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Reinforcement of historic ceilings in the German Optical Museum in Jena

How much of the existing structure can we preserve if we are brave enough to think outside the box? This question symbolizes the renovation of the German Optical Museum in Jena—an outstanding example of the use of sustainable technologies in construction. The focus is on reinforcing existing reinforced concrete ribbed ceilings with hollow brick infill using carbon concrete as part of the CARBOrefit® process.

Carbon concrete instead of complete renovation

Conventional methods of building preservation are increasingly reaching their limits – especially when it comes to requirements for monument protection, load-bearing capacity and resource conservation. In Jena, a different approach was deliberately chosen: instead of demolition and new construction, carbon-reinforced concrete is being used to sustainably upgrade the historic ceilings.

A carbon concrete layer just 10–15 mm thick is sufficient to significantly increase the load-bearing capacity and meet the increased payload requirements – without any intervention in the historic fabric.

Technical details

• Reinforcement of steel-reinforced concrete ribbed ceilings with hollow brick infill elements
• Application of the innovative CARBOrefit® process
• Carbon concrete layer only approx. 10–15 mm thick
• Preservation of the historic ceiling structure without complete replacement
• Increased load-bearing capacity while conserving resources
• Tested and certified execution by Karrié Bauunternehmung (Erfurt)