ASTM_D_7705_-_D_7705M_-_12.pdf

Designation:D7705/D7705M12Standard Test Method forAlkali Resistance of Fiber Reinforced Polymer(FRP)MatrixComposite Bars used in Concrete Construction1This standard is issued under the fixed designation D7705/D7705M;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 procedure for evaluating thealkali resistance of FRP bars used as reinforcing bars inconcrete.Alkali resistance is measured by subjecting the FRPbars to an aqueous alkali environment,with or without sus-tained tensile stress,and then testing them to failure in tensionaccording to Test Method D7205/D7205M.This standardpresents three procedures conducted at a moderately elevatedtemperature of 60C(140F),each defining different loadingconditions.The test method is also appropriate for use withlinear segments of FRP reinforcements cut from two-orthree-dimensional reinforcing grid.1.2 The values stated in either inch-pound units or SI unitsshall be regarded separately as the standard.The inch-poundunits are shown in the parenthesis.The values stated in eachsystem are not exact equivalents;therefore each system shallbe used independently of each other.Combining values fromthe two systems may result in non-conformance.1.3 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:2A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete ReinforcementC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC496/C496M Test Method for Splitting Tensile Strength ofCylindrical Concrete SpecimensC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC1260 Test Method for Potential Alkali Reactivity of Ag-gregates(Mortar-Bar Method)C1293 Test Method for Determination of Length Change ofConcrete Due to Alkali-Silica ReactionD618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD3878 Terminology for Composite MaterialsD7205/D7205M Test Method for Tensile Properties of FiberReinforced Polymer Matrix Composite BarsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE70 Test Method for pH of Aqueous Solutions With theGlass ElectrodeE456 Terminology Relating to Quality and Statistics3.Terminology3.1 Terminology in D3878 defines terms relating to high-modulus fibers and their composites.Terminology in D883defines terms relating to plastics.Terminology in E6 definesterms relating to mechanical testing.Terminology in E456defines terms relating to statistics and the selection of samplesizes.In the event of a conflict between terms,Terminology inD3878 shall have precedence over the other terminologystandards.3.2 Definitions of Terms Specific to This Standard:3.2.1 bar,na linear element,with a substantially roundcross-section,often with surface undulations or a coating ofparticles that promote mechanical interlock with concrete.3.2.2 nominal cross-sectional area,na measure of cross-sectional area of a bar,determined over at least one represen-tative length,used to calculate stress.3.2.3 representative length,nthe minimum length of a barthat contains a repeating geometric pattern that,placed end-to-end,reproduces the geometric pattern of a continuous bar(usually used in reference to bars having surface undulationsfor enhancing interlock with concrete).3.2.4 standard cross-sectional area,nthe cross-sectionalarea of a standard numbered steel concrete reinforcing bar asgiven in Specification A615/A615M,Table 1.1This test method 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 March 1,2012.Published April 2012.DOI:10.1520/D7705_D7705M-12.2For 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 3.2.5 surfaceundulation,nvariationinthearea,orientation,or shape of cross-section of a bar along its length,intended to enhance mechanical interlock between a bar andconcrete,made by any of a number of processes such as,forexample,indentation,addition of extra materials,and twisting.3.2.6 traveler,na short bar segment,sub