Comparison of NDT Methods for Assessment of a Concrete Bridge Deck
Publication: Journal of Engineering Mechanics
Volume 139, Issue 3
Abstract
The field application of three different nondestructive tests (NDTs)—air-coupled impact echo (IE), infrared (IR) thermography, and sounding (chain drag)—are evaluated in this paper, where an actual in-service concrete bridge deck is tested. Two different contactless IE test equipment sets are deployed as part of an effort to develop new rapid measurement methods. The IE data are presented as two-dimensional frequency maps, and the IR data are presented as temperature maps over the tested area. Sounding (chain-drag) result maps are also presented. For verification of the location of near-surface delamination damage, eight drilled core samples were extracted from the test area. The results obtained from each of the individual NDT methods show reasonably good agreement with the drilled cores in terms of locating near-surface delamination. Finally, the NDT methods are compared across general performance criteria, considering accuracy, testing practicality, and costs. The analysis shows that all of the evaluated NDT methods are comparable, and the chain-drag method is not more accurate and reliable for detection of shallow delamination in the deck.
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Acknowledgments
The authors acknowledge Dr. Kerry Hall and Mr. Suyun Ham for their valuable assistance with the experiments. Also, the authors are grateful for the support and access to the bridge deck provided through the SHRP II project program under the direction of Dr. Nenad Gucunski from Rutgers University.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 139 • Issue 3 • March 2013
Pages: 305 - 314
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 31, 2011
Accepted: Mar 26, 2012
Published online: Mar 28, 2012
Published in print: Mar 1, 2013
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