity height of a textured geomembrane is
E691 Practice for Conducting an Interlaboratory Study to
calculated as the average value of ten (10) individual measure-
Determine the Precision of a Test Method
ments taken across the roll width of the sample under investi-
gation.
1
This test method is under the jurisdiction of ASTM Committee D35 on
5. Significance and Use
Geosynthetics and is the direct responsibility of Subcommittee D35.10 on Geomem-
branes.
5.1 The asperity height is an index property used to quantify
Current edition approved Nov. 1, 2023. Published December 2023. Originally
one of the physical attributes related to the surface roughness
approved in 2008. Last previous edition approved in 2015 as D7466/D7466M – 10
ɛ1
of textured geomembranes.
(2015) . DOI: 10.1520/D7466_D7466M-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2 This test method is applicable to all currently available
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
textured geomembranes that are deployed as manufactured
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. geomembrane sheets.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D7466/D7466M − 23
6. Apparatus
6.1 Depth Gauge—The depth gauge shall consist of three
components that conform the requirements of this section: a
digital or dial indicator, a setting block, an
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: D7466/D7466M − 10 (Reapproved 2015) D7466/D7466M − 23
Standard Test Method for
1
Measuring Asperity Height of Textured Geomembranes
This standard is issued under the fixed designation D7466/D7466M; 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
ε NOTE—Designation was changed to dual and units information was corrected editorially in June 2015.
1. Scope
1.1 This test method covers a procedure to measure the asperity height of textured geomembranes.
1.2 This test method does not provide for measurement of the spacing between the asperities nor of the complete profile of the
textured surface.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D4439 Terminology for Geosynthetics
D5994/D5994M Test Method for Measuring Core Thickness of Textured Geomembranes
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E2554 Practice for Estimating and Monitoring the Uncertainty of Test Results of a Test Method Using Control Chart Techniques
3. Terminology
3.1 For definitions of other terms used in this test method, refer to Terminology D4439.
3.2 Definitions:
1
This test method is under the jurisdiction of ASTM Committee D35 on Geosynthetics and is the direct responsibility of Subcommittee D35.10 on Geomembranes.
Current edition approved May 1, 2015Nov. 1, 2023. Published June 2015December 2023. Originally approved in 2008. Last previous edition approved in 20102015 as
ɛ1
D7466/D7466M – 10 (2015) D7466-10. DOI: 10.1520/D7466_D7466M-10R15E01. DOI: 10.1520/D7466_D7466M-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7466/D7466M − 23
3.2.1 asperity, n—the individual projections of polyethylene that extend above the core surface of a textured geomembrane
resulting in the textured surface profile.
3.2.2 core thickness, n—the average thickness of a textured geomembrane as measured using Test Method D5994/D5994M.
3.2.3 geomembrane, n—an essentially impermeable geosynthetic composed of one or more synthetic sheets. D4439
3.2.4 setting block, n—the component part of a depth gauge that rests on top of the asperities.
3.2.5 thickness, n— the perpendicular distance between one surface and its opposite.
3.2.6 thickness gauge contact point, n—the tip of a thickness gauge which contacts the base sheet of the geomembrane surface.
4. Summary of Test Method
4.1 The asperity height of a textured geomembrane is measured with a depth gauge, the setting block of which rests on the top
of the asperities while the contact point extends to the sheet’s core surface.
4.2 The asperity height of a textured geomembrane is calculated as the average value of ten (10) individual measurements taken
across the roll width of the sample under investigation.
5. Significance and Use
5.1 The asperity height is an index property used to quantify one of the physical attributes related to the surface roughness of
textured
...