1、Designation:D7957/D7957M22Standard Specification forSolid Round Glass Fiber Reinforced Polymer Bars forConcrete Reinforcement1This standard is issued under the fixed designation D7957/D7957M;the number immediately following the designation indicates theyear of original adoption or,in the case of rev
2、ision,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 specification covers glass fiber reinforced polymer(GFRP)bars,provided in cut lengths and bent shape
3、s andhaving an external surface enhancement for concrete reinforce-ment.Bars covered by this specification shall meet the require-ments for geometric,material,mechanical,and physical prop-erties described herein.1.2 Bars produced according to this standard are qualifiedusing the test methods and mus
4、t meet the requirements givenby Table 1.Quality control and certification of production lotsof bars are completed using the test methods and must meet therequirements given in Table 2.1.3 The text of this specification references notes andfootnotes which provide explanatory material.These notes andf
5、ootnotes(excluding those in tables)shall not be considered asrequirements of the specification.1.4 The following FRP materials are not covered by thisspecification:1.4.1 Bars made of more than one load-bearing fiber type(that is,hybrid FRP).1.4.2 Bars having no external surface enhancement(that is,p
6、lain or smooth bars,or dowels).1.4.3 Bars with geometries other than solid,round crosssections.1.4.4 Pre-manufactured grids and gratings made with FRPmaterials.1.5 This specification is applicable for either SI(as Speci-fication D7957M)or inch-pound units(as SpecificationD7957).1.6 UnitsThe values s
7、tated 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
8、 be combined.1.7 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 prio
9、r to use.1.8 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 TechnicalBar
10、riers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete ReinforcementC904 Terminology Relating to Chemical-Resistant Nonme-tallic MaterialsD570 Test Method for Water Absorption of PlasticsD792 Test Methods
11、for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD2584 Test Method for Ignition Loss of Cured ReinforcedResinsD3171 Test Methods for Constituent Content of CompositeMaterialsD3878 Terminology for Composite MaterialsD7205/D7205M Test Method for Tensile Properties of Fiber
12、Reinforced Polymer Matrix Composite BarsD7617/D7617M Test Method for Transverse Shear Strengthof Fiber-reinforced Polymer Matrix Composite BarsD7705/D7705M Test Method for Alkali Resistance of FiberReinforced Polymer(FRP)Matrix Composite Bars usedin Concrete ConstructionD7913/D7913M Test Method for
13、Bond Strength of Fiber-Reinforced Polymer Matrix Composite Bars to Concreteby Pullout Testing1This specification is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.10 onComposites for Civil Structures.Current edition approved Fe
14、b.1,2022.Published March 2022.Originallyapproved in 2017.Last previous edition approved in 2017 as D7957/D7957M 17.DOI:10.1520/D7957_D7957M-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
15、 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 standardizati
16、on 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.1D7914/D7914M Test Method for Strength of Fiber Rein-forced Polymer(FRP)Bent Bars in Bend LocationsE1356 Test Method for Assignment of the Glass TransitionTemperatures by Differential Scanning CalorimetryE2160 Test Method for Heat of Reaction of ThermallyReactive Materials by Differential Scanning Ca