Message Board Thread - "Concrete Bridge Deck Delamination"

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Concrete Bridge Deck Delamination jgarner 8/1/2000
Does anyone have any thermos showing concrete bridge deck delamination. I just purchased a book from ASNT on Infrastructure breakdown, but I would love to see some pictures.
Thanks,
Jim Garner
Infrared Research Inc.
1-800-866-7480
jgarner@voy.net
 
RE:Concrete Bridge Deck Delamination Gary Orlove 8/2/2000
Jim,

Here are a few references you can try. Not a lot of images however. - Gary

Infrared imaging (thermography) is a non-contact optical method where an accurate two-dimensional mapping of a steady or transient thermal effects is constructed from the measurement of infrared energy emitted by the target. Recent advances in infrared technology, specifically development of high-density imaging sensors have opened a new level of application unreachable prior to this technology. One of the methods selected for the bridge inspection is an active or transient thermography. This method is dissimilar to the conventional thermographic methods in the utilization of time-dependent heating (or cooling) of the target. Depending on the type of defect and thermal characteristics of a target, an external heating or cooling is applied in the form of the short energy pulses. The created thermal perturbation is then followed by a differential time-resolved infrared image analysis. See http://iti.acns.nwu.edu/pub...

Infrared Thermography is an effective inspection tool for detecting delaminations on exposed and overlay concrete bridge decks. This paper will describe the apparatus used, procedure, and actuary of detecting delaminations in Bridge Decks using Infrared Thermography. See http://www.civil.buffalo.ed...

A combination of thermography and the natural heating/cooling cycle allows areas of de-laminated concrete and de-bonded render to be detected. The great advantages of this technique are that it is carried out remotely and is non-destructive. See http://www.infratech.ltd.uk...

The cameras simultaneously record the images of the roadway surface and its infrared signature thus allowing to differentiate actual distress from surface features. Both cameras are linked to a positioning system accurately providing the images' location in respect to geodesic reference points. Following the survey, the referenced images are converted to a digital format with the CATS processing software. See http://www.gietech.com/engl...

This paper explores the possibility of detecting geometrical defects in concrete specimens using thermal imaging. The method is based on the characteristics of heat flow phenomenon, in a conductive medium of specific geometry, which is intended to model predetermined boundary conditions. A range of crack widths, representing mechanical damage, has been induced under controlled laboratory conditions. In all cases the cracks have been located successfully. Numerical modelling results, using finite element method, are present. The current analysis is developed as a two-dimensional problem. The numerical model may be used to confirm the experimental results, once material physical and mechanical parameters are available. Experimental data, based on selected shape parameters, show a satisfactory agreement with the numerical results, hence encouraging the scope of the present study to be widened. See http://www.ndt.net/article/...

Nondestructive Evaluation of Bridges and Highways III. See http://www.spie.org/web/abs...

Infrared thermography has the potential to size defects, to evaluate the quality of the adhesive bonds remotely and to cover a large area per scan. In this paper, a feasibility study was carried out to evaluate bonded and hollow areas between tile and concrete substrate. A locked-in thermography system was used. The study shows that there is a distinct difference in thermographic phase patterns. This is a possibility of using this technique when there is complete disbond (hollow area) between tile and concrete substrate. See http://www.mod.com.bn/edito...
 


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