Report On Prestressed Steel 6 The Influence Of Stray Electrical Currents On The Durability Of Prestressed Concrete Struct

This design guide allies basic knowledge with current engineering experience of the durability of concrete structures. It presents appropriate solutions for different environmental conditions. The complex nature of environmental effects on structures requires improved materials, as well as measures at the architectural design phase, and proper inspection and maintenance procedures.

This state of the art report summarizes the mechanisms and types of corrosion to which a ground anchorage based on a prestressing tendon can be subjected. The chemical, electrochemical and bacterial reactions between agressive soils and steel and concrete are dealt with in detail. There is a carefully recorded and analysed list of a number of known cases of tendon corrosion. A corrosion protection philosophy is proposed, with five classes of protection, with examples of such protection in current practice.