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Proceedings Paper

Acoustic inspection of concrete bridge decks
Author(s): Mark E. Henderson; Gary N. Dion; R. Daniel Costley
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Paper Abstract

The determination of concrete integrity, especially in concrete bridge decks, is of extreme importance. Current systems for testing concrete structures are expensive, slow, or tedious. State of the art systems use ground penetrating radar, but they have inherent problems especially with ghosting and signal signature overlap. The older method of locating delaminations in bridge decks involves either tapping on the surface with a hammer or metal rod, or dragging a chain-bar across the bridge deck. Both methods require a `calibrated' ear to determine the difference between good sections and bad sections of concrete. As a consequence, the method is highly subjective, different from person to person and even day to day for a given person. In addition, archival of such data is impractical, or at least improbable, in most situations. The Diagnostic Instrumentation and Analysis Laboratory has constructed an instrument that implements the chain-drag method of concrete inspection. The system is capable of real-time analysis of recorded signals, archival of processed data, and high-speed data acquisition so that post-processing of the data is possible for either research purposes or for listening to the recorded signals.

Paper Details

Date Published: 1 February 1999
PDF: 9 pages
Proc. SPIE 3587, Nondestructive Evaluation of Bridges and Highways III, (1 February 1999); doi: 10.1117/12.339927
Show Author Affiliations
Mark E. Henderson, Diagnostic Instrumentation and Analysis Lab. (United States)
Gary N. Dion, Diagnostic Instrumentation and Analysis Lab. (United States)
R. Daniel Costley, Diagnostic Instrumentation and Analysis Lab. (United States)

Published in SPIE Proceedings Vol. 3587:
Nondestructive Evaluation of Bridges and Highways III
Steven B. Chase, Editor(s)

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