1、Designation: D 6707 06Standard Specification forCircular-Knit Geotextile for Use in Subsurface DrainageApplications1This standard is issued under the fixed designation D 6707; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers circular-knit geotextiles foruse on the outside of perforated pipes and Class B geocom
3、-posites per Specification D 7001 in drainage applications.1.2 The tests used to characterize the geotextile are intendedto ensure good workmanship and quality, and are not neces-sarily adequate for design purposes in view of the importanceof environmental factors and specific performance objectives
4、.Tests have been selected with essentially neutral aqueoussystems in mind. Other tests may be necessary to establishchemical resistance and durability under the conditions of aparticular application.1.3 This standard may involve hazardous materials, opera-tions, and equipment. This standard does not
5、 purport toaddress all of the safety concerns, if any, associated with itsuse. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory requirements prior to use.2. Referenced Documents2.1 ASTM Standards:
6、2D 123 Terminology Relating to TextilesD 4439 Terminology for GeosyntheticsD 4491 Test Methods for Water Permeability of Geotextilesby PermittivityD 4751 Test Method for Determining Apparent OpeningSize of a GeotextileD 6241 Test Method for the Static Puncture Strength ofGeotextiles and Geotextile-R
7、elated Products Using a50-mm ProbeD 7001 Specification for Geocomposites for PavementEdge Drains and Other High-Flow Applications3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 circular knita structure produced by interloopingone or more ends of yarn or comparable material in
8、acontinuously circular orientation around the fabric.3.1.2 filtrationthe equilibrium soil to geotextile systemthat allows for adequate liquid flow with limited soil lossacross the plane of the geotextile over the service lifetimecompatible with the application under consideration.3.2 Definitions in
9、this standard are in accordance withTerminology D 123 and D 4439, unless otherwise specified.4. Classification4.1 The circular-knit geotextiles covered by 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 areg
10、iven in 8.1 below.5. Significance and Use5.1 Circular knit geotextiles have been used extensively formany years as filtration geotextiles in combination with sub-surface drainage pipes.5.2 The test procedures and recommendations referred to inthis standard are considered adequate to determine the ac
11、cept-able performance properties of these geotextiles and arerecommended to specifiers and users of these products foracceptance testing.6. Materials and Manufacture6.1 The geotextile shall be manufactured from polymericmaterials.6.2 The geotextiles are manufactured by a circular knitprocess to ensu
12、re a consistent, continuous fabric without seamsalong its machine direction in order to envelope the perforatedpipe without flaws.1This specification is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.03 on Perme-ability and Filtratio
13、n.Current edition approved June 1, 2006. Published July 2006. Originally approvedin 2001. Last previous edition approved in 2001 as D 670701.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volu
14、me information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Fabrication Procedures7.1 The circular knit geotextiles, when applied to theperforated tubing, fit snu
15、gly and uniformly over the entireexterior surface of the pipe.7.2 If for any reason the circular knitted geotextile 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 th
16、efabric either by tying or with suitable adhesive tape.7.3 The overlaid fabric must be secured in such a manner soas 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
17、 damaged areaand must cover the entire circumference of the wrapped pipe inthe area where the repair is being made.8. Physical Requirements8.1 Table of Values:Test Method Type A Type HD 4491 Water Permittivity 2.4 s (-1) min 2.75 s (-1) minD 4751 AOS 0.60 mm max 0.425 mm maxTest Method Type A Type H
18、D 6241 Puncturestrength (N)800 min 800 min8.1.1 The physical values provided in this standard are notintended to address all soil conditions 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
19、.9. Quality Assurance9.1 When specified in the contract or purchase order, orwhen requested by the purchaser, the supplier shall affirm thatthe geotextile was manufactured, inspected and tested inaccordance with this specification and that it has been found tomeet the requirements of this specificat
20、ion.10. Keywords10.1 circular-knit; drainage pipe; fabric; filter; geocompos-ite; geotextile; perforated pipeASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised
21、that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.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 reap
22、proved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you
23、 feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address 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).D6707062
