Proposed Test Procedure to Determine Relative Bond Value of Reinforcing Bars


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Title: Proposed Test Procedure to Determine Relative Bond Value of Reinforcing Bars

Author(s): ACI Committee 208

Publication: Journal Proceedings

Volume: 54

Issue: 8

Appears on pages(s): 89-104

Keywords: no keywords

Date: 8/1/1957

This test procedure provides a uniform basis for comparison of bond qualities of different reinforcing bars. The recommended test method uses companion beam type specimens, cast horizontally in inverted and normal positions so that the effects of water gain and settlement of concrete are included in the evaluation. The concrte surrounding the bars is in tension as bars are ordinarily used, which makes the results more acceptable to some users. Minimum criteria for acceptance are not included since the purpose is merely to establish relative bond values for the different bars under consideration. The test may be used to evaluate the effectiveness of deformed bars having characteristics other than those described in "Tentative Specifications for Minimum Requirements for the Deformation of Deformed Steel Bars for Concrete Reinforcement," ASTM A 305-56T. For construction under the ACI Building Code, an evaluation of such bars is necessary since the code definition for a deformed bar is one which meets the requirements of ASTM A 305. Manufactures of bars meeting the requirements of ASTM A 305 may use the test procedures for product improvement and to evaluate modifications in the design of deformations.