Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

Freyssinet: corrosion free suspension cables


A NEW technique to combat corrosion in suspension bridge cables to rival dehumidification won the Vinci Innovation Awards Grand Prize last month The technique, known as the Cohestrands system, involves enclosing bundles of seven wires in a continuous polyethylene sheath which prevents water ingress.

Suspension cable corrosion is caused by water trapped during cable spinning or by water entering through cracks in paintwork.

Since the Cohestrands system is manufactured under factory conditions, it is claimed moisture cannot enter during cable spinning.

The system was invented by cable specialist Freyssinet.

Company technical director Benoît Lecinq said that it was the only product on the market to rival dehumidification.

Dehumidification is used on modern suspension bridges where dry air is pumped through cables to remove moisture. It is being considered as a way of tackling corrosion on the UK's Forth Road Bridge (see feature page 9).

Freyssinet has tested Cohestrand for moisture ingress and robustness in the field and under laboratory conditions.

Last summer it supplied cables for the first Cohestrand structure - the Kanne Road Bridge in Belgium. The cables will be checked in summer 2006 for water ingress.

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Please note comments made online may also be published in the print edition of New Civil Engineer. Links may be included in your comments but HTML is not permitted.