Drinking water tower in Austria
Hinterbrühl - Austria
In 2012, the specialist construction company MM Kanal-Rohr-Sanierung GmbH from Hartl near Kaindorf, Austria, was awarded a project by the regional water board WLV to repair and refurbish the Hinterbrühl water tower built in 1973. The work was to be carried out in accordance with a concept elaborated by the contractor. Corroding steel reinforcement meant that this single-chamber water tower with a useful capacity of 2,000 m3 was in danger of becoming structurally unstable. Only materials approved for potable water were permitted for use on the restoration project.
The regional water board decided in favour of the purely mineral product system MC-RIM-PW, which met in full the requirements of the ÖVGW (Austrian Gas and Water Association). MC-RIM PW 101 and PW 301 exhibit exceptional properties in terms of sealing performance and chemical and abrasion resistance. The coatings offer values far below the specified limits in relation to the water cement ratio for lining mortars, fresh mortar air void content and total air void content. These exceptional characteristics are the result of the DySC® technology developed by MC which causes coatings to actually improve in terms of their sealing performance and resistance after they have been applied, with overall porosity actually decreasing with usage.
High-tech in the drinking water tank
After the old coatings had been removed, the reinforcing steel was cleaned of rust and then provided with a mineral, cement-bound and potable-water-approved corrosion protection coating of MC, with gaps being refilled with the concrete replacement system MC-RIM PW 201. The first coating was then manually covered using a mineral, cement-bound and potable-water-approved bond coat of MC.
Finally, the surface protection system MC-RIM PW 101 was applied in two layers over the walls and ceiling area using wet spraying technology. The surface protection system used for the floor area, MC-RIM PW 301, was manually applied and compacted. As in the case of the walls, the surface was smoothed to provide a mirror finish.
However, the ceiling surfaces were left rough as sprayed to enable condensate to drip more easily. As a result, the main chamber of the Hinterbrühl water tower now boasts a well sealed, durable and exceptionally reliable coating system, proven around the world as one of the most advanced of its type for drinking water storage applications.