ASTM D6525-12

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Designation: D6525 − 12
StandardTest Method for
Measuring Nominal Thickness of Rolled Erosion Control
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Products
This standard is issued under the fixed designation D6525; 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 4. Summary of Test Method
4.1 The nominal thickness of permanent rolled erosion
1.1 Thistestmethodcoversthemeasurementofthenominal
thickness of permanent rolled erosion control products. control products is determined by observing the perpendicular
distance that a movable plane is displaced from a parallel
1.2 This test method does not provide thickness values for
surface by the permanent rolled erosion control product while
permanent rolled erosion control products under variable
under a specified pressure of 0.2 kPa (0.029 psi) for 5 s.
compressive stresses. This test method determines nominal
thickness, not necessarily minimum thickness.
5. Significance and Use
1.3 The values stated in SI units are to be regarded as
5.1 Thickness is one of the basic physical properties used to
standard. The values given in parentheses are for information
control the quality of permanent rolled erosion control prod-
only.
ucts. Thickness values may aid in the calculation of other
permanent rolled erosion control product parameters. Thick-
1.4 This standard does not purport to address all of the
ness however is not generally an indication of field perfor-
safety concerns, if any, associated with its use. It is the
mance and generally should not be used in specifications. This
responsibility of the user of this standard to establish appro-
test method is developed to aid manufacturers, designers, and
priate safety and health practices and determine the applica-
end users in comparing the thickness of permanent rolled
bility of regulatory limitations prior to use.
erosion control products through the use of an acceptedASTM
standard.
2. Referenced Documents
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5.2 The thickness of permanent rolled erosion control prod-
2.1 ASTM Standards:
ucts may vary considerably depending on the pressure applied
D4354 Practice for Sampling of Geosynthetics for Testing
to the specimen during measurement.Where observed changes
D5199 Test Method for Measuring the Nominal Thickness
occur, thickness decreases when applied pressure is increased.
of Geosynthetics
To minimize variation, specific sample size and applied pres-
sure are indicated in this test method to ensure all results are
3. Terminology
comparable.
3.1 Definitions:
5.3 This test method may be used for acceptance testing of
3.1.1 pressure, n—the force or load per unit area.
commercial shipments of permanent rolled erosion control
3.1.2 thickness—(1)thedistancebetweenoneplanarsurface
products, but caution is advised since information on between-
and its opposite parallel and planar surface; (2) in permanent
laboratory precision is incomplete. Comparative tests in accor-
rolled erosion control products, the distance between the upper
dance with 5.3.1 may be advised.
and lower surfaces of the material, measured under a specified
5.3.1 In case of a dispute arising from differences in
pressure and time.
reported test results when using this test method for acceptance
testing of commercial shipments, the purchaser and the sup-
plier should conduct comparative tests to determine if there is
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This test method is under the jurisdiction of ASTM Committee D35 on
a statistical bias between their laboratories. Competent statis-
Geosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-
tical assistance is recommended for the investigation of bias.
thetic Erosion Control.
As a minimum, the two parties should take a group of test
Current edition approved July 1, 2012. Published September 2012. Originally
specimens that are as homogeneous as possible and that are
approved in 2000. Last previous edition approved in 2006 as D6525 – 00R06. DOI:
10.1520/D6525-12.
formed from a lot of material of the type in question. The test
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
specimens should be randomly assigned in equal numbers to
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
each laboratory for testing. The average results from the two
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. laboratories should be compared using Students t-test for
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D6525 − 12
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