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ASTM D4491-99a(2014)e1
Standard Test Methods for Water Permeability of Geotextiles by Permittivity (Includes all amendments And changes 7/23/2015).
Automaticky preložený názov:
Štandardné skúšobné metódy pre Priepustnosť geotextíliou vo permitivity
NORMA vydaná dňa 1.1.2014
Informácie o norme:
Označenie normy: ASTM D4491-99a(2014)e1
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.1.2014
Kód tovaru: NS-27457
Počet strán: 7
Približná hmotnosť: 21 g (0.05 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Anotácia textu normy ASTM D4491-99a(2014)e1 :
Keywords:
constant head, falling head, geotextiles, permeability, permittivity, ICS Number Code 59.080.70 (Geotextiles)
Doplňujúce informácie
| Significance and Use | ||||||||||||
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5.1 These test methods are considered satisfactory for acceptance testing of commercial shipments of geotextiles since the methods have been used extensively in the trade for acceptance testing. 5.1.1 In case of a dispute arising from differences in reported test results when using these test methods 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. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in 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 start of testing. If a bias is found, either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future test results in light of the known bias. 5.1.2 Permittivity is an indicator of the quantity of water that can pass through a geotextile in an isolated condition. 5.1.3 As there are many applications and environmental conditions under which a geotextile may be used, care should be taken when attempting to apply the results of these test methods to the field performance of a geotextile. 5.2 Since there are geotextiles of various thicknesses in use, evaluation in terms of their Darcy coefficient of permeabilities can be misleading. In many instances, it is more significant to evaluate the quantity of water that would pass through a geotextile under a given head over a particular cross-sectional area; this is expressed as permittivity. 5.3 If the permeability of an individual geotextile is of importance, a nominal coefficient of permeability, as related to geotechnical engineering, may be computed. By multiplying permittivity times the nominal thickness of the geotextile, as determined by Test Method D5199, the nominal coefficient of permeability is obtained. 1.1 These test methods cover
procedures for determining the hydraulic conductivity (water
permeability) of geotextiles in terms of permittivity under
standard testing conditions, in the uncompressed state. Included
are two procedures: the constant head method and the falling head
method.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units stated in parentheses are provided for information only. 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. |
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| 2. Referenced Documents | ||||||||||||
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