Marine Concrete Durability - Case Study

The world’s longest sea link – Zhuhai to Hong Kong and Macau – has a combined bridge and tunnel length of 55km.  The sea link comprises three cable-stayed bridges, one 6.7 km tunnel and two artificial islands.

Inaugurated by President Xi Jinping in 2018 and with a total construction cost around US$20 billion, this mega construction project is one of the largest projects Elkem has supplied in China.

During the 2009 to 2017 construction period, more than 20,000 tonnes of Elkem Microsilica® was supplied to the project and used in high performance concrete mixtures, helping to achieve the specified service life of 120 years.

Microsilica is regularly specified for marine concrete structures, to prevent damage from sea water – for example to reduce permeability and to resist chloride ingress. 

Other iconic marine concrete infrastructure where Elkem Microsilica® has been incorporated in the concrete mixture to increase durability includes the Bandra – Worli Sea Link in Mumbai, the East Sea Bridge in Shanghai and the Øresund Bridge linking Denmark and Sweden.