Location

La Jolla, CA

Start Date

1-1-1993 12:00 AM

Description

The recently developed impact-echo (IE) method, which utilizes an impact and subsequent displacement monitoring of the concrete surface, appears promising for the inspection of concrete structures. IE has been shown to be particularly suitable for void, delamination, and cracking detection in hardened concrete structures including bridge decks since deep penetration into the structure and one-sided accessibility are obtained. For this method to be reliable, however, accurate measurements of peak frequencies in the magnitude spectrum of the frequency domain must be made. In addition, the interpretation of confusing spectrums may be required. The first part of this paper reviews the existing impact echo technique, including typical signal generation and capture possibilities as well as the accepted signal processing. Next, an alternative approach to signal processing is developed; this approach is based on a brief literature review and laboratory experiments. It is proposed that this approach, based on the spacing of peaks in the magnitude spectrum may reduce the uncertainty of impact echo signal analysis.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12B

Chapter

Chapter 8: Civil Structures and Materials

Pages

2223-2230

DOI

10.1007/978-1-4615-2848-7_283

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

A New Approach for the Analysis of Impact-Echo Data

La Jolla, CA

The recently developed impact-echo (IE) method, which utilizes an impact and subsequent displacement monitoring of the concrete surface, appears promising for the inspection of concrete structures. IE has been shown to be particularly suitable for void, delamination, and cracking detection in hardened concrete structures including bridge decks since deep penetration into the structure and one-sided accessibility are obtained. For this method to be reliable, however, accurate measurements of peak frequencies in the magnitude spectrum of the frequency domain must be made. In addition, the interpretation of confusing spectrums may be required. The first part of this paper reviews the existing impact echo technique, including typical signal generation and capture possibilities as well as the accepted signal processing. Next, an alternative approach to signal processing is developed; this approach is based on a brief literature review and laboratory experiments. It is proposed that this approach, based on the spacing of peaks in the magnitude spectrum may reduce the uncertainty of impact echo signal analysis.