ABSTRACT
A vast number of concrete buildings utilizing newly developed prefabrication techniques were built from 1960 to1979. Since then, the durability properties of the concrete building stock from this era have been found to be poor in regard to freeze-thaw action and the corrosion of the reinforcement. This building stock has now reached an age when many of the building components are due to be renovated. Because of the huge volume of this building stock, its renovation is also challenging in terms of resources. This paper combined in-depth studies on the propagation and effects of reinforcement corrosion with discussion on the different strategies of the maintenance of these structures. Protective renovation options usually perform best when applied in the initiation phase whereas delaying intervention will force the use of repair/renew options. Furthermore, if the corrosion propagation phase is included in the service life of the structure to some extent it already forces the use of heavier repairs.
