The Role of Corrosion Inhibitors in Maintaining Concrete Durability; 15 Years Experience in New Zealand and around the World
The last thirty years have seen a growing demand for increased durability of concrete repairs. This period has seen improvements in the understanding of the causes of concrete deterioration, improvements in concrete repair products and in repair specifications (Tanner et al, 2012). The period has also seen development of advanced rehabilitation and protection methods such as corrosion inhibitors. Corrosion inhibitors for the construction industry were first developed in the 1950’s and a considerable volume of research has been undertaken by academic institutions and industry to quantify their effectiveness and limitations. This paper reviews some of these studies and the performance of repairs on the Scarborough Clock Tower near Christchurch. It concludes that corrosion inhibitors can be a good approach to adopt for providing cost effective improvements in concrete durability for concrete suffering from chloride and carbonation induced reinforcement corrosion.