Rehabilitation, repair, and maintenance of carbonated concrete members affected by corrosion of reinforcing steel by applying CP via a composite quantum anode

Damage to concrete due to corrosion of the steel reinforcement in carbonated concrete is a frequent issue if the affected structures are to be maintained. Conventional repair by applying fresh mortar for realkalisation implies changes in the weight and dimensions of the structure and is costly. Soft realkalisation of the steel/concrete interface by applying cathodic protection (CP) via a conductive coating – Composite Anode System - was used for the corrosion protection of carbonated concrete structures in a parking deck of the central TV administration in Vienna/Austria in several installations from 2003–2008. Five examples of the application of an improved system – the Composite Quantum Anode System, consisting of the QAP60 primer and the CAST Q paint– are presented: (1) the Slaughterhouse, an iconic building in the Antwerp (B) neighbourhood, transformed into a higher-education campus on a total of 1000 m 2 in 2021 to 2022, (2) in 2017, on the portal of the concrete structure on the roof of Pakhuys Afrika, Harbour of Amsterdam (NL) and the (3) on concrete panels of the Sint-Theodardus Church in Limburg (B), (4) 2023 on 3400 m 2 of carbonated concrete in a parking deck in Nürnberg (D), (5) in 2024, on 500 m 2 of the Bosc kiosk in Montpellier (F), built in 1927, the kiosk’s architecture is based on four octagonal posts.