Concrete made from blast furnace slag cement with a high proportion of granulated blast furnace slag ensures the stability and durability of the telecommunications tower in Düsseldorf.
“Porous asphalt” designed for noise reduction
Rheinkniebrücke in Düsseldorf, Germany
Steel slag asphalt used on heavily trafficked road


The steel industry produces not only metal, but also a by-products which has been successfully used in many construction or agriculture applications. Nowadays, about 87 wt% of ferrous slag produced in Europe is used for building purposes. Using slag instead of natural materials is a sustainable alternative with high durability in several applications.

Slag is...

 … proven over centuries. From the beginning of the Iron Age, 800 B.C., through the invention of the blast furnace process in the 18th century, slag products have been successfully marketed and put to beneficial use.

 ... ecological and intelligent.  With various techniques for further processing, slag is prepared for a wide range of applications - as building materials or fertilisers. Through recycling, a portion of the steel slag is reused in the blast furnace as calcium and iron bearing material.

 ... for roads. Slag is exceptionally well suited for road construction: as porous asphalt and as other construction materials with positive characteristics like durability and high skid resistance.

 ... for bridges. Slag is used for demanding construction projects such as bridges and skyscrapers.

 ... for waterways. In hydraulic engineering – such as in building locks, river bottoms and bank reinforcements – slag is a proven material.

 ... as fertiliser. Slag products have been successfully used as fertilisers for generations.

 The use of slag is ecologically sound and economically smart.