ASTM D6525/D6525M-18(2023)

Standard Test Method for Measuring Nominal Thickness of Rolled Erosion Control Products

SIGNIFICANCE AND USE
5.1 Thickness is one of the basic physical properties used to control the quality of rolled erosion control products. Thickness values may aid in the calculation of other rolled erosion control product parameters. Thickness, however, is not generally an indication of field performance and generally should not be used in specifications. This test method is developed to aid manufacturers, designers, and end users in comparing the thickness of rolled erosion control products through the use of an accepted ASTM standard.  
5.2 The thickness of rolled erosion control products may vary considerably depending on the pressure applied to the specimen during measurement. Where observed changes occur, thickness decreases when applied pressure is increased. To minimize variation, specific sample size and applied pressure are indicated in this test method to ensure all results are comparable.  
5.3 This test method may be used for acceptance testing of commercial shipments of rolled erosion control products, but caution is advised since information on between-laboratory precision is incomplete. Comparative tests in accordance with 5.3.1 may be advised.  
5.3.1 In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. At a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are formed from a lot of material of the type in question. The test specimens should be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student’s t-test for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun. If b...
SCOPE
1.1 This test method covers the measurement of the nominal thickness of rolled erosion control products.  
1.2 This test method does not provide thickness values for rolled erosion control products under variable compressive stresses. This test method determines nominal thickness, not necessarily minimum thickness.  
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: 30-Apr-2023
• ICS: 91.100.99 - Other construction materials
• Technical Committee: D35 - Geosynthetics
• Drafting Committee: D35.05 - Geosynthetic Erosion Control

Relations

• Refers: ASTM D4354-12(2020) - Standard Practice for Sampling of Geosynthetics and Rolled Erosion Control Products (RECPs) for Testing
• Effective Date: 01-May-2020
• Refers: ASTM E177-14 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-May-2014
• Refers: ASTM E691-13 - Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• Effective Date: 01-May-2013
• Refers: ASTM E177-13 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-May-2013
• Refers: ASTM D4354-12 - Standard Practice for Sampling of Geosynthetics and Rolled Erosion Control Products(RECPs) for Testing
• Effective Date: 01-Jul-2012
• Refers: ASTM E691-11 - Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• Effective Date: 01-Nov-2011
• Refers: ASTM E177-10 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-Oct-2010
• Refers: ASTM D4354-99(2009) - Standard Practice for Sampling of Geosynthetics for Testing
• Effective Date: 15-Jan-2009
• Refers: ASTM E691-08 - Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• Effective Date: 01-Oct-2008
• Refers: ASTM E177-08 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-Oct-2008
• Refers: ASTM E177-06b - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 15-Nov-2006
• Refers: ASTM E177-06a - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-Nov-2006
• Refers: ASTM E691-05 - Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• Effective Date: 01-Nov-2005
• Refers: ASTM E177-04 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-Nov-2004
• Refers: ASTM E177-06 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-Nov-2004

Overview

ASTM D6525/D6525M-18(2023), titled “Standard Test Method for Measuring Nominal Thickness of Rolled Erosion Control Products,” is an internationally recognized standard developed by ASTM International. The test method defines a precise procedure for measuring the nominal thickness of rolled erosion control products (RECPs), which ensures reliable and consistent quality control in the manufacturing and specification of these products. This standard is widely referenced in industries where geosynthetics and erosion control materials are produced, tested, and utilized in environmental and civil engineering projects.

Thickness is one of the fundamental physical properties used to assess and compare different types of rolled erosion control products. The test method emphasizes that while nominal thickness can serve in quality control and product parameter calculations, it is not generally an indicator of field performance or suitability for specifications.

Key Topics

• Measurement Scope: ASTM D6525/D6525M exclusively addresses the measurement of nominal thickness of RECPs under a specified compressive pressure and conditioning environment. Measurements taken under variable pressures or different environmental conditions may vary and are not covered by this standard.
• Standardized Testing Conditions: The method specifies sample preparation, conditioning, and the use of a defined pressure (0.2 kPa) for a specified time interval during measurement, ensuring accurate and comparable results across different products and laboratories.
• Quality Control: Thickness measurement is a core quality control parameter for RECPs. This standard enables manufacturers, designers, and end users to evaluate and compare products using consistent criteria.
• Statistical Considerations: The standard details procedures for resolving discrepancies between laboratories, including guidance for statistical comparison using Student's t-test to identify bias and ensure reliability of inter-laboratory results.
• Unit Systems: Results may be reported in SI or inch-pound units, but systems must not be mixed to maintain accuracy.
• Safety and Compliance: Users are responsible for adhering to safety, health, and environmental requirements, and for meeting applicable regulatory limitations.

Applications

• Manufacturing and Quality Assurance: Producers of rolled erosion control products use this standard to monitor batch-to-batch consistency, verify compliance with customer or regulatory requirements, and provide product quality documentation.
• Product Comparison: Designers and engineers use thickness data when evaluating alternative RECPs for specific projects, allowing for informed comparison based on a standardized property.
• Commercial Acceptance Testing: Purchasers and suppliers apply this test method for acceptance testing during procurement to ensure delivered goods meet contractual obligations concerning thickness, though caution is advised due to potential inter-laboratory variability.
• Research and Development: Laboratories and research institutions use this standard to benchmark new or modified RECPs against existing products, contributing to innovation and improvement in erosion control technologies.

Related Standards

For a comprehensive materials testing and quality control program, users may reference the following related ASTM standards:

• ASTM D4354: Practice for Sampling of Geosynthetics and Rolled Erosion Control Products (RECPs) for Testing
• ASTM E177: Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• ASTM E691: Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

These related standards support consistent sampling, terminology, and interlaboratory testing processes crucial to the effective application of ASTM D6525/D6525M.

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Keywords: ASTM D6525, rolled erosion control product thickness, nominal thickness measurement, ASTM RECP, erosion control testing, geosynthetics standards, product quality control, thickness testing method, ASTM international standard.

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: D6525/D6525M − 18 (Reapproved 2023)
Standard Test Method for
Measuring Nominal Thickness of Rolled Erosion Control
Products
This standard is issued under the fixed designation D6525/D6525M; 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 E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method covers the measurement of the nominal
thickness of rolled erosion control products.
3. Terminology
1.2 This test method does not provide thickness values for
3.1 Definitions:
rolled erosion control products under variable compressive
3.1.1 pressure, n—the force or load per unit area.
stresses. This test method determines nominal thickness, not
3.1.2 thickness—(1) the distance between one planar surface
necessarily minimum thickness.
and its opposite parallel and planar surface; (2) in rolled
1.3 The values stated in either SI units or inch-pound units
erosion control products, the distance between the upper and
are to be regarded separately as standard. The values stated in
lower surfaces of the material, measured under a specified
each system are not necessarily exact equivalents; therefore, to
pressure and time.
ensure conformance with the standard, each system shall be
used independently of the other, and values from the two
4. Summary of Test Method
systems shall not be combined.
4.1 The nominal thickness of rolled erosion control products
1.4 This standard does not purport to address all of the
is determined by observing the perpendicular distance that a
safety concerns, if any, associated with its use. It is the
movable plane is displaced from a parallel surface by the rolled
responsibility of the user of this standard to establish appro-
erosion control product while under a specified pressure of
priate safety, health, and environmental practices and deter-
0.2 kPa [0.029 psi] for 5 s.
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
5. Significance and Use
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the 5.1 Thickness is one of the basic physical properties used to
control the quality of rolled erosion control products. Thick-
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical ness values may aid in the calculation of other rolled erosion
control product parameters. Thickness, however, is not gener-
Barriers to Trade (TBT) Committee.
ally an indication of field performance and generally should not
be used in specifications. This test method is developed to aid
2. Referenced Documents
2 manufacturers, designers, and end users in comparing the
2.1 ASTM Standards:
thickness of rolled erosion control products through the use of
D4354 Practice for Sampling of Geosynthetics and Rolled
an accepted ASTM standard.
Erosion Control Products (RECPs) for Testing
5.2 The thickness of rolled erosion control products may
E177 Practice for Use of the Terms Precision and Bias in
vary considerably depending on the pressure applied to the
ASTM Test Methods
specimen during measurement. Where observed changes occur,
thickness decreases when applied pressure is increased. To
minimize variation, specific sample size and applied pressure
This test method is under the jurisdiction of ASTM Committee D35 on
are indicated in this test method to ensure all results are
Geosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-
thetic Erosion Control.
comparable.
Current edition approved May 1, 2023. Published May 2023. Originally
5.3 This test method may be used for acceptance testing of
approved in 2000. Last previous edition approved in 2018 as D6525/D6525M – 18.
DOI: 10.1520/D6525_D6525M-18R23.
commercial shipments of rolled erosion control products, but
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
caution is advised since information on between-laboratory
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
precision is incomplete. Comparative tests in accordance with
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 5.3.1 may be advised.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6525/D6525M − 18 (2023)
5.3.1 In case of a dispute arising from differences in machine elements with no specimen taken nearer than 100 mm
reported test results when using this test method for acceptance [4 in.] from the roll sides or ends, unless otherwise specified.
testing of commercial shipments, the purchaser and the sup-
7.4 Test Specimens—Specimen size shall be sufficient to
plier should conduct comparative tests to determine if there is
ensure that the edge of the specimen will extend beyond the
a statistical bias between their laboratories. Competent statis-
edge of the presser foot by 10 mm [0.39 in.] in all directions.
tical assistance is recommended for the investigation of bias.
7.5 Number of Specimens—Unless otherwise agreed upon,
At a minimum, the two parties should take a group of test
as when provided in an applicable material specification, take
specimens that are as homogeneous as possible and that are
the number of test specimens per laboratory sample as follows:
formed from a lot of material of the type in question. The test
7.5.1 Reliable Estimate of v—When there is a reliable
specimens should be randomly assigned in equal numbers to
estimate of v based upon extensive part records for similar
each laboratory for testing. The average results from the two
materials tested in the user’s laboratory as directed in this test
laboratories should be compared using Student’s t-test for
method, calculate the required number of specimens as follows
unpaired data and an acceptable probability level chosen by the
so that the user may expect at the 95 % probability level that
two parties before the testing is begun. If bias is found, either
the test result is not more than 5.0 % of the average above or
its cause must be found and corrected or the purchaser and
below the average of the sample:
supplier must agree to interpret future tests in light of the
known bias. n 5 t v ⁄ A (1)
~ !
NOTE 1—The user should be aware that the compressibility of the
where:
materials, their rebound characteristics, and the like will also affect the
n = number of test specimens (rounded upward to a whole
thickness of the rolled erosion control products following the time they are
number),
rolled up on rolls, shipped, and stored.
v = coefficient of variation of individual observations on
similar materials in the user’s laboratory under condi-
6. Apparatus
tions of single-operator precision, %,
6.1 Thickness Testing Instrument—The thickness gauge
t = value of Student’s t for one-sided limits, a 95 %
shall have a base (or anvil) and a free-moving presser foot plate
probability level, and the degrees of freedom associated
whose planar faces are parallel to each other to <0.1 mm. A
with the estimate of v (see Table 1), and
gauge with a 150.0 mm [6.00 in.] diameter presser foot, the
A = 5.0 % of the average, the value of the allowable
base of which shall extend at least 10 mm in all directions
variation.
farther than the edge of the approximately 17 500 mm circular
7.5.2 No Reliable Estimate of v—When there is no reliable
presser foot, shall be used for measurements of rolled erosion
estimate of v for the user’s laboratory, measurements shall be
control products. The instrument must be capable of measuring
made on a minimum of ten (10) specimens per laboratory
a maximum thickness of at least 25 mm [1 in.] to an accuracy
sample.
of 60.025 mm [0.001 in.]. The gauge shall be constructed to
permit gradual application of pressure to a specific force of
8. Conditioning
0.2 6 0.02 kPa [0.029 6 0.003 psi] for rolled erosion control
8.1 Bring the specimens to the moisture and temperature
products. Dead weight loading m
...