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 of 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® product 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 seawater – for example, to reduce permeability and to resist chloride ingress. 

Other iconic marine concrete infrastructure where Elkem MICROSILICA® product 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.