Refurbishment of the concrete-glass windows of Aachen City Hall

Textile-reinforced concrete, an innovative composite material, creates new opportunities for the refurbishment of historic buildings. For example, particular filigree components, such as the historic concrete glass windows of the Aachen City Hall, would benefit from the corrosion-resistant carbon textile reinforcement. The 60 years old windows had to be repaired because of the corroded steel reinforcement and concrete spalling. Therefore, the glass pieces embedded in the concrete were separated and reinstalled in reconstructed concrete-glass windows. The steel reinforcement was replaced by carbon reinforcement. Thus, the historic monuments protection authorities' terms were respected while avoiding future corrosion damage.