ASTM_D_6524_-_00_2011.pdf

Designation:D652400(Reapproved 2011)Standard Test Method forMeasuring the Resiliency of Turf Reinforcement Mats(TRMs)1This standard is issued under the fixed designation D6524;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript 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 SI units are to be regarded asstandard.The values given in parentheses are for informationonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD4354 Practice for Sampling of Geosynthetics 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,or fila-ments,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)for 1min/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 sinceinformation 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 commercial shipments,the purchaser and the sup-plier should conduct comparative tests to determine if there isa statistical bias between their laboratories.Competent statis-tical assistance is recommended for the investigation of bias.As a minimum,the two parties should take a group of testspecimens that are as homogeneous as possible and that are1This 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 June 1,2011.Published July 2011.Originally approvedin 2000.Last previous edition approved in 2006 as D6524 00(2006).DOI:10.1520/D6524-00R11.2For 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 States1 formed from a lot of material of the type in question.The testspecimens should be randomly assigned in equal numbers toeach laboratory for testing.The average results from the twolaboratories should be compared using Students t-test forunpaired date and an acceptable probability level chosen by thetwo begun.If bias is found,either its cause must corrected,orthe purchaser and be found and interpret future tests in suppliermust agree to the light of the known bias.NOTE1The user should be aware that the compressibility of thematerials,their rebound characteristics,a