The bridge in Wroclaw, Poland, is a steel construction with short spans but substantial deflections and vibrations. A completely new pavement was laid in 1997. It consisted of an asphalt mastic protection layer (2 cm) and two 0/8 mm SMA layers—the first one as an intermediate layer and the second one as a wearing course. The mastic layer was spread manually, whereas both SMA courses were
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(a) (b)
FIGURE 13.2 The bridges in Plock and Wroclaw: (a) condition of the Plock bridge pavement; (b) condition of the Wroclaw bridge pavement. (Photos courtesy of Krzysztof BlaZejowski.) |
laid mechanically. An SBS modified binder—with 50/80 Pen@25°C, SP > 53°C, and ER > 50%—was used in all the asphalt layers. The condition of the pavement after 13 years in operation was still good, with no cracks or potholes (Figure 13.2.b). Slight rutting was observed (the bridge is located at the approach to a crossing with traffic lights), but repair was needed only in the area of the joints.
