PSI - Issue 84

Irene Matteini et al. / Procedia Structural Integrity 84 (2026) 677–685

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Fig. 4. C-scan view displaying asphalt crack patterns. Image generated from the first survey in the wintertime.

Steel Reinforcement Configuration: The upper layer of the steel reinforcement of the deck was identified to include a 20 x 20 cm square mesh, followed by a deeper layer of rebars orthogonal to the bridge axis with a 60 cm spacing laying in between the two mesh layers as shown in Figure 5.

Fig. 5. A detail of a C-scan view displaying the first layer of 20 x 20 cm square mesh crossed by the orthogonal rebars at 60 cm spacing, which only appear on the side of the bridge where they are shallower as illustrated above.

It was observed that the orthogonal rebars extend only 2 meters on each side of the deck and appear located at different depths showing an irregular distribution across: they appear shallower closest to the edge of the deck as indicated in Figure 6. This pattern suggests an issue more likely related to poor workmanship during construction and concrete pouring, rather than a deliberate feature based on specific design criteria.