Advancements and New Applications in Impact-Echo Testing

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Title: Advancements and New Applications in Impact-Echo Testing

Author(s): M. Sansalone, Y. Lin, D. Pratt, and C. C. Cheng

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 135-151

Keywords: artificial intelligence; beams (supports); columns; (supports) impact tests; instruments; nondestructive tests; voids; General

Date: 11/1/1991

Abstract:
This paper summarizes recent developments in the impact-echo technique for locating defects in concrete structures. First, the impact-echo principle is reviewed and frequency analysis of impact-echo signals is explained for those unfamiliar with the technique. Advancements in signal processing that have been aimed at simplifying and automating data interpretation are discussed, and examples from the use of an artificial-intelligence technique for automated interpretation of signals from plate-like structures are shown. Impact-echo instrumentation is reviewed and an impact-echo field system is described. The newest application for the method is testing bar-like structures, such as columns and beams. Numerical and experimental controlled-flaw studies established the basis for the use of impact-echo for this application. Representative results obtained from impact-echo studies carried out on reinforced concrete columns with circular and rectangular cross sections are presented. Finally, an overview of ongoing research is presented.