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Title:

NDE of Concrete Bridge Deck Delamination Using Enhanced Acoustic Method

Accession Number:

01152245

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Delamination of the concrete cover above the upper reinforcing bars is a common problem in concrete bridge decks. The delamination is typically initiated by corrosion of the upper reinforcing bars and promoted by freeze-thaw cycling and traffic loading. The detection of delamination is important for bridge maintenance and acoustic non-destructive evaluation (NDE) is widely used due to its low cost, speed, and easy implementation. In traditional acoustic approaches, the inspector sounds the surface of the deck by impacting it with a hammer or bar, or by dragging a chain, and assesses delamination by the “hollowness” of the sound. The acoustic signals are often contaminated by traffic and ambient noise at the site and the detection is highly subjective. The performance of acoustic NDE methods can be improved by employing a suitable noise-reduction algorithm and a reliable detection algorithm that eliminates subjectivity. Since the noise is non-stationary and unpredictable, the algorithms should be adaptive. In this paper, a blind source separation algorithm using a modified independent component analysis (ICA) is used to separate the sounding signals from recordings in a noisy environment. The filtered signals are then fed into a detection algorithm where mel-frequency cepstral coefficients (MFCC) are used as features for detection. The performance of the detection algorithm was validated using recordings with different signal-to-noise ratios. The results show that the proposed algorithms can significantly improve the detection accuracy, especially under highly noisy conditions.

Monograph Accession #:

01147878

Report/Paper Numbers:

10-2404

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Zhang, Gang
Harichandran, Ronald S
Ramuhalli, Pradeep

Pagination:

10p

Publication Date:

2010

Conference:

Transportation Research Board 89th Annual Meeting

Location: Washington DC, United States
Date: 2010-1-10 to 2010-1-14
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures; Photos; References (16) ; Tables (1)

Uncontrolled Terms:

Bridge maintenance

Subject Areas:

Bridges and other structures; Highways; Maintenance and Preservation; I60: Maintenance

Source Data:

Transportation Research Board Annual Meeting 2010 Paper #10-2404

Files:

TRIS, TRB

Created Date:

Jan 25 2010 11:07AM