ASTM D6525-00

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Designation:D6525–00
Standard Test Method for
Measuring Nominal Thickness of Permanent Rolled Erosion
Control Products
This standard is issued under the fixed designation D 6525; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope distance that a movable plane is displaced from a parallel
surface by the permanent rolled erosion control product while
1.1 This test method is used to measure the nominal
under a specified pressure of 0.2 kPa (0.029 psi) for 5 s.
thickness of permanent rolled erosion control products.
1.2 The values stated in SI units are to be considered as the
5. Significance and Use
standard. The values are provided in inch-pound units for
5.1 Thickness is one of the basic physical properties used to
information only.
control the quality of permanent rolled erosion control prod-
1.3 This test method does not provide thickness values for
ucts. Thickness values may aid in the calculation of other
permanent rolled erosion control products under variable
permanent rolled erosion control product parameters. Thick-
compressive stresses. This test method determines nominal
ness however is not generally an indication of field perfor-
thickness, not necessarily minimum thickness.
mance and generally should not be used in specifications. This
1.4 This standard does not purport to address all of the
test method is developed to aid manufacturers, designers, and
safety concerns, if any, associated with its use. It is the
end users in comparing the thickness of permanent rolled
responsibility of the user of this standard to establish appro-
erosion control products through the use of an acceptedASTM
priate safety and health practices and determine the applica-
standard.
bility of regulatory limitations prior to use.
5.2 The thickness of permanent rolled erosion control prod-
2. Referenced Documents ucts may vary considerably depending on the pressure applied
to the specimen during measurement.Where observed changes
2.1 ASTM Standards:
occur, thickness decreases when applied pressure is increased.
D 1777 Test Method for Thickness of Textile Materials
To minimize variation, specific sample size and applied pres-
D 4354 Practice for Sampling of Geosynthetics for Testing
sure are indicated in this test method to ensure all results are
D 4439 Terminology for Geotextiles
comparable.
D 5199 Test Method for Measuring Nominal Thickness of
5.3 This test method may be used for acceptance testing of
Geotextiles and Geomembranes
commercial shipments of permanent rolled erosion control
3. Terminology
products, but caution is advised since information on between-
laboratory precision is incomplete. Comparative tests in accor-
3.1 Definitions:
dance with 5.3.1 may be advised.
3.1.1 pressure, n—the force or load per unit area.
5.3.1 In case of a dispute arising from differences in
3.1.2 thickness—(1) the distance between one planar sur-
reported test results when using this test method for acceptance
face and its opposite parallel and planar surface; (2) in
testing of commercial shipments, the purchaser and the sup-
permanent rolled erosion control products, the distance be-
plier should conduct comparative tests to determine if there is
tween the upper and lower surfaces of the material, measured
a statistical bias between their laboratories. Competent statis-
under a specified pressure and time.
tical assistance is recommended for the investigation of bias.
4. Summary of Test Method
As a minimum, the two parties should take a group of test
specimens that are as homogeneous as possible and that are
4.1 The nominal thickness of permanent rolled erosion
formed from a lot of material of the type in question. The test
control products is determined by observing the perpendicular
specimens should be randomly assigned in equal numbers to
each laboratory for testing. The average results from the two
This test method is under the jurisdiction of ASTM Committee D-35 on
laboratories should be compared using Students t-test for
Geosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-
unpaireddataandanacceptableprobabilitylevelchosenbythe
thetic Erosion Control.
two parties before the testing is begun. If bias is found, either
Current edition approved Feb 10, 2000. Published April 2000.
Annual Book of ASTM Standards, Vol 07.01.
Annual Book of ASTM Standards, Vol 04.13.
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D6525–00
its cause must be found and corrected or the purchaser and 7.2 Laboratory Sample—Consider the units in the lot
supplier must agree to interpret future tests in light of the sample as the units in the laboratory sample. For the laboratory
known bias.
sample, take a full-width sample of sufficient length along the
centersectionoftherolls.Excludetheinnerandouterlayersor
NOTE 1—The user should be aware that the compressibility of the
wraps of the roll or any material containing folds, crushed
materials, their rebound characteristics, and the like will also affect the
thickness of the permanent rolled erosion control products following the areas, or other distortions not representative of the sampled lot.
time they are rolled up on rolls, shipped, and stored.
7.3 Remove test specimens from the laboratory sample in a
randomlydistributedpatternacrossthewidthwithnospecimen
6. Apparatus
taken nearer than 100 mm (4 in.) from the roll sides or ends,
6.1 Thickness Testing Instrument—The thickness gage shall
unless otherwise specified.
have a base (or anvil) and a free-moving presser foot plate
7.4 T
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