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A feasibility study of detecting reinforcing-bar debonding by acoustic-emission technique

Paper presents the results of an experimental investigation to establish a quantitative correlation between acoustic-emission signatures and breakdown of the bond between reinforcing bars and concrete

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Abstract

Acoustic emissions (AE) detected by two transducers mounted on a reinforcing bar in a reinforced-concrete block, which is subjected to cyclic tension-compression loading, are used to assess the locations of re-bar debonding. Preliminary uniaxial-tension tests of the re-bar were conducted to establish the proper level of AE sensitivity which was then verified by uniaxial-tension tests of re-bar embedded in a concrete block. The main tests consist of simulated beamcolumn connection with a 90-deg hooked No. 8 Grade 60 rebar subjected to various cyclic-loading histories. Reasonably good correlations were established between the debonding regions indicated by the AE signals and those detached by dye injected into the cracked concrete.

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Authors and Affiliations

  1. University of Washington, 98195, Seattle, WA

    A. S. Kobayashi (Professor), N. M. Hawkins (Professor), Y-L A. Chan (Graduate Student) & I-J Lin (Graduate Student)

Authors
  1. A. S. Kobayashi
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  2. N. M. Hawkins
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  3. Y-L A. Chan
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  4. I-J Lin
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Kobayashi, A.S., Hawkins, N.M., Chan, YL.A. et al. A feasibility study of detecting reinforcing-bar debonding by acoustic-emission technique. Experimental Mechanics 20, 301–308 (1980). https://doi.org/10.1007/BF02328623

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  • DOI: https://doi.org/10.1007/BF02328623

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