ASTM D6524-00

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Designation:D6524–00
Standard Test Method for
Measuring the Resiliency of Turf Reinforcement Mats
(TRMs)
This standard is issued under the fixed designation D 6524; 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 stabilized, nondegradable, synthetic fibers, nettings, or fila-
ments, or combination thereof, processed into three-
1.1 This test method is used to measure the resiliency or
dimensional reinforcement matrices.
recovery of turf reinforcement mats (TRMs) after they have
3.2 For definitions of other textile terms used in this test
been subjected to three cycles of loading at 689 kPa (100 psi)
method, refer to Terminology D 123.
for 1 min/per cycle.
3.3 For definitions of other terms relating to geotextiles and
1.2 The values stated in SI units are to be regarded as the
geomembranes used in this test method, refer to Terminology
standard. The values are provided in inch-pound units for
D 4439.
information only.
1.3 This test method does not provide resiliency values for
4. Summary of Test Method
TRMs under variable normal compressive stresses. This test
4.1 The nominal resiliency of TRMs is determined by
method determines nominal resiliency.
observing the thickness of the TRM before and after it is
1.4 This standard does not purport to address all of the
subjected to three cycles of loading at 689 kPa (100 psi) for 1
safety concerns, if any, associated with its use. It is the
min/cycle.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 Resiliency may be used to control the quality of many
TRMs. Resiliency may be indicative of a TRM’s ability to
2. Referenced Documents
retain original configuration after exposure to the stresses
2.1 ASTM Standards:
2 which may be exerted during manufacture, shipping, and
D 123 Terminology Relating to Textiles
2 installation. Resiliency is not generally indicative of field
D 1776 Practice for Conditioning Textiles for Testing
2 performance.
D 1777 Test Method for Thickness of Textiles Materials
3 5.2 The resiliency of TRMs may vary considerably depend-
D 4354 Practice for Sampling of Geosynthetics for Testing
3 ing on the pressure applied to the specimen during loading
D 4439 Terminology for Geotextiles
cycles.To minimize variation, specific sample size and applied
D 5199 Test Method for Measuring Nominal Thickness of
3 pressure are indicated in this test method to ensure all results
Geotextiles and Geomembranes
are comparable.
3. Terminology 5.3 To determine the effect of different pressure loadings on
the final thickness of TRMs, use this test method.
3.1 Definitions:
5.4 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 TRMs, but caution is advised since
3.1.2 thickness—(1) the distance between one planar sur-
information on between-laboratory precision is incomplete.
face and its opposite parallel and planar surface; (2) forTRMs,
Comparative tests, in accordance with 5.4.1 may be advisable
the distance between the upper and lower surfaces of the
5.4.1 In a case of a dispute arising from differences in
material, measured under a specified pressure and time.
reported test results when using this test method for acceptance
3.1.3 turf reinforcement mat (TRM), n—a long-term nonde-
testing of commercial shipments, the purchaser and the sup-
gradable rolled erosion control product composed of UV
plier should conduct comparative tests to determine if there is
a statistical bias between their laboratories. Competent statis-
This test method is under the jurisdiction of ASTM Committee D-35 on tical assistance is recommended for the investigation of bias.
Geosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-
As a minimum, the two parties should take a group of test
thetic Erosion Control.
specimens that are as homogeneous as possible and that are
Current edition approved Feb. 10, 2000. Published April 2000.
formed from a lot of material of the type in question. The test
Annual Book of ASTM Standards, Vol 07.01.
Annual Book of ASTM Standards, Vol 04.13.
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D6524–00
specimens should be randomly assigned in equal numbers to
n 5 ~tV/A! (1)
each laboratory for testing. The average results from the two
where:
laboratories should be compared using Student’s t-test for
n = number of test specimens (rounded upward to a whole
unpaireddateandanacceptableprobabilitylevelchosenbythe
number),
two begun. If bias is found, either its cause must corrected, or
v = reliable estimate of the coefficient of variation of
the purchaser and be found and interpret future tests in supplier
individual observations on similar materials in the
must agree to the light of the known bias.
user’s laboratory under conditions of single-operation
NOTE 1—The user should be aware that the compressibility of the
precision, %,
materials, their rebound characteristics, and the like will also be affected
t = value of Student’s t for one-sided limits (see Table 1),
by the thickness of the TRMs following the time when they are rolled up
a 95 % probability level, and the degrees of freedom
on rolls shipped and stored.
associated with the estimate of v, and
A = 5.0 % of the average, the value of the allowable
6. Apparatus
variation.
6.1 Thickness Testing Instrument—The thickness gage shall
7.5.2 No Reliable Estimate of v—When there is no reliable
have a base (or anvil) and a free-moving presser foot plate
estimate of v for the user’s laboratory, Eq 1 should not be used
whose planar faces are parallel to each other to <0.1 mm. A
directly. Instead, specify the fixed number (10) of specimens.
gage with a 150-mm (6-in.) diameter presser foot, the base
The number of specimens is calculated using v = 9.5 % of the
shall extend at least 10 mm in all directions further than the
2 average. These values for v are somewhat larger
...