The Heumarkt station construction site of the underground system in Cologne has been reinforced with an intermediate slab made from Dyckerhoff Liquidur (SVB = selbstverdichtender Beton / self-compacting concrete), which can withstand the pressure from the groundwater.
Dyckerhoff Liquidur (SVB) was the first self-compacting concrete to be approved in Germany in 2001 for both standard applications and for building precompressed reinforced cement structures in the ready-mix concrete industry.

A total of 342 loads of concrete delivered by 21 concrete mixer trucks and 4 concrete pumps were required to construct the intermediate slab. Over 4,500 tons of fine and raw crushed aggregate and over 1,700 tons of cement and additives were used in the concrete mix.
For the Heumarkt underground station construction site, 3,000 m³ of Dyckerhoff Liquidur (SVB) were delivered by the Portz, Pulheim and Wesseling-Berzdorf plants. The mix was tailor made for this project in order to meet the specific requirements.