ASTM_D_7205_-_D_7205M_-_21.pdf

Designation:D7205/D7205M21Standard Test Method forTensile Properties of Fiber Reinforced Polymer MatrixComposite Bars1This standard is issued under the fixed designation D7205/D7205M;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 determines the quasi-static longitudinaltensile strength and elongation properties of fiber reinforcedpolymer matrix(FRP)composite bars commonly used astensile elements in reinforced,prestressed,or post-tensionedconcrete.NOTE1Additional procedures for determining tensile properties ofpolymer matrix composites may be found in Test Methods D3039/D3039M and D3916.1.2 Linear elements used for reinforcing Portland cementconcrete are referred to as bars,rebar,rods,or tendons,depending on the specific application.This test method isapplicable to all such reinforcements within the limitationsnoted in the method.The test articles are referred to as bars inthis test method.In general,bars have solid cross-sections anda regular pattern of surface undulations or a coating of bondedparticles,or both,that promote mechanical interlock betweenthe bar and concrete.The test method is also appropriate foruse with linear segments cut from a grid.Specific details forpreparing and testing of bars and grids are provided.In somecases,anchors may be necessary to prevent grip-induceddamage to the ends of the bar or grid.Suggestions for a groutedtype of anchor are provided in Appendix X1.1.3 The strength values provided by this method are short-term static strengths that do not account for sustained static orfatigue loading.Additional material characterization may berequired,especially for bars that are to be used under highlevels of sustained or repeated loading.1.4 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system are not necessarily exact equiva-lents;therefore,to ensure conformance with the standard,eachsystem shall be used independently of the other,and valuesfrom the two systems shall not be combined.1.4.1 Within the text,the inch-pound units are shown inbrackets.1.5 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.1.6 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:2D792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883 Terminology Relating to PlasticsD3039/D3039M Test Method for Tensile Properties of Poly-mer Matrix Composite MaterialsD3878 Terminology for Composite MaterialsD3916 Test Method for Tensile Properties of PultrudedGlass-Fiber-Reinforced Plastic RodD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsD7957/D7957M Specification for Solid Round Glass FiberReinforced Polymer Bars for Concrete ReinforcementE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE83 Practice for Verification and Classification of Exten-someter SystemsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE456 Terminology Relating to Quality and Statistics1This test method is under the jurisidiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.10 onComposites for Civil Structures.Current edition approved May 15,2021.Published June 2021.Originallyapproved in 2006.Last previous edition approved in 2016 as D7205/D7205M 06(2016).DOI:10.1520/D7205_D7205M-21.2For 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.1E1012 Practice for Verifica