ASTM D7466-10
(Test Method)Standard Test Method for Measuring the Asperity Height of Textured Geomembrane
Standard Test Method for Measuring the Asperity Height of Textured Geomembrane
SIGNIFICANCE AND USE
The asperity height is an index property used to quantify one of the physical attributes related to the surface roughness of textured geomembranes.
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 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.
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Designation: D7466 − 10
StandardTest Method for
1
Measuring Asperity Height of Textured Geomembranes
This standard is issued under the fixed designation D7466; 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 3.2.2 core thickness, n—the average thickness of a textured
geomembrane as measured using Test Method D5994.
1.1 This test method covers a procedure to measure the
3.2.3 geomembrane, n—anessentiallyimpermeablegeosyn-
asperity height of textured geomembranes.
thetic composed of one or more synthetic sheets. D4439
1.2 This test method does not provide for measurement of
3.2.4 setting block, n—the component part of a depth gauge
the spacing between the asperities nor of the complete profile
that rests on top of the asperities.
of the textured surface.
3.2.5 thickness, n— the perpendicular distance between one
1.3 This standard does not purport to address all of the
surface and its opposite.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.2.6 thickness gauge contact point, n—the tip of a thick-
priate safety and health practices and determine the applica-
ness gauge which contacts the base sheet of the geomembrane
bility of regulatory limitations prior to use.
surface.
4. Summary of Test Method
2. Referenced Documents
2
4.1 The asperity height of a textured geomembrane is
2.1 ASTM Standards:
measured with a depth gauge, the setting block of which rests
D4439 Terminology for Geosynthetics
on the top of the asperities while the contact point extends to
D5994 Test Method for Measuring Core Thickness of Tex-
the sheet’s core surface.
tured Geomembranes
E177 Practice for Use of the Terms Precision and Bias in
4.2 The asperity height of a textured geomembrane is
ASTM Test Methods
calculated as the average value of ten (10) individual measure-
E691 Practice for Conducting an Interlaboratory Study to
ments taken across the roll width of the sample under investi-
Determine the Precision of a Test Method
gation.
E2554 Practice for Estimating and Monitoring the Uncer-
tainty of Test Results of a Test Method Using Control
5. Significance and Use
Chart Techniques
5.1 The asperity height is an index property used to quantify
one of the physical attributes related to the surface roughness
3. Terminology
of textured geomembranes.
3.1 For definitions of other terms used in this test method,
5.2 This test method is applicable to all currently available
refer to Terminology D4439.
textured geomembranes that are deployed as manufactured
3.2 Definitions:
geomembrane sheets.
3.2.1 asperity, n—the individual projections of polyethylene
that extend above the core surface of a textured geomembrane 6. Apparatus
resulting in the textured surface profile.
6.1 Depth Gauge—The depth gauge shall consist of three
components that conform the requirements of this section; a
dial indicator, a setting block and a contact point with exten-
1
This test method is under the jurisdiction of ASTM Committee D35 on
sion.
GeosyntheticsandisthedirectresponsibilityofSubcommitteeD35.10onGeomem-
6.1.1 Dial Indicator—capable of measuring to depth of at
branes.
least 2.5 mm (0.10 in.) with an accuracy of 60.025 mm
Current edition approved July 1, 2010. Published September 2010. Originally
(0.001 in.).
approved in 2008. Last previous edition approved in 2008 as D7466-08. DOI:
10.1520/D7466-10.
6.1.2 Setting Block—the setting block shall have a base
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
dimension of 50 mm to 63.5 mm long by 20 mm to 12.7 mm
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
wide (2.0 in. to 2.5 in long by 0.75 in. to 0.50 in wide) and a
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. height of 15 mm (0.60 in.)
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7466 − 10
FIG. 3 Contact Extension
8. Conditioning and Testing
8.1 Bring the specimens to temperature equilibrium at 21 6
2°C (70 6 4°F) and at a relative humidity of 60 6 10 %.
9. Procedure
FIG. 1 Asperity Height Test Gauge
9.1 Test the conditioned specimens in the standard labora-
tory atmosphere specified in 8.1.
6.1.3 Contact Point with Extension—The contact point is
9.2 Place the depth gauge on a flat, rigid supporting surface
1.3 mm (0.051 in.) in diameter with the tip tapered to a point.
to zero the contact point with the bottom of the setting block.
An extensio
...
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.
Designation:D7466–08 Designation:D7466–10
Standard Test Method for
1
Measuring the Asperity Height of Textured Geomembranes
This standard is issued under the fixed designation D7466; 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
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 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D4439 Terminology for Geosynthetics
D5994 Test Method for Measuring Core Thickness of Textured Geomembrane Test Method for Measuring Core Thickness of
Textured Geomembrane
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 in a Single Laboratory Using
a Control Sample Program
3. Terminology
3.1
3.1 For definitions of other terms used in this test method, refer to Terminology D4439.
3.2 Definitions:
3.1.1
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.
3.1.2core thickness,
3.2.2 core thickness, n—the average thickness of a textured geomembrane as measured using Test Method D5994.
3.1.3geomembrane)
3.2.3 geomembrane, n—an essentially impermeable geosynthetic composed of one or more synthetic sheets. D4439
3.1.4thickness gage contact point, n—the tip of a thickness gage which contacts the base sheet of the geomembrane surface.
3.1.5 D4439
3.2.4 setting block, n—the component part of a depth gauge that rests on top of the asperities.
3.1.63.2.5 thickness, n— the perpendicular distance between one surface and its opposite.
3.2For definitions of other terms used in this test method, refer to Terminology D4439.
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
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 July 1, 2008. Published August 2008. DOI: 10.1520/D7466-08.
Current edition approved July 1, 2010. Published September 2010. Originally approved in 2008. Last previous edition approved in 2008 as D7466-08. DOI:
10.1520/D7466-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. 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 ----------------------
D7466–10
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 geomembranes.
5.2 This test method is applicable to all currently available textured geomembranes that are deployed as manufactured
geomembrane sheets.
6. Apparatus
6.1 Depth Gauge— The —The depth gauge shall consist of three components that conform the requirements of this section;
a dial indicator, a setting block and a contact point with extension.
6.1.1 Dial Indicator—capable—capable of measuring to depth of at least 2.5 mm (0.10 in.) with an accuracy of 60.025 mm
(0.001 in.).
6.1.2 Settin
...
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