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Standard Practice for Determining the Number of Constrictions ""m"" of Non-Woven Geotextiles as a Complementary Filtration Property
Automaticky přeložený název:
Standardní praktiky pro stanovení počtu zúženými "m" z netkané geotextilie jako doplňkový Filtration nemovitosti
NORMA vydána dne 1.6.2011
Označení normy: ASTM D7178-06(2011)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.6.2011
Kód zboží: NS-37776
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
clogging, constriction, filtration, geotextile, mechanically bonded, non-woven, number of constrictions, opening size, piping, Clogging, Filtration, Geotextiles, Nonwoven geotextile fabrics, Opening size, ICS Number Code 59.080.70 (Geotextiles)
Significance and Use | ||||||||||||
This practice provides a calculation method for determining the number of constrictions m of a non-woven geotextile (or of a layer of a composite material). This standard is not applicable to woven geotextiles, knitted geotextiles, heat-bonded geotextiles or any other type of geosynthetic. |
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1. Scope | ||||||||||||
1.1 This practice describes the procedure used along with existing test method to determine the number of constrictions m of mechanically bonded non-woven geotextiles, based on thickness, mass per unit area and fiber properties 1.2 The number of constrictions is a property of non-woven geotextiles, which is complementary to opening size to predict their filtration behavior. It can be used to differentiate non-woven geotextiles with similar opening sizes but different structures (thickness, weight, fiber diameter, etc.). However, more research is needed to assess its significance when comparing two products with different opening sizes. 1.3 Consideration of the number of constriction is relevant in filtration applications where piping or clogging concerns are to be controlled with a high level of confidence, that is, for filters applications in critical soils. 1.4 This standard is for design purposes only and is not intended for quality control purposes. 1.5 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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