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ASTM A1034 - A 1034M - 10a (2015).pdf

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ASTM A1034 - A 1034M - 10a (2015).pdf

Designation A1034/A1034M − 10a Reapproved 2015Standard Test Methods forTesting Mechanical Splices for Steel Reinforcing Bars1This standard is issued under the fixed designation A1034/A1034M; 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 These test methods cover the testing of mechanicalsplices for reinforcing bars. The various tests herein describedcan be specified in total or individually.1.2 The test methods herein described are applicable to anytype of mechanical splice manufactured to join steel reinforc-ing bars of any grade specified minimum yield strength,uncoated or coated.1.3 This standard describes only the methods for testingmechanical splices for steel reinforcing bars, but does notquantify the parameters for testing nor acceptance criteria,which must be specified.NOTE 1Various code-writing bodies specify various parameters, suchas test loads, number of cycles and test temperature, for testing.1.4 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.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsE4 Practices for Force Verification of Testing MachinesE8 Test Methods for Tension Testing of Metallic MaterialsE9 Test Methods of Compression Testing of Metallic Mate-rials at Room TemperatureE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE83 Practice for Verification and Classification of Exten-someter SystemsE466 Practice for Conducting Force Controlled ConstantAmplitude Axial Fatigue Tests of Metallic MaterialsE467 Practice for Verification of Constant Amplitude Dy-namic Forces in an Axial Fatigue Testing System3. Terminology3.1 Definitions of Terms Specific to This Standard3.1.1 bar-splice assemblyan assembled specimen consist-ing of two reinforcing bars connected with a mechanical splice.3.1.2 clip gagean electrical device used to measure smalldisplacements in test specimens whose voltage output isconvertible into strain.3.1.3 couplerthreaded device for joining reinforcing barsfor the purpose of providing transfer of either axial compres-sion or axial tension or both from one bar to the other.3.1.4 coupling sleevenon-threaded device for joining re-inforcing bars for the purpose of providing transfer of eitheraxial compression or axial tension or both from one bar to theother.3.1.5 data acquisition systema computer based data log-ging system to record the output of electrical transducersreporting load, strain or displacement.3.1.6 differential elongationthe difference between thetotal movement measured on the splice specimen from zeroload to a predetermined test load and the total movementmeasured on an unspliced bar specimen under the samepredetermined load.3.1.7 linear variable differential transformer LVDTanelectrical device used to measure displacements, whose voltageoutput is convertible into strain.3.1.8 mechanical splicethe complete assembly of a cou-pler or a coupling sleeve and possibly additional interveningmaterial or other components to accomplish the splicing of tworeinforcing bars.3.1.9 slipthe difference in extensometer readings over thegage length across the splice, measured at an initial nominal1These test methods are under the jurisdiction of ASTM Committee A01 onSteel, Stainless Steel and Related Alloys and are the direct responsibility ofSubcommittee A01.05 on Steel Reinforcement.Current edition approved Dec. 1, 2015. Published December 2015. Originallyapproved in 2004. Last previous edition approved in 2010 as A1034/A1034M – 10a.DOI 10.1520/A1034_A1034M-10AR15.2For 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 standard’s Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1zero load and, after having loaded the bar-splice assembly to atest load and unloaded it again, at the same nominal zero load.3.1.10 splice componentsall components that make up amechanical splice for reinforcing bars, including coupler,coupling sleeve, locknuts, bolts, grout, epoxy, ferrous fillermetal and/or other components.4. Summary of Test Method4.1 Various test methods are used to determine the perfor-mance of a mechanical splice under loading.4.1.1 Monotonic Tension TestThis test measures the per-formance of the bar-splice assembly under an increasingtension load. The specimen is placed in the testing machine andpulled to failure.NOTE 2Testing of specimens in tension to failure should be ap-proached with caution. Some types of mechanical splices may shatterwhile failing in tension.4.1.2 Monotonic Compression TestThis test is used toascertain the performance of the bar-splice assembly under anincreasing compressive load. The specimen is placed in thetesting machine and is loaded in compression until failure or aspecified load is applied.NOTE 3Typical maximum compressive load imposed in this test is125 of the specified yield strength of the reinforcing bar. Testing ofspecimens in compression should be approached with caution. Thebuckling load predicted by Euler Column formula may be less than thecompression load specified.4.1.3 Cyclic Load TestThis test is used to ascertain howthe bar-splice assembly performs when the specimen is sub-jected to alternating tension and compression cycles. Thespecimen is placed in the testing machine and is loaded intension, then in compression until the specified number ofcycles is reached. Each cycle may exceed the yield strain of thebar and is intended to simulate the demands of earthquakeloading on the specimen.4.1.4 High-Cycle Fatigue TestThis test is conducted withalternating tension load cycles or alternating tension to com-press load cycles, with the load staying below the yieldstrength of the reinforcing bar. This test is conducted untilfailure or a specified number of cycles are reached andsimulates the demands on mechanical splices placed in bridgesor other structures subjected to frequent elastic load cycles.4.1.5 Slip TestThis test is used to ascertain the plasticmovement slip between reinforcing bars within the bar-sliceassembly, when loaded in tension.4.1.6 Low-Temperature TestThis test is run using the testmethods described in 4.1.1 through 4.1.5, to ascertain thebehavior of the bar-splice assembly under low temperatures.4.1.7 Combination TestsFeatures of one or more of thetest methods described in 4.1.1 through 4.1.6 can be combined.5. Significance and Use5.1 Significance5.1.1 The bar-splice assembly test specimen shall closelyrepresent the mechanical splice used in practice. The behaviorof the bar-splice assembly embedded in concrete, however,may differ from its behavior during testing where it is notembedded in concrete.5.2 Usefulness5.2.1 Testing of mechanical splices for reinforcing bars shallestablish the behavior of the bar-splice assembly under theloading conditions described herein for the various test meth-ods to determine the acceptability of the mechanical splice foruse in reinforced concrete structural members under specificdesign criteria.5.3 Interpretation of Test Results5.3.1 Similar or better performance of mechanical splicesinstalled in structural members shall be expected only ifmaterials and methods of assembly are similar to the materialsand methods used in the tests.6. Apparatus6.1 Equipment6.1.1 Asuitable testing machine or load frame shall be used.The test apparatus shall have sufficient capacity to preventyielding of its components and shall ensure that the appliedtension loads or compression loads or both remain parallel tothe axis of the test specimen during testing. The equipmentshall be capable of applying cyclic loads within the timeperiods specified herein for the individual tests.6.2 Load Measurements6.2.1 The load in the specimen shall be measured by loadcell or other external load measuring method. The load cellshall be capable of providing electronic output of load mea-surements and sending to a data acquisition system for laterdata reduction. If a data acquisition system is used, it shall becapable of recording at least one measurement per second.Strain gages or other instrumentation that may be damaged orlose accuracy when the bar yields shall not be used to measureforce.6.2.2 It shall be permissible to mark bars and couplers orcoupling sleeves with punch marks, or other legible scribe orstylus markings for measuring elongation at post yield rupture.6.2.3 The loading systems shall be calibrated in accordancewith Practices E4.6.3 Elongation Measurements6.3.1 The displacements of the reinforcing bar ends withinthe coupler or coupling sleeve, as well as elastic and plasticdeformations in the reinforcing bar and coupler or couplingsleeve materials, shall be measured, if required, using amechanical extensometer or an LVDT, clip gage or otherelectronic means. The equipment need only be capable ofmeasuring the sum of all displacements and elongations. Theelongation measuring devices shall be at least of Class C, inaccordance with Practice E83.6.3.2 The motion of the testing machine grips or cross headshall not be used for determining specimen elongation.6.4 Compression Test Measurements6.4.1 Unless otherwise specified, it shall not be required tomonitor strain in monotonic compression tests.NOTE 4Only the compressive strength of the test specimen is ofinterest for evaluating a mechanical splice in compression and not thestrain.A1034/A1034M − 10a 201527. Materials7.1 Steel Reinforcing Bars7.1.1 The minimum yield strength grade of the reinforcingbars shall be specified. The pattern and the dimensional aspectsof the reinforcing bar deformations shall be representative ofthe bars used in practice.7.2 Splice Components7.2.1 The couplers or coupling sleeves and any othercomponents needed for the proper functioning of the mechani-cal splice shall correspond to the size and specified minimumyield strength grade of the reinforcing bars tested.7.3 Mechanical properties of the splice components used inthe test shall be documented prior to testing of the bar-spliceassembly. Certified mill test reports shall be considered ad-equate proof of these properties. Properties to be documentedfor these components shall include the yield and tensilestrength, as well as the ultimate elongation. For componentsmade by forging or casting, a chemical analysis and hardnesstests shall be considered to be sufficient.8. Sampling and Test Specimens8.1 Sampling8.1.1 The samples for one series of tests of the reinforcingbars, as well as the mechanical splice components, shall beselected from the same respective heat of steel.NOTE 5Using samples from the same respective heat permits animproved statistical evaluation of the test results.8.1.2 Testing of mechanical splices from different heats ofsteel shall be permitted, unless otherwise specified.8.1.3 The reinforcing bar segments within a test specimenshall be nominally of equal length and shall be clean and freeof surface imperfections that would cause the sample to fail toconform to either the specified tensile or the specified bendingrequirements.8.1.4 The heat numbers, mill certificates and essential di-mensions of all splice components used in the test shall bedocumented.8.2 Specimen Length8.2.1 The length of the reinforcing bar segment for tensionand cyclic load tests shall be chosen such that there is sufficientspace in between the cross beams of the testing machine andeither side of the coupler or coupling sleeve to allow theattachment of the elongation measuring device at a distanceequal to one to three bar diameters from the coupler orcoupling sleeve on each side, plus sufficient clearance andgripping length.8.2.2 The length of compression test specimens shall besuch that the distance between the ends of the coupler orcoupling sleeve and the grips does not exceed one bar diameter.8.3 Specimen Preparation8.3.1 The test specimens shall be prepared following thesplice manufacturer’s recommendations for the type of steel,minimum yield strength grade and size of the reinforcing bar,for which the mechanical splice is being tested.NOTE 6Construction project conditions that may affect the perfor-mance of certain types of mechanical splices include the position of thesplice during assembly vertical, diagonal or horizontal position,temperature, humidity, degree of rusting on the reinforcing bar, and barend preparation.8.3.2 The mechanical splice shall be installed on the barends in accordance with the splice manufacturer’s recommen-dations and safety instructions. The amount of torque or othermeans for installing the splice shall be measured and recorded.8.3.3 Mechanical splices where grout or other cementitiousor epoxy material is used to secure the reinforcing bars withinthe splice shall be prepared in conformance with the splicemanufacturer’s requirements. Curing of the grout material shallbe conducted in conformance with the splice manufacturer’srequirements.9. Conditioning9.1 When low-temperature testing is required, the splicespecimens shall be cold soaked for a minimum of 24 h prior totesting at a temperature equal to or less than the temperaturespecified for this test.NOTE 7Some Building Codes require such testing on mechanicalsplices.10. Test Procedures10.1 Test Set-up10.1.1 The test specimen shall be placed into the testingmachine such that tension and/or compression loads can beapplied axially and without any eccentricity. The ends of thespecimen shall be held in the test machine such that tensionloads or compression loads or both can be applied to thespecimen without movement of the specimen within the gripsof the test apparatus.10.1.2 Suitable means for avoiding buckling of the testspecimen under compression loads shall be employed.10.1.3 At least two elongation measuring devicesextensometers, that continuously monitor elongation, equallyspaced around the test specimen, shall be attached to thereinforcing bars next to the coupler or coupling sleeve such thatthe resulting total gage lengt

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