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ASTM-D7178:2006 Edition

ASTM-D7178:2006 Edition

$35.75

D7178-06 Standard Practice for Determining the Number of Constrictions “m” of Non-Woven Geotextiles as a Complementary Filtration Property

Published By Publication Date Number of Pages
ASTM 2006 5
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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.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
Summary of Practice
Significance and Use
2 Procedure
Report
Precision and Bias
Keywords
X1. PHYSICAL SIGNIFICANCE OF THE NUMBER OF CONSTRICTION
X1.1 Alternate Equations Describing the Number of Constriction
3 X1.2 Constrictions and Filtration Opening Size Distributions
X1.3 Significance of the Number of Constrictions with Regard to Opening Size Distribution and Soil Filtration
FIG. X1.1
4 REFERENCES
FIG. X1.2

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