The floor of a renovation discounter in Vechta was heavily worn and many deep areas of damage made it uneconomical to repair individual areas. The screed was installed on a separating layer and was no longer able to withstand the load of forklift traffic, especially in areas with low layer thicknesses. The client therefore decided to completely rebuild the floor as a composite screed construction.
The old screed could be removed with relatively little effort using an excavator. The exposed bare concrete floor was shot-blasted and showed enormous differences in height.
The epoxy resin primer AB-Pox 001 from AB-Polymerchemie in Aurich was then applied. When fresh, the resin was completely sanded with quartz sand.
Due to extreme height differences in the raw concrete base, the new construction had to be carried out in strongly fluctuating layer thicknesses of 25 – 100 mm in order to compensate for the unevenness.
The flowing screed was then laid in two sections over the following two days. The cementitious binder VELOSIT SC 245 was used with a tested and washed sand with a grain size of 0 – 8 mm. VELOSIT SC 245-based screed surfaces achieve a compressive strength of 25 – 30 N/mm2 after just one day and are then already fully usable. In the formulation used, the screed achieves class CT-C50-F7.
The project presented some logistical challenges, as there were no storage areas for the binding agent and delivery in big bags was also out of the question. VELOSIT SC 245 was therefore delivered directly to the construction site in a silo train, where it was blown into the binding agent chambers of the two pump trucks from Kotan Bau GmbH. The sand chambers of the pump trucks were successively filled with a telescopic loader.
A total of 226 tons of screed based on VELOSIT SC 245 was applied in 2 days.
Shortly afterwards, a carpet was laid on the approx. 2,000 sqm area.