Concrete restoration of the villa Deilmann in Ahlen

Restoration of the exterior façades of a private villa in Ahlen, cast in board formwork.

Location:

Ahlen

Object:

Villa

Architect:

Harald Deilmann; refurbishment under the direction of the architectural firm C. Tripp
Villa Deilmann, named after its architect Harald Deilmann, is located in Ahlen, Westphalia, and currently houses a residential community for young people. The building from the 1960s is characterised by concrete façades with a boarded structure. Numerous damaged areas, some of them extensive, were restored. The damaged areas were exclusively losses of the original concrete substance, which were caused by corroding reinforcing irons. Prior to the restoration, investigations were carried out into the condition of the building fabric and the building material. In addition, extensive percussion tests were carried out and a detailed damage mapping was recorded. Since the roof covering of the building does not protect the façades against rain, a hydrophobic coating was applied as a preventive measure after the restoration work.
Detailed picture of the underside of a balcony
Detailed picture of the underside of a balcony. Due to a low concrete cover and at the same time unfavourable water flow, the reinforcement bars corroded strongly. The resulting increase in volume exerted constant pressure on the concrete substance until it spalled off.
After treatment of the reinforcing bars, the defect was rebuilt in several layers, reprofiled and adapted to the surroundings.
After the preparation of the excavation site and the treatment of reinforcing irons, the defect was rebuilt in several layers, reprofiled and adapted to the surroundings. Water drainage was improved by adding a drip edge.
The removal of an external staircase left a gap in the façade on the first floor, which was unceremoniously filled in by an outside company. There is no active damage here, but the area is nevertheless a considerable blemish in the façade.
The brick-lined area was worked back slightly to make room for an addition including light reinforcement.
The brick-lined area was worked back slightly to make room for an addition including light reinforcement. The concrete surface was then perfectly imitated in colour and structure.
Detailed photo of a damaged area during treatment.
Detailed photo of a damaged area during treatment. The irons have already been treated, the defect has been presented with a mineral, highly alkaline mortar. The still missing top layer is part of the modular system in which the different materials used were matched to each other.
Small deviations could be optimised by selective retouching.
The aggregates of the last mortar layer (top layer) were chosen in such a way that the supplementary mass also visually matches the original substance. Small deviations could be optimised by selective retouching.

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