Nondestructive Testing to Identify Concrete Bridge Deck Deterioration (2012) / Chapter Skim
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29 C h a p t e r 4 In Chapter 3, all promising NDT techniques for bridge deck evaluation were summarized and described in terms of their principles of operation and their applications in the detection and characterization of certain defects. Limitations of the technologies were also described.
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30 factors are compared in the same table to the average weights provided by five DOT bridge engineers. The two groups similarly identify delamination and corrosion of primary significance and vertical cracking and concrete degradation evaluation of secondary significance.
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31 Table 4.2. Definitions of Performance Measures for Different Deterioration Types Performance Measure Delamination Corrosion Cracking Concrete Deterioration Accuracy • Estimation of boundaries (extent)
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32 Table 4.3. Definitions of Performance Parameters and Corresponding Grades (continued)
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33 Table 4.4. Overall Value and Ranking of NDT Technologies Delamination Corrosion Cracking Concrete Deterioration Deterioration Type WF21 5 0.42 WF22 5 0.35 WF23 5 0.10 WF24 5 0.13 Overall Value Ranking Impact echo 4.7 1.0 2.5 3.1 3.0 1 Ultrasonic pulse echo 3.6 1.0 2.6 3.4 2.6 1 Half-cell potential 1.0 4.9 0.0 1.0 2.3 2 Impulse response 3.6 1.0 0.0 2.6 2.2 2 Ultrasonic surface waves 2.5 1.0 3.0 3.4 2.2 2 Ground-penetrating radar 3.0 1.0 1.0 3.1 2.1 2 Chain dragging/hammer sounding 3.7 1.0 0.0 1.0 2.1 2 Electrical resistivity 1.0 3.9 0.0 1.0 1.9 3 Infrared thermography 3.2 1.0 0.0 1.0 1.8 3 Galvanostatic pulse measurement 1.0 3.0 0.0 1.0 1.6 3 Visual inspection 1.0 1.0 3.7 1.0 1.3 3 Microwave moisture technique 0.0 1.0 1.0 1.0 0.6 4 Chloride concentration 0.0 1.0 0.0 1.0 0.5 4 Eddy current 0.0 1.0 1.0 0.0 0.5 4 Note: Shaded areas indicate higher performance of the technology in detection and characterization of a particular deterioration type.
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