ASTM_D_6525_-_D_6525M_-_14.pdf

Designation:D6525/D6525M14Standard Test Method forMeasuring Nominal Thickness of Rolled Erosion ControlProducts1This standard is issued under the fixed designation D6525/D6525M;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 measurement of the nominalthickness of permanent rolled erosion control products.1.2 This test method does not provide thickness values forpermanent rolled erosion control products under variablecompressive stresses.This test method determines nominalthickness,not necessarily minimum thickness.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 non-conformancewith 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD5199 Test Method for Measuring the Nominal Thicknessof GeosyntheticsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.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)in permanentrolled erosion control products,the distance between the upperand lower surfaces of the material,measured under a specifiedpressure and time.4.Summary of Test Method4.1 The nominal thickness of permanent rolled erosioncontrol products is determined by observing the perpendiculardistance that a movable plane is displaced from a parallelsurface by the permanent rolled erosion control product whileunder a specified pressure of 0.2 kPa 0.029 psi for 5 s.5.Significance and Use5.1 Thickness is one of the basic physical properties used tocontrol the quality of permanent rolled erosion control prod-ucts.Thickness values may aid in the calculation of otherpermanent rolled erosion control product parameters.Thick-ness however is not generally an indication of field perfor-mance and generally should not be used in specifications.Thistest method is developed to aid manufacturers,designers,andend users in comparing the thickness of permanent rollederosion control products through the use of an accepted ASTMstandard.5.2 The thickness of permanent rolled erosion control prod-ucts may vary considerably depending on the pressure appliedto the specimen during measurement.Where observed changesoccur,thickness decreases when applied pressure is increased.To minimize variation,specific sample size and applied pres-sure are indicated in this test method to ensure all results arecomparable.5.3 This test method may be used for acceptance testing ofcommercial shipments of permanent rolled erosion controlproducts,but caution is advised since information on between-laboratory precision is incomplete.Comparative tests in accor-dance with 5.3.1 may be advised.5.3.1 In 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.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 Aug.1,2014.Published September 2014.Originallyapproved in 2000.Last previous edition approved in 2012 as D6525 12.DOI:10.1520/D6525_D6525M-14.2For 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 As a minimum,the two parties should take a group of testspecimens that are as homogeneous as possible and that areformed 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 usin