ASTM A A test methods cover the testing of mechanical splices for steel rebar reinforcing bars. Steel bar in concrete has different mechanical behavior than bar-splice in testing without concrete. ASTM test standards aim to compensate this problem through their testing method in order to get an accurate measurement of the steel strength. Through the ASTM method of testing mechanical splices for reinforcing bars, acceptable mechanical properties can be determined. Specific strain loading conditions determine splice that should be used to reinforce concrete structures. Force range of 5 kN to kN 1, lbf to , lbf Adjustable test space The most popular choice for static tension and compression tests These dual column testers are available in both tabletop and floor standing models.
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ASTM A is a testing standard that covers the testing of mechanical splices for reinforcing bars. The bar-splice assembly consists of two reinforcing bars connected with a mechanical splice and represents the mechanical splice used in practice. Results obtained from testing the bar-splice assembly can be used to determine the acceptability of the mechanical splice for use in reinforced concrete structural members under specific design criteria.
The various test methods described in this standard are applicable to any type of mechanical splice manufactured to join steel reinforcing bars of any grade, uncoated or coated.
The standard covers tension, compression, cyclic load, high-cycle fatigue, and slip tests. It is also recommended to run each test in low temperatures to ascertain the behavior of the bar-splice assembly under temperatures at the critical zone. Finally, features of one or more of the tests can be combined to run combination tests. Forgot your password? Work with us to find the right equipment for your ASTM standard. Summary of Test. Testing Procedure.
Mark the gauge length with a center punch, scribe marks or draw with ink. The distance between the gauge marks after the specimen is broken is used to determine the percent elongation at break. Zero the testing machine without the specimen inserted in the grips. Install the specimen in the grips and attach at least two axial extensometers to the specimen. Please note that the extensometer needs to be removed prior to specimen failure.
ADMET software stops test and prompts the removal of the extensometer once the total strain data has been satisfactorily obtained. Start loading the sample. The speed of testing is generally specified in one of three manners: a rate of movement of the crosshead of the testing machine when not under load; b the rate of stressing of the specimen; or c the rate of separation of the crossheads under load.
Run the test until specimen failure or fracture. Record the stress-strain behavior and the yield and tensile strength of the bar. Run the test until specimen reaches the yield strength of the bar.
Once the yield point is reached, remove the extensometers and continue test until specimen failure. Record the stress-strain behavior and elongation of the test specimen continuously. Procedure C — Monotonic Compression Test Follow the same instructions as Procedure A, above, using a compression test set up and compression platens. Deflectometers for measuring compressive strain is not required for this test.
Apply the load at a constant speed where the minimum strain rate is equal to 0. Run the test until compressive load reaches that specified. Reverse the crosshead loading direction once the specimen reaches the compressive loads specified. Apply the load at a minimum strain rate equal to 0. After reaching the yield, load the specimen at the strain rate specified. Apply the load in tension to the specified tensile strain and then in compression. Repeat this procedure until the specified number of cycles at this maximum tensile strain is completed.
Repeat this procedure for each strain group increment until all of the tension-compression cycles for all strain group increments specified have been completed. Following the last cycle, apply tensile load to failure. Then, decrease the tensile force to the lower tensile or compressive force specified. Refer to the test standard to determine the frequency of tests. Repeat this procedure until the specified number of cycles has been reached. Following cycling loading, apply tensile load to failure.
Record the zero extensometer reading over the gauge length across the splice. Then, load the bar-splice assembly in tension to a predetermined load. Unload the specimen at the same near zero load and measure and record the extensometer reading.
Record the difference between the extensometer readings at near zero under load under step 1 and step 3 as the slip within the bar-splice assembly.
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The various tests herein described can be specified in total or individually. Note 1—Various code-writing bodies specify various parameters, such as test loads, number of cycles and test temperature, for testing. Within the text, the inch-pound units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Standard Test Methods for Testing Mechanical Splices for Steel Reinforcing Bars
ASTM A is a testing standard that covers the testing of mechanical splices for reinforcing bars. The bar-splice assembly consists of two reinforcing bars connected with a mechanical splice and represents the mechanical splice used in practice. Results obtained from testing the bar-splice assembly can be used to determine the acceptability of the mechanical splice for use in reinforced concrete structural members under specific design criteria. The various test methods described in this standard are applicable to any type of mechanical splice manufactured to join steel reinforcing bars of any grade, uncoated or coated.