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ASTM International - ASTM D7178-06

Standard Practice for Determining the Number of Constrictions " m " of Non-Woven Geotextiles as a Complementary Filtration Property

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Organization: ASTM International
Publication Date: 1 June 2006
Status: inactive
Page Count: 4
ICS Code (Geotextiles): 59.080.70
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... View More

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.

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.

Document History

June 1, 2016
Standard Practice for Determining the Number of Constrictions “m” of Non-Woven Geotextiles as a Complementary Filtration Property
5.1 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...
June 1, 2016
Standard Practice for Determining the Number of Constrictions “m” of Non-Woven Geotextiles as a Complementary Filtration Property
5.1 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...
June 1, 2011
Standard Practice for Determining the Number of Constrictions "m" of Non-Woven Geotextiles as a Complementary Filtration Property
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...
ASTM D7178-06
June 1, 2006
Standard Practice for Determining the Number of Constrictions "m" of Non-Woven Geotextiles as a Complementary Filtration Property
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...
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