Die Betonoberfläche des Silos wurde vorgängig mittels HDW-Verfahren gestrahlt, um die geforderte Rauigkeit zu erreichen. Dies stellt eine optimale Verbindung zwischen dem Bestandsbeton und Betonersatzsystem sicher. 24 Stunden vor dem Spritzen des Mörtels erfolgte das Bewässern der Betonoberfläche, um die Kapillaren mit Wasser zu sättigen.

The concrete surface of the silo was mechanically abraded in advance to achieve the required roughness. This ensures an optimal bond between the existing concrete and the mortar reinforcement system. 24 hours before spraying the mortar, the concrete surface was watered to ensure capillary saturation.

Double mesh to combat heavy load

After watering, Stucki Bauunternehmung AG sprayed the first layer of S&P ARMO-crete^® w RQ + in a thickness of 15mm onto the matt damp substrate using the S&P ARMO Power Pump. Afterwards, the construction experts embedded the S&P ARMO-mesh^® L500 into the still fresh mortar and pressed it into the mortar with a trowel. Since the load is greatest in the lower four metres of the structure, two layers of ARMO-mesh were incorporated in this zone.

The second layer of mortar, which embeds and covers the reinforcement, was then sprayed onto the first layer, which had not yet set. When the setting process had begun, the contractors levelled the mortar to the required level with an aluminium squeegee and worked the surface with a sponge board. To prevent the mortar from drying out too quickly, it was watered, covered with plastic and cured for seven days.