ASTM_D_6575_-_D_6575M_-_22.pdf

Designation:D6575/D6575M22Standard Test Method forDetermining Stiffness of Geosynthetics Used as TurfReinforcement Mats(TRMs)1This standard is issued under the fixed designation D6575/D6575M;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 determination of the stiff-ness of geosynthetics used as turf reinforcement mats(TRMs).1.2 The method is applicable to TRMs of any fiber contentand any number of components.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 result in nonconformancewith the standard.1.4 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.1.5 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:2D123 Terminology Relating to TextilesD1388 Test Method for Stiffness of FabricsD1776/D1776M Practice for Conditioning and Testing Tex-tilesD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD6566 Test Method for Measuring Mass Per Unit Area ofTurf Reinforcement MatsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Federal Standards:3CCC-T-191b Textile Test Methods No.5206.23.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 bending length(general),na measure of the inter-action between geosynthetic weight and geosynthetic stiffnessas shown by the way in which a geosynthetic bends under itsown weight.It reflects the stiffness of a geosynthetic when bentin one plane under the force of gravity,and is one componentof drape.3.1.1.1 DiscussionBending length is called“drape stiff-ness”in Federal Specification CCC-T-191b.3.1.2 bending length(specific),nthe cube root of the ratioof the flexural rigidity to the mass per unit area.3.1.3 flexural rigidity(general),nresistance to bending.3.1.3.1 DiscussionResistance to bending or flexural rigid-ity is called“flex stiffness”in Federal Specification CCC-T-191b.3.1.4 flexural rigidity(specific),nthe couple on either endof a sample of unit width bent into unit curvature in the absenceof any tension.3.1.4.1 DiscussionThe methods measure the bendinglength.Flexural rigidity is calculated directly by multiplyingthe cube of the bending length by the weight per unit area(see3.1.2).3.1.5 stiffness,nresistance to bending.3.2 DefinitionsFor definitions of other textile or geosyn-thetic terms used in this test method,refer to TerminologiesD123 and D4439.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-thetic Erosion Control.Current edition approved July 1,2022.Published July 2022.Originally approvedin 2000.Last previous edition approved in 2016 as D6575/D6575M 16.DOI:10.1520/D6575_D6575M-22.2For 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.3Available from U.S.Government Publishing Office,732 N.Capitol St.,NW,Washington,DC 20401-0001,http:/www.gpo.gov.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.14.Significance and Use4.1 In general this test method is adapted from tests devel-oped for woven fabrics(previously designated as Test MethodD1388).4.2 The cantilever test method may not be suitable fortesting products that are very limp or have a marked tendencyto curl or twist at a cut edge.Cantilever Method5.Summary of Method5.1 A specimen of the TRM is slid in a direction parallel toits long di