Chimney for the Lisbjerg Biomass Plant

The building process was continuous where it was important that no construction joints were created in the cast. We therefore undertook the casting round-the-clock for thirty days. This meant that an average of three and a half metres was cast per day.

During the slip-form casting, the concrete was cast in a 1m high form, which was elevated 25 cm at a time. This meant that the concrete had six hours in the form, after which it should be sufficiently set. The calculation of the correct combination of accelerator, retarding agent and temperature took a few months, and during the actual casting, it was continuously refined.