Nondestructive Testing to Identify Concrete Bridge Deck Deterioration (2012) / Chapter Skim
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34 C h a p t e r 5 High-speed NDT technologies such as ground-penetrating radar, infrared thermography, and impact echo scanning have been increasingly used in recent years for bridge deck condition assessment. Still, these technologies have not been widely adapted or accepted for two main reasons: (1)
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35 resistivity, galvanostatic pulse measurement, infrared thermography, ultrasonic pulse echo, and chain dragging and hammer sounding. Some of the technologies were represented by multiple participants, each using a different system.
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36 evaluation, and technology ranking information. Figures 5.5 to 5.11 illustrate data collection by different participants.
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37 Figure 5.7. Ground-penetrating radar: IDS.
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38 Figure 5.9. Half-cell potential (left)
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39 Figure 5.15 depicts an overview of the approximate distribution of the as-built defects in this deck. The information about each defect is summarized in Table 5.1.
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42 Figure 5.14. Fabricated slab: (a)
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43 Table 5.1. Detailed Information of Defects in Fabricated Concrete Deck Defect Type Code Size (in.)
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44 Corroded Rebar in Core: Black Corrosion (Fe3O4) C4 C3 Very Thin Delaminaon Delaminaon Thick Delaminaon C2C1 Delaminaon Figure 5.18.
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45 Figure 5.20. Cores from recovered bridge deck.
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46 Preparation for Validation Testing To facilitate testing, compacted soil shoulders and ramps were built surrounding the fabricated slab, so that the surface was vehicle accessible, as shown in Figure 5.21. Similarly, the recovered bridge deck was placed into the soil ground.
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47 Figure 5.25. Infrared thermography (left)
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