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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Silanes protect the roof of the Swiss Gott...

Wednesday, 30 September 2020
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Raw materials & technologies, Applications, Protective & Marine coatings

Silanes protect the roof of the Swiss Gotthard Tunnel

Tuesday, 22 June 2010

Impregnation helps against corrosion, so silane-active ingredients provide protection.

Silanes protect the concrete roof of tunnels Source: Wacker AG

Silanes protect the concrete roof of tunnels Source: Wacker AG

No matter how important water may be in the production of concrete, salt water and concrete form a lethal cocktail. When the salt is washed off winter roads and seeps deep into the pores of bridge piers, tunnel roofs and tunnel walls, danger lies ahead: dissolved chlorides in the water attack the steel inside the concrete. This corrosion can have serious consequences: crumbling concrete, accidents, and costly and lengthy renovations accompanied by congested traffic. Materials experts from Wacker have developed water-repellent specialty silanes that protect concrete for years on end by preventing salts from penetrating into concrete. Recently, the roof of the Gotthard tunnel in Switzerland was also treated with specialty silanes. Usually, the pH of concrete is high enough to protect the steel. But it is powerless against salt chlorides, which cause the pH to fall and the protection to disappear. Because corroded steel is bulkier, it presses against the concrete from the inside and forces parts of the concrete to eventually break off.

related links:

http://www.wacker.com

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