Estimation of chloride threshold values after 20 years’ field exposure in Swedish marine environment

Paper in proceeding, 2014

This paper presents the results from two research projects dealing with reinforcement corrosion measurements in concrete exposed to Swedish marine environment after exposure up to over 20 years. In the beginning of the 1990s, some 40 types of concrete slabs were exposed to seawater at the Träslövsläge field site on the west coast of Sweden. In this study the corrosion conditions of the rebars embedded in the concrete slabs were measured after 13 and 20 years’ field exposure using a non-destructive method. A destructive visual examination was also carried out to confirm the results from the non-destructive method. The results make it reasonable to assume a chloride threshold value of at least 1% by weight of binder for initiation of corrosion of reinforcement steel embedded in the marine concrete structures.