ASTM_D_6524_-_D_6524M_-_16_2021.pdf

Designation:D6524/D6524M16(Reapproved 2021)Standard Test Method forMeasuring the Resiliency of Turf Reinforcement Mats(TRMs)1This standard is issued under the fixed designation D6524/D6524M;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 resiliency or recovery of turfreinforcement mats(TRMs)after they have been subjected tothree cycles of loading at 689 kPa 100 psi for 1 min/per cycle.1.2 This test method does not provide resiliency values forTRMs under variable normal compressive stresses.This testmethod determines nominal resiliency.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.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 TextilesD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for Geosynthetics3.Terminology3.1 Definitions:3.1.1 pressure,nthe force or load per unit area.3.1.2 thickness(1)the distance between one planar surfaceand its opposite parallel and planar surface;(2)for TRMs,thedistance between the upper and lower surfaces of the material,measured under a specified pressure and time.3.1.3 turf reinforcement mat(TRM),na long-term nonde-gradable rolled erosion control product composed of UVstabilized,nondegradable,synthetic fibers,nettings,orfilaments,or combination thereof,processed into three-dimensional reinforcement matrices.3.2 For definitions of other textile terms used in this testmethod,refer to Terminology D123.3.3 For definitions of other terms relating to geotextiles andgeomembranes used in this test method,refer to TerminologyD4439.4.Summary of Test Method4.1 The nominal resiliency of TRMs is determined byobserving the thickness of the TRM before and after it issubjected to three cycles of loading at 689 kPa 100 psi for1 min cycle.5.Significance and Use5.1 Resiliency may be used to control the quality of manyTRMs.Resiliency may be indicative of a TRMs ability toretain original configuration after exposure to the stresseswhich may be exerted during manufacture,shipping,andinstallation.Resiliency is not generally indicative of fieldperformance.5.2 The resiliency of TRMs may vary considerably depend-ing on the pressure applied to the specimen during loadingcycles.To minimize variation,specific sample size and appliedpressure are indicated in this test method to ensure all resultsare comparable.5.3 To determine the effect of different pressure loadings onthe final thickness of TRMs,use this test method.5.4 This test method may be used for acceptance testing ofcommercial shipments of TRMs,but caution is advised since1This 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 May 1,2021.Published May 2021.Originallyapproved in 2000.Last previous edition approved in 2016 as D6524/D6524M 16.DOI:10.1520/D6524_D6524M-16R21.2For 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.1information on between-laboratory precision is incomplete.Comparative tests in accordance with 5.4.1 may be advisable.5.4.1 In a case of a dispute arising from differences inreported test results when using this test method for acceptancetesting of commer