Germany: Dyckerhoff is supplying 12,000t of CEM III/A 32.5 N-LH cement to Frankfurt Airport for the production of underwater concrete. The airport is building a new terminal and the construction pit for the floor slab is deeper than the groundwater level, hence the floor slab must be concreted underwater.
The construction pit has a size of almost 66,000m² with excavation carried out in dry conditions to a depth of 5.5m to the groundwater table. Then a further 8 -11m was excavated in wet conditions using industrial divers. The excavation pit has been prepared in sections and then concreted by the divers resulting in short sections. The quantities of cement to be delivered by Dyckerhoff also fluctuate considerably, with sometimes 20 silo trucks/day leaving the Dyckerhoff plant in Wiesbaden. Deliveries started in March 2019.
Around 40,000m3 of concrete has been produced by Sehring Beton, using a mobile mixing plant directly on site. The construction work is being carried out by the Arge Ingenieurbau Baugrube T3, which consists of the two companies Adam Hörnig Bau and Bickhardt Bau.