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Using infrared thermal imaging technology to evaluate the service condition of concrete pavement

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Document pages: 8 pages

Abstract: Infrared thermal imaging (IRT) is an effective nondestructive testing method for preliminary evaluation of concrete pavement surface and near surface in a time-dependent manner. This paper studies the influence of the internal delamination depth of concrete pavement on the detection of bridge deck by infrared thermal imaging technology. To simulate underground delamination, two polystyrene foam cubes were inserted at different depths near the concrete cylinder surface. After heating the sample, the infrared thermal imager is used to take thermal images from the surface to evaluate the influence of subsurface defects on the detection sensitivity and accuracy. We also studied the perception accuracy of the shape and size of underground anomalies using an uncooled thermal camera. To achieve this goal, we used image processing technique to accurately compute the size of delamination in order to compare it with the actual size. In addition, distance thermal graph is used to detect the presence of the defect underneath the concrete surface. Furthermore, thermal transfer modeling was adopted in this paper to assist the setup of this experiment and the results are compared with laboratory findings.

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