ASTM_D_6574_-_D_6574M_-_13_2021.pdf

Designation:D6574/D6574M13(Reapproved 2021)Standard Test Method forDetermining the(In-Plane)Hydraulic Transmissivity of aGeosynthetic by Radial Flow1This standard is issued under the fixed designation D6574/D6574M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the procedure for determiningthe in-plane transmissivity of geosynthetics under varyingnormal compressive stresses using a radial flow apparatus.Thetest is intended to be an index test used primarily forgeotextiles,although other products composed of geotextilesand geotextile-type materials may be suitable for testing withthis test method.1.2 This test method is based on the assumption that thetransmissivity of the geosynthetic is independent of orientationof the flow and is,therefore,limited to geosynthetics that havesimilar transmissivity in all directions and should not be usedfor materials with oriented flow behavior.1.3 This test method has been developed specifically forgeosynthetics that have transmissivity values on the order of orless than 2 104m2/s.Consider using Test Method D4716/D4716M for geosynthetics with transmissivity values higherthan 2 104m2/s.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith the standard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD4716/D4716M Test Method for Determining the(In-plane)Flow Rate per Unit Width and Hydraulic Transmissivityof a Geosynthetic Using a Constant HeadD5092/D5092M Practice for Design and Installation ofGroundwater Monitoring Wells3.Terminology3.1 For definitions of terms relating to geosynthetics,referto Terminology D4439.3.2 Definitions:3.2.1 geosynthetic,na planar product manufactured frompolymeric material used with soil,rock,earth,or other geo-technical engineering related material as an integral part of aman-made project,structure,or system.D44393.2.2 geotextile,na permeable geosynthetic comprisedsolely of textiles.D44393.2.3 gravity flow,nflow in a direction parallel to theplane of a geosynthetic driven predominantly by a difference inelevation between the inlet and outflow points of a specimen.D44393.2.3.1 DiscussionThe pressure at the outflow is consid-ered to be atmospheric.3.2.4 head(static),nthe height above a standard datum ofthe surface of a column of water(or other liquid)that can besupported by a static pressure at a given point.The static headis the sum of the elevation head and the pressure head.D5092/D5092M3.2.5 hydraulic gradient,i,s(D),nthe loss of hydraulichead per unit distance of flow,dH/dL.D44393.2.5.1 DiscussionThe gradient is not constant from pointto point in the direction of flow in the radial flow test.The1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.03 on Perme-ability and Filtration.Current edition approved May 1,2021.Published May 2021.Originallyapproved in 2000.Last previous edition approved in 2013 as D6574/D6574M 13.DOI:10.1520/D6574_D6574M-13R21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1gradient(mathematically)varies with the inverse of the radialdistance from the center.3.2.6 hydraulic transmissivity,(L2T1),nfor ageosy