ASTM D6574-00(2006)
(Test Method)Standard Test Method for Determining the (In-Plane) Hydraulic Transmissivity of a Geosynthetic by Radial Flow
Standard Test Method for Determining the (In-Plane) Hydraulic Transmissivity of a Geosynthetic by Radial Flow
SIGNIFICANCE AND USE
This test method is an index test to estimate and compare the in-plane hydraulic transmissivity of one or several candidate geosynthetics under specific gradient and stress conditions.
This test method may be used for acceptance testing of commercial shipments of geosynthetics, but caution is advised since information about between-laboratory precision is incomplete. Comparative tests as directed in 5.2.1 are advisable.
5.2.1 In case of a dispute arising from differences in reported test results when using this procedure for acceptance of commercial shipments, the purchaser and the supplier should first confirm that the tests have been conducted using comparable test parameters including specimen conditioning, normal stress, hydraulic system gradient, etc. Comparative tests then should be conducted to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As 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 the material in question. The test specimens should be assigned randomly to each laboratory for testing. The average results from the two laboratories should be compared using the Student’t-test for unpaired data and an acceptable probability level chosen by the two parties before testing is begun. If bias is found, either its cause must be found and corrected or the purchaser and supplier must agree to interpret future test results in light of the known bias.
SCOPE
1.1 This test method covers the procedure for determining the in-plane transmissivity of geosynthetics under varying normal compressive stresses using a radial flow apparatus. The test is intended to be an index test used primarily for geotextiles, although other products composed of geotextiles and geotextile-type materials may be suitable for testing with this test method.
1.2 This test method is based on the assumption that the transmissivity of the geosynthetic is independent of orientation of the flow and is therefore limited to geosynthetics that have similar transmissivity in all directions and should not be used for materials with oriented flow behavior.
1.3 This test method has been developed specifically for geosynthetics that have transmissivity values on the order of or less than 2 104 m2/s. Consider using Test Method D 4716 for geosynthetics with transmissivity values higher than 2 104 m2/s.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
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Standards Content (Sample)
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Designation:D6574–00 (Reapproved 2006)
Standard Test Method for
Determining the (In-Plane) Hydraulic Transmissivity of a
1
Geosynthetic by Radial Flow
This standard is issued under the fixed designation D6574; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D4491 Test Methods for Water Permeability of Geotextiles
by Permittivity
1.1 This test method covers the procedure for determining
D4716 Test Method for Determining the (In-plane) Flow
the in-plane transmissivity of geosynthetics under varying
Rate per Unit Width and Hydraulic Transmissivity of a
normalcompressivestressesusingaradialflowapparatus.The
Geosynthetic Using a Constant Head
test is intended to be an index test used primarily for geotex-
D5092 PracticeforDesignandInstallationofGroundWater
tiles, although other products composed of geotextiles and
Monitoring Wells
geotextile-type materials may be suitable for testing with this
test method.
3. Terminology
1.2 This test method is based on the assumption that the
3.1 For definitions of terms relating to geosynthetics, refer
transmissivityofthegeosyntheticisindependentoforientation
to Terminology D4439.
of the flow and is therefore limited to geosynthetics that have
3.2 Definitions:
similar transmissivity in all directions and should not be used
3.2.1 geosynthetic, n—a planar product manufactured from
for materials with oriented flow behavior.
polymeric material used with soil, rock, earth, or other geo-
1.3 This test method has been developed specifically for
technical engineering related material as an integral part of a
geosyntheticsthathavetransmissivityvaluesontheorderofor
−4 2
man-made project, structure, or system. D4439
less than 2 3 10 m /s. Consider using Test Method D4716
3.2.2 geotextile, n—a permeable geosynthetic comprised
for geosynthetics with transmissivity values higher than 2 3
−4 2
solely of textiles. D4439
10 m /s.
3.2.3 gravity flow, n—flow in a direction parallel to the
1.4 The values stated in SI units are to be regarded as
planeofageosyntheticdrivenpredominantlybyadifferencein
standard. The values given in parentheses are for information
elevation between the inlet and outflow points of a specimen.
only.
D4439
1.5 This standard does not purport to address all of the
3.2.3.1 Discussion—The pressure at the outflow is consid-
safety concerns, if any, associated with its use. It is the
ered to be atmospheric.
responsibility of the user of this standard to establish appro-
3.2.4 head (static), n—theheightaboveastandarddatumof
priate safety and health practices and determine the applica-
the surface of a column of water (or other liquid) that can be
bility of regulatory limitations prior to use.
supported by a static pressure at a given point. The static head
2. Referenced Documents is the sum of the elevation head and the pressure head.
2
D5092
2.1 ASTM Standards:
3.2.5 hydraulic gradient, i, s (D), n—the loss of hydraulic
D4354 Practice for Sampling of Geosynthetics for Testing
head per unit distance of flow, dH/dL. D4439
D4439 Terminology for Geosynthetics
3.2.5.1 Discussion—Thegradientisnotconstantfrompoint
to point in the direction of flow in the radial flow test. The
1
This test method is under the jurisdiction of ASTM Committee D35 on gradient (mathematically) varies with the inverse of the radial
Geosynthetics and is the direct responsibility of Subcommittee D35.03 on Perme-
distance from the center.
ability and Filtration.
2 −1
3.2.6 hydraulic transmissivity, u (L T ), n—for a geosyn-
Current edition approved June 1, 2006. Published June 2006. Originally
thetic, the volumetric flow rate per unit width of specimen per
approved in 2000. Last previous edition approved in 2000 as D6574–00. DOI:
10.1520/D6574-00R06.
unit gradient in a direction parallel to the plane of the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
specimen. D4439
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3.2.6.1 Discussion—Transmissivity is technically appli-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. cable only to saturated laminar flow hydraulic conditions.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6574–00 (2006)
3.2.7 index test, n—a test procedure, which may contain a sectional flow area and the hydraulic gradient vary from point
known bias but which may be used to establish an order for a to point along any radial flow line while remaining constant
set of s
...
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