Mineral repair system for a pumping station

After many years of service, a pumping station in the small town of Treis-Karden (Mosel) had developed significant damage due to concrete corrosion, particularly in the area of water level variation.
The urgently required repairs were carried out with the high-tech mortar ombran MHP-SP 3000 from MC, a material with the classification B2/XWW4 that satisfies the highest possible requirements applicable to coating mortars according to DIN 19573.

 

The pumping station in Treis-Karden, a small town in the district of Cochem-Zell in Rhineland-Palatinate, is owned by the local municipal authority. At the beginning of 2018, the engineering partnership Schönefeld und Briesch GmbH was given the task of inviting tenders for the necessary remediation measures in accordance with the latest regulations based on DIN 19573. The operator and the engineering firm specified the recoating of the damaged areas of the building with a high-performance mineral mortar offering exceptional chemical and mechanical resistance.

 

Highest exposure class

The decision was therefore made to use the high-tech mortar ombran MHP-SP 3000, a material offering – in particular – optimised chemical resistance and the flagship of a new generation of mineral coatings launched onto the market by MC. Its formulation is based on CEM III high-performance cements, which are key to achieving XWW4 status, the highest possible exposure class according to DIN 19573.

 

Its high chemical resistance is further enhanced by minimised porosity and optimised pore size distribution in the mortar matrix: MC's DySC® technology ensures that the mortar matrix continues to undergo compaction with ongoing solidification beyond the normal hydration process. This also produces extremely high abrasion resistance as well as resistance to sulphates and carbonation. In addition, ombran MHP-SP 3000 is able to withstand extreme temperature changes, freeze-thaw cycling and de-icing salt contamination.

Stand-out application properties

The Cologne/Bonn branch of Aarsleff Rohrsanierung GmbH was awarded the contract to refurbish the approx. 90 m2 of wall surfaces and the approx. 25 m2 of ceiling surface of the pump sump. After careful substrate pre-treatment, the flexibility and good workability of ombran MHP-SP 3000 came to the fore as the coating and reprofiling work in the pumping station proceeded: ombran MHP-SP 3000 is, like all mortars of the ombran MHP family, a "dual performance" system, so while conventional repair systems require different products for reprofiling and coating, ombran MHP-SP 3000 offers a single-product solution. The same material can be applied either by spraying or by manual trowelling. This saves time and simplifies site logistics. ombran MHP-SP 3000 also forms a very good adhesive bond with the substrate, exhibits high stability even in thick layers, and can be quickly exposed to water, enabling coated water and wastewater structures to be returned to service after a short curing time of just a few hours.

 

Thanks not least to these application attributes, the repair of the pumping station in Treis-Karden was successfully completed by Aarsleff within the scheduled refurbishment period of just five weeks and very much to the satisfaction of all parties involved.