ABSTRACT
In order to illustrate the relevance of sustainable concrete maintenance and repair, a case study of a concrete silo situated in an industrial area with corrosion damage is selected. The environmental and economic impact is determined through life cycle assessment (LCA) and life cycle cost analysis (LCCA) for six concrete repairs: (i) conventional repair, (ii) conventional repair with surface protection, (iii) galvanic cathodic protection with zinc foil, (iv) galvanic cathodic protection with zinc gauze, (v) impressed current cathodic protection with titanium gauze and (vi) impressed current cathodic protection with a conductive coating. Moreover, three different indented service life extensions are evaluated: 20, 40 and 50 years. In general, a repair with impressed current cathodic protection is indicated as the most sustainable for this case study. However, for other service life extensions (e.g. 15, 30 or 45 years) certain techniques could perform better regarding the environmental or economic impact.
