ASTM D6575-00

Standard Test Method for Determining Stiffness of Geosynthetics Used as Turf Reinforcement Mats (TRM's)

SCOPE
1.1 This test method is described for determining the stiffness of geosynthetics used as Turf Reinforcement Mats (TRM).
1.2 The method is applicable to TRMs of any fiber content and any number of components.
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.

General Information

• Status: Historical
• Publication Date: 09-Jul-2000
• ICS: 65.020.20 - Plant growing
• Technical Committee: D35 - Geosynthetics
• Drafting Committee: D35.05 - Geosynthetic Erosion Control

Relations

• Replaced By: ASTM D6575-00(2006) - Standard Test Method for Determining Stiffness of Geosynthetics Used as Turf Reinforcement Mats (TRMs)
• Effective Date: 01-Jun-2006

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6575–00
Standard Test Method for
Determining Stiffness of Geosynthetics Used as Turf
Reinforcement Mats (TRM’s)
This standard is issued under the fixed designation D 6575; 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 3.1.2 flexural rigidity, n:
3.1.2.1 general, adj—resistance to bending.
1.1 This test method is described for determining the
3.1.2.2 Discussion—Resistance to bending or “flexural ri-
stiffness of geosynthetics used as Turf Reinforcement Mats
gidity” is called flex stiffness in Federal Specification CCC-T-
(TRM).
191b.
1.2 The method is applicable to TRMs of any fiber content
3.1.2.3 specific, adj—the couple on either end of a sample
and any number of components.
of unit width bent into unit curvature in the absence of any
1.3 This standard does not purport to address all of the
tension.
safety concerns, if any, associated with its use. It is the
3.1.2.4 Discussion—The methods measure the bending
responsibility of the user of this standard to establish appro-
length. Flexural rigidity is calculated directly by multiplying
priate safety and health practices and determine the applica-
the cube of the bending length by the weight per unit area (see
bility of regulatory limitations prior to use.
3.1.1.3).
2. Referenced Documents
3.1.3 stiffness, n—resistance to bending.
3.2 Definitions—For definitions of other textile or geosyn-
2.1 ASTM Standards:
thetic terms used in this test method, refer to Terminologies
D 123 Terminology Relating to Textiles
D 123 and D 4439.
D 1776 Practice for Conditioning Textiles for Testing
D 4354 Practice for Sampling of Geosynthetics for Testing
4. Significance and Use
D 4439 Terminology for Geotextiles
4.1 In general this test method is adapted from tests devel-
D 5261 Test Method for Measuring Mass per Unit Area of
oped for woven fabrics (previously designated as D 1388).
Geotextiles
4.2 The cantilever test method may not be suitable for
2.2 Federal Standards:
testing products that are very limp or have a marked tendency
CCC-T-191b Textile Test Methods No. 5206.2
to curl or twist at a cut edge.
3. Terminology
Cantilever Method
3.1 Definitions of Terms Specific to This Standard:
3.1.1 bending length, n:
5. Summary of Method
3.1.1.1 general, adj—a measure of the interaction between
5.1 A specimen of the TRM is slid in a direction parallel to
geosynthetic weight and geosynthetic stiffness as shown by the
its long dimension, so that its end projects from the edge of a
way in which a geosynthetic bends under its own weight. It
horizontal surface. The length of overhang is measured when
reflects the stiffness of a geosynthetic when bent in one plane
the tip of the test specimen is depressed under its own weight
under the force of gravity, and is one component of drape.
to the point where the line joining the tip to the edge of the
3.1.1.2 Discussion—Bending length is called drape stiffness
platform makes an angle of 41.5° with the horizontal. One half
in Federal Specification CCC-T-191b.
of this length is the bending length of the specimen. The cube
3.1.1.3 specific, adj—the cube root of the ratio of the
of this quantity multiplied by the weight per unit area of the
flexural rigidity to the mass per unit area.
geosynthetic is the flexural rigidity.
5.2 This test method is known also as the Single Cantilever
1 Test.
This test method is under the jurisdiction of ASTM Committee D35 on
Geosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-
6. Apparatus
thetic Erosion Control.
Current edition approved July 10, 2000. Published October 2000.
6.1 Stiffness Tester, having the following parts:
Annual Book of ASTM Standards, Vol. 07.01.
Annual Book of ASTM Standards, Vol 04.13.
Available from the Superintendent of Documents, US Government Printing
Office, Washington, DC 20402.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6575–00
6.1.1 Horizontal Platform,withaminimumareaof18by12 9.4 Take four readings from each specimen, with each side
in. (457.2 by 304.8 mm) and having a smooth low-friction, flat up, first at one end and then the other.
surface such as polished metal or plastic. A leveling bubble 9.5 Determine the mass per unit area of the geosynthetic
shall be incorporated in the platform, or be available for according to [see Text Method D 5261].
verification that the horizontal platform is level.
10. Calculation
6.1.2 Indicator, inclined at an angle of 41.5° below the
10.1 Unless otherwise specified, average the four readings
plane of the platform surface.
obtained from all the specimens cut parallel to the machine
6.1.3 Weight, consisting of a metal bar not less than 4 by 18
1 direction. Do the same for those cut parallel to the cross-
in. (101.6 by 457.2 mm) by about ⁄8 in. (3 mm) thick.
machine direction. In some cases it may be of interest to
6.1.4 Scale and Pointer, to measure the length of the
differentiatebetweenthesidesofthegeosyntheticbyaveraging
overhang.
those readings made with the face side up separately from
7. Conditioning those with t
...