By Viktor Mechtcherine, Ulrich Schneck, Mike Grantham

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Extra resources for Concrete Solutions: Proceedings of Concrete Solutions, 4th International Conference on Concrete Repair, Dresden, Germany, 26-28 September 2011

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But this could be partially explained when the high chloride contents were found. NDT was useful to establish the extent of damage and with laboratory results helping to estimate the complexity of the rehabilitation required. The proposed repair procedures can be a guide to the contractor, who must decide the sequence for works considering structural safety as well as environmental restrictions. The contractor will also design the cathodic protection system in accordance to the patching and sealing procedure, as well as the location of the power lines towers foundations.

Later, in March 2011, the second attempt was done. This time, 2 systems, GECOR 6 and GECOR 8 were used. Improvements were tried for preparing bars, basically an exhaustive cleaning: including sanding, brushing, applying phosphoric acid (1:3), and washing with freshwater. Also, special attention was given to keeping the concrete humid as well as the sponge (contact between the concrete surface and the sensors). Measurements were done on rebars and on stirrups. Figure 6 illustrates the measurement process.

The results presented a lower risk of corrosion on stirrups than on rebars. 2 Core and concrete powder sampling Concrete coring was done on representative beams, piers (Fig. 8) and heads. This allowed us to verify concrete soundness below the surface of the structures and to obtain some information about the concrete such as the maximum size aggregate (msa) of 25 mm and particle size distribution, which was adequate, as well as mechanical properties when tested in laboratory. The core holes were refilled with commercial grout (Sikagrout).

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