ASTM D7178-22
Standard Practice for Determining the Number of Constrictions “m ” of Non-Woven Geotextiles
- Standard No.
- ASTM D7178-22
- Release Date
- 2022
- Published By
- American Society for Testing and Materials (ASTM)
- Latest
- ASTM D7178-22
- Scope
- 1.1 This practice describes the procedure used along with existing test methods 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 nonwoven 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 constrictions is relevant in filtration applications where piping or clogging concerns are to be controlled with a high level of confidence, that is, for filter 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM D7178-22 Referenced Document
- ASTM D1577 Standard Test Methods for Linear Density of Textile Fibers
- ASTM D4439 Standard Terminology for Geosynthetics*， 2024-02-01 Update
- ASTM D4751 Standard Test Method for Determining Apparent Opening Size of a Geotextile
- ASTM D5199 Standard Test Method for Measuring the Nominal Thickness of Geosynthetics*， 2024-04-22 Update
- ASTM D5261 Standard Test Method for Measuring Mass per Unit Area of Geotextiles
- ASTM D6767 Standard Test Method for Pore Size Characteristics of Geotextiles by Capillary Flow Test
ASTM D7178-22 history
- 2022 ASTM D7178-22 Standard Practice for Determining the Number of Constrictions “
m ” of Non-Woven Geotextiles - 2016 ASTM D7178-16e1 Standard Practice for Determining the Number of Constrictions &x201c;
m &x201d; of Non-Woven Geotextiles as a Complementary Filtration Property - 2016 ASTM D7178-16 Standard Practice for Determining the Number of Constrictions &x201c;
m &x201d; of Non-Woven Geotextiles as a Complementary Filtration Property - 2006 ASTM D7178-06(2011) Standard Practice for Determining the Number of Constrictions "
m " of Non-Woven Geotextiles as a Complementary Filtration Property - 2006 ASTM D7178-06 Standard Practice for Determining the Number of Constrictions "
m " of Non-Woven Geotextiles as a Complementary Filtration Property
