Cathodic protection of steel in concrete-experience and overview of 30 years application

This paper presents an overview of 30 years' experience with cathodic protection of steel in concrete in The Netherlands. Principles and practical aspects of CP and its design and installation are presented. Three phases have passed from the late 1980s until present: pioneering, development and maturity. In the first period CP was mainly applied...

Electro active repair of concrete for improved durability of conventional repair

Chloride induced reinforcement corrosion is increasing due to aging of concrete infra structure. Conventional repairs have poor durability and many fail after less than 10 years. For conven tional repair chloride contaminated concrete is removed, steel is cleaned and new concrete is applied. Leaving chiorides, eg. in pits, corrosion may re...

Lithium migration on mortar specimens with embedded cathode

Alkali-Silica Reaction (ASR) is a durability problem that affects numerous concrete structures woridwide. As the reaction progresses. it might lead to deleterious expansion and cracking. The addition of lithium into fresh concrete is already acknowledged as a preventive method. In existing structures, however, lithium would need to be driven...

Application of cathodic protection on 30 concrete bridges with pre-stressing steel: Remaining service life extended with more than 20 years

In view of long term maintenance of its infrastructure facilities the Dutch Highway Administration (Rijkswaterstaat) has repaired over 1.500 heads of prestressed beams and provided them with cathodic protection (CP). The heads of these beams showed moderate to severe damage due to rein forcement corrosion caused by the penetration of chiorides...