ASTM_A_1096_-_A_1096M_-_15.pdf

Designation:A1096/A1096M15Standard Test Method forEvaluating Bond of Individual Steel Wire,Indented or Plain,for Concrete Reinforcement1This standard is issued under the fixed designation A1096/A1096M;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 describes procedures for evaluatingbond of individual steel wire,indented or plain,for concretereinforcement.The bond determined by this test method isstated as the tensile force needed to pull the wire through thecured mortar in a cylindrical steel casing.1.2 The result of the test is the maximum tensile forcemeasured on the loaded end of the wire recorded at a free-endslip less than or equal to 0.10 in.2.5 mm.1.3 UnitsThe values stated in either inch-pound units orSI units are to be regarded separately as standard.Within thetext,the SI units are shown in brackets.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:2A421/A421M Specification for Stress-Relieved Steel Wirefor Prestressed ConcreteA881/A881M Specification for Steel Wire,Indented,Low-Relaxation for Prestressed ConcreteC109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C150/C150M Specification for Portland CementC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC778 Specification for Standard Sand3.Terminology3.1 Definitions:3.1.1 bond,nlongitudinal components of adhesion,friction,and mechanical interlock between wire and mortar orconcrete.3.1.2 bond breaker,nproduct wrapped around wire toprevent wire-to-mortar bond over a certain length.3.1.2.1 DiscussionDuct tape is commonly used for thispurpose.3.1.3 mortar,nmixture of cement,fine aggregate,andwater.3.1.4 test specimen,nassembly consisting of one steelcasing,one sample of wire,and mortar.4.Summary of Test Method4.1 Six samples of 0.2 0.3 in.5 8 mm diameter(seeNote 1)steel wire are selected from a single continuous lengthfor testing.Each wire sample is cast into a steel casing with abonded length of 6 in.150 mm.4.2 Amortar mixture,including the fine aggregate source,isprescribed,but the cement source is not.4.3 Testing of the six specimens begins shortly after themortar-cube compressive strength reaches 4500 psi 31.0 MPaand ends before the strength reaches 5000 psi 34.5 MPa.Aspecified,force-controlled loading rate is applied at the bottomof the wire while the applied load and free-end slip at theopposite(top)end is continuously monitored and recorded.The maximum pullout force occurring at an end slip less thanor equal to 0.10 in.2.5 mm is recorded as the“test result.”One complete test is comprised of the average of these sixspecimens.NOTE1This test method was developed specifically to correlatepullout values with transfer lengths for 0.208 in.5.28 mm diameter steelwire conforming to Specification A881/A881M for prestressed concrete1This test method is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel Reinforcement.Current edition approved Dec.1,2015.Published January 2016.DOI:10.1520/A1096_A1096M-15.2For 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 railroad ties but may be modified or adapted to accommodate smaller orlarger wire sizes and in prestressing or other non-prestressed concretereinforcement applications.5.Significance and Use5.1 Steel wire for concrete reinforcement is used in variousapplications wherein the wire is expected to transfer passive orprestressing forces to the structural member via the bond of theexposed wire surfaces to the surrounding concrete.5.2 Wire manufacturing processes,subsequent handling,and storage conditions can influence the wire bond.5.3 Steel wire for concrete reinforcement is used in con-struction applications with a variety of concrete mixtures.Developing tes