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Reference
Challenging repair of an underpass in the Swiss
Switzerland
In the town of Killwangen in the Swiss canton of Aargau, a pedestrian and vehicle underpass running under the railway station had to be repaired during ongoing operations. A tried and tested system from MC for internal tunnel repair and coating helped to ensure impressive construction progress in terms of both speed and safety.
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Name
Proven MC system ensures fast and safe construction progress
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Country
Switzerland
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Fields of Expertise
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Categories
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Products
An underpass beneath the railway station in the municipality of Killwangen, around 20 km north-west of Zurich, was in need of thorough rehabilitation. The company commissioned for the work by Swiss Federal Railways (SBB) was Rothpletz Lienhard + Cie AG, headquartered in Aarau, Switzerland.
Systematic tunnel refurbishment
The repair of the pedestrian and vehicle subway included the dismantling of the walls with complete reprofiling, as well as a full repair of the tunnel ceiling. Products from MC were chosen as part of the project tender, impressing with a self-contained, tried and tested system structure involving the high-performance fine mortar Nafufill R3 FM and the ready-to-use single-component coating MC-Color T 21. The rehabilitation work began in April 2022. After 3.5 cm of the old wall coating had been removed, Nafufill KMH was used as a bond and anti-corrosion coating. The surfaces were then reprofiled with the fibre-reinforced PCC/SPCC concrete replacement Nafufill KM 250. Enormously resilient, this serves to enhance the structural strength of the substrate, as well as offering high fire resistance.
Nafufill R3 FM and MC-Color T21 – a powerful combination
The surfaces were then coated with the two-component, polymer-modified high-performance fine mortar Nafufill R3 FM – a product that can be used as a blowhole, shrinkage cavity, scratch and surface filler that also offers high resistance to carbonation plus elevated water retention capacity. And it is equally resistant to high temperatures, freeze/thaw cycling and de-icing salt. The fine mortar requires no curing treatment and therefore contributes to rapid construction progress. Nafufill R3 FM therefore proved to be the perfect problem-solver in Killwangen. In the next step, the surfaces were coated with MC-Color T 21, an innovative MC tunnel coating that is likewise highly resistant and durable. The single-component acrylate dispersion can be applied directly either by roller or airless spraying. In contrast to two-component products, the mixing, repotting and remixing usually required is no longer necessary, thus significantly reducing the amount of work involved. MC-Color T 21 could also be applied directly to the repaired surface in two coats without a bond coat and was dry to the touch after just one hour – once again resulting in savings in both labour and time.
In the final step, the ceiling of the underpass was coated with Emcephob HC, a single-component water-based hydrophobic cream, to reduce water absorption and at the same time increase resistance to freeze/thaw cycling and de-icing salt. This enabled MC to offer a safe, certified and time-saving system solution that minimised the duration of the construction project in Killwangen and allowed it to be completed as early as September 2022.
