1、Designation: D6707/D6707M 06 (Reapproved 2016)1Standard Specification forCircular-Knit Geotextile for Use in Subsurface DrainageApplications1This standard is issued under the fixed designation D6707/D6707M; the number immediately following the designation indicates theyear of original adoption or, i
2、n 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.1NOTEDesignation was changed to dual and units information was corrected editorially in Januar
3、y 2016.1. Scope1.1 This specification covers circular-knit geotextiles foruse on the outside of perforated pipes and Class B geocom-posites per Specification D7001 in drainage applications.1.2 The tests used to characterize the geotextile are intendedto ensure good workmanship and quality, and are n
4、ot neces-sarily adequate for design purposes in view of the importanceof environmental factors and specific performance objectives.Tests have been selected with essentially neutral aqueoussystems in mind. Other tests may be necessary to establishchemical resistance and durability under the condition
5、s of aparticular application.1.3 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 r
6、esult in non-conformancewith the standard.1.4 This standard may involve hazardous materials,operations, and equipment. This standard does not purport toaddress all of the safety concerns, if any, associated with itsuse. It is the responsibility of the user of this standard toestablish appropriate sa
7、fety and health practices and deter-mine the applicability of regulatory requirements prior to use.2. Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD4439 Terminology for GeosyntheticsD4491/D4491M Test Methods for Water Permeability ofGeotextiles by PermittivityD4751 Te
8、st Method for Determining Apparent Opening Sizeof a GeotextileD6241 Test Method for Static Puncture Strength of Geotex-tiles and Geotextile-Related Products Using a 50-mmProbeD7001 Specification for Geocomposites for Pavement EdgeDrains and Other High-Flow Applications3. Terminology3.1 Definitions o
9、f Terms Specific to This Standard:3.1.1 circular knita structure produced by interloopingone or more ends of yarn or comparable material in acontinuously circular orientation around the fabric.3.1.2 filtrationthe equilibrium soil to geotextile systemthat allows for adequate liquid flow with limited
10、soil lossacross the plane of the geotextile over the service lifetimecompatible with the application under consideration.3.2 Definitions in this specification are in accordance withTerminologies D123 and D4439, unless otherwise specified.4. Classification4.1 The circular-knit geotextiles covered by
11、this specifica-tion are classified as follows:4.1.1 Type A: fabric4.1.2 Type H: fabric4.2 The characteristics of the two types of geotextile aregiven in 8.1 below.5. Significance and Use5.1 Circular knit geotextiles have been used extensively formany years as filtration geotextiles in combination wi
12、th sub-surface drainage pipes.5.2 The test procedures and recommendations referred to inthis standard are considered adequate to determine the accept-able performance properties of these geotextiles and arerecommended to specifiers and users of these products foracceptance testing.1This specificatio
13、n 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 Jan. 1, 2016. Published June 2016. Originally approvedin 2001. Last previous edition approved in 2011 as D670706(2011). D
14、OI:10.1520/D6707_D6707M-06R16E01.2For 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
15、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. Materials and Manufacture6.1 The geotextile shall be manufactured from polymericmaterials.6.2 The geotextiles are manufactured by a circular knitprocess to ensure a consistent, continuous fabric without seamsalo
16、ng its machine direction in order to envelope the perforatedpipe without flaws.7. Fabrication Procedures7.1 The circular knit geotextiles, when applied to theperforated tubing, fit snugly and uniformly over the entireexterior surface of the pipe.7.2 If for any reason the circular knitted geotextile
17、fabricbecomes damaged, repair of damaged area may be conductedin the field prior to installation, by wrapping or overlaying thedamaged area with similar knitted fabric and attaching thefabric either by tying or with suitable adhesive tape.7.3 The overlaid fabric must be secured in such a manner soas
18、 to prevent the patch from moving or shifting during normalinstallation procedures.7.4 The overlaid fabric must cover an area extending aminimum of 45 cm 18 in. on either side of the damaged areaand must cover the entire circumference of the wrapped pipe inthe area where the repair is being made.8.
19、Physical Requirements8.1 Table of Values:Test Method Type A Type HD4491/D4491M Water Permittivity 2.4 s (-1) min 2.75 s (-1) minD4751 AOS 0.60 mm max 0.425 mm maxD6241 Puncture strength (N) 800 min 800 min8.1.1 The physical values provided in this standard are notintended to address all soil conditi
20、ons which may be encoun-tered.8.1.2 Specialty circular knit geotextiles may be available forother soil conditions.8.1.3 Fabric designed to fit nominal O.D. of pipe.9. Quality Assurance9.1 When specified in the contract or purchase order, orwhen requested by the purchaser, the supplier shall affirm t
21、hatthe geotextile was manufactured, inspected and tested inaccordance with this specification and that it has been found tomeet the requirements of this specification.10. Keywords10.1 circular-knit; drainage pipe; fabric; filter; geocompos-ite; geotextile; perforated pipeASTM International takes no
22、position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsi
23、bility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to
24、 ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the addr
25、ess shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 06 (2016)12
