Issue 46

F. Bazzucchi et alii, Frattura ed Integrità Strutturale, 46 (2018) 400-421; DOI: 10.3221/IGF-ESIS.46.37 409 the epoxy covering was substituted with the Emaco S88 retained shrinkage grout and an Emaco Bianco white painting (Fig. 12(b)). Images of the collapsed Tower 9 prove the presence of this protective layer, but at the same time is possible to observe a neat discontinuity between the old and the new surfaces (Fig. 12(c)). Today, the state of the art for the same intervention prescribes that the removal must occur for all the thickness of the corrupted concrete, and complete bonding has to be assured between old and new surfaces to avoid stagnation and contaminant penetration [22]. Figure 12 : Repairing of one of the tower of the Polcevera viaduct [17] (a) ; white covering of Tower 9 (b) ; ruins of Tower 9 (c) . Figure 13 : Overall view of the Akragas viaduct (a) ; deck detail (b) [23].